Check whether two images are registered

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Hi,

I have two images that are partially overlapping. I know the projection matrix for each of the images. I would like to check if the images are well aligned to each other. I was thinking to do the following steps: find the similar features find the features' world coordinates calculate the distances between each pair of the corresponding features. I wonder if there is a quicker way to check if the images are aligned. Let's assume that I marked one feature in one of the images so I know [x, y, z, i, j]. Is there a way to find what is the corresponding feature in the other image?

Thanks in advance for any leading answers.