How can I get features by extracthogfeatures function?

I used following code to extract HOG feature from an image, but it returns nothing.

[featureVector,hogVisualization] = extractHOGFeatures(I,'BlockSize',[16 16],'BlockOverlap',[8 8]);

The image size is 32*32 and the featureVector is an empty matrix.

The image takes from mouth region. </matlabcentral/answers/uploaded_files/79686/122.jpg>

[KSSV]

You should attach the image on which you tried this function.

Answer 1

[jenny]

If I understand what you writed the Number of overlapping cells between adjacent blocks is the half (50%) and the blolck size is [16,16] and this parametrs are the default parametrs so you can delete this parametrs from the syntax.