Hi JCD,
When dealing with image transformations and reversals in Matlab, it is crucial to ensure the correct usage of functions and data. In your case, the issue might lie in the transformation process or the way the transformation is applied to the image.
To address the problem of obtaining an output image of zeros, let's delve into potential solutions and optimizations:
Check Data Consistency:
Verify that the calImg.mat file contains the correct image data and is loaded properly into the variable calImg.Ensure that the fixedPoints and movingPoints arrays (W and I respectively) are correctly defined and correspond to the intrinsic and real-world coordinates.
Transformation Function:
The fitgeotform2d function fits a geometric transformation between two sets of control points. Ensure that the transformation type ("projective" in this case) is appropriate for your transformation needs. Double-check the correctness of the transformation by inspecting the tform object after fitting the transformation.
Image Warping:
The imwarp function applies the geometric transformation to the image. Ensure that the transformation is correctly applied to the image J. Verify that the OutputView parameter is correctly specified. In your code snippet, there seems to be a syntax error in specifying OutputView=imref2d(size(J)). The correct syntax should be OutputView, not OutputView=.
Here is a revised version of your code snippet with potential corrections:
load("calImg.mat")
J = double(calImg);
fixedPoints = W;
movingPoints = I;
figure(1)
imagesc(J)
tform = fitgeotrans(movingPoints, fixedPoints, "projective"); % Use fitgeotrans instead of fitgeotform2d
Jregistered = imwarp(J, tform, 'OutputView', imref2d(size(J))); % Correct the syntax for OutputView
figure(2)
imshowpair(I, Jregistered)
By making these adjustments and ensuring the correctness of data and function usage, you should be able to reverse the transformation successfully and obtain a meaningful output image instead of a matrix of zeros. Remember to validate each step and inspect intermediate results for better debugging and understanding.
