Color information is usually discarded when converting a color image into a grayscale image. However, it is sometimes desirable to reflect chrominance change where luminance contrast is not obvious. Inspired by tone mapping technique, this paper proposes a similar method for color to grayscale conversion, which in addition takes into account the local chrominance changes. The result shows great...

This paper evaluates the role of various stages in the human visual system in the detection of spatial patterns. Contrast sensitivity measurements were made for interference fringe stimuli in three directions in color space with a psychophysical technique that avoided blurring by the eye's optics including chromatic aberration. These measurements were compared with the performance of an ideal o...

The purpose of this study was to investigate the effect of color contrast on luminance discrimination. Observers were required to indicate the more intense of two stimuli presented briefly in a surround. In some conditions the two stimuli were the same chromaticity as the surround, while in other conditions the stimuli differed in chromaticity from the surround. The luminance of the fixed test ...