mirror of
https://github.com/ruby-opencv/ruby-opencv
synced 2023-03-27 23:22:12 -04:00
47 lines
1.2 KiB
Ruby
Executable file
47 lines
1.2 KiB
Ruby
Executable file
#!/usr/bin/env ruby
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# convexhull.rb
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# Draw contours and convexity defect points to captured image
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require "rubygems"
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require "opencv"
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include OpenCV
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window = GUI::Window.new("convexhull")
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capture = CvCapture::open
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accuracy = 1
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t = window.set_trackbar("accuracy", 10, 1) { |v|
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accuracy = v
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}
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circle_options = { :color => CvColor::Blue, :line_type => :aa, :thickness => -1 }
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loop do
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image = capture.query
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# Calculate contours from a binary image
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gray = image.BGR2GRAY
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bin = gray.threshold(0x44, 0xFF, :binary)
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contours = bin.find_contours
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while contours
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# Draw contours
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poly = contours.approx(:accuracy => accuracy)
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begin
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image.draw_contours!(poly, CvColor::Red, CvColor::Black, 2,
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:thickness => 2, :line_type => :aa)
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end while (poly = poly.h_next)
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# Draw convexity defects
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hull = contours.convex_hull2(true, false)
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contours.convexity_defects(hull).each { |cd|
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image.circle!(cd.start, 3, circle_options)
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image.circle!(cd.depth_point, 3, circle_options)
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image.circle!(cd.end, 3, circle_options)
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}
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contours = contours.h_next
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end
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window.show image
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exit if GUI::wait_key(1)
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end
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