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#/usr/bin/env python
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''' An example of Laplacian Pyramid construction and merging.
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Level : Intermediate
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Usage : python lappyr.py [<video source>]
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References:
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.54.299
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Alexander Mordvintsev 6/10/12
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'''
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import numpy as np
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import cv2
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import video
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from common import nothing, getsize
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def build_lappyr(img, leveln=6, dtype=np.int16):
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img = dtype(img)
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levels = []
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for i in xrange(leveln-1):
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next_img = cv2.pyrDown(img)
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img1 = cv2.pyrUp(next_img, dstsize=getsize(img))
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levels.append(img-img1)
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img = next_img
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levels.append(img)
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return levels
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def merge_lappyr(levels):
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img = levels[-1]
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for lev_img in levels[-2::-1]:
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img = cv2.pyrUp(img, dstsize=getsize(lev_img))
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img += lev_img
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return np.uint8(np.clip(img, 0, 255))
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if __name__ == '__main__':
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import sys
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print __doc__
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try: fn = sys.argv[1]
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except: fn = 0
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cap = video.create_capture(fn)
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leveln = 6
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cv2.namedWindow('level control')
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for i in xrange(leveln):
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cv2.createTrackbar('%d'%i, 'level control', 5, 50, nothing)
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while True:
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ret, frame = cap.read()
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pyr = build_lappyr(frame, leveln)
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for i in xrange(leveln):
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v = cv2.getTrackbarPos('%d'%i, 'level control') / 5
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pyr[i] *= v
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res = merge_lappyr(pyr)
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cv2.imshow('laplacian pyramid filter', res)
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if cv2.waitKey(1) == 27:
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break
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