Nagi | 27 Jun 18:36 2012
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License plate

I have a license plate image on the back of a car. I am trying to extract the license plate region. 
Here's a picture of the license plate:
http://postimage.org/image/qrikhj7v1/
I tried segmentation but the color of the car and license are too close to be able to segment. 
I tried Canny but I am getting  this:
http://postimage.org/image/77lji8cpj/

The whole square region of the license plate is not being drawn by Canny.

Anyone has a good idea how to get the whole license plate region?

Thanks,
Nagi

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paulal7489 | 26 Jun 16:11 2012

URGENT: Position of the center of a templ within the image

Hey everybody,

I wrote a program, that is working quite well so far. Mainly I apply matchTemplate, Canny and HoughLinesP.
After the matchTemplate function I also let the program calculate the center of the templ using rotation as
well as the center of the image. Now I wanna calculate the distence between the center of the image and the
center of the templ, but therefor I need to know the position of the templ-center within the image. Then I
would have two points within the image and could easily calculate the distance. Please, help me and give me
some advice.

cheers

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Arshad L | 26 Jun 21:38 2012
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*important everybody read*



hello to all friends

some time we seen some email that sent by member as Spam(it have random link).
to solve that problem you can change your password email.
then we dont see that spams in the Opencv group again 

thank you


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gamesforonetn | 26 Jun 22:21 2012
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Problem with gpu:add

Consider the following code:

cv::gpu::Stream gpuStream;
cv::gpu::GpuMat weightmaps_sum;
cv::Scalar number(1e-12);

cv::gpu::add(weightmaps_sum, number, weightmaps_sum, gpuStream);

Visual Studio 2010 generates the following error for OpenCV 2.4.0 and 2.4.1:

error C2665: 'cv::gpu::add' : none of the 2 overloads could convert all the argument types
          opencv2/gpu/gpu.hpp(464): could be 'void cv::gpu::add(const cv::gpu::GpuMat &,const
cv::gpu::GpuMat &,cv::gpu::GpuMat &,const cv::gpu::GpuMat &,int,cv::gpu::Stream &)'
          opencv2/gpu/gpu.hpp(466): or       'void cv::gpu::add(const cv::gpu::GpuMat &,const cv::Scalar
&,cv::gpu::GpuMat &,const cv::gpu::GpuMat &,int,cv::gpu::Stream &)'
         while trying to match the argument list '(cv::gpu::GpuMat, cv::Scalar, cv::gpu::GpuMat, cv::gpu::Stream)'

I do not understand why there is no match as the 2nd argument is clearly a cv::Scalar, which should specify
which to use.

Curiously this only fails when I specify the "gpuStream". If I simply omit gpuStream, it compiles fine.
Also, note that gpu::multiply uses a similar prototype construct and it accepts the Stream argument
without complaint.

---
Michael Mc

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achmad sofyan nugraha | 27 Jun 01:48 2012
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(unknown)



http://piyangokulubu.com/cinemabelief/Simon_Jones68/



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Esha | 26 Jun 19:45 2012
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(unknown)



http://iltayenerji.com.tr/browneveryone/Martin_Walker69/



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T.J. | 25 Jun 20:45 2012
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Which enviroment should a beginner use for openCV?

I am a new programmer who is trying to create CV programs for a school assignment. I have been using
codeblocks for most of my C++ programming so far, but decided to switch to Microsoft Visual Studio 2010
because I thought it might be a better IDE. I've had trouble getting both of these environments to
integrate with OpenCV, and most tutorials are for older versions. Is there a good place to start?

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Otávio Ribeiro Filho | 24 Jun 00:21 2012
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Installation error - include folder keep empty

Hi I've started with OpenCV, and I'm having a installation problem with it, my include folder doesn't have
the headers, and I'm always getting the error: "fatal error C1083: Cannot open include file:
'opencv2/core/core.hpp': No such file or directory" 

1 - Downloaded the 2.4.1 exe file from opencv site and extracted to a folder;

2 - Created a OpenCV2.4 folder to store the built opencv, and configured CMake generator as shown in the picture:
https://picasaweb.google.com/111109583585312826981/OpenCVInstallation?authkey=Gv1sRgCJC3yP3F1djbvQE#5757355833779530674

3 - Made the changes as following:
https://picasaweb.google.com/111109583585312826981/OpenCVInstallation?authkey=Gv1sRgCJC3yP3F1djbvQE#5757355833570085042

4 - Got the following files in OpenCV2.4/include folder:
https://picasaweb.google.com/111109583585312826981/OpenCVInstallation?authkey=Gv1sRgCJC3yP3F1djbvQE#5757355834386837314

5 - Built both Debug and Release and got these files(nothing change):
https://picasaweb.google.com/111109583585312826981/OpenCVInstallation?authkey=Gv1sRgCJC3yP3F1djbvQE#5757355846976699938

6 - Also got 0 error in build process, this is my output build file SS:
https://picasaweb.google.com/111109583585312826981/OpenCVInstallation?authkey=Gv1sRgCJC3yP3F1djbvQE#5757357025383458898

This is my output file: http://www.4shared.com/office/_RipgK-Q/Output-Build.html?

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luigues33 | 22 Jun 19:17 2012
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Problem building Qt Libraries

Hi all,
I'm using VS C++ Express 2010x86, Windows 7 (32 bits). But, When I start Visual Studio command prompt, I'm
having the following error: 

Setting environment for using Microsoft Visual Studio 2010x64 cross tools.
ERROR: Cannot determine the location of the VS Common Tools folder.

This error prevents the built Qt libraries? In my system variables section, the value of VS100COMNTOOLS is
not blank (C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\Tools\). How to solve this problem?

Thank you.

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the_edge123 | 25 Jun 10:11 2012
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HAAR iris detection

Hello,

I tried to build a classifier based on UBIRIS v1.
opencv_performance gives the following results:

                                     Hits |Missed| False
                           Total|  1808|   192|   772|

1) What can I deduce from the quality of the classifier ?

I tested it using this code:
  //-- Detect faces
  face_cascade.detectMultiScale( frame, faces, 1.1, 2, 0|CV_HAAR_SCALE_IMAGE, Size(30, 30) );

  for( int i = 0; i < faces.size(); i++ )
  {
    // Face detected
    Mat faceROI = frame( faces[i] );
    std::vector<Rect> eyes;

    //-- In each face, detect eyes
    eyes_cascade.detectMultiScale( faceROI, eyes, 1.1, 2, 0 |CV_HAAR_SCALE_IMAGE, Size(30, 30) );

    for( int j = 0; j < eyes.size(); j++ )
     {
        // Eye detected
       Mat eyeROI = frame( eyes[j] );
       std::vector<Rect> iris;
       // Cascade seems not good
       iris_cascade.detectMultiScale( eyeROI, iris, 1.1, 1, 0, Size(20, 20) );
       for( int k = 0; k < iris.size(); k++ )
       {
            // Iris detected

Even though I could detect my eyes, I could never detect any iris.

2) Is the code correct ?

Thanks in advance,
Fabien

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andrestoga | 25 Jun 02:03 2012
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Helping using the dilate function

Hi, in the following code I want to use the dilate function but I don't know how to cast a Mat class into a
InputArray and OutputArray. Can you help me?

Cheers,

#include "opencv2/opencv.hpp"

using namespace cv;

int main(int, char**)
{
	Mat edges;

    VideoCapture cap(0); // open the default camera
    if(!cap.isOpened())  // check if we succeeded
        return -1;

    for(;;)
    {

        Mat frame;
        cap >> frame; // get a new frame from camera
        cvtColor(frame, edges, CV_BGR2GRAY);
        GaussianBlur(edges, edges, Size(7,7), 1.5, 1.5);
        //dilate(edges,edges,NULL);
        Canny(edges, edges, 0, 30, 3);
        imshow("edges", frame);
        if(waitKey(30) >= 0) break;
    }
    // the camera will be deinitialized automatically in VideoCapture destructor
    return 0;
}

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Gmane