Registering high resolution image with blurry image

Hi,

I'm looking for a method to register two images of different sizes and resolution (measured by two different devices). I've tried using the registration estimator toolbox but none of the registration options align/resize the images correctly. I've also tried to blur my high resolution image to match the low resolution of the second but even that does not help for the registration. Ideally, the registration of image '1' (attached) and imaged 'ref' should result in image 'aligned'.

Ideas anyone?

Cheers.

Answer 1

[Steve Eddins]

As of R2024b, the function imregcorr uses a new algorithm called normalized gradient correlation. See my 16-Oct-2025 blog post for more information. That function can now register these two images successfully.

moving = imread("Smp180_VIS_1.png");
fixed = imread("Smp180_VIS_ref.png");
imshowpair(fixed, moving, "montage")

tform = imregcorr(moving, fixed)

tform = 
  simtform2d with properties:

    Dimensionality: 2
             Scale: 0.3675
     RotationAngle: 8.4500
       Translation: [87.4448 63.7681]
                 R: [2×2 double]

                 A: [0.3635   -0.0540   87.4448
                     0.0540    0.3635   63.7681
                          0         0    1.0000]

[moving_reg, moving_reg_ref] = imwarp(moving, imref2d(size(moving)), tform);
imshowpair(moving_reg, moving_reg_ref, fixed, imref2d(size(fixed)))