cameraIntrinsics expects 'abcd' to be type double, single.

I need to specify camera Intrinsics.

For this i wrote:

KameraInnereien=cameraIntrinsics('focalLength',[0 0] ,'ImageSize',[1440 2560],'PrincipalPoint',[720 1280]);

When executing i get the Error:

Error using cameraIntrinsics

Expected abcd to be one of these types:

double, single

Error in vision.internal.cameraIntrinsicsImpl>parseInputsSimulation (line 223)

validateattributes(focalLength, {'double', 'single'}, ...

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Error in vision.internal.cameraIntrinsicsImpl>parseInputs (line 213)

r = parseInputsSimulation(defaultParams,varargin{:});

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Error in vision.internal.cameraIntrinsicsImpl (line 82)

r = parseInputs(varargin{:});

^^^^^^^^^^^^^^^^^^^^^^^^

Error in cameraIntrinsics (line 17)

this = [e-mail](varargin{:});

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Error in CV (line 134)

KameraInnereien=cameraIntrinsics('abcd',1 ,'focalLength',[0 0] ,'ImageSize',[1440 2560],'PrincipalPoint',[720 1280]); %'focalLength',[0 0] ,

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Looking into the function that throws the Error shows the variable 'abcd', (which is kinda weird it looks like a Placeholder):

function r = parseInputsSimulation(defaultParams,varargin)

    parser = inputParser;
    focalLength = varargin{1};
    validateattributes(focalLength, {'double', 'single'}, ...
                {'vector','real', 'nonsparse', 'finite', 'positive'}, ...
                'cameraIntrinsics', 'abcd');
    
    filename = 'cameraIntrinsics';
    parser.addRequired('focalLength', @(f)vision.internal.inputValidation.validateFocalLength(f,filename));
    parser.addRequired('principalPoint', @(p)vision.internal.inputValidation.validatePrincipalPoint(p,filename));
    parser.addRequired('imageSize', @(sz)vision.internal.inputValidation.validateImageSize(sz,filename));
    
    parser.addParameter('RadialDistortion', defaultParams.RadialDistortion, ...
        @vision.internal.calibration.CameraParametersImpl.checkRadialDistortion);
    parser.addParameter('TangentialDistortion', defaultParams.TangentialDistortion,...
        @vision.internal.calibration.CameraParametersImpl.checkTangentialDistortion);
    
    parser.addParameter('Skew', defaultParams.Skew, @cameraIntrinsics.checkSkew);
    
    % Parse and check optional parameters
    parser.parse(varargin{:});
    r = parser.Results;
end

What shall i do to avoid it, i tried declaring abcd when calling cameraIntrinsics, but obviously that did not work.

KameraInnereien=cameraIntrinsics('abcd',1  ,'focalLength',[0 0] ,'ImageSize',[1440 2560],'PrincipalPoint',[720 1280]);

Doing it with string Names " " instead of char ' ' does obviously not change the outcome.

Is abcd a Placeholder that is not implemented right or is the error on my part?

Answer 1

[Alexander Szambor]

Ah my Error was that the Focal Length is not Positive, you can not use 0, 0 which is hindering, what if i want to use a virtual image/ a pinhole camera, so without distortion?