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Toshiyuki Toshito
2007 Volume 70 Issue Suppliment Pages
2-3
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Basic studies on the application of emulsion technology to study the fragmentation processes of therapeutic carbon beams have been carried out. The OPERA-film and the automatic high-speed emulsion readout system are used as core devises. The R & D to identify electric charge of fragments up to six was demonstrated. Also we have studied charged nuclear fragments produced by 200-400 MeV/n carbon ions interacting with tissue equivalent material of water.
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Takashi Kobayashi
2007 Volume 70 Issue Suppliment Pages
4-5
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Elementary work for gelling characteristics of gelatin is presented in this paper. The contents are (1) summary of my study for the past several years (1988-4996), (2) a general review of many studies of gelation and sol-gel transformation of gelatin in this society. I consider that the gelatin is continuously proposing attractive themes from now on in many applications.
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Y. Okawa, Y. Imazeki, F. Shiba
2007 Volume 70 Issue Suppliment Pages
6-7
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Properties of dry films composed of gelatin and κ-carrageenan were examined. Optical rotation of the blend film changed approximately linearly with the blend composition, suggesting that both polymers form independently their characteristic high-order structures (helices) in the film without strong interaction between them. This is consistent with our microphase separation model to the blend gel. Swelling behavior of the blend films varied with the film composition and the pH of the swelling solution. We discuss the pH dependence of the swelling ratio from the electric charges of the polymers and found that the electrostatic interaction between the gelatin domain and the carrageenan domain is of importance to the deformation by the swelling.
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Ataru Takeda, Ken'ichi Kuge, Tomoko Sakai, Akira Hasegawa
2007 Volume 70 Issue Suppliment Pages
8-9
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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A gold-layer photograph using silver halide photosensitive materials is provided by the gold deposition developing method and the burning after the development. This image has high resolution and durability. It can make a hologram with thin grating composed of gold layer. In this study, we investigated the baking condition that was suitable for making a gold-layer hologram. Suitable gold-layer holograms were obtained by baking at low temperature-raising rate and at high temperature. When the temperature-raising rate was changed at 400°C, there were more suitable conditions that the luster of gold metal and the diffraction efficiency increased.
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Y. Nakano, S. Kasai, T. Yanagita, S. Honda
2007 Volume 70 Issue Suppliment Pages
10-11
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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The imaging plates (scintillator) for computed radiography (CR) have been developed. The imaging plates coated with BaFI phosphers have been installed in many CR systems as the products in the market all over the world. A new imaging plate with vapor-deposited CsBr phosphor was developed. It has an advantage of needle crystalline structure and it enables CR to improve the image quality drastically. X-ray diagnosis market is spreading with these two types of versatile imaging plates.
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Toshioh Fujibuchi, [in Japanese], [in Japanese], [in Japanese], [in Ja ...
2007 Volume 70 Issue Suppliment Pages
12-13
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Film dose distribution method is used for the profile measurement of non-physics wedge. This time, after a beam was irradiated for not the film but the Imaging Plate (IP), light fading was done, and we measured the Off center ratio (OCR) of non-physics wedge. And it was compared with the OCR measured with ionization chamber (IC) dosimeter. It was possible that it was made to approximate measured value by IC dosimeter consequently by using a metal filter. This method can be thought to be available as simple and easy quality assurance of non-physics wedge in consideration of the character of the IP.
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Chihiro Matsuguma, Suguru Ushiki, Takeshi Koishi, Toshiya Nakaguchi, N ...
2007 Volume 70 Issue Suppliment Pages
14-15
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Medical training systems based on virtual-reality techniques for laparoscopic surgery have been widely applied as new medical training systems. In the previous paper, we proposed the deformation model based on the beam of structural mechanics and applied this model to the simulation of the liver deformation. In this model, its calculation cost is much less than that of the 3D FEM, since the beam deformation is calculated as one-dimensional elements. However this beam deformation model is based on one point-contact. In this paper, we propose expanded beam model based on two point-contacts for laparoscopic training system.
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Hiroshi Shimura, Hideki Hayashi, Yoshikazu Yonemitu, Tomonori Katou, H ...
2007 Volume 70 Issue Suppliment Pages
16-17
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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We have previously developed a method that combines a mini gamma camera with an optical camera to synthesize the two kinds of images and help surgeons to easily identify sentinel lymph nodes on the gastric surface in the cancer resection surgery. In this paper, we apply this method to small animal imaging. We present an experimental result with a rat and point out that the previous method assuming that the target surface is approximated by a flat plane must be modified and suggest the necessity of shape reconstruction by stereo camera. A preliminary experimental result of shape reconstruction is also presented.
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Yuko Shinden, Hiromu Ohara, Chika Honda
2007 Volume 70 Issue Suppliment Pages
18-19
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Recently phase contrast X-ray imaging has been studied using practical x-ray tubes for medical use. To obtain the edge enhancement by phase contrast, the geometrical unsharpness caused by blurring due to penumbra should be controlled. In this study, we would like to describe the radiographic condition in high magnification imaging.
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[in Japanese]
2007 Volume 70 Issue Suppliment Pages
20-21
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Computed Radiography (CR) is the first practical digital radiography that was uses photostimulable phosphor (storage phosphor). This report shows outlines of CR system nd recent technical progress.
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Y. Nakano
2007 Volume 70 Issue Suppliment Pages
22-23
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Various phosphor materials have been developed to realize high sensitivity for converting x-ray as scintillators. There are some important points for scintillator development, such as x-ray absorption, improvement of luminescence properties, and durability for humidity. The scintillators which have high sensitivity improve image quality for diagnosis and decrease x-ray dosage. This report focuses on the development of the imaging plate (scintillator) for CR (computed radiography), and summarizes scintillator technologies.
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Tatsuya Yamazaki
2007 Volume 70 Issue Suppliment Pages
24-25
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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The flat-panel detectors (FPDs) are replacing conventional diagnostic x-ray imaging detectors. The indirect FPD consist of a scintillator and an amorphous silicon TFT-array has many advantages over other detectors such as direct FPD and CR (computed radiography). Amongst of all, the indirect FPD having more than twice DQE (detective quantum efficiency) can obtain equivalent image quality with much less dose than other detectors.
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Yukio Mishina
2007 Volume 70 Issue Suppliment Pages
26-27
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Since Shimadzu has developed Digital Radiographic System with FPD, so called Shimadzu-Safire series in 2003, we have been developed various clinical application techniques utilizing the superior advantages of FPD. FPD basically has advantages of high spatial resolution, high dynamic range, no geometrical distortion, etc. which any previous X-ray sensors could not have. These advantages have made it possible to develop clinical application techniques which have been impossible to be developed in the past. In this paper, we will describe the current status of our development on clinical application techniques.
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Yoko Nakanishi, Tomoko Katayama, Kazuki Funahashi, Ari Ide, Takashi Ka ...
2007 Volume 70 Issue Suppliment Pages
28-29
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Digital archiving of graphic art works can significantly contribute to the conservation of these cultural heritage items. Assessment and analyses of the pigments give a promising tool to the artists who work on different aspects of these art pieces such as restoration, and researchers on their history, and provenance. The two main features of the new system are the extremely high resolution, and the capability to determine the original material used non-destructively. Most pigments used in Asian painting and artworks are of mineral origin.
Adapting these techniques to pigment identification is an important innovation in the proposed system. A systematic study of known pigments, raw materials (e. g. Washi) from different periods in history will be conducted to provide a database to be used in the assessment work. Here, we will briefly discuss the methods of calculation for estimation of the compositional and spectroscopic characteristics of the ancient Japanese arts. The proposed system will be a unique analytical instrument that will contribute immeasurably to the appreciation and conservation of cultural heritage.
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Atsuo Ida
2007 Volume 70 Issue Suppliment Pages
30-31
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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HAMON is the design of the tempered edge of the Japanese sword blade. HAMON is the most important factor to represent the sword's beauty and prove that the sword has excellent quality. However, HAMON cannot be taken by standard photography. Generally, HAMON picture is copied by hand drawing. Mr. Okisato Fujishiro is a sword polisher as well as a HAMON photographer. He has been taking HAMON pictures by hand drawing or his own method of HAMON photography. He requested us to develop “HAMON SCANNER” to represent sharper HAMON images. “HAMON SCANNER” was developed based on our image processing technology and added lighting technology. This paper presents the scanner technology which can take high definition HAMON images.
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Yukio OKANO, Masaya OITA, Yutaka TAKAHASHI, Yasuo MASAKI
2007 Volume 70 Issue Suppliment Pages
32-33
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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The RAW image files of color digital cameras are produced by direct analog to digital converting from the Bayer filtered imaging devices. The Bayer-RAW images are not affected by the image processing of the camera system, so the MTF of optical system can calculate from Bayer-RAW images. The green-MTF of an optical system for digital still camera which output the RAW images are calculated from slanted black/white edges which are interpolated by 1-dimensional filter. The optical MTF for white light are also calculated.
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Takayuki Hayashi
2007 Volume 70 Issue Suppliment Pages
34-35
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Technological progress has brought with it photographic equipment that is ever smaller and lighter, and as such, opportunities for handheld shooting have increased. We began research on image stabilization technology in 1981.
We made the world's first video camera equipped with an optical image stabilizer (OIS) a practical, item in 1988.
With these developments, we produced the world's first compact digital still camera equipped with an image stabilizer in 2003, realizing a compact, slim, user-friendly and highly practical DSC with an image stabilizer.
As a result, it became possible even for a beginner to take blur-free, high quality shots easily, which has contributed significantly to the development of our advanced information society's culture of the image.
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Makoto Murakoshi, Tomotoshi Iitani
2007 Volume 70 Issue Suppliment Pages
36-37
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Shooting videos using 8mm movie films is a vanishing habit altered by current electronic devices with the latest technology. However, our DVD conversion services revive those videos and make them enjoy viewing on TV screen in house. These services respond people's desire to see those films while projectors are not available any more. This conversion service offers not only to enhance color and picture quality, but also to provide easy-to-use, convenient media for users.
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Akito Enokuchi, Yoshitaka Suzuki, Mitsuhito Komatsu
2007 Volume 70 Issue Suppliment Pages
38-39
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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This paper presents our design concepts of our original extensible-boom-based optics on a 5kg satellite “PRISM” which stands for “Pico-satellite for Remote-sensing and Innovative Space Missions”. The boom has been designed especially for a telescope, so it is very different from any conventional structure. The handheld satellite will be the first test bed of the extensible boom and will obtain Earth images with 30 meter resolution or better when this boom works well in orbit, with its compact spacecraft bus, which is 18cm×18cm×40cm body. The satellite will be launched 2008.
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[in Japanese]
2007 Volume 70 Issue Suppliment Pages
40-41
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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WEB Cam and some planetary software make it possible to acquire the earth based high-resolution planetary image. The process has following steps;(1) capture a lot of frame images, (2) select appropriate images, (3) stuck images, (4) wavelet processing.
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Haruki Kamiyama
2007 Volume 70 Issue Suppliment Pages
42-43
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Whenever processing images of weak light, such as astronomical objects and electron microscopes, important information tends to be concentrated in a very narrow tonal range. However, a wide range could be represented at the same time to capture the object as a whole. We have developed a system which can solve these conflicting problems through keeping each pixel's tone to a high precision. Here we present cases on performing a high precision process in every stage, i. e. sampling rate, formating, and processing system.
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YASUNORI ICHIKAWA
2007 Volume 70 Issue Suppliment Pages
44-45
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Mitsutoshi Okano
2007 Volume 70 Issue Suppliment Pages
46-47
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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The author's works concerning σ-conjugated polymers are summarized. Electrochemical syntheses of polysilanes, polygermanes, and polystannanes with linear and network structures are discussed. Copolymerization of two monomers and application of copolymerization techniques to prepare cross-linked polymers are also discussed.
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Hiroaki Iino, Jun-ichi Hanna
2007 Volume 70 Issue Suppliment Pages
48-49
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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We have investigated charge carrier transport properties in liquid crystalline materials. In highly ordered liquid crystal phases such as smectic and discotic columnar phases, the intrinsic charge carrier transport is electronic and ambipolar: in fact, we observed the ambipolar electronic conduction in the liquid crystal phase of phthalocyanine derivative (8H
2Pc) as well, which is considered to be a typical p-type material. In this material, hole and electron mobility are 0.2 and 0.3cm
2/Vs, respectively. We also demonstrated that liquid crystals are promising for preparing quality polycrystalline thin films, in which few grain boundaries run across conduction channels. Thus, we conclude that the liquid crystals are a good candidate for high quality organic semiconductor materials.
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Mitsuo Kawasaki, Ritsu Tsubaki, Masahiro Kawasaki
2007 Volume 70 Issue Suppliment Pages
50-51
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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A DC-sputtered Ag film grown on glass while exposed to controlled, concurrent, ion bombardment exhibited strong light scattering, as attributed to its characteristic surface plasmon excitation. A novel trilayer structure consisting of this moderately roughened, nano-textured, Ag film as the bottom reflecting layer, an intermediate transparent layer, and an thin light absorber layer (spin-coated RhB) on top, allowed us to achieve more than 10-fold light absorption enhancement, as compared to the control absorber layer placed on glass substrate. The large enhancement can be traced back in part to the constructive interference between the incoming and the plasmon-scattered light (i. e., enhanced electromagnetic field) in the absorber layer and also to effective confinement of some considerable fraction of the incoming light by the unique trilayer devise developed in this study.
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Mitsuo Kawasaki, Tomohiro Fukuura, Masahiro Kawasaki
2007 Volume 70 Issue Suppliment Pages
52-53
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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The pulse-laser pumped emission from a dye-doped polymer film, as it is coated on a thick Ag-island film of large pseudotabular nanoparticles, is strongly affected by the metal-enhanced fluorescence very near the Ag-island, so as to produce an avalanche of stimulated emission with a bandwidth as small as 2.5nm. A modified system with a gain region laterally extended outside the Ag-island film gave rise to an even narrower emission from the film edges, down to 1.5nm in bandwidth. Furthermore, it was found that mixing of several different laser dyes in the polymer film, with significant overlaps of the fluorescence and absorption spectra, caused still stronger and narrower emission, sometimes 0.65nm in bandwidth, at some controlled positions in the visible region, while the excitation (pump) wavelength was fixed at e.g., 532nm.
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Hideaki KUBOTA, Mizuki KATAGIRI
2007 Volume 70 Issue Suppliment Pages
54-55
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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For image denoising by wavelet shrinkage, an optimal threshold selection is required. Although Donoho's universal threshold gives the optimal threshold theoretically, the information of noise power on the image is needed. In this study, we propose a simple and robust method for the threshold selection. We use the histogram shape of absolute value of wavelet coefficients. Medical chest x-ray digital image of various signal-to-noise ratios (SNR) were chosen for testing our threshold selection. For the noised image of a low SNR, the almost same performance as the Donoho's threshold was shown. Furthermore, the threshold value which we proposed was stable over the wide range SNR.
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Yusuke Urakawa, [in Japanese]
2007 Volume 70 Issue Suppliment Pages
56-57
Published: May 24, 2007
Released on J-STAGE: August 04, 2011
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When we watch works of art, features such as grave tone, balance of shape, and stability attract a great deal of our attention. In this study we have noticed features of characters and scripts and analyzed them with Fourier transform.
We have been able to bring some features of characters and scripts from power spectrum analysis.
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K. Ishii, N. Aoki, H. Kobayashi
2007 Volume 70 Issue Suppliment Pages
58-59
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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In research concerning memory color of flesh color, it is almost always necessary to obtain a representative value of flesh color of face, which has area. In the preceding study, Through a color matching in which the flesh color of an image of the samples possessing flesh color consist of only one hue angle was matched to that of the sample by changing hue angle, parts determining the hue angle were obtained with results that the determining part differs from one sample to another and that hue angle of the part was lower (more reddish) than that of the mean value of whole face. In the present study a similar color matching test was performed samples possessing flesh color consist of only one lightness.
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Daisuke Sato, Mari Yamamoto, Naokazu Aoki, Hiroyuki Kobayashi
2007 Volume 70 Issue Suppliment Pages
60-61
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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In this study, a new arranging method of test pictures for subjective evaluationwas supposed. Several tens card-sized pictures were arranged on a sheet, increasing a from left to right, increasing b from bottom to top, increasing L from higher right to lower left, and increasing C in the opposite direction. Comparison with other arrangement methods proved usefulness of this method.
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Kunitoshi Yabe, Takehito Kurihara, Naokazu Aoki, Hiroyuki Kobayashi
2007 Volume 70 Issue Suppliment Pages
62-63
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Photographers have practiced adding noise (grain) to digital images as a means of image quality improvement. In our previous study, we have analyzed how a professional photographer adds noise to an image. We found amount and histogram shape of the noise depend on the pixel value of a pixel to which the noise is added. In this study, we examined the noise of B & W silver halide photographic systemandfound it has such dependency in common with that by the professional. We thinkthese might be one of the requirements for “good” noise.
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S. Sato, H. Komori, H. Kobayashi
2007 Volume 70 Issue Suppliment Pages
64-65
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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In this research, we investigated the effect of image quality on the speculationof personality by portrait photography. The personalities of a person on the photography with different image quality were evaluated by semantic differential method. From this experiment, we extracted three factors, which act on the personality cognition, and found that image quality influenced on the impression formation by portrait photography.
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S. Sato, H. Shimizu, H. Komori, N. Aoki, H. Kobayashi
2007 Volume 70 Issue Suppliment Pages
66-67
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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With color photos we feel aged from lower color temperature, lower chroma, and faded color. But black-and-white and sepia-toned photos make us feel more aged than any color photos. Here kansei effect of sepia-toned photo is discussed compared with black-and-white photo.
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D. Otani, N. Aoki, H. Kobayashi
2007 Volume 70 Issue Suppliment Pages
68-69
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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The painting is not what reproduces the object correctly, unlike the photograph, but it gives us a special beauty. In this paper, the techniques to express flesh color of some famous painters like Renoir and Vermeer were analyzed and applied to inkjet prints.
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H. Shimizu, H. Kobayashi, N. Aoki
2007 Volume 70 Issue Suppliment Pages
70-71
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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A system to produce pen drawings (area modulation) from pictures of which tone is expressed by density modulation was constructed. Employing hand drawn lines resulted in impression of hand drawn image.
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S. Atarashi, N. Aoki, H. Kobayashi
2007 Volume 70 Issue Suppliment Pages
72-73
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Image qualities of 8-millimeter films including noise, tone, and color were analyzed. A filter for application of the physical properties of 8-millimeter films was constructed to change digital video images into images on 8-millimeter films.
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Halvor Bjerngaard, Hiroyuki Kobayashi
2007 Volume 70 Issue Suppliment Pages
74-75
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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We present two alternative methods for making “gum prints” with gelatine or gum arabicum. These are based on free radical polymerization with ammonium ferric citrate as sensitizer. The gelatine-based process is simple, using hydrogen peroxide as developer, the gum-based process includes ammonium persulphate in the photosensitive layer and has therefore problems with a “darkreaction”. Our process also avoids hardening of the substrate, by a modified work path.
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Ryuji Shiraishi, Katsumi Yamada
2007 Volume 70 Issue Suppliment Pages
76-77
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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We have a great interest in the application of nano-rod membrane as the working electrode for electrochromic device. In order to obtain a white reflector for an EC device, the zinc oxide submicron-rod membrane was prepared by the template method with aqueous solution. And, the photo-electric characteristics of the zinc oxide submicron-rod membrane were evaluated by the spectrum photometer and 2-terminal method.
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Fumiyuki SHIBA, Yusuke OKAWA
2007 Volume 70 Issue Suppliment Pages
78-79
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Electrochromic (EC) films were prepared on ITO transparent electrodes with a paste containing tungsten oxide nanoparticles. Electrochemical measurements coupled with spectroscopy were applied to evaluate the EC properties in a 0.1mol dm
-3 HCl aqueous solution. The WO
3 EC film obtained in the present study showed clear color alternation with electrochemical redox reaction, as similar as evaporated films.
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T. Yamaguchi, N. Oshiba, F. Shiba, Y. Okawa
2007 Volume 70 Issue Suppliment Pages
80-81
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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The detection of deterioration of photographic gelatin binders was examined from HPLC analysis of the sol fraction extracted into cold water from model gelatin films (alum-hardened, and non-hardened), RC paper, and baryta paper. It is confirmed that decomposed gelatins having relatively low molecular weight (-10
4 Da or lower) was extracted and detected from all of the films after the accelerated ageing process. The detected amount increased with increasing the ageing time. We concluded that this technique is useful for the evaluation of degradation of gelatin binders.
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TADAO INOUE
2007 Volume 70 Issue Suppliment Pages
84-85
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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This paper reviews the history and activity of the Society for Archaeological Photography and describes various problems of the photography for cultural property.
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HIDEAKI SUGIURA
2007 Volume 70 Issue Suppliment Pages
86-87
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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The gloomy environment which surrounds film photo, especially monochromatic film, makes me pessimistic. The Society conducted the detection investigation of silver halide and fixative hypo, which remain into the monochromatic film, photoed the cultural property for the several decades. The number of the institution which investigated is 10% of the Society membership. I want to consider as the key of the technology of saving a photograph over a long period of time.
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Ichiro Nakamura
2007 Volume 70 Issue Suppliment Pages
88-89
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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A silversalt photograph with the results has been used for a photorecording of the deposit cultural assets which a member of “The society for Archeological photography” was concerned with about a long-term save conventionally. The processing that photograph processing entrusts you with the outside is the mainstream. I started activity a fall of quality became a problem, and to grope for a long-term save by a digital record.
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Norihiko Matsumoto
2007 Volume 70 Issue Suppliment Pages
90-91
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Since its invention, photography has been taking important roles in history as the medium of document, communication and expression. Enormous number of photographs has been produced with deeply concerning the society, art, culture and science. In Japan, innumerable negatives of such important photographs, especially taken in the high-growth period after the Second World War, are threatened to be scattered and lost, as a result of aging and decease of the photographers.
The concept of the Photo Archives of Japan is to collect and preserve those negatives, to make digital data and a database of the negatives for practical use. In the initial stage, it is planned to collect the negatives taken and published in the printed media between 1945 and 1970. The Photo Archives of Japan (a tentative name), it is to be desirable that such archives should be operated by an independent organization supported by the government as well as private societies.
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Naoya Katoh
2007 Volume 70 Issue Suppliment Pages
92-93
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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The extended-gamut color space: xvYCC was standardized at IEC in Jan. 2006. The background of the standardization and its technical contents are briefly explained in this paper. xvYCC's gamut covers most of the surface colors, and its gamut size is twice as large as sRGB's. With xvYCC color space, users will be able to enjoy wider color reproduction and more truthful detail reproductions.
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Toru Kitano, [in Japanese], [in Japanese], [in Japanese], [in Japanese ...
2007 Volume 70 Issue Suppliment Pages
94-95
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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Color gamut of image displays has become wider. If the reproduced color is in a high chroma, it looks to be vivid and preffered. However, when the reproduced color is in an extremely high chroma, it looks to be unnaturally.
In this study, we have carried out subjective evaluation to examine the preferred color reproduction of the images of plants, sky and flowers, using a LCD with AdobeRGB color. It is found that almost all image samples have preferred color in the area of inside and outside of sRGB color. Especially preferred color of sky blue has been distributed in a high chroma area.
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Akiko Okawa, Masayuki Ukishima, Norimichi Tsumura, Toshiya Nakaguchi, ...
2007 Volume 70 Issue Suppliment Pages
96-97
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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A method is proposed to measure the spectral modulation transfer function (MTF) of color displays. The spectral MTF is defined as the absolute value of Fourier transform of the spectral line spread function (LSF) on displays. In order to obtain the spectral LSF, we measure the spectral radiance distribution of a displayed single line of various colors. The measurement system is constructed with a charge coupled device (CCD) and three band-pass filters. Three-bands CCD values can be transformed to 81-bands spectral radiance using the transformation matrix generated by multiple linear regression analysis. Using our proposed method, we measured the spectral MTFs of a color liquid crystal display (LCD). The MTF characteristics of the LCD were measured as device-independent value.
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Maki Yokoyama, Takahiro Takiguchi, Keiichi Ochiai, Norimichi Tsumura, ...
2007 Volume 70 Issue Suppliment Pages
98-99
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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In this paper, we evaluate the accuracy of estimation for normal vectors in a flat-bed scanning system that we have proposed previously for recording the spectral and glossiness information of various sheets (Abe et al., 2006). First, based on a computer simulation, we evaluated the accuracy of estimation for the normal vector, roughness and specular reflectance parameters in increasing the number of the light sources. Secondly, we performed experiments using a real object, and reproduced the object using the estimated parameters under arbitrary illuminant.
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Soh Chih Jen, Daisuke Kawazoe, Norimichi Tsumura, Toshiya Nakaguchi, Y ...
2007 Volume 70 Issue Suppliment Pages
100-101
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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In this research, we present a system framework to construct a facial digital phantom which considers the spatially varying subsurface scattering characteristics of human skin using a new hybrid method which combines both image-based and model-based methods. Images of a subject's face is captured using a digital camera and based on these images, the 3D model of the face is acquired. The spatially varying subsurface scattering parameters of skin pigments, melanin and hemoglobin, are estimated from an image and using these data, the facial digital phantom is constructed.
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Hayato Kinoshita, Takao Makino, Norimichi Tsumura, Toshiya Nakaguchi, ...
2007 Volume 70 Issue Suppliment Pages
102-103
Published: May 24, 2007
Released on J-STAGE: February 17, 2011
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In this paper, we present a virtual mirror system tracking a 3D position and orientation of a user's head in real-time. This system can exhibit a high-realistic color change of the human face. The “virtual mirror” is a system that can reproduce a mirror image of user's face onto the display by using a video camera and a half mirror. Unlike a normal mirror, virtual mirror has an advantage that various image processing can be performed to the video stream. Therefore, it is thought that the virtual mirror can be applied to various applications, for example, video chatting and electronic cosmetic and so on. Our goal is to create the electronic cosmetic system with the virtual mirror. The 3D head position and orientation are tracked to control the skin color on appropriate position in the face.
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