OpenCV 2D Histogram

2D Histogram

One dimensional histogram only needs to consider gray value, but 2D histogram needs to consider hue and saturation.

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2D histogram in OpenCV
The parameters of cv2.calcHist() method are different between one-dimensional histogram and 2D histogram,parameters should be modified as follows:

• channels = [0, 1] :We need to deal with both H and S channels at the same time
• bins = [180, 256]: 180 for H channel and 256 for S channel
• range = [0, 180, 0, 256]: The value range of H is 0 to 180, and the value range of S is 0 to 256

import cv2
import numpy as np
img = cv2.imread('pict