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How to remove distortions from an image which is imported in MATLAB as a matrix of pixel values (as a file.MAT)?

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Antonino Tirino
Antonino Tirino 2023-3-6
回答： DGM 2023-3-7
Hi, I'm going to show my problem. By using a thermographic camera an image is recorded and saved as a file.MAT, so in MATLAB I get a matrix which have the same dimensions of the ones of the thermal image. I can print this image by using "imagesc". The problem is that the thermal camera is located with a certain lateral angle with respect the target object which is recorded, so the printed image (with imagesc) appears distorded: it should be be a square image, instead it's a trapeze. My purpose is to remove this distortion. How can I go on? Should I use an interpolation?Furthermore each pixel value in the matrix must be remain the same. Thanks

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回答（2 个）

Image Analyst
Image Analyst 2023-3-7
There is a camera calibration capability in the Computer Vision Toolbox. Check it out.
Also see Steve's blog: Spatial transformations Defining and applying custom transforms Steve on Image Processing
DGM
DGM 2023-3-7
Alternatively, if you don't have CVT, and you're not processing many images, you could use fitgeotrans() and imwarp().
This is one simple example.
https://www.mathworks.com/matlabcentral/answers/456973-how-to-make-an-image-straightener-like-that-of-cam-scanner-app

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