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#!/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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import numpy as np
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import cv2
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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 = sys.argv[1]
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print 'loading %s ...' % fn
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img = cv2.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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cv2.polylines(img, [track], 0, 255, 1, cv2.LINE_AA)
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small = img
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for i in xrange(3):
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small = cv2.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 = cv2.getRectSubPix(img, (800, 600), (x+0.5, y+0.5))
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cv2.imshow('zoom', zoom)
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cv2.imshow('preview', small)
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cv2.setMouseCallback('preview', onmouse)
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cv2.waitKey()
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cv2.destroyAllWindows()
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