# openCV and ruby

**URL:** <https://www.ruby-forum.com/t/opencv-and-ruby/186310>\
**Category:** Ruby\
**Created:** [April 4, 2010, 9:49am UTC](https://www.ruby-forum.com/t/opencv-and-ruby/186310 "2010-04-04T09:49:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![sepehr](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@sepehr](https://www.ruby-forum.com/u/sepehr)\
**Post date:** [April 4, 2010, 9:49am UTC](https://www.ruby-forum.com/t/opencv-and-ruby/186310/1 "2010-04-04T09:49:05Z")

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I’ve installed OpenCV image processing library and when I try to install  
opencv gem(using gem install opencv) for ruby I get the following error  
when building the library

iplimage.cpp: In function ‘VALUE mOpenCV::cIplImage::rb\_initialize(int,  
VALUE\*, VALUE)’:  
iplimage.cpp:91: error: ‘cvCvToIplDepth’ was not declared in this scope  
iplimage.cpp: In function ‘VALUE mOpenCV::cIplImage::new\_object(int,  
int, int)’:  
iplimage.cpp:228: error: ‘cvCvToIplDepth’ was not declared in this scope  
iplimage.cpp: In function ‘VALUE mOpenCV::cIplImage::new\_object(CvSize,  
int)’:  
iplimage.cpp:234: error: ‘cvCvToIplDepth’ was not declared in this scope

has anybody managed to use opencv for ruby?

---

<div class="post-metadata">

**Author:** ![sepehr](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@sepehr](https://www.ruby-forum.com/u/sepehr)\
**Post date:** [April 16, 2010, 10:21am UTC](https://www.ruby-forum.com/t/opencv-and-ruby/186310/2 "2010-04-16T10:21:47Z")

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Mehdi K. wrote:

> iplimage.cpp: In function ‘VALUE mOpenCV::cIplImage::new\_object(CvSize,  
> int)’:  
> iplimage.cpp:234: error: ‘cvCvToIplDepth’ was not declared in this scope
> 
> has anybody managed to use opencv for ruby?

Try this patch:  
[http://blog.rikiji.it/me/entry/17](http://blog.rikiji.it/me/entry/17)