samples/python/snippets/mser.py

An example using Maximally stable extremal region(MSER) extractor in python

#!/usr/bin/env python
 
'''
MSER detector demo
==================
 
Usage:
------
    mser.py [<video source>]
 
Keys:
-----
    ESC   - exit
 
'''
 
# Python 2/3 compatibility
from __future__ import print_function
 
import numpy as np
import cv2 as cv
 
import video
import sys
 
def main():
    try:
        video_src = sys.argv[1]
    except:
        video_src = 0
 
    cam = video.create_capture(video_src)
    mser = cv.MSER_create()
 
    while True:
        ret, img = cam.read()
        if ret == 0:
            break
        gray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
        vis = img.copy()
 
        regions, _ = mser.detectRegions(gray)
        hulls = [cv.convexHull(p.reshape(-1, 1, 2)) for p in regions]
        cv.polylines(vis, hulls, 1, (0, 255, 0))
 
        cv.imshow('img', vis)
        if cv.waitKey(5) == 27:
            break
 
    print('Done')
 
 
if __name__ == '__main__':
    print(__doc__)
    main()
    cv.destroyAllWindows()