Rizwan Bashir | 4 Jul 10:51 2012
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Detecting objects of multiple shapes and colors in a single frame

Dear All

I was successfully able to track a white colored ball. Using the cvMoments method I was able to find the x,y
coordinates of the ball using a code given below.

        CvMoments *moments = (CvMoments*)malloc(sizeof(CvMoments));
        cvMoments(imgThreshWhite, moments, 1);

        
        double moment10 = cvGetSpatialMoment(moments, 1, 0);
        double moment01 = cvGetSpatialMoment(moments, 0, 1);
        double area = cvGetCentralMoment(moments, 0, 0)

Now if I have a red colored rectangular object in the same frame as the ball, how can i find the x,y coordinates
of both these objects? I do not want to use cvBlobs library for this project.

Thanks
-Rizwan

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zshzsh12121 | 3 Jul 16:47 2012
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OPENCV on ETS

Hi Everyone:

I m working on an application which is calling a opencv DLL in a real time LABVIEW operating system. However,
according to the NI support guys, there are Windows specific calls or functions in OPENCV, so that the DLL
won't be supported by the LABVIEW ETS sytem. 

I am wondering if anyone did similar applications before? And if there is any OPENCV version is compatible
with ETS? Or how can I solve this problem?

I was thinking should I get into the source code and try to find the Window only functions and replace them
with something else. But I am not a computer guy, have no experience in this at all.

Thank you for any help,

Regards,

Hunter

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dcazzato85 | 3 Jul 18:24 2012
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stereo_match with general rectified images, very poor result

Hello everybody,

this is my first post in this group. Thank you to everyone that will
help me :)

I was able to get a good depth image using tsukuba_l and tsukuba_r using
the example "stereo_match.cpp)

Have you never tried to launch the same program giving it other
rectified images? For example, I tried to save two rectified images of
the example "stereo_calib", and using them as command line arguments
(also using the two options -i and -e for the intrinsic and extrinsic
matrixes, of course coming from the stereo_calib program now). The
output is very poor and full of noise!!!

I know that each application needs its own ad-hoc Stereo BM struct, but
the quality is too much poor to be recovered just using some special
parameter in BM State. Do you have any suggestion?

Thank you for your help
Dario

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dcazzato85 | 3 Jul 18:25 2012
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stereo_match with general rectified images, very poor result

	
Hello everybody,

this is my first post in this group. Thank you to everyone that will help me :)

I was able to get a good depth image using tsukuba_l and tsukuba_r using the example "stereo_match.cpp)

Have you never tried to launch the same program giving it other rectified images? For example, I tried to
save two rectified images of the example "stereo_calib", and using them as command line arguments (also
using the two options -i and -e for the intrinsic and extrinsic matrixes, of course coming from the
stereo_calib program now). The output is very poor and full of noise!!!

I know that each application needs its own ad-hoc Stereo BM struct, but the quality is too much poor to be
recovered just using some special parameter in BM State. Do you have any suggestion?

Thanks you for your help
Dario

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pixelindia18 | 4 Jul 04:00 2012
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How To use OpenCV normalized Correlation ?? Any sample codes ??

How To use OpenCV normalized Correlation ?? Any sample codes ??

My problem:

i have a screw head image , i need to find the center of the screw ..so i am thinking of using opencv correlation
, what do you think about this friends ????

You can find the sample image below :

http://imageshack.us/photo/my-images/685/screw1.png/

please provide me some sample codes for correlation in open cv???

How to use it ?

What is the output of the correlation function ??

Will the correlation function will provide the screw location ???

Please suggest/help me :)

Thanks in advance !!

Mahesh

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(Continue reading)

movenomolecules | 3 Jul 13:06 2012
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help wanted for unmanned field hockey recorder + tagging

Hello Group,

I'm new to the group so excuse any possible mistakes. 

I am a volunteer at our field hockey club in NL, and am looking for preferably open source video tracking
software to be able to trace the field hockey ball and thus the field hockey game at my club. 
We want to install 4 fixed camera's around the field hockey pitch (100 * 50 m) and try to stitch the video
streams together, in order to create an *unmanned video setup*. 

It seems to me that OpenCV can do all this. But I need a technical person that assist me in realising this.

What we try to do: [unmanned video capturing and tagging]. 
If we can manage this this would be of great help to the trainers, coaches and players alike. 

Hope to hear! Thank you in advance.

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MoIZ | 3 Jul 01:49 2012
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Finding Contours

I have a letter "i" in an image .. when i m applying function of cvFindContours() it is giving me output of 2
contours for "i" . how should i resolve this problem to get 1 contour for "i" or "j"

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ConshS | 2 Jul 20:58 2012
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Trouble Installing OpenCv

Hello,

I've been having a problem installing OpenCv on my system (Windows 7 SP1). I've been attempting to create
the libraries myself, but I continue to run into a problem when using CmakeGUI to finish installing the
libraries. I have Python, TBB, QT, Eigen, OpenEXR, Numpy, and NI installed in the correct manner, but
every time I attempt to configure through CmakeGUI, I always get this error:

CMake Error at cmake/OpenCVModule.cmake:187 (ocv_list_pop_front):
  Unknown CMake command "ocv_list_pop_front".
Call Stack (most recent call first):
  cmake/OpenCVModule.cmake:261 (__ocv_flatten_module_required_dependencies)
  cmake/OpenCVModule.cmake:339 (__ocv_flatten_module_dependencies)
  modules/CMakeLists.txt:5 (ocv_glob_modules)

Does anyone know a possible way to fix this problem? Or do you have a different alternative to installing the
most recent update to OpenCV to run on Visual C++ Express 2010?

Thanks.

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spspspsp1985 | 2 Jul 18:25 2012
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Orthographic projection from webcam(s)

Hi, 

I am new to opencv, so I have a question regarding reconstruction of orthographic projection images.
I have tried to illustrate the problem, but in the final version it should be using one or two webcams for
capturing the images.

Say that I have to images like these:
https://dl.dropbox.com/u/1157680/opencv/perspective1.png
https://dl.dropbox.com/u/1157680/opencv/perspective2.png
i.e. a checkerboard surface with two objects on. Since the cameras are real they captured in perspective.

I would like to construct the orthographic projection onto the surface. I.e. this is the result, I am
looking for:
https://dl.dropbox.com/u/1157680/opencv/orthographic.png

I hope that I can get some hints about how to get there?

Thanks.

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gabrieldosso | 3 Jul 11:34 2012
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[Python]problem with video retrieve

Hi everybody,
I am currently trying to implement some simple scripts in python.
A problem appear when I am using the fonction retrieve of cv2.VideoCapture. It means that I am pointing to
the good path because I am able to grab the video, but when I use retrieve(), my soft is crashing.

any Idea?
I am using OpenCV 2.4.1 on a 64 bit OS

thanks a lot

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elshayalsmartgis | 3 Jul 01:15 2012
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Free GIS Software, Free GIS Course, and Free GIS Tutorial Videos

Elshayal Smart GIS Map Editor and Surface Analysis
http://freesmartgis.blogspot.com/?spref=tw
Free GIS Software, Free GIS Course, and Free GIS Tutorial Videos

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Gmane