opencv/samples/python/laplace.py

#!/usr/bin/python
import urllib2
import cv2.cv as cv
import sys

if __name__ == "__main__":
    laplace = None
    colorlaplace = None
    planes = [ None, None, None ]
    capture = None
    
    if len(sys.argv) == 1:
        capture = cv.CreateCameraCapture(0)
    elif len(sys.argv) == 2 and sys.argv[1].isdigit():
        capture = cv.CreateCameraCapture(int(sys.argv[1]))
    elif len(sys.argv) == 2:
        capture = cv.CreateFileCapture(sys.argv[1]) 

    if not capture:
        print "Could not initialize capturing..."
        sys.exit(-1)
        
    cv.NamedWindow("Laplacian", 1)

    while True:
        frame = cv.QueryFrame(capture)
        if frame:
            if not laplace:
                planes = [cv.CreateImage((frame.width, frame.height), 8, 1) for i in range(3)]
                laplace = cv.CreateImage((frame.width, frame.height), cv.IPL_DEPTH_16S, 1)
                colorlaplace = cv.CreateImage((frame.width, frame.height), 8, 3)

            cv.Split(frame, planes[0], planes[1], planes[2], None)
            for plane in planes:
                cv.Laplace(plane, laplace, 3)
                cv.ConvertScaleAbs(laplace, plane, 1, 0)

            cv.Merge(planes[0], planes[1], planes[2], None, colorlaplace)

            cv.ShowImage("Laplacian", colorlaplace)

        if cv.WaitKey(10) != -1:
            break

    cv.DestroyWindow("Laplacian")