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