Horizontal Histogram in OpenCV

Question

I am newbie to OpenCV,now I am making a senior project related Image processing. I have a question: Can I make a horizontal or vertical histogram with some functions of Open

Answer 1

Updating carnieri answer (some cv functions are not working today)

import numpy as np
import cv2

def verticalProjection(img):
    "Return a list containing the sum of the pixels in each column"
    (h, w) = img.shape[:2]
    sumCols = []
    for j in range(w):
        col = img[0:h, j:j+1] # y1:y2, x1:x2
        sumCols.append(np.sum(col))
    return sumCols

Regards.