MATLAB: How to Align two images by using specifc coordinates of an object automatically

image alignmentimage analysisimage processingImage Processing Toolbox

I have a reference image, and a scanned image(for example). The scanned image does not have the same position as the reference image, how can I align them by using the black box on the left side of the reference image? I have the coordinates of the black boxes on the reference image, while the scanned image is unknown. I want it to align automatically after scanning the image. Thank you

Best Answer

You can use imregister().

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MATLAB: How to get displacement field from tform

Hi Silja,

The issue is because you are using an incomplete syntax of 'imwarp' in the code. 'imwarp' function has an 'OutputView' parameter to preserve world limits and resolution of the fixed image when forming the transformed image.

Use the following line of code instead of 'moving_reg1 = imwarp(moving,tform);'

moving_reg1 = imwarp(moving,tform,'OutputView',imref2d(size(fixed)));

MATLAB: Imregister is not performing well

This is a limitation of the 'imregister' function. The local minimum 'imregister' finds during calculation often does not correspond to the global minimum for this type of image. Specifically, when the image is circularly symmetric (which may confuse the rotation estimation). Using more local features (such as with MSER regions) is likely to be a better approach.

However, you can try to convert the images to grayscale images (using rgb2gray) and then use 'imregister' function(as it expects grayscale arguments). Read the below documentation:

doc_link

imregister (rgb2gray(moving), rgb2gray(fixed), 'affine', optimizer, metric);

Best Answer

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MATLAB: How to get displacement field from tform

MATLAB: Imregister is not performing well

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