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