A Novel Method for Evaluating Color Accuracy of Displayed Images with Different Formulae

摘要

A new method to evaluate color accuracy of displayed images is established, which samples the typical color values from the images and measure them on the display. The measured color difference calculated by CIEDE76, CIEDE94, CIEDE2000, CMC (1:1) and CMC (2:1) color differences formulae are compared with subjective e-valuation difference and then consistency between calculated and subjective color difference is discussed in the paper. The experiment results show that the human eyes are more sensitive to the neutral color so that the small change of color value can invoke relative large difference sensation while the measured and calculated difference is relative smaller. The color difference calculated by CIEDE76 is much smaller than subjective perceived difference in the near neutral color area and that in the green area is larger than perceived difference, so that the consistency between measured and perceived color differences is very poor. Other formulae show much better result than that of CIEDE76.The results show that CMC (2:1) color difference is the best one for evaluating color images among the 5 color difference formulae, the calculated color difference is almost linear to the visual one. The color difference calculated by CIEDE2000 formula is also smaller than subjective perceived color difference in the near neutral grey area but has good consistency in other area.