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Compare images based on dimension or shape similarity index?

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ahassan on 5 Sep 2021
Answered: Image Analyst on 26 Sep 2021 at 14:47
I have a CAD design of a simple model that is being 3D printed. To evaluate the print quality we used optical microscopy images of the model and qualitatively decide on the printing quality. I need to make this procedure quantitative, but I am not sure which index, or algorithm to use. My main attribute of quality is dimension and shape similarity. I tried the structural similarity index (SSIM), but since I did it on gray scale images and sometimes the microscopy images are not identifcal in contrast and exposure the results were not convincing. So is SSIM good for what I want but with more care to image processing may be by comparing binary images rather than grayscale? or is there another procedure/index better?

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