Halcon difference與sub_image的區別

1.difference算子檢測region形狀的差別，計算對象是兩個region，不考慮region灰度值是否有差異；

2.sub_image算子是灰度值相減，計算對象是兩幅圖像，主要檢測圖像區別，和形狀沒有多大關系；

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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)

* 檢查形狀區別，不考慮區域灰度值
difference (blackImageReduced, grayImageReduced, RegionDifference)
* 灰度值相減，不考慮形狀
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)