72 lines
2.0 KiB
Python
Executable File
72 lines
2.0 KiB
Python
Executable File
#!/usr/bin/python
|
|
import sys
|
|
import cv
|
|
import urllib2
|
|
|
|
wndname = "Distance transform"
|
|
tbarname = "Threshold"
|
|
|
|
# The output images
|
|
dist = 0
|
|
dist8u1 = 0
|
|
dist8u2 = 0
|
|
dist8u = 0
|
|
dist32s = 0
|
|
|
|
gray = 0
|
|
edge = 0
|
|
|
|
# define a trackbar callback
|
|
def on_trackbar(edge_thresh):
|
|
|
|
cv.Threshold(gray, edge, float(edge_thresh), float(edge_thresh), cv.CV_THRESH_BINARY)
|
|
#Distance transform
|
|
cv.DistTransform(edge, dist, cv.CV_DIST_L2, cv.CV_DIST_MASK_5)
|
|
|
|
cv.ConvertScale(dist, dist, 5000.0, 0)
|
|
cv.Pow(dist, dist, 0.5)
|
|
|
|
cv.ConvertScale(dist, dist32s, 1.0, 0.5)
|
|
cv.AndS(dist32s, cv.ScalarAll(255), dist32s, None)
|
|
cv.ConvertScale(dist32s, dist8u1, 1, 0)
|
|
cv.ConvertScale(dist32s, dist32s, -1, 0)
|
|
cv.AddS(dist32s, cv.ScalarAll(255), dist32s, None)
|
|
cv.ConvertScale(dist32s, dist8u2, 1, 0)
|
|
cv.Merge(dist8u1, dist8u2, dist8u2, None, dist8u)
|
|
cv.ShowImage(wndname, dist8u)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
edge_thresh = 100
|
|
|
|
if len(sys.argv) > 1:
|
|
gray = cv.LoadImage(sys.argv[1], cv.CV_LOAD_IMAGE_GRAYSCALE)
|
|
else:
|
|
url = 'https://code.ros.org/svn/opencv/trunk/opencv/samples/c/stuff.jpg'
|
|
filedata = urllib2.urlopen(url).read()
|
|
imagefiledata = cv.CreateMatHeader(1, len(filedata), cv.CV_8UC1)
|
|
cv.SetData(imagefiledata, filedata, len(filedata))
|
|
gray = cv.DecodeImage(imagefiledata, cv.CV_LOAD_IMAGE_GRAYSCALE)
|
|
|
|
# Create the output image
|
|
dist = cv.CreateImage((gray.width, gray.height), cv.IPL_DEPTH_32F, 1)
|
|
dist8u1 = cv.CloneImage(gray)
|
|
dist8u2 = cv.CloneImage(gray)
|
|
dist8u = cv.CreateImage((gray.width, gray.height), cv.IPL_DEPTH_8U, 3)
|
|
dist32s = cv.CreateImage((gray.width, gray.height), cv.IPL_DEPTH_32S, 1)
|
|
|
|
# Convert to grayscale
|
|
edge = cv.CloneImage(gray)
|
|
|
|
# Create a window
|
|
cv.NamedWindow(wndname, 1)
|
|
|
|
# create a toolbar
|
|
cv.CreateTrackbar(tbarname, wndname, edge_thresh, 255, on_trackbar)
|
|
|
|
# Show the image
|
|
on_trackbar(edge_thresh)
|
|
|
|
# Wait for a key stroke; the same function arranges events processing
|
|
cv.WaitKey(0)
|