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Volume 28 (1991)
- Issue 6 Pages 414-
- Issue 5 Pages 310-
- Issue 4 Pages 252-
- Issue 3 Pages 184-
- Issue 2 Pages 98-
- Issue 1 Pages 2-
Volume 28, Issue 3
Displaying 1-7 of 7 articles from this issue
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Keiji UCHIKAWA1991 Volume 28 Issue 3 Pages 184-191
Published: May 31, 1991
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSPrinciples of the present color systems are briefly described and their limitations are discussed. Since one of the most significant limitation is that color appearance cannot be represented by these color systems, factors influencing color appearance are mentioned and variations of color apearance by these factors are described in order to show how and in what degree colors change. Modes of color appearance has been recently considered as an important factor caused by a higher level of the visual system. Therefore, its effects on color appearance is shown using the results obtained in an categorical color-naming experiment.View full abstractDownload PDF (2044K) -
Yoshiaki WATABE1991 Volume 28 Issue 3 Pages 192-199
Published: May 31, 1991
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSColor densitometers are widely used in printing, plate-making, color printers, copiers, photosensitive material industry and so forth. Concerned with these application, definition of density, geometrical design of measuring instruments and kinds of color density, further-more for examining exactly evaluation of measured data, ways of inproving the data-convertibility in each instruments, as the subject in measuring color density, detecting capacity for yellow color density, characteristic of the standard gray scale, of the dot-density and their relationship with spectrophotometers have been described.View full abstractDownload PDF (1730K) -
Hiroshi YAMASHITA1991 Volume 28 Issue 3 Pages 200-214
Published: May 31, 1991
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSSince the introduction of ultra-violet radiation (UV) curable coatings as a viable industrial process well over a decade ago, the UV curing industry has followed a line of steady growth. This article is mainly concerned with an overview of the present status for the UV curable coatings mainly based on acrylate systems. The property-structure relationship which characterizes UV curable coatings and oxygen-inhibition in freeradical photoinitiated polymerization will be discussed from the recent and relevant results of the literature. In addition, recent topics in applications will be briefly mentioned.View full abstractDownload PDF (1553K) -
Zhong ZHENG, Masayuki NAKAJIMA, Takeshi AGUI1991 Volume 28 Issue 3 Pages 215-224
Published: May 31, 1991
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSProgressive build-up ADCT (Adaptive Discrete Cosine Transform) can be widely used in image transmission and storage as an efficient image coding method. The progressive build-up ADCT codes an image in several stages. At the first stage, it codes a low resolution image. At each later stage, it codes the error image, i.e. the gray level error caused by coding, and the quality of the reconstructed image is improved by the error image. The value of each pixel of the error image, however, becomes smaller as the number of stage increases. In order to improve coding efficiency, the present paper proposes an adaptive progressive build-up ADCT. The proposed method extracts the areas of the error image that are necessary to improve the quality of the reconstructed image, and only the extracted areas are used to improve the quality of the reconstructed image. The experimental results show that by using the proposed method, the SNR (signal to noise ratio) of the reconstructed image was increased by about 0.6-1.2 (dB), and the average processing time was reduced to about 60%-82%.View full abstractDownload PDF (2797K) -
Masamichi SHIMAZAKI, Takashi NAOI, Yasuo MUKUNOKI, Kunio ISHIGAKI1991 Volume 28 Issue 3 Pages 225-230
Published: May 31, 1991
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSNew technologies which are incorporated in the Fuji contact films “HG-series” are described. 1. Dimensional Stability Dimensional stability is determined by the film expansion during processing. Its expansion consists of two factors which are PET base's water absorption and the release of the stress by emulsion layers. We have introduced water barrier layer onto the PET base which inhibits the water absorption during processing and reduces the stress by emulsion layers. This idea brings about better demensional stability. 2. Antistatic Technology We have introduced the advanced electroconductive layer on the back which realized sufficiently low surface resistivity before and after processing even in low humidity. 3. Vacuum Drawdown Time Bigger matting agent enables shorter vacuum drawdown time but in conventional spherical matting agents they cause pinhole defects under them. We have solved this problem by new matting agent which is porous and irregular shaped.View full abstractDownload PDF (592K) -
Maintenance of Conditions on Printing Press for Realizing Good Print QualityTakeshi YOSHIKAWA1991 Volume 28 Issue 3 Pages 231-235
Published: May 31, 1991
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSIn the decade, printing press performance has been changed to higher speed, higher quality, better operatability and automatic operation. Now, printing companies can employ such advanced machines for their production. However, there are many unstable factors in printing process as water, ink, rubber, paper, chemical and so on. A printer must understand the performances of these unstable factors and how to control them. This paper gives some basic informations for printers to realize better print quality from the side of printing press manufacturer's side.View full abstractDownload PDF (985K) -
Miharu TANAKA1991 Volume 28 Issue 3 Pages 236-238
Published: May 31, 1991
Released on J-STAGE: September 27, 2010
JOURNAL FREE ACCESSDownload PDF (295K)
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