Abstract
In this paper, we proposed a new image quality evaluation index—Color
Distribution Index (CDI). It considers color gamut, contrast ratio, maximum
luminance, gamma characteristics, and Just Noticeable Difference (JND) as
human visual system to evaluate the ability for reproducing visually smooth
gradation. When the CDI cell was defined, we verified JND from a fundamental
matter, such as JND in luminance and chromaticity, using the latest TV sets.
According to our investigations, luminance JND was $\Delta L/L =0.01$ and chromaticity JND was $\Delta u'v' =0.001$. We used these
with unit CDI cell and evaluated bit depth needed for high image quality without
any visible false contour. We clarified that 12 bit is needed for necessary
and sufficient condition to reproduce high image quality with TV set designed
based on BT.709. Also, we clarified that color gamut, contrast ratio, maximum
luminance, gamma characteristics and bit depth should be balanced to achieve
TV sets of high image quality from the viewpoint of the total image quality
improvement.
© 2008 IEEE
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