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Volume 65, Issue 4
Displaying 1-11 of 11 articles from this issue
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Yuri MURAKAMI2002 Volume 65 Issue 4 Pages 234-239
Published: August 25, 2002
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSEstimation of spectral reflectance from a set of sensor responses obtained through a set of spectral sensitivities can be modeled by an ill-conditioned inverse problem in vector space. This paper presents a theory of spectral reflectance estimation, including the Wiener estimation, with a central focus on a linear estimation. A nonlinear estimation method is also introduced.View full abstractDownload PDF (958K) -
Norimichi TSUMURA2002 Volume 65 Issue 4 Pages 240-244
Published: August 25, 2002
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSIn Japan, information technologies are expected to support elder people to improve their quality of life by providing medical information and managing their health information. Sensing the health information will be a key technology to achieve welfare society for elder people. In this paper, the real-time spectral imaging technique is introduced for monitoring pigmentations of human skin by inverse optical scattering method. The maps of melanin, oxy-hemoglobin and deoxy-hemoglobin densities in skin are converted from RGB image using three pre-computed color conversion look up tables. This system is applied to observe the changes in pigmentation during anaerobic exercise and occlusion. The human homeostasis by disturbance is observed in real-time with the developed system.View full abstractDownload PDF (2435K) -
Hideaki HANEISHI2002 Volume 65 Issue 4 Pages 245-250
Published: August 25, 2002
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDesign of color filters used in a multi-band imaging system for digital-archiving art painting is discussed. Optimum selection from commercially available dye filters and optimization of Gaussian-like spectral transmittance are performed. Calculation result indicates that the color difference less than one can be achieved with six, optimally designed or optimally selected filters.View full abstractDownload PDF (1634K) -
Masahiro YAMAGUCHI2002 Volume 65 Issue 4 Pages 251-257
Published: August 25, 2002
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESS“Natural Vision” is currently being studied for the purpose to allow natural color reproduction and highly realistic image display in visual communication systems. By introducing spectrum-based color reproduction scheme, it becomes possible to capture, transmit, store, and display high-fidelity color information, which has been difficult in trichromatic color imaging system. This article introduces fundamental technologies for natural vision, such as spectrum-based color reproduction system, multispectral image capture, and multiprimary display.View full abstractDownload PDF (3657K) -
Junichiro HAYASHI2002 Volume 65 Issue 4 Pages 258-263
Published: August 25, 2002
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSWe have developed the high accurate imaging system for digital archives. The system is consisted of image acquisition system used multiband CCD camera, and application software based on estimation of reflection spectra of the objects. In this paper, outline of the system, application system, and the application software is also introduced.View full abstractDownload PDF (5864K) -
Nobutoshi OJIMA2002 Volume 65 Issue 4 Pages 264-269
Published: August 25, 2002
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSStandard Object Color Spectral Database for Color Reproduction Evaluation (SOCS) was used to analyze the spectral reflectance of Asian skin color. It was found that spectral reflectance of bare skin was almost reproduced by three principal components, and that these principal components were different from those of cosmetic foundations. An experiment showed that the difference affected appearance and impression of facial skin color. Spectral information was also very useful in many applications such as emphasizing distribution of pigmentation, estimating the depth of pigmentation, and separating pigment components of skin.View full abstractDownload PDF (2710K) -
Satoru TOYOOKA2002 Volume 65 Issue 4 Pages 270-276
Published: August 25, 2002
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSIn multispectral image analysis, spectral characteristics of an image can be described by a few of basis vectors by principal component analysis. In this report, optical implementations of basis vectors as filters are proposed. Spectroscopic recognition of an image can be done by a few of monochromatic images taken by the synthesized filter system.View full abstractDownload PDF (3733K) -
Shoji TOMINAGA2002 Volume 65 Issue 4 Pages 277-283
Published: August 25, 2002
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSA method is introduced for acquiring the spectral image of a three-dimensional object by means of a multi-channel camera and estimating various reflection parameters of the object surface. It is assumed that the surface material is nonmetallic inhomogeneous dielectric. The Torrance-Sparrow model is used as a 3D light reflection model for describing the reflection properties. The camera system is a six-color camera, composed of a monochrome CCD camera, six color filters, and a personal computer. Next, we describe algorithms for estimating the reflection parameters from a single spectral image. The parameters estimated are both spectral functions of surface-spectral reflectance and illuminant spectral distribution, the coefficient of body-to-interface ratio, and the geometric parameter of surface roughness. Finally, experiment results are shown using a paint object. The feasibility of the method is confirmed, and the estimated model parameters are used for creating realistic computer graphics images.View full abstractDownload PDF (2156K) -
Yoshitsugu MANABE2002 Volume 65 Issue 4 Pages 284-290
Published: August 25, 2002
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSColor and shape are the most important information in object recognition. RGB-color camera is the usual color measurement tool, but it hardly presents the natural color of the targets because a real image is a projection of complex optical phenomena described with spectral distribution. This paper explains the measurement methods of 3D shape and spectral image, and refers about its applications.View full abstractDownload PDF (4558K) -
Masashi IWASAKI, Katsuki TAI, Masami OKAMOTO2002 Volume 65 Issue 4 Pages 291-294
Published: August 25, 2002
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSAssociation of cationic and anionic quinocyanine dyes was studied by applying high pressure to the dye solutions. On applying the pressure up to 600 MPa, the absorption spectra of various dye solutions were measured. The spectra varied intensively with pressure increasing. This was interpreted in terms of the association of dye induced by pressure. The physical properties of dyes are discussed.View full abstractDownload PDF (1477K) -
Tadaaki TANI2002 Volume 65 Issue 4 Pages 295-296
Published: August 25, 2002
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDownload PDF (1113K)
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