Brightness Contrast And Sharpness, Interactive Factors In Perceptual Image Quality

Jacques A. J. Roufs

doi:10.1117/12.952704

15 August 1989 Brightness Contrast And Sharpness, Interactive Factors In Perceptual Image Quality

Jacques A. J. Roufs

Proceedings Volume 1077, Human Vision, Visual Processing, and Digital Display; (1989) https://doi.org/10.1117/12.952704
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

Abstract

Brightness contrast is an important factor in perceptual image quality. In the case of a TV system it is dominantly determined by the luminance reproduction function. Subjective quality was found to be optimal for non-linear luminance transfer and closely related to (subjective) brightness contrast. Quality is also related to sharpness, which in turn depends on the non-linear transfer. Fortunately, in the neighbourhood of the optimum, quality is dominantly determined by brightness contrast. It will be shown that brightness contrast is not adequately characterized by the luminance contrast ratio, which is defined as the ratio of the luminance extremes. Alternative and more suitable contrast measures in terms of luminance are discussed.

Citation Download Citation

Jacques A. J. Roufs "Brightness Contrast And Sharpness, Interactive Factors In Perceptual Image Quality", Proc. SPIE 1077, Human Vision, Visual Processing, and Digital Display, (15 August 1989); https://doi.org/10.1117/12.952704

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