彩色图像中颜色不变性和耀斑的分离（Ⅰ）

景物中物体表面的色品是与该物体形状无关的稳定特性,称为颜色不变性。但是,由于耀斑(highlight)和影绸(shading)的存在,图像中对应物体表面点的色品却是变化的,不具有颜色不变性。正确理解图像颜色的基础是建立颜色反射的物理模型。本文叙述了根据Klinker提出的双色反射模型(the dichromatic reflection model),在三维颜色直方图(3D color histogram)中利用K-L变换做平面拟合,分离面反射分量(interface reflection component)和体反射分量(body reflection component),从而计算光源和物体颜色色度坐标的方法,讨论了实际CCD摄像机的局限性,给出了实验结果。

The separation of color invariance and highlight in color image (Ⅰ)

The chromaticity of an object surface in scene is a constant feature irrelevant to the object shape, which is called color in-varianoe. But that of the corresponding object in image is variable because of the existance of highlight and shading, no color constancy is observed. To construct a physical model of color reflection is a way to understand the image color correctly. This paper describes a method for computing illuminant and object chromaticity coordinate, which is based on the Dichromatic Reflection Model proposed by klinker et al1]. first deals with plane fitting in 3D color histogram using K-L transform, then separates the interface reflection component from the body reflection component. Also the limitation of practical CCD cameras is discussed and the experimental results are presented. (Fig.1~3: see color inset No.1~9).