Question

I am trying to get facial recogniton working in OPencv using http://docs.opencv.org/trunk/modules/contrib/doc/facerec/facerec_tutorial.html. However i Keep getting this error:

    OpenCV Error: Unsupported format or combination of formats
    (In the Eigenfaces method all input samples (training images) must
    be of equal size! Expected 307200 pixels, but was 4915200 pixels.) 
    in train, file /home/itsy/Desktop/OpenCV-2.4.2/modules/contrib/src/facerec.cpp, line 326

So I decided to resize all my images inside my vector using

for(int i=0; i < images().size; i++)
     resize(images[i],images[0],images[0].size(),0,0, INTER_NEAREST ); 

where images is a vector of Mat type and contains all the loaded images.But when I try to compile it it tells me:

facerecognition.cpp:141:27: error: no match for call to ‘(std::vector<cv::Mat>) ()’

which is the line on which for(..) is located. Could someone please help me out?

Answer 1

Since images is not a function, images().size doesn’t make any sense. You want images.size(), since images.size is a function.