自然环境下舌诊图像偏色检测及其颜色校正方法

A Method for Color Cast Detection and Color Correction of Tongue Inspection Images Under Natural Environment

针对自然环境下中医舌象采集中的颜色偏差问题,提出了一种中医舌诊图像的偏色检测及其颜色校正方法.首先根据舌诊图像的颜色分布特征在Lab颜色空间采用基于等效圆的方法进行偏色检测,然后采用改进的灰度世界和完美反射相结合的颜色校正方法对舌诊图像进行处理.实验结果表明,本文提出的偏色检测方法更加符合舌诊图像的实际需求,可以更准确地反映主观感受到的偏色程度;提出的颜色校正方法不需要标准色卡的辅助,相比传统的颜色校正方法,本文方法得到的结果更理想.

Color-cast detection and color correction processes are proposed for tongue inspection from images in traditional Chinese medicine（TCM）under natural environments.First,a color cast detection method based on equivalent circle was applied in Lab color space,then the tongue images were processed by a combination of color correction method of improved gray world（GW）with perfect reflection（PR）according to the distribution characteristics of tongue images.Experimental results show that the proposed color cast detection method complies better with the actual requirements of tong images by reflecting the perceived degree of color cast more accurately.Meanwhile,the color correction method can exhibit a better performance compared with the traditional ones without the aid of colorcheckers.