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- #!/usr/bin/env python
- '''
- browse.py
- =========
- Sample shows how to implement a simple hi resolution image navigation
- Usage
- -----
- browse.py [image filename]
- '''
- # Python 2/3 compatibility
- from __future__ import print_function
- import sys
- PY3 = sys.version_info[0] == 3
- if PY3:
- xrange = range
- import numpy as np
- import cv2
- # built-in modules
- import sys
- if __name__ == '__main__':
- print('This sample shows how to implement a simple hi resolution image navigation.')
- print('USAGE: browse.py [image filename]')
- print()
- if len(sys.argv) > 1:
- fn = sys.argv[1]
- print('loading %s ...' % fn)
- img = cv2.imread(fn)
- if img is None:
- print('Failed to load fn:', fn)
- sys.exit(1)
- else:
- sz = 4096
- print('generating %dx%d procedural image ...' % (sz, sz))
- img = np.zeros((sz, sz), np.uint8)
- track = np.cumsum(np.random.rand(500000, 2)-0.5, axis=0)
- track = np.int32(track*10 + (sz/2, sz/2))
- cv2.polylines(img, [track], 0, 255, 1, cv2.LINE_AA)
- small = img
- for i in xrange(3):
- small = cv2.pyrDown(small)
- def onmouse(event, x, y, flags, param):
- h, w = img.shape[:2]
- h1, w1 = small.shape[:2]
- x, y = 1.0*x*h/h1, 1.0*y*h/h1
- zoom = cv2.getRectSubPix(img, (800, 600), (x+0.5, y+0.5))
- cv2.imshow('zoom', zoom)
- cv2.imshow('preview', small)
- cv2.setMouseCallback('preview', onmouse)
- cv2.waitKey()
- cv2.destroyAllWindows()
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