For the color image, an independent component analysis (ICA) algorithm was to be used first to analyze and get a serviceable gray image, then the PCA was used to detect gray image edge.

• 对于彩色图像，提出先用独立成分分析算法得出一幅具有全局特性的灰度图，再利用主要成分分析算法进行边缘特征提取。