Hi Friends,
Do you want to draw a histogram for an image as below?
See the histogram for above image for RGB channels.
The code:
You can see the same code written using numpy functions on histogram here : Drawing histogram in OpenCV- Python.
Don't forget to send your comments, doubts etc.
With Regards,
Abid Rahman K.
Do you want to draw a histogram for an image as below?
See the histogram for above image for RGB channels.
The code:
import cv2 import numpy as np img = cv2.imread('zzzyj.jpg') h = np.zeros((300,256,3)) bins = np.arange(256).reshape(256,1) color = [ (255,0,0),(0,255,0),(0,0,255) ] for ch, col in enumerate(color): hist_item = cv2.calcHist([img],[ch],None,[256],[0,256]) cv2.normalize(hist_item,hist_item,0,255,cv2.NORM_MINMAX) hist=np.int32(np.around(hist_item)) pts = np.column_stack((bins,hist)) cv2.polylines(h,[pts],False,col) h=np.flipud(h) cv2.imshow('colorhist',h) cv2.waitKey(0)
You can see the same code written using numpy functions on histogram here : Drawing histogram in OpenCV- Python.
Don't forget to send your comments, doubts etc.
With Regards,
Abid Rahman K.