把目标范围缩小到一个小矩形内，将图像的G通道单独抽出作分析，抽出来的是一个灰度图，现在需要将目标从背景中提取出来。使用imadjust函数增强图像对比度时可以使用stretchlim传递给imadjust灰度范围，matlab循环调用图片进行处理-The target was restricted to a small rectangle, the image of the G-channel single out for analysis, out of is a grayscale, and now need to extract the target from the background. Use imadjust function and enhance image contrast can be passed to the imadjust use stretchlim gray area, matlab image processing cycle call