说明：  本代码主要是对一幅灰度图像rice.jpg进行一些处理，消除rice.jpg图像中的亮度不一致的背景，并使用阀值分割将修改后的图像转换为二值图像，使用轮廓检测返回图像中目标对象的个数以及统计属性。
(This code is a major grayscale rice.jpg some processing, the brightness of the image to eliminate inconsistencies rice.jpg the background, and use the modified threshold segmentation of the image is converted to binary image, use back image contour detection the number of objects in the target and statistical properties.)