Remove Distortion from an Image Using the Camera Parameters Object

%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)');

Answer 1

[Image Analyst]

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.

[chee gang ngui]

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]

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.

[chee gang ngui]

thank you