Image registrations between depthmap and it's corresponding image
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Hello MATLAB community.
I need help in spatially register two images.
I have an image in colormap(MXNX3 unit8) and it's corresponding depthmap array(M*N double). The depthmap is spatially a bit off and I want to register them and save the output. I tried doing it in registerEstimator app. It thrown errors saying "Registration failed. Try improving the quality of the matched features."
The code I have also not registered properly. Need help please.
My code:
clc
close all
img1 = imread('.jpg');
load('.mat');
img2 = A;
figure(1),imagesc(img2); figure(2),imagesc(img1);
img1_gray = rgb2gray(img1);
fixed = img1_gray;
img2_double = im2double(img2);
moving = img2_double;
[optimizer, metric] = imregconfig('monomodal');
tform = imregtform(moving, fixed, 'translation', optimizer, metric);
registered = imwarp(moving, tform, 'OutputView', imref2d(size(moving)));
figure(3);
subplot(1,3,1); imshow(fixed); title('Fixed Image');
subplot(1,3,2); imshow(moving); title('Moving Image (Before)');
subplot(1,3,3); imshow(registered); title('Registered Image');
3 个评论
Walter Roberson
2025-7-9
It would help to have your jpg and your mat for testing purposes.
Eswar
2025-7-9
Walter Roberson
2025-7-9
No.
采纳的回答
Ronit
2025-7-14
This is a common issue when registering a color image and a depth map since they have very different intensity patterns. Here is what I recommend you try to resolve this query:
- Normalize the depth map: Depth values can be very different in scale from image intensities. Normalizing helps registration algorithms compare them more effectively.
img2_norm = mat2gray(img2);
- Use feature-based registration: Since the two images are different modalities, feature-based methods (like SURF or ORB) work better than standard intensity-based registration.
% Extract and match features
pts1 = detectSURFFeatures(rgb2gray(img1));
pts2 = detectSURFFeatures(im2uint8(img2_norm));
- If not enough features, try intensity-based registration with 'multimodal': This is more robust for images with different intensity distributions.
[optimizer, metric] = imregconfig('multimodal');
tform = imregtform(img2_norm, rgb2gray(img1), 'translation', optimizer, metric);
- Visualize with 'imshowpair': This helps you check the alignment before and after registration.
imshowpair(rgb2gray(img1), img2_norm); % Before
imshowpair(rgb2gray(img1), registered_img2); % After
Please refer to the documentation pages of the above-described MATLAB functions:
- 'mat2gray': https://www.mathworks.com/help/releases/R2024b/images/ref/mat2gray.html
- 'detectSURFFeatures': https://www.mathworks.com/help/releases/R2024b/vision/ref/detectsurffeatures.html
- 'imshowpair': https://www.mathworks.com/help/releases/R2024b/images/ref/imshowpair.html
I hope the above information helps you resolve the query!
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