mirror of https://github.com/opencv/opencv.git
Open Source Computer Vision Library
https://opencv.org/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
64 lines
1.4 KiB
64 lines
1.4 KiB
''' 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 |
|
|
|
|
|
|