Two problems are considered ; What kinds of assessment words are adequate to evaluate HDTV pictures? What kinds of physical factors and characteristics are important to obtain a good picture quality? In the Monitor Image System, the perceptual properties should not be used positively. On the contrary, in the entertainment system, the perceptual properties can be used positively. Some kinds of settled convictions on picture coding are wrong in HDTV. The assessment word : natural, smooth, continuous, and stable are important in Entertainment HDTV.
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