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Resize and then sum/overlap/mix two images. Code:
         
Input:          
         
Output:          
         
         
         

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Resize the image, with "downscale" (namely, decrease the size of the image) and "upscale" (increase the size of the image), by measuring pixel distance by mouse clicks: the first two clicks are obtained from the ends of a diagonal of the image, and the last two clicks are feature needed. Code:
         
         
Input:          
         
Output:          
         
         

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Simple resize an image. Code:
         
         
Input:          
         
Output:
         

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Transparent overlays of two images after resize. Code:
                  
Input_1:          
         
         
Output_1:
         
         
Input_2 (The surroundings in the first image below is transparent, refer to page4341):          
         
         
Output_2 (The output image with transparent background is not good):
         

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Simple overlap script especially for program test. Code:
                  
Input_1 (the second image was obtained from image shift method, refer to page4341):          
         
         
Output_1:
         

Input_2 (the second image was obtained from ROI method, refer to page4341):          
         
         
Output_2:
         

Input_3 (the first image was obtained by image shift method, and second image was obtained from ROI method, refer to page4341):          
         
         
Output_3: