Halcon difference与sub_image的区别

1.difference算子检测region形状的差别，计算对象是两个region，不考虑region灰度值是否有差异；

2.sub_image算子是灰度值相减，计算对象是两幅图像，主要检测图像区别，和形状没有多大关系；

g' = (ga - gb) * Mult + Add

dev_update_off ()
dev_close_window ()
read_image (blackImage, 'E:/myhalcon/black.bmp')
read_image (grayImage, 'E:/myhalcon/gray.bmp')
dev_open_window_fit_image (grayImage, 0, 0, -1, -1, WindowHandle)
set_window_param (WindowHandle, 'background_color', 'white')
dev_clear_window ()
gen_rectangle1 (Rectangle, 100, 100, 300, 300)
reduce_domain (blackImage, Rectangle, blackImageReduced)
reduce_domain (grayImage, Rectangle, grayImageReduced)

* 检查形状区别，不考虑区域灰度值
difference (blackImageReduced, grayImageReduced, RegionDifference)
* 灰度值相减，不考虑形状
sub_image (blackImageReduced, grayImageReduced, ImageSub, 1, 200)

gen_rectangle1 (Rectangle1, 200, 200, 400, 400)
reduce_domain (blackImage, Rectangle1, blackImageReduced1)
sub_image (blackImageReduced, blackImageReduced1, ImageSub, 1, 200)