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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。
Chromatic objects on the surface of the object is a stable feature unrelated to the shape of the object, known as color invariance. However, due to the presence of highlights and shading, the chromaticity at the point corresponding to the surface of the object in the image changes without color invariance. Correct understanding of the image color is based on the establishment of a physical model of color reflection. In this paper, the dichromatic reflection model proposed by Klinker is used to do plane fitting with KL transform in a 3D color histogram. The interface reflection component and the body reflection component ( body reflection component to calculate the chromaticity coordinates of the light source and the object. The limitations of the actual CCD camera are discussed and the experimental results are given.