document: Quality image metrics for synthetic images based on perceptual color differences Due to the improvement of image rendering processes , and the increasing importance of quantitative comparisons among synthetic color images , it is essential to define perceptually based metrics which enable to objectively assess the visual quality of digital simulations . In response to this need , this paper proposes a new methodology for the determination of an objective image quality metric , and gives an answer to this problem through three metrics . This methodology is based on the LLAB color space for perception of color in complex images , a modification of the CIELab1976 color space . The first metric proposed is a pixel by pixel metric which introduces a local distance map between two images . The second metric associates , to a pair of images , a global value . Finally , the third metric uses a recursive subdivision of the images to obtain an adaptative distance map , rougher but less expensive to compute than the first method
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