Save Camera Calibration Parameters
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The export of camera parameters from the Camera Calibration toolbox creates its own type of variable that cannot be saved as a .mat. How can I save these so that I can load it when I want to use that camera instead of calibrating it every time? Is xml the only way?
Thanks, Erin
4 Comments
Clive Fox
on 27 Oct 2016
Edited: Clive Fox
on 27 Oct 2016
There is a command toStruct(cameraParams) which seems to work,so if you have created a cameraParameters object in your workspace
mycamParams = toStruct(cameraParams)
save mycamParams.mat mycamParams %Saves as a mat file
clear %clear variables in workspace
load('mycamParams.mat') %loads it back in and Matlab recognises it is a structure
mycamParams=cameraParameters(parameterStruct) % recreates the camera parameters object which you can then use to undistort images etc.
Accepted Answer
Dima Lisin
on 1 May 2014
Edited: Dima Lisin
on 1 May 2014
You certainly can save the camera parameters object into a mat file, just like any other variable. Export the variable to workspace. Let's call it myParams. Then do
>> save myParams.mat myParams
That should work.
2 Comments
Helia Sh
on 12 Dec 2018
I kept getting an error: ""Argument must contain a character vector". I slightly modified Dima's suggestion to make it work for me:
>> save 'myParams' myParams
Matt J
on 12 Dec 2018
Hard to see why the modification was necessary or made any difference. Maybe you were originally using the functional form of save as follows,
save('myParams',myParams)
More Answers (2)
Sean de Wolski
on 13 Mar 2014
With MATLAB R2014a, you can generate equivalent code with the app.
4 Comments
Matt J
on 13 Mar 2014
Edited: Matt J
on 13 Mar 2014
You could write a customized save routine that exports the CameraParameters properties and saves them in a structure
function save_cameraParams(cpObject,fileName)
fields={'IntrinsicMatrix', 'RadialDistortion',etc...}
for ii=1:length(fields)
S.(fields{ii})=cpObject.(fields{ii});
end
save(fileName, 'S');
end
Then a similar one to reload and rebuild the vision.CameraParameters object,
function cpObject=load_cameraParams(fileName)
S=load(fileName); S=S.S
pairs=[fieldnames(S), struct2cell(S)].';
cpObject=vision.CameraParameters(pairs{:});
end
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