High dynamic range rendering for YUV images with a constraint on perceptual chroma preservation

A new high dynamic range rendering (HDRR) suitable for YUV images is presented. The method overcomes the problem on saturation decrease caused by the conventional HDRRs for YUV images. U and V components are corrected with an approximating function that is designed to preserve the metric chroma in CIELAB before and after an HDRR. The function is derived from the relationship between the changes in the Y component and those in the chroma. The color differences between the images corrected by our method and the ideal images were found to be in an acceptable range, where they can be recognized as being the same color. Our method achieved the highest score in a subjective assessment of preserving the perceptual chroma when it was compared with other methods.