Android :: Opencv CvCanny Link Error
Oct 4, 2010
I'm using android-opencv (android-opencv -- http://code.google.com/p/android-opencv/ -- ) , it was built successfully and worked like charm.
Then I tried to use "cvCanny" to detect faces but the linker reported an error "undefined reference".
CODE:...................
compile command
CODE:.............
When I inspect "libimgproc.a" with "nm" command, it says it has the symbol of "cvCanny" , but the linker complains ...
CODE:.........................
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Sep 14, 2010
I'm am working on a basic augmented reality application on Android. What I did so far is detect a square with opencv and then using cvFindExtrinsicCameraParams2() I calculated a rotation and translation vector. For this I used 4 object points, which are just the corners of a square around (0,0,0) and the 4 corners of the square in the image.
This yields me a pretty good rotation and translation matrix. I also calculated the rotation matrix with cvRodrigues2() since using this is easier than the rotation vector. As long as I use these to draw some points in the image everything works fine. My next step is however to pass these vectors and the matrix back to java and then use them with OpenGL to draw a square in an OpenGLView. The square should be exactly around the square in the image which is displayed behind the OpenGLView.
My problem is that I cannot find the correct way of using the rotation matrix and translation vector in OpenGL. I started of with exactly the same object points as used for the openCV functions. Then I applied the rotation matrix and translation vector in pretty much any possible way I could think of. Sadly none of these approaches produce a result which is anyway near what I hoped for. So my question is can anyone tell me how to use them correctly?
So far the "closest" results I have gotten, was when randomly multiplying the whole matrix with -1. But most of the time the squares still look mirror inverted or rotated for 180 degrees. So I guess it was just a lucky hit, but not the right approach.
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Sep 9, 2010
I need to use Cygwin to compile C++ code for an Android project. I'm having trouble compiling even a basic "hello world" program. The console gives me this message: /usr/lib/gcc/i686-pc-cygwin/4.3.4/../../../../i686-pc-cygwin/bin/ld: unrecognized -a option `ware'
I've googled the error and the only result I've found was an issue with one of the programs (I think it was binutils) being out of date, and was resolved when that program was updated. I downloaded the entirety of the Cygwin package at once, so I don't think that's the problem. The compiler and linker aren't communicating properly. How do I fix it without changing compilers?
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Sep 28, 2010
I'm interested in developing an android app that makes use of an OpenCV android port. Particularly, I want to use SURF features which comes embedded in the OpenCV framework but I'm not sure if then I will be able to sell this app. anyway, is there any non-free app making use of any of the OpenCV android ports?
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Jun 14, 2010
I have a WebView in my Android App that is loading an HTML string using the loadDataWithBaseURL() method. The problem is that local anchor links (<a href="#link">...) are not working correctly. When the link is clicked, it becomes highlighted, but does not scroll to the corresponding anchor.
This also does not work if I use the WebView's loadUrl() method to load a page that contains anchor links. However, if I load the same URL in the browser, the anchor links do work.
Is there any special handling required to get these to work for a WebView?
I am using API v4 (1.6).
There isn't much to the code, here are the relevant parts of some test code I've been working with:
CODE:...................
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May 5, 2010
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"Error: Server Error The server encountered an error and could not complete your request. If the problem persists, please report your problem and mention this error message and the query that caused it."
Anyone else have this issue when using Appbrain on their pc?
Well, It looks like I solved the problem. I just deleted my account and created it again and it's fixed (for now).
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May 26, 2010
The error "error parsing XML: unbound prefix" shows up on my main layout: main.xml when I first open Eclipse. To make the error go away, all I have to do is make a modification to the file, then undo it, then hit save (have to make a change in order to be able to save file and thus trigger the new syntax check).
My environment is:
Fedora Eclipse Platform
Version: 3.4.2
Based on build id: 20090211-1700
My target is Android API level 5.
The first time I saw the error I spent a long time trying to track down "the problem" but later realized there isn't really a problem, it's just a phantom error.
Screenshot: http://i50.tinypic.com/2i89iee.jpg
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May 21, 2010
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Apr 22, 2010
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Nov 15, 2010
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Jan 4, 2010
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and the code i have for the php is as follows ...
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Some code:.........................
This is the exception details:
"Neither user 10057 nor current process has android.permission.INSTALL_PACKAGES". and i have set in my main app that permission in the manifest.
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Nov 16, 2010
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