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Asked: 2026-06-15T15:33:43+00:00

I was wondering how to use cvCanny with ruby-opencv. I couldn’t find any proper

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I was wondering how to use cvCanny with ruby-opencv. I couldn’t find any proper documentation.
That’s what I have to far…

require "rubygems"
require "opencv"
include OpenCV

original_window = GUI::Window.new "original"
hough_window = GUI::Window.new "hough circles"

image = IplImage::load "stuff.jpg"
gray = image.canny(0.3, 0.8)

hough_window.show gray
GUI::wait_key

Error:

$ ruby houghcircle.rb
houghcircle.rb:11:in `canny': /Users/someuser/Development/Workspaces/2012/Libs/OpenCV-2.4.3/modules/imgproc/src/canny.cpp:282: error: (-215) src.size == dst.size && src.depth() == CV_8U && dst.type() == CV_8U in function cvCanny (OpenCV::CvStsAssert)
    from houghcircle.rb:11
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1 Answer

  1. Editorial Team
    error: (-215) src.size == dst.size && src.depth() == CV_8U && dst.type() == CV_8U in function cvCanny (OpenCV::CvStsAssert)

    That’s because you should convert image to grayscale (single-channel image) using cvtColor with parameter CV_BGR2GRAY. Canny can be applied only to such images.

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