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Asked: 2026-06-09T23:59:56+00:00

I am trying to perform facial recogntion using opencv. For this the training and

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I am trying to perform facial recogntion using opencv. For this the training and test images have to be of the same size.
So I used this function:

resize(testing,output, images[0].size(),0,0,INTER_NEAREST);

Where testing is my Mat from the webcam , Output is the resized image , images[0].size() is my database of vector images.
However I get the following error:

OpenCV Error: Bad argument (Wrong shapes for given matrices. Was size(src) = (1,921600), 
size(W) = (307200,6).) in subspaceProject,
file /home/someplae/OpenCV-2.4.2/modules/contrib/src/lda.cpp, 
line 187
terminate called after throwing an instance of 'cv::Exception'
what():  /home/someplace/OpenCV-2.4.2/modules/contrib/src/lda.cpp:187: 
error: (-5) Wrong shapes for given matrices. Was size(src) = (1,921600), size(W) = (307200,6). 
in function subspaceProject
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1 Answer

  1. Editorial Team

    Although you don’t provide enough code to verify, I can infer the problem from the given number of elements. Your test matrix is 921600 = 3 * 307200… So I guess your input matrix is not a grayscale matrix, but still is in BGR representation.

    You should use cv::cvtColor to convert the matrix to grayscale, before resizing it:

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