watersheds算子

read_image (Br2, 'particle')
*高斯滤波
gauss_filter (Br2, ImageGauss, 9)
*反转图片，8位单色图（255-原像素）
invert_image (ImageGauss, ImageInvert)
*分水岭算法
watersheds (ImageInvert, Basins, Watersheds)
dev_set_draw ('margin')
dev_set_colored (12)
dev_display (Br2)
dev_display (Basins)

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