HOGDescriptor problem

edit savecancel

Hi! I'm trying to use HOGDescriptor class to get the points of an image and after this use SMV to classify them.

The main problem for me is that if I just do this:

vector<Point> encontrados(50);
HOGDescriptor hog;
hog.detect(img,encontrados);

"encontrados" doesn't have anything.

I think that it may be caused by my images size. They are 40x40 and the default parameters of HOGDescriptor are 64x128. So I tried to declare it before with parameters this way:

Size win_size=Size(40, 40);
HOGDescriptor hog(win_size);

But my program crash: error: no matching function for call to ‘cv::HOGDescriptor::HOGDescriptor(cv::Size&)’|

According to http://docs.opencv.org/modules/gpu/doc/object_detection.html?highlight=hog#gpu::HOGDescriptor this error have no sense.

Can anyone help me? What I'm doing bad? Thanks in advance.