Remove Distortion from an Image Using the Camera Parameters Object

2022 5 27
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更新时间：2022 6 3
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%The following numbers are the parameter after export from camera calibration.
Standard Errors of Estimated Camera Parameters
---------------------------------------------
Intrinsics
----------
%Focal length (pixels): [ 3882.2250 +/- 14.6398 3869.1827 +/- 14.6405 ]
%Principal point (pixels):[ 1943.6227 +/- 2.8872 1562.0646 +/- 3.4771 ]
%Radial distortion: [ -0.2094 +/- 0.0025 0.0879 +/- 0.0125 0.1341 +/- 0.0253 ]
%Tangential distortion: [ -0.0004 +/- 0.0001 -0.0001 +/- 0.0001 ]
I am using the following code to undistort my image, but I not sure what number should I enter based on my parameter numbers above. This is the link ( https://www.mathworks.com/help/vision/ug/remove-distortion-from-an-image-using-the-cameraparameters-object.html ) below.
IntrinsicMatrix = [715.2699 0 0; 0 711.5281 0; 565.6995 355.3466 1];
radialDistortion = [-0.3361 0.0921];
cameraParams = cameraParameters('IntrinsicMatrix',IntrinsicMatrix,'RadialDistortion',radialDistortion);
% Remove distortion from the images.
I = imread(fullfile(matlabroot,'toolbox','vision','visiondata','calibration','mono','image01.jpg'));
J = undistortImage(I,cameraParams);
% Display the original and the undistorted images.
figure; imshowpair(imresize(I,0.5),imresize(J,0.5),'montage');
title('Original Image (left) vs. Corrected Image (right)');

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回答（1 个）

Image Analyst
Image Analyst 2022-5-27

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If the distortion varies by all those amounts (the ranges you listed) then I don't know how to tell how much any one particular image was distorted - what it's specific parameters were. You might just have to do trial and error to see what works well. Hopefully whatever you find will work decently on all the other images.

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chee gang ngui
chee gang ngui 2022-5-27
Thank you for your feedback. I not sure which numbers should I enter to the IntrinsicMatrix, radialDistortion and Tangential distortion to do the trail. Could you give me an example on how you enter the numbers to the code below?
IntrinsicMatrix = [];
radialDistortion = [];
Tangential distortion = []
Image Analyst
Image Analyst 2022-5-27
Put numbers inside the brackets. Sorry I have never used that function so I'd have to consult the documentation just like you'll have to do. Good luck.

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