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Volume 66, Issue 5
Displaying 1-11 of 11 articles from this issue
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Masaya TAMARU, Masahiko SUGIMOTO, Koji ICHIKAWA, Kazuhiko TAKEMURA2003 Volume 66 Issue 5 Pages 447-451
Published: October 25, 2003
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSTo realize good total image quality for digital still cameras, it is important to achieve coexistence of higher resolution and lower noise level. In this research we develop the noise simulation model based on the noise properties of actualdigital still cameras. Psychophysical experiments are conducted by using a series of simulated images which have different resolutions and noise levels. Contribution of resolution and noise level to total picture quality are discussed by analyzing the experimental results.View full abstractDownload PDF (2271K) -
Takao ABE2003 Volume 66 Issue 5 Pages 452-457
Published: October 25, 2003
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDigital printers are now common place for printing color images. Among the many kinds of digital printing methods, ink jet and thermal dye transfer methods produce high-quality results, similar to those of silver halide photographs. As these two digital methods improve their image stability performance, they will continue to gain market share currently enjoyed by silver halide photographs. This paper describes the present state of digital printing technologies and discusses the expanding market for digital color pictures.View full abstractDownload PDF (2671K) -
Jun YAMASHITA, Hisato SEKINE, Toshiya NAKAGUCHI, Norimichi TSUMURA, Yo ...2003 Volume 66 Issue 5 Pages 458-463
Published: October 25, 2003
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSWe propose a new model to predict the color reproduction of digital halftone image based on the physical model of dot gain. In the previous papers, we reported that the transparency image of halftone is not influenced by optical dot gain. On the basis of this experimental result, in this paper we analyze the optical and mechanical dot gain separately by using the optical microscopes which can take the transparency and reflectance images of the same area. Transparency images of an ink dot are taken with an optical microscope with a six-band camera and the spectral transmittance of each pixel in an ink dot is estimated by the multiple regression estimation method. This obtained spectral transmittance is converted into the amount of cyan, magenta, and yellow (c, m, y) inks in each pixel. Then we can estimate the shape of ink dot by polynomial fitting of ink amount. The transmittance of c, m, y inks of printed images is estimated by using the proposed method and compared with that of practical printed images. This results show that the proposed method is significant to predict the density of ink-jet images.View full abstractDownload PDF (2573K) -
Hiroshi WATANABE, Hideyuki KOBAYASHI, Kaori FUKUMURO2003 Volume 66 Issue 5 Pages 464-466
Published: October 25, 2003
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSThe latest spread of digital still cameras (DSC) produces needs of digital image printing. Thermaldye transfer system is utilized for this use from the smooth gradation characteristic. We report the design of the new developmentof a thermal dye transfer system which was able to give the new vivid color characteristic, and technology taking advantage of the feature of the post chelate technology which raised the image stability which was a thermal dye transfer system.View full abstractDownload PDF (432K) -
Itaru FUKUSHIMA2003 Volume 66 Issue 5 Pages 467-470
Published: October 25, 2003
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSThe recently progress of digital imaging is very noteworthy. From long ago the printing method by using thermal head is adopted mainly history heating control. But the degree of printing accuracy of the method was low-level tone reproduction. Because, this historical control is a just speculate method. Now we developed new printing method by using temperature measuring parts and detecting its heat energy. This may be first case in the world that we can know the energy of heating element just during printing. And by feedback control we can control adding heating energy. This method will be able to development for new printing material too.View full abstractDownload PDF (1366K) -
Yoichi KASHIBUCHI, Naokazu AOKI, Masao INUI, Hiroyuki KOBAYASHI2003 Volume 66 Issue 5 Pages 471-480
Published: October 25, 2003
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSNoise was added to digital print to improve description of subject. Changing level of noise, type of images, and area, where noise is given, samples were made and subjectively evaluated. Under some conditions addition of noise resulted in increase of scores of preference. By using the Mahalanobis-distance it was not achieved to estimate optimum noise levelfor an object, but it was realized to distinguish pictures which are improved from ones which become worse by adding noise.View full abstractDownload PDF (2287K) -
Yoriko IKEHATA, Yuki ISOHATA, Shigeru MANO2003 Volume 66 Issue 5 Pages 481-483
Published: October 25, 2003
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSNew study of forced testing conditions for light stability of digital out-put color materials was performed on influence of relative humidity. It was found that some materials showed large different light stability among 40%RH, 60%RH and 70%RH. It is recommended that the forced test be done under low and high relative humidity conditions.View full abstractDownload PDF (382K) -
Hiroshi FUJITA2003 Volume 66 Issue 5 Pages 484-490
Published: October 25, 2003
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDevelopments of “computer-aided diagnosis (CAD)” systems have been conducted, as one of additionalvalues for digital images, under the situation where the utilization of digital images is substantially being in progress in medicine. The CAD systems are now commercially available in the fields of breast (mammography) and chest x-ray images, and itis not hard to say that the CAD systems for many imaging modalities and in the field of many different lesions will be developed and commercialized. In this review, the background of the CAD developments, its current status and the latest information on the techniques are described. In addition, the potential of CAD for the future is discussed and predicted.View full abstractDownload PDF (5469K) -
Hiromi AKAHORI, Kiyokazu MORITA, Ayumu NISHIJIMA, Tsuyoshi MITSUHASHI, ...2003 Volume 66 Issue 5 Pages 491-496
Published: October 25, 2003
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSBisphenol derivatives are efficient developers in silver salt photothermographic systems. To investigate the effects of intramolecular hydrogen bonding on the electron transfer properties of bisphenol derivatives and, in turn, on the developing properties of these derivatives in such systems, the electron transfer properties of a series of bisphenol derivatives were examined in comparison with those of monophenol derivatives in which a hydroxy group was replaced by a methoxy group. The electron spin resonance (ESR) spectra of phenoxyl radicals derived from bisphenol derivatives indicate formation of an intramolecular hydrogen bond between the oxygen and the hydroxy group of phenoxyl radicals. This intramolecular hydrogen bonding plays an important role in determining the overall oxidation reactivity in the two-electron oxidation process by decreasing the one-electron oxidation potentialView full abstractDownload PDF (1026K) -
Akimi MORI2003 Volume 66 Issue 5 Pages 497-500
Published: October 25, 2003
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSNew NHK archives started its service on February 1, 2003. It has 8 stories with storage space for 1.8 million videotapes. The Archives system consists of “Comprehensive database”, “Large Scale Video Server”, “Video Storage System”, “Transmission System” and “Open Library”View full abstractDownload PDF (2116K) -
Kenichi KUGE, Tomozumi TAKAGI, Tadayuki SHINOZAWA, Shizu KAWAMATA, Hir ...2003 Volume 66 Issue 5 Pages 501-508
Published: October 25, 2003
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDistribution of the numbers of latent image specks per one emulsion grain was obtained for sulfur+gold-sensitized octahedral (Oct) and cubic grain (Cub) emulsions exposed to light or β-radiation. In the case of light exposure both emulsions showed shift into the Poisson distribution at the highest sensitization level. The number of latent image specks formed by one strike of high energy particle, z, was estimated through stochastic analysis. The value of z suggested more quantitatively that the degree of dispersion for the sulfur+gold-sensitized Oct emulsion was higher than that of Cub one. It was considered that the dispersion of latent image specks reflected not the competition of electron-trapping in the nucleation process between electron traps including sensitization centers but the competitionin the growth step between Ag2 specks. Microwave photoconductivity was also measured to compare the effects of sulfur+goldsensitization on the dispersion of latent image specks and on the photoconductivity measurement. It was concluded that the former reflected the growth process, and the latter reflected the nucleation process.View full abstractDownload PDF (1391K)
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