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Hi,

This is the common scheme for such a case:

1.extract HOG feature; Extract Optical flow feature.

2.Normalize HOG vector;Normalize OF vector.

3.Concatenate HOG and OF vectors.

4.Normalize again the concatenated vector.

Some things to remember:

1.Try which is the best normalization method in your case L2 L1 ...

2.Try different vector length for each feature.

3.Try several Image flow techniques.

Good luck