MATLAB: How to get fused output image from ‘imregister’

imageImage Processing Toolboximregister

Given: I have fused two images with function 'imregister'.

Want: The 'imregister' provides a transformed image, but no details on fused image. I want to get output of fused image, where you can see 'pink' and 'green colors.

Needed: Is there any way to get the fused image itself, not only the transformed image?

[ACKNOWLEDGMENTS]

I will vote for all your answers.

Thank you for any help.

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I think I found the solution, and it would be to use 'imregtform' instead of 'imregister', followed by 'imfuse'.

Can anyone confirm, please?

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MATLAB: How does imregister work

Marina,

Thank you the feedback. The documentation for imregtform/imregister could be improved to include more information about Pyramiding. I will see to it we take care of that.

In the meantime: The algorithm used by imregtform/imregister build an image pyramid that has N levels. Each pyramid level decreases the resolution by a factor of 2 in each dimension. If you start with a 64x64 image, and have three pyramid levels, then your pyramid will consist of a 64x64 grid, a 32x32 grid, and a 16x16 grid. Optimization starts at the coarsest level of the pyramid (16x16) and continues at this level until either MaximumIterations is reached, or until the optimizer converges. At this point, the optimizer starts again by attempting to refine the current transformation estimate on the next pyramid level (32x32). This process continues until you get back to the original full resolution data that you provided to imregister.

In short, yes, imregister/imregtform internally build a multi-resolution pyramid in memory and solve an optimization problem on each level of the pyramid. Please let me know if there is any aspect of your question that I did not address.

Thanks,

Alex.

MATLAB: Problem with “imregister” function

Because imregister works with volumetric input as well as with planar 2-D images, there is ambiguity with multi-channel 2-D images, like your RGB input image.

To avoid this ambiguity, you need to form a 2-D image from your RGB image prior to calling imregister. One way to do this is to use rgb2gray on your moving and fixed images prior to calling imregister:

 fixed  = rgb2gray(fixed);
 moving = rgb2gray(moving);

You could also use a particular color channel, as ImageAnalyst suggested.

Otherwise, imregister is going to interpret your input imagery as a 3-plane volume. The error message you are getting is telling you that with the default number of PyramidLevels, there aren't enough pixels along the 3rd dimension to form a pyramid.

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Related Solutions

MATLAB: How does imregister work

MATLAB: Problem with “imregister” function

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