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68 lines
1.5 KiB
68 lines
1.5 KiB
#!/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: |
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fn = sys.argv[1] |
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except: |
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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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