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	<title>Comments on: How To: Perform Real-Time OpenCV Edge Detection on a WebCam Stream</title>
	<atom:link href="http://r3dux.org/2010/11/how-to-perform-real-time-opencv-edge-detection-o-a-webcam-stream/feed/" rel="self" type="application/rss+xml" />
	<link>http://r3dux.org/2010/11/how-to-perform-real-time-opencv-edge-detection-o-a-webcam-stream/?utm_source=rss&#038;utm_medium=rss&#038;utm_campaign=how-to-perform-real-time-opencv-edge-detection-o-a-webcam-stream</link>
	<description>A number-pimping side project from the valleys in *NEW* upside-down flavour.</description>
	<lastBuildDate>Mon, 13 May 2013 03:00:11 +0000</lastBuildDate>
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		<title>By: r3dux</title>
		<link>http://r3dux.org/2010/11/how-to-perform-real-time-opencv-edge-detection-o-a-webcam-stream/#comment-11045</link>
		<dc:creator>r3dux</dc:creator>
		<pubDate>Fri, 12 Apr 2013 09:05:34 +0000</pubDate>
		<guid isPermaLink="false">http://r3dux.org/?p=3565#comment-11045</guid>
		<description><![CDATA[You&#039;re welcome! Are you using skeletal tracking for the virtual avatar? Easily done through Kinect frameworks (official MS, OpenNI, Skeltrack etc.).]]></description>
		<content:encoded><![CDATA[<p>You&#8217;re welcome! Are you using skeletal tracking for the virtual avatar? Easily done through Kinect frameworks (official MS, OpenNI, Skeltrack etc.).</p>
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	<item>
		<title>By: domy</title>
		<link>http://r3dux.org/2010/11/how-to-perform-real-time-opencv-edge-detection-o-a-webcam-stream/#comment-11023</link>
		<dc:creator>domy</dc:creator>
		<pubDate>Thu, 11 Apr 2013 18:38:46 +0000</pubDate>
		<guid isPermaLink="false">http://r3dux.org/?p=3565#comment-11023</guid>
		<description><![CDATA[great piece of work and thanks for the code....thank you so much....i am working on virtual avatar imitating human action....still much of work left....if you could help with my topic that would be great....anyway thank you so much for this part!!]]></description>
		<content:encoded><![CDATA[<p>great piece of work and thanks for the code&#8230;.thank you so much&#8230;.i am working on virtual avatar imitating human action&#8230;.still much of work left&#8230;.if you could help with my topic that would be great&#8230;.anyway thank you so much for this part!!</p>
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		<title>By: r3dux</title>
		<link>http://r3dux.org/2010/11/how-to-perform-real-time-opencv-edge-detection-o-a-webcam-stream/#comment-8928</link>
		<dc:creator>r3dux</dc:creator>
		<pubDate>Sun, 30 Dec 2012 06:28:20 +0000</pubDate>
		<guid isPermaLink="false">http://r3dux.org/?p=3565#comment-8928</guid>
		<description><![CDATA[There&#039;s some great code to recognise things in a project called OpenTLD: &lt;a href=&quot;http://gnebehay.github.com/OpenTLD/&quot;&gt;http://gnebehay.github.com/OpenTLD/&lt;/a&gt;.

I&#039;ve integrated this with the Kinect a little to get distances of things like &quot;three-finger-pinches&quot;, but it&#039;s all still pretty rough atm:
&lt;a href=&quot;http://www.youtube.com/watch?v=WAmhdNVKVyU&quot;&gt;http://www.youtube.com/watch?v=WAmhdNVKVyU&lt;/a&gt;]]></description>
		<content:encoded><![CDATA[<p>There&#8217;s some great code to recognise things in a project called OpenTLD: <a href="http://gnebehay.github.com/OpenTLD/">http://gnebehay.github.com/OpenTLD/</a>.</p>
<p>I&#8217;ve integrated this with the Kinect a little to get distances of things like &#8220;three-finger-pinches&#8221;, but it&#8217;s all still pretty rough atm:<br />
<a href="http://www.youtube.com/watch?v=WAmhdNVKVyU">http://www.youtube.com/watch?v=WAmhdNVKVyU</a></p>
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	<item>
		<title>By: Sriram</title>
		<link>http://r3dux.org/2010/11/how-to-perform-real-time-opencv-edge-detection-o-a-webcam-stream/#comment-8908</link>
		<dc:creator>Sriram</dc:creator>
		<pubDate>Fri, 28 Dec 2012 18:53:15 +0000</pubDate>
		<guid isPermaLink="false">http://r3dux.org/?p=3565#comment-8908</guid>
		<description><![CDATA[Good piece of work...

Am working on the gesture recognition you mentioned....
Did you complete it?

If yes, it will give me ideas to improve upon!!!
And nice photo by the  way! :)]]></description>
		<content:encoded><![CDATA[<p>Good piece of work&#8230;</p>
<p>Am working on the gesture recognition you mentioned&#8230;.<br />
Did you complete it?</p>
<p>If yes, it will give me ideas to improve upon!!!<br />
And nice photo by the  way! <img src='http://r3dux.org/wp-includes/images/smilies/icon_smile.gif' alt=':)' class='wp-smiley' /> </p>
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		<title>By: Yogendra</title>
		<link>http://r3dux.org/2010/11/how-to-perform-real-time-opencv-edge-detection-o-a-webcam-stream/#comment-7619</link>
		<dc:creator>Yogendra</dc:creator>
		<pubDate>Wed, 04 Apr 2012 13:44:26 +0000</pubDate>
		<guid isPermaLink="false">http://r3dux.org/?p=3565#comment-7619</guid>
		<description><![CDATA[Hi,

Yes i did previously i was using opencv 2.1 now this program i used with opencv 2.3 but same result. and i have right now USB camera,because of that it may not showing values 2marrow i will try with my inbuilt cam then i will inform you and thanks a lot to reply me.]]></description>
		<content:encoded><![CDATA[<p>Hi,</p>
<p>Yes i did previously i was using opencv 2.1 now this program i used with opencv 2.3 but same result. and i have right now USB camera,because of that it may not showing values 2marrow i will try with my inbuilt cam then i will inform you and thanks a lot to reply me.</p>
]]></content:encoded>
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	<item>
		<title>By: r3dux</title>
		<link>http://r3dux.org/2010/11/how-to-perform-real-time-opencv-edge-detection-o-a-webcam-stream/#comment-7617</link>
		<dc:creator>r3dux</dc:creator>
		<pubDate>Wed, 04 Apr 2012 13:05:31 +0000</pubDate>
		<guid isPermaLink="false">http://r3dux.org/?p=3565#comment-7617</guid>
		<description><![CDATA[I was only thinking to wait a few frames, not 5 mins  - but it&#039;s all good ;)

The only other thing to try might be to get the latest OpenCV, or build a copy from the &lt;a href=&quot;http://opencv.willowgarage.com/wiki/InstallGuide&quot;&gt;OpenCV subversion source&lt;/a&gt;, or maybe try a different webcam (like a USB one instead of a built-in one).]]></description>
		<content:encoded><![CDATA[<p>I was only thinking to wait a few frames, not 5 mins  &#8211; but it&#8217;s all good <img src='http://r3dux.org/wp-includes/images/smilies/icon_wink.gif' alt=';)' class='wp-smiley' /> </p>
<p>The only other thing to try might be to get the latest OpenCV, or build a copy from the <a href="http://opencv.willowgarage.com/wiki/InstallGuide">OpenCV subversion source</a>, or maybe try a different webcam (like a USB one instead of a built-in one).</p>
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		<title>By: Yogendra</title>
		<link>http://r3dux.org/2010/11/how-to-perform-real-time-opencv-edge-detection-o-a-webcam-stream/#comment-7616</link>
		<dc:creator>Yogendra</dc:creator>
		<pubDate>Wed, 04 Apr 2012 12:56:19 +0000</pubDate>
		<guid isPermaLink="false">http://r3dux.org/?p=3565#comment-7616</guid>
		<description><![CDATA[Hi r3dux,

Thanks to reply me i tried as you told i put these all statement in main loop and wait for 5 min.
but still same result as 0. but when i put CV_CAP_ANY at place of CV_CAP_V4L2 then i got only frame width and height and all the remaining values i am getting same as previous one result means 0.]]></description>
		<content:encoded><![CDATA[<p>Hi r3dux,</p>
<p>Thanks to reply me i tried as you told i put these all statement in main loop and wait for 5 min.<br />
but still same result as 0. but when i put CV_CAP_ANY at place of CV_CAP_V4L2 then i got only frame width and height and all the remaining values i am getting same as previous one result means 0.</p>
]]></content:encoded>
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	<item>
		<title>By: r3dux</title>
		<link>http://r3dux.org/2010/11/how-to-perform-real-time-opencv-edge-detection-o-a-webcam-stream/#comment-7615</link>
		<dc:creator>r3dux</dc:creator>
		<pubDate>Wed, 04 Apr 2012 08:06:57 +0000</pubDate>
		<guid isPermaLink="false">http://r3dux.org/?p=3565#comment-7615</guid>
		<description><![CDATA[It just works for me using the code above. Maybe your cam takes a little longer to initialise so it hasn&#039;t processed the first frame before trying to get the image properties... Try putting the following in the main loop and see they still come out as 0:

&lt;pre lang=&quot;cpp&quot;&gt;
cout &lt;&lt; &quot;Image brightness: &quot; &lt;&lt; cvGetCaptureProperty(pCapture, CV_CAP_PROP_BRIGHTNESS) &lt;&lt; endl;
cout &lt;&lt; &quot;Image contrast: &quot; &lt;&lt; cvGetCaptureProperty(pCapture, CV_CAP_PROP_CONTRAST) &lt;&lt; endl;
cout &lt;&lt; &quot;Image saturation: &quot; &lt;&lt; cvGetCaptureProperty(pCapture, CV_CAP_PROP_SATURATION) &lt;&lt; endl;
cout &lt;&lt; &quot;Image hue: &quot; &lt;&lt; cvGetCaptureProperty(pCapture, CV_CAP_PROP_HUE) &lt;&lt; endl;
&lt;/pre&gt;

As I don&#039;t know whether OpenCV gets these properties from the hardware or calculates them itself, another possibility is that it&#039;s a camera-chipset related issue, and those properties simply aren&#039;t available from your webcam&#039;s hardware.

Hope this helps.]]></description>
		<content:encoded><![CDATA[<p>It just works for me using the code above. Maybe your cam takes a little longer to initialise so it hasn&#8217;t processed the first frame before trying to get the image properties&#8230; Try putting the following in the main loop and see they still come out as 0:</p>

<div class="wp_syntax"><table><tr><td class="code"><pre class="cpp" style="font-family:monospace;"><span style="color: #0000dd;">cout</span> <span style="color: #000080;">&lt;&lt;</span> <span style="color: #FF0000;">&quot;Image brightness: &quot;</span> <span style="color: #000080;">&lt;&lt;</span> cvGetCaptureProperty<span style="color: #008000;">&#40;</span>pCapture, CV_CAP_PROP_BRIGHTNESS<span style="color: #008000;">&#41;</span> <span style="color: #000080;">&lt;&lt;</span> endl<span style="color: #008080;">;</span>
<span style="color: #0000dd;">cout</span> <span style="color: #000080;">&lt;&lt;</span> <span style="color: #FF0000;">&quot;Image contrast: &quot;</span> <span style="color: #000080;">&lt;&lt;</span> cvGetCaptureProperty<span style="color: #008000;">&#40;</span>pCapture, CV_CAP_PROP_CONTRAST<span style="color: #008000;">&#41;</span> <span style="color: #000080;">&lt;&lt;</span> endl<span style="color: #008080;">;</span>
<span style="color: #0000dd;">cout</span> <span style="color: #000080;">&lt;&lt;</span> <span style="color: #FF0000;">&quot;Image saturation: &quot;</span> <span style="color: #000080;">&lt;&lt;</span> cvGetCaptureProperty<span style="color: #008000;">&#40;</span>pCapture, CV_CAP_PROP_SATURATION<span style="color: #008000;">&#41;</span> <span style="color: #000080;">&lt;&lt;</span> endl<span style="color: #008080;">;</span>
<span style="color: #0000dd;">cout</span> <span style="color: #000080;">&lt;&lt;</span> <span style="color: #FF0000;">&quot;Image hue: &quot;</span> <span style="color: #000080;">&lt;&lt;</span> cvGetCaptureProperty<span style="color: #008000;">&#40;</span>pCapture, CV_CAP_PROP_HUE<span style="color: #008000;">&#41;</span> <span style="color: #000080;">&lt;&lt;</span> endl<span style="color: #008080;">;</span></pre></td></tr></table></div>

<p>As I don&#8217;t know whether OpenCV gets these properties from the hardware or calculates them itself, another possibility is that it&#8217;s a camera-chipset related issue, and those properties simply aren&#8217;t available from your webcam&#8217;s hardware.</p>
<p>Hope this helps.</p>
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		<title>By: Yogendra</title>
		<link>http://r3dux.org/2010/11/how-to-perform-real-time-opencv-edge-detection-o-a-webcam-stream/#comment-7614</link>
		<dc:creator>Yogendra</dc:creator>
		<pubDate>Wed, 04 Apr 2012 07:17:01 +0000</pubDate>
		<guid isPermaLink="false">http://r3dux.org/?p=3565#comment-7614</guid>
		<description><![CDATA[Hi,

As i try your code its very nice, but there in my code i am trying to get camera Brightness,and Contrast as you are trying to print, but i am getting all the 0 value. how you are getting these values?]]></description>
		<content:encoded><![CDATA[<p>Hi,</p>
<p>As i try your code its very nice, but there in my code i am trying to get camera Brightness,and Contrast as you are trying to print, but i am getting all the 0 value. how you are getting these values?</p>
]]></content:encoded>
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	<item>
		<title>By: r3dux</title>
		<link>http://r3dux.org/2010/11/how-to-perform-real-time-opencv-edge-detection-o-a-webcam-stream/#comment-6819</link>
		<dc:creator>r3dux</dc:creator>
		<pubDate>Sat, 25 Jun 2011 00:22:57 +0000</pubDate>
		<guid isPermaLink="false">http://r3dux.org/?p=3565#comment-6819</guid>
		<description><![CDATA[The girl in the picture isn&#039;t me, it&#039;s my 13 year old step-daughter. Glad you found the code useful tho...]]></description>
		<content:encoded><![CDATA[<p>The girl in the picture isn&#8217;t me, it&#8217;s my 13 year old step-daughter. Glad you found the code useful tho&#8230;</p>
]]></content:encoded>
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