MATLAB Answers

Save Camera Calibration Parameters

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Erin
Erin 13 Mar 2014
댓글: Aditi Singh 8 Oct 2019
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

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Erin
Erin 13 Mar 2014
It's a 1x1 vision.CameraParameters object
Clive Fox
Clive Fox 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.
Aditi Singh
Aditi Singh 8 Oct 2019
I have an image how can I find camera calibration for that.

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채택된 답변

Dima Lisin
Dima Lisin 1 May 2014
편집: Dima Lisin 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.

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Helia Sh
Helia Sh 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
Matt J 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)

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추가 답변(2개)

Sean de Wolski
Sean de Wolski 13 Mar 2014
With MATLAB R2014a, you can generate equivalent code with the app.

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Erin
Erin 13 Mar 2014
I unfortunately have 2013b not 2014a.
Image Analyst
Image Analyst 13 Mar 2014
You can probably get a free upgrade if you purchased R2013b.
Erin
Erin 13 Mar 2014
It's a company license so I can't.
Basically I am trying to save the object of the type vision.CameraParameters class. I would like to be able to save it out of my workspace so that I can just reload it to use it for undistortImage instead of rerunning the calibration each time my workspace gets cleared.

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Matt J
Matt J 13 Mar 2014
편집: Matt J 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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