How to perfectly align 2 scanned multiple choice paper images?

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Vic 2013-1-11

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I there a way somehow to align 2 scanned multiple choice paper images? Maybe by using a bar code to auto align them or using a specific shape so i can compare or find the differences in the answers between the two papers?

Thanking you in advance.

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Image Analyst 2013-1-11

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Yes. See the imregister() function in the Image Processing Toolbox.

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Walter Roberson 2013-1-12

Convert the images to grayscale before aligning them.

Image Analyst 2013-1-13

The alignment will probably be the same on a monochrome image as if you could do it on a color image. Just apply the transform you get to all three color channels one at a time and recombine into a color image.

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