compare histogram comparison method isn't working in opencv 3.1.0

Question

I have to compare two images using cv2.compareHist() function. But I got error on the comparison method i.e. CV_COMP_CORREL. I use OpenCV 3.1.0. Error is NameError: name 'CV_COMP_CORREL' is not defined.

I tried with cv.CV_COMP_CORREL and cv2.cv.CV_COMP_CORREL, but I got the same type error.

Here is my code:

import cv2
import numpy as np
from matplotlib import pyplot as plt
image = cv2.imread("29.jpg",0)
image1 = cv2.imread("29.jpg",0)
hist1 = cv2.calcHist([image],[0],None,[256],[0,256])
hist2 = cv2.calcHist([image1],[0],None,[256],[0,256])
compare = cv2.compareHist(hist1,hist2,CV_COMP_CORREL)

You may use `0` instead of `CV_COMP_CORREL` – Jeon Oct 14 '16 at 17:48 — Jeon, Oct 14 '16 at 17:48
The name is probably something like "cv2.COMP_CORREL" – Miki Oct 14 '16 at 21:38 — Miki, Oct 14 '16 at 21:38

score 6 · Accepted Answer · answered Feb 13 '17 at 14:03

6

If you're still struggling with this; I found the answer, searching through the cv2.__dict__ dictionary:

for option in cv2.__dict__:
    if 'CORREL' in option:
        print option

I find cv2.HISTCMP_CORREL.

answered Feb 13 '17 at 14:03

Aidenhjj

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compare histogram comparison method isn't working in opencv 3.1.0

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