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Open Source Computer Vision Library
https://opencv.org/
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52 lines
1.2 KiB
52 lines
1.2 KiB
7 years ago
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import sys
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import cv2
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def main(argv):
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print("""
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Zoom In-Out demo
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------------------
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* [i] -> Zoom [i]n
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* [o] -> Zoom [o]ut
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* [ESC] -> Close program
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""")
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## [load]
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filename = argv[0] if len(argv) > 0 else "../data/chicky_512.png"
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# Load the image
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src = cv2.imread(filename)
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# Check if image is loaded fine
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if src is None:
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print ('Error opening image!')
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print ('Usage: pyramids.py [image_name -- default ../data/chicky_512.png] \n')
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return -1
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## [load]
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## [loop]
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while 1:
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rows, cols, _channels = map(int, src.shape)
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## [show_image]
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cv2.imshow('Pyramids Demo', src)
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## [show_image]
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k = cv2.waitKey(0)
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if k == 27:
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break
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## [pyrup]
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elif chr(k) == 'i':
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src = cv2.pyrUp(src, dstsize=(2 * cols, 2 * rows))
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print ('** Zoom In: Image x 2')
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## [pyrup]
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## [pyrdown]
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elif chr(k) == 'o':
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src = cv2.pyrDown(src, dstsize=(cols // 2, rows // 2))
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print ('** Zoom Out: Image / 2')
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## [pyrdown]
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## [loop]
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cv2.destroyAllWindows()
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return 0
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if __name__ == "__main__":
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main(sys.argv[1:])
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