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66 lines
1.5 KiB
Python
Executable File
66 lines
1.5 KiB
Python
Executable File
#!/usr/bin/env python
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'''
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browse.py
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=========
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Sample shows how to implement a simple hi resolution image navigation
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Usage
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-----
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browse.py [image filename]
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'''
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# Python 2/3 compatibility
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from __future__ import print_function
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import sys
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PY3 = sys.version_info[0] == 3
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if PY3:
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xrange = range
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import numpy as np
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import cv2 as cv
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# built-in modules
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import sys
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if __name__ == '__main__':
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print('This sample shows how to implement a simple hi resolution image navigation.')
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print('USAGE: browse.py [image filename]')
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print()
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if len(sys.argv) > 1:
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fn = cv.samples.findFile(sys.argv[1])
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print('loading %s ...' % fn)
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img = cv.imread(fn)
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if img is None:
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print('Failed to load fn:', fn)
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sys.exit(1)
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else:
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sz = 4096
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print('generating %dx%d procedural image ...' % (sz, sz))
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img = np.zeros((sz, sz), np.uint8)
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track = np.cumsum(np.random.rand(500000, 2)-0.5, axis=0)
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track = np.int32(track*10 + (sz/2, sz/2))
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cv.polylines(img, [track], 0, 255, 1, cv.LINE_AA)
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small = img
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for i in xrange(3):
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small = cv.pyrDown(small)
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def onmouse(event, x, y, flags, param):
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h, _w = img.shape[:2]
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h1, _w1 = small.shape[:2]
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x, y = 1.0*x*h/h1, 1.0*y*h/h1
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zoom = cv.getRectSubPix(img, (800, 600), (x+0.5, y+0.5))
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cv.imshow('zoom', zoom)
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cv.imshow('preview', small)
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cv.setMouseCallback('preview', onmouse)
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cv.waitKey()
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cv.destroyAllWindows()
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