blob+差分+特征
显示算子
read_image (Image, ‘pcb’)
dev_close_window ()
get_image_size (Image, Width, Height)
dev_open_window (0, 0, Width, Height, ‘black’, WindowHandle)
dev_display (Image)
*进行灰度开运算（亮区减少）
gray_opening_shape (Image, ImageOpening, 7, 7, ‘octagon’)
*灰度闭运算（亮区增多）
gray_closing_shape (Image, ImageClosing, 7, 7, ‘octagon’)
*提取经过开运算处理后的亮区和暗区
dyn_threshold (ImageOpening, ImageClosing, RegionDynThresh, 75, ‘not_equal’)
显示
dev_display (Image)
dev_set_color (‘red’)
dev_set_draw (‘margin’)
dev_display (RegionDynThresh)