Help regarding optimization tool box for image processing?

Hello I have two images a and b, where b is a rotated and translated image of a. Using Sum of Squared Difference method, I have to find the minimization function using optimization tool box by taking 8 by 8 box and running iterations. How do I go about it?

[Matt J]

Write down the function you want to minimize in equation form. Then we can offer advice about how to code it.

[Emmanuel]

Hi! Yeah sure ! Thank you!

cost function = Summation [f(x) - g'(x))^2]

g' is the warped image of f and x is the pixel point. I have to select 8x8 block of pixels, optimize the cost function for n number of iterations.

Can you guide me as to how to code this in optimization toolbox?

[Matt J]

So each 8x8 block must have its own distinct warp parameters? What it the form of the warping? Elastic, affine, rigid?

[Image Analyst]

Please post your two images so we don't have to guess, and can give advice faster .

[Emmanuel]

The warping consits of translation and rotation .

The original picture is :

The warped picture is:

Answer 1

[Image Analyst]

Why not just us imregister() which is in the Image Processing Toolbox?

[Emmanuel]

Yeah! But, I must implement it using optimization tool box. Can you please help me with that?

[Image Analyst]

No. I'm sorry but I don't have that toolbox.

[Image Analyst]

See http://www.mathworks.com/help/vision/examples/find-image-rotation-and-scale-using-automated-feature-matching.html, though your example is pretty substantially different so I don't know how well it would work.

[Sean de Wolski]

Sure, you can frame it as an optimization problem where you minimize the error of the registered images but that's like using a crowbar to tear down a house. It's possible, but it's going to be a lot more work than using a bull dozer.

[Emmanuel]

@Image Analyst Thanks a lot !!!!!!! It works!

@Sean de Wolski Yeah you are right! I am new to Image proc and yet to learn stuffs! Thanks a lot