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

Junji SUZUKI; Isao FURUKAWA

doi:10.1587/transfun.E96.A.1759

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

Junji SUZUKI, Isao FURUKAWA

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A specification for digital cinema systems which deal with movies digitally from production to delivery as well as projection on the screens is recommended by DCI (Digital Cinema Initiative), and the systems based on this specification have already 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 two color difference models 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 both of the CIE 1976 L^* a^* b^* and CIEDE2000 color difference models. It is also shown that the bit depth derived from the contrast sensitivity function is one bit greater than that derived from the color difference models at the gamma value of 2.6. Moreover, a comparison between the color differences computed with the CIE 1976 L^* a^* b^* and CIEDE2000 leads to a same result from the view point of the required bit depth for digital cinema systems.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E96-A No.8 pp.1759-1767

Publication Date: 2013/08/01

Publicized

Online ISSN: 1745-1337

DOI: 10.1587/transfun.E96.A.1759

Type of Manuscript: PAPER

Category: Image

Authors

Junji SUZUKI
Aichi Prefectural University
Isao FURUKAWA
Hiroshima Institute of Technology

Keyword

digital cinema, human visual system, contrast sensitivity function, quantization bit depth, color difference, CIE 1976 L^* a^*b^*, CIEDE2000

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Junji SUZUKI, Isao FURUKAWA, "Comparative Study on Required Bit Depth of Gamma Quantization for Digital Cinema Using Contrast and Color Difference Sensitivities" in IEICE TRANSACTIONS on Fundamentals, vol. E96-A, no. 8, pp. 1759-1767, August 2013, doi: 10.1587/transfun.E96.A.1759.
Abstract: A specification for digital cinema systems which deal with movies digitally from production to delivery as well as projection on the screens is recommended by DCI (Digital Cinema Initiative), and the systems based on this specification have already 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 two color difference models 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 both of the CIE 1976 L^* a^* b^* and CIEDE2000 color difference models. It is also shown that the bit depth derived from the contrast sensitivity function is one bit greater than that derived from the color difference models at the gamma value of 2.6. Moreover, a comparison between the color differences computed with the CIE 1976 L^* a^* b^* and CIEDE2000 leads to a same result from the view point of the required bit depth for digital cinema systems.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/transfun.E96.A.1759/_p

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@ARTICLE{e96-a_8_1759,
author={Junji SUZUKI, Isao FURUKAWA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Comparative Study on Required Bit Depth of Gamma Quantization for Digital Cinema Using Contrast and Color Difference Sensitivities},
year={2013},
volume={E96-A},
number={8},
pages={1759-1767},
abstract={A specification for digital cinema systems which deal with movies digitally from production to delivery as well as projection on the screens is recommended by DCI (Digital Cinema Initiative), and the systems based on this specification have already 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 two color difference models 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 both of the CIE 1976 L^* a^* b^* and CIEDE2000 color difference models. It is also shown that the bit depth derived from the contrast sensitivity function is one bit greater than that derived from the color difference models at the gamma value of 2.6. Moreover, a comparison between the color differences computed with the CIE 1976 L^* a^* b^* and CIEDE2000 leads to a same result from the view point of the required bit depth for digital cinema systems.},
keywords={},
doi={10.1587/transfun.E96.A.1759},
ISSN={1745-1337},
month={August},}

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TY - JOUR
TI - Comparative Study on Required Bit Depth of Gamma Quantization for Digital Cinema Using Contrast and Color Difference Sensitivities
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1759
EP - 1767
AU - Junji SUZUKI
AU - Isao FURUKAWA
PY - 2013
DO - 10.1587/transfun.E96.A.1759
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E96-A
IS - 8
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - August 2013
AB - A specification for digital cinema systems which deal with movies digitally from production to delivery as well as projection on the screens is recommended by DCI (Digital Cinema Initiative), and the systems based on this specification have already 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 two color difference models 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 both of the CIE 1976 L^* a^* b^* and CIEDE2000 color difference models. It is also shown that the bit depth derived from the contrast sensitivity function is one bit greater than that derived from the color difference models at the gamma value of 2.6. Moreover, a comparison between the color differences computed with the CIE 1976 L^* a^* b^* and CIEDE2000 leads to a same result from the view point of the required bit depth for digital cinema systems.
ER -