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.
38 lines
1.0 KiB
38 lines
1.0 KiB
''' |
|
browse.py shows how to implement a simple hi resolution image navigation |
|
''' |
|
|
|
import numpy as np |
|
import cv2 |
|
import sys |
|
|
|
print 'This sample shows how to implement a simple hi resolution image navigation.' |
|
print 'USAGE: browse.py [image filename]' |
|
print |
|
|
|
if len(sys.argv) > 1: |
|
fn = sys.argv[1] |
|
print 'loading %s ...' % fn |
|
img = cv2.imread(fn) |
|
else: |
|
sz = 4096 |
|
print 'generating %dx%d procedural image ...' % (sz, sz) |
|
img = np.zeros((sz, sz), np.uint8) |
|
track = np.cumsum(np.random.rand(500000, 2)-0.5, axis=0) |
|
track = np.int32(track*10 + (sz/2, sz/2)) |
|
cv2.polylines(img, [track], 0, 255, 1, cv2.CV_AA) |
|
|
|
small = img |
|
for i in xrange(3): |
|
small = cv2.pyrDown(small) |
|
|
|
def onmouse(event, x, y, flags, param): |
|
h, w = img.shape[:2] |
|
h1, w1 = small.shape[:2] |
|
x, y = 1.0*x*h/h1, 1.0*y*h/h1 |
|
zoom = cv2.getRectSubPix(img, (800, 600), (x+0.5, y+0.5)) |
|
cv2.imshow('zoom', zoom) |
|
|
|
cv2.imshow('preview', small) |
|
cv2.setMouseCallback('preview', onmouse, None) |
|
cv2.waitKey()
|
|
|