Open Source Computer Vision Library https://opencv.org/
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#!/usr/bin/python
from opencv.cv import *
from opencv.highgui import *
import sys
if __name__ == "__main__":
cvNamedWindow("win")
filename = sys.argv[1]
im = cvLoadImage(filename, CV_LOAD_IMAGE_GRAYSCALE)
im3 = cvLoadImage(filename, CV_LOAD_IMAGE_COLOR)
chessboard_dim = cvSize( 5, 6 )
found_all, corners = cvFindChessboardCorners( im, chessboard_dim )
cvDrawChessboardCorners( im3, chessboard_dim, corners, found_all )
cvShowImage("win", im3);
cvWaitKey()