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