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79 lines
2.5 KiB
Python
79 lines
2.5 KiB
Python
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import numpy as np
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import cv2, cv
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help_message = '''
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USAGE: watershed.py [<image>]
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Use keys 1 - 7 to switch marker color
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SPACE - update segmentation
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r - reset
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a - switch autoupdate
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ESC - exit
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'''
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class App:
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def __init__(self, fn):
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self.img = cv2.imread(fn)
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h, w = self.img.shape[:2]
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self.markers = np.zeros((h, w), np.int32)
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self.markers_vis = self.img.copy()
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self.cur_marker = 1
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self.colors = np.int32( list(np.ndindex(2, 2, 2)) ) * 255
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cv2.imshow('img', self.markers_vis)
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self.prev_pt = None
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self.need_update = False
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self.auto_update = True
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cv2.setMouseCallback('img', self.onmouse)
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def onmouse(self, event, x, y, flags, param):
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pt = (x, y)
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if event == cv.CV_EVENT_LBUTTONDOWN:
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self.prev_pt = pt
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if self.prev_pt and flags & cv.CV_EVENT_FLAG_LBUTTON:
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color = map(int, self.colors[self.cur_marker])
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cv.Line(self.markers, self.prev_pt, pt, self.cur_marker, 5)
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cv.Line(self.markers_vis, self.prev_pt, pt, color, 5)
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self.need_update = True
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self.prev_pt = pt
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cv2.imshow('img', self.markers_vis)
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else:
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self.prev_pt = None
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def watershed(self):
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m = self.markers.copy()
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cv2.watershed(self.img, m)
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vis = np.uint8( (self.img + self.colors[np.maximum(m, 0)]) / 2 )
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cv2.imshow('watershed', vis)
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self.need_update = False
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def run(self):
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while True:
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ch = cv2.waitKey(10)
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if ch == 27:
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break
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if ch >= ord('1') and ch <= ord('7'):
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self.cur_marker = ch - ord('0')
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print 'marker: ', self.cur_marker
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if ch == ord(' ') or (self.need_update and self.auto_update):
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self.watershed()
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if ch in [ord('a'), ord('A')]:
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self.auto_update = not self.auto_update
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print 'auto_update if', ['off', 'on'][self.auto_update]
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if ch in [ord('r'), ord('R')]:
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self.markers = np.zeros(self.img.shape[:2], np.int32)
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self.markers_vis = self.img.copy()
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cv2.imshow('img', self.markers_vis)
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cv2.destroyWindow('watershed')
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if __name__ == '__main__':
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import sys
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try: fn = sys.argv[1]
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except: fn = '../cpp/fruits.jpg'
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print help_message
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App(fn).run()
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