冷色调图像的灰度化及其客观评价方法

摘要

Because the traditional gray processing used for color images only considers characteristics of the visual perception of color ,an improved algorithm of the gray processing used for cold-tone images was presented .The algorithm took the specific composition of colors in a color image into account ,and used the weighted average to process the red component for the second time according to the human eye sensitivity to three primary colors based on an experienced weighted mean value method .The experimental verification was conducted .The results show that the proposed algorithm can achieve better grayscale effect .In ad-dition ,an objective evaluation method of the grayscale effect on color images was presented ,and an objective evaluation of the grayscale effect on cold-tone images used in the experiment was made depending on the method .The evaluation results are con-sistent with the experimental ones .The improved algorithm and the objective evaluation method have universality .%针对传统的彩色图像灰度化方法仅考虑视觉对色彩的感知特点，提出一种将冷色调图像进行灰度化的改进算法。兼顾彩色图像中色彩的具体组成，在经验加权均值法的基础上，对红色分量按照人眼对三基色的敏感程度再一次进行加权平均。对此进行实验验证，验证结果表明，该算法可取得比较好的灰度化效果。提出一种客观评价彩色图像灰度化效果的方法，根据该方法对实验所用的冷色调图像的灰度化效果进行客观评价，评价结果与实验结果一致。该算法和该方法具有普适性。