实现图片特征区域（先选定）然后识别出相同颜色区域的功能。比如指定黄色的区域是背景区域，程序将图片中所有同样颜色背景区域显示出来。-Achieve Pictures feature region (first choice) and then identify the functional areas of the same color. For example, the area is designated yellow background region, the program will image all the same color of the background area is displayed.