BitmapImageRenderImageHog Method

Renders the Hog vector. Each successive group of 36 elements (4 x (9 x 1) histogram) represents gradients (at angles 0, 20, 40, 60, 80, 100, 120, 140, and 160 degrees) in a 16x16 pixel window. This window slides over 8-pixel intervals, starting at top left of image. Rendered image dimensions are (strideX / 36 + 1) * 8, (height + 1) * 8.

Renders the dominant HOG gradients; a 1 dimension array of (angle, gradient), where each element maps to an 8x8 block of an image, whose origin is the top left. Rendered image dimensions are (strideX + 1) * 8, (height + 1) * 8.