HOG feature extraction cell size

Hi

I use hog feature extraction in images to detect the horizon line. Default cell size for hog feature extraction is 8x8. When I use 16x16 I get better result of the accuracy of identifying horizon line. But in some images 8x8 is working better. However in general 16x16 is more successful. I didn't understand why 8x8 is working better in some images while 16x16 is more successful in general? What is the effectiveness of cell size in hog feature extraction?

Thank you

Answer 1

[Amy]

From the documentation for extractHOGFeatures: To capture large-scale spatial information, increase the cell size. When you increase the cell size, you may lose small-scale detail

There is not one optimal cell size. The best size depends on your data.