Comparative Study on Required Bit Depth of Gamma Quantization for Digital Cinema using Contrast and Color Difference Sensitivities

URI http://harp.lib.hiroshima-u.ac.jp/it-hiroshima/metadata/10648
File
Title
Comparative Study on Required Bit Depth of Gamma Quantization for Digital Cinema using Contrast and Color Difference Sensitivities
Author
氏名 Furukawa Isao
ヨミ フルカワ イサオ
別名 古川 功
氏名 Suzuki Junji
ヨミ スズキ ジュンジ
別名 鈴木 純司
Subject
digital cinema
human visual system
contrast sensitivity function
quantization bit depth
color difference
CIE 1976 L*a*b*
Abstract

A specification for digital cinema systems which deal with movies digitally from production to delivery and projection on the screens is recommended by DCI (Digital Cinema Initiative), and systems based on this specification have been developed and installed in theaters. The parameters of the systems that play an important role in determining image quality include image resolution, quantization bit depth, color space, gamma characteristics, and data compression methods. This paper comparatively discusses a relation between required bit depth and gamma quantization using both of a human visual system for grayscale images and a color difference model for color images. The required bit depth obtained from a contrast sensitivity function against grayscale images monotonically decreases as the gamma value increases, while it has a minimum value when the gamma is 2.9 to 3.0 from CIE 1976 L*a*b* color difference model. It is also shown that the bit depth derived from the contrast sensitivity function is one bit greater than that derived from the L*a*b* color difference model at the gamma value of 2.9.

Journal Title
広島工業大学紀要. 研究編
Volume
46
Spage
187
Epage
196
Published Date
2012-02
Publisher
広島工業大学
ISSN
1346-9975
NCID
AA11599110
NAID
40019182703
Language
eng
NIIType
Departmental Bulletin Paper
Text Version
出版社版
Old URI
Set
it-hiroshima