OpenCV : Messages : 68484-68513 of 68513

which is the best algorithm to estimate and visualise 2D skeleton from a tracked
countur using Opencv

how a bout Recursive Centroid algorithm? please can any one provide documents
regarding this

#68504

From: "luca.dantona" <luca.dantona@...>
Date: Sun Dec 27, 2009 3:23 pm
Subject: Radiometric Similarity

luca.dantona

Offline

Hi all!
Is anyone aware of any c/c++ implementation of the radiometric similarity
between two images?

Thanks!

#68503

From: "gareth.edwards31" <gareth.edwards@...>
Date: Sun Dec 27, 2009 12:24 pm
Subject: MatND to CvMat (Python), OpenCV 2.0 ?

gareth.edwar...

Offline

Hi,

Sorry if this is a dumb question, but if I use cv.CreateHist to create a  2D
histogram (which happens to return a MatND), how can I efficiently (this is in
Python BTW) convert/access the MatND as if it were a normal 2D CvMat?  (to do
things like smooth it, etc)

Thanks in advance,

Gareth

#68502

From: Robin Hewitt <get_imaginary@...>
Date: Sun Dec 27, 2009 2:18 am
Subject: Re: Tracking data

get_imaginary

Offline

I'd suggest you email the authors. If for some reason they don't send you a
link, you can write a simple app to replace each pure red (or whatever color the
markings are) pixel with an interpolated value from its 4 or 8 neighbors.

- Robin




________________________________
From: rami.bena <rami.bena@...>
To: OpenCV@yahoogroups.com
Sent: Sat, December 26, 2009 3:33:21 PM
Subject: [OpenCV] Tracking data


Hi,
I have recently implemented a tracking algorithm with Opencv. I am actually
looking for data to evaluate my approach. I have seen a very relevant data
published by CMU researchers in PETS 2005. There is a set of their data at
http://www.consorti um.ri.cmu. edu/projTracking .php, but unfortunately marked.
Does anybody know how can I get to the raw (unmarked) data?
Any hint will be appreciated.

Rami







[Non-text portions of this message have been removed]

#68501

From: "jesse_ross_jones" <rhavenj@...>
Date: Sun Dec 27, 2009 2:06 am
Subject: getPerspectiveTransform finding inverse warp matrix

jesse_ross_j...

Offline

Hi,
Im working on a part of a program to identify corners of a table top, and warp
these points into the correct perspective. I have managed to do this and from
here Id like to do two things: the first is to get an inverse perspective warp
matrix and the second is to transform single points using the warp matrix from
getPerspectiveTransform as well as transform points using the inverse warp
matrix.

To find the inverse do I use cvInvert to find the inverse or is there a way to
use getPerspectiveTransform directly?
For the second task of transforming single points im not sure what to use. Any
help is greatly appreciated!

I realize this question is likely answered already, but I did a bit of searching
and didnt find, but I apologize if I missed a post regarding this already.

thank you and Happy New Year

#68500

From: "rami.bena" <rami.bena@...>
Date: Sat Dec 26, 2009 11:33 pm
Subject: Tracking data

rami.bena

Offline

Hi,
I have recently implemented a tracking algorithm with Opencv. I am actually
looking for data to evaluate my approach. I have seen a very relevant data
published by CMU researchers in PETS 2005. There is a set of their data at
http://www.consortium.ri.cmu.edu/projTracking.php, but unfortunately marked.
Does anybody know how can I get to the raw (unmarked) data?
Any hint will be appreciated.

Rami

#68499

From: "SimonH" <s.harto70@...>
Date: Sun Dec 27, 2009 12:40 am
Subject: Toshiba Satellite L505-S5993 TruBrite

s.harto70

Offline

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or
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Regards
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#68498

From: "stippling_org" <Adrian_Secord@...>
Date: Sat Dec 26, 2009 10:07 pm
Subject: Patch: solve() in cxcore/cxlapack.cpp does double the work for small matrices

stippling_org

Offline

Hi:

cvSolve() calls solve() in cxcore/cxlapack.cpp, which has special cases for
small (2x2 and 3x3) systems of equations.  For these special cases it uses
hand-written solutions instead of calling the heavy-weight Lapack machinery,
which is great.

Unfortunately a typo in the code prevents solve() from returning after the
special cases.  Instead, execution continues on to the Lapack machinery, which
solves the systems all over again.  This is, of course, slow.

I have included the trivial patch to fix this bug in this post -- could someone
apply it to the current SVN?  I can't for the life of me figure out how to get
to the OpenCV bug repository on the ROS pages.

I have tested this in my applications, but not with the OpenCV test suite.

If you're curious, it seems that the bug was introduced in Jan 2009 with
revision 1550 where a macro called EXIT was removed, hence removing the early
return.

Thanks,

Adrian Secord.

*** old/cxlapack.cpp 2009-12-26 16:31:24.000000000 -0500
--- new/cxlapack.cpp 2009-12-26 16:31:48.000000000 -0500
***************
*** 531,536 ****
--- 531,538 ----
                       result = false;
               }
           }
+
+         return result;
       }

       {

#68497

From: "francesco\.bruno\@libero\.it" <francesco.bruno@...>
Date: Sat Dec 26, 2009 5:39 pm
Subject: Re: Segmentation Faults with cvCvtColor and cvResize

santinopp

Offline

Hi,
could you please try to use
CV_BGR2GRAY
instead of
CV_RGB2GRAY
in cvCvtColor();

please let me know.

Regards


---------- Initial Header -----------

From      : OpenCV@yahoogroups.com
To          : OpenCV@yahoogroups.com
Cc          :
Date      : Sat, 26 Dec 2009 15:11:55 -0000
Subject : [OpenCV] Segmentation Faults with cvCvtColor and cvResize







> I'm trying the face detection example in Qt+OpenCV but i get
> segmentation faults:
>
> The code:
> [...]
> IplImage *grayImage = cvCreateImage(cvSize(cvImage->width,
> cvImage->height), 8, 1);
> IplImage *smallImage =
> cvCreateImage(cvSize(cvRound(cvImage->width/scale),
> cvRound(cvImage->height/scale)), cvImage->depth, 1);
>
> //cvCvtColor(cvImage, grayImage, CV_RGB2GRAY);      // Segmentation
> Fault
> cvConvertImage(cvImage, grayImage, 0);                             // if
> I change cvCvtColor to cvConvertImage  there is no error
>
> //cvResize(grayImage, smallImage, CV_INTER_LINEAR);    //  (Segmentation
> Fault)
> cvCopy(grayImage, smallImage, 0);
> // It works (with scale = 1 of course);
>
> cvEqualizeHist(smallImage, smallImage);
> [...]
>
>
> - cvImage is an IplImage with its buffer shared with a QImage like this:
>
> IplImage* frame = cvQueryFrame(mCamera);
> QImage qtImage = QImage(QSize(frame->width,  frame->height),
> QImage::Format_RGB888);
> cvImage = cvCreateImageHeader(cvSize(frame->width, frame->height),  8,
> 3);
> cvImage->imageData = (char *)qtImage.bits();
>
>
>
> - Why I get those segmentation faults?
>
>
>
>
>
>
>

Reply | Forward | Messages in this Topic (3)

#68496

From: Samuel Audet <samuel.audet@...>
Date: Sat Dec 26, 2009 5:25 pm
Subject: Re: Segmentation Faults with cvCvtColor and cvResize

guardia36

Offline

On 2009-12-27 00:11, kronen777 wrote:
> I'm trying the face detection example in Qt+OpenCV but i get
> segmentation faults:

That's probably because you are not using the same compiler for Qt and
OpenCV. Use the same compiler to compile both. Failing that, disabling
SSE in OpenCV should work

Samuel

Reply | Forward | Messages in this Topic (3)

#68495

From: "kronen777" <kronenr@...>
Date: Sat Dec 26, 2009 3:11 pm
Subject: Segmentation Faults with cvCvtColor and cvResize

kronen777

Offline

I'm trying the face detection example in Qt+OpenCV but i get
segmentation faults:

The code:
[...]
IplImage *grayImage = cvCreateImage(cvSize(cvImage->width,
cvImage->height), 8, 1);
IplImage *smallImage =
cvCreateImage(cvSize(cvRound(cvImage->width/scale),
cvRound(cvImage->height/scale)), cvImage->depth, 1);

//cvCvtColor(cvImage, grayImage, CV_RGB2GRAY);      // Segmentation
Fault
cvConvertImage(cvImage, grayImage, 0);                             // if
I change cvCvtColor to cvConvertImage  there is no error

//cvResize(grayImage, smallImage, CV_INTER_LINEAR);    //  (Segmentation
Fault)
cvCopy(grayImage, smallImage, 0);
// It works (with scale = 1 of course);

cvEqualizeHist(smallImage, smallImage);
[...]


- cvImage is an IplImage with its buffer shared with a QImage like this:

IplImage* frame = cvQueryFrame(mCamera);
QImage qtImage = QImage(QSize(frame->width,  frame->height),
QImage::Format_RGB888);
cvImage = cvCreateImageHeader(cvSize(frame->width, frame->height),  8,
3);
cvImage->imageData = (char *)qtImage.bits();



- Why I get those segmentation faults?

Reply | Forward | Messages in this Topic (3)

#68494

From: "jonckb0" <jonckb0@...>
Date: Sat Dec 26, 2009 10:05 am
Subject: Need help to capture images with IP cameras using OpenCV and Visual Studio 2008

jonckb0

Offline

Hi. I'm working on a school project which requires me to use network cameras
with OpenCV and Microsoft Visual Studio 2008. I'm new to OpenCv and VS2008.
Currently I'm familiarising myself with VS2008 and so far I'm able to load an
image from my hard disk and display it on screen.

I would like to know how to capture images from network cameras and display them
on screen. I have 2 cameras and both of them are connected to a router which is
connected to the internet. They have static IP addresses of
"http://192.168.2.30" and "http://192.168.2.31" respectively. Both of their
usernames are "admin" and passwords are blank.

Any help is appreciated. Sample codes would be good too. Thanks :)

#68493

From: "Samy Sadek" <samy.sakr@...>
Date: Sat Dec 26, 2009 8:07 am
Subject: help in cvblobslib_OpenCV_v8_3

samy.sakr

Offline

hi there,
I have tried more than once to build cvblobslib_OpenCV_v8_3 without no
success....
PS: I am using windows vista + Visual Studio 2008.
Any help or some instructions are highly appreciated.
Merry Christmas,
SAMY

#68492

From: Golan Levin <golan@...>
Date: Sat Dec 26, 2009 7:55 am
Subject: Re: Help regarding cvBlobLib

golanlevin

Offline

Razerjack,

Your problem is that you do not understand C/C++ pointers.

Go read Chapter 5 of Kernighan & Ritchie:
http://www.google.com/#q=kernighan+and+ritchie+pdf

Alternatively, the following web site is very helpful:
http://lmgtfy.com/?q=C%2B%2B+pointers

Best,
Golan



On Sat, Dec 26, 2009 at 2:32 AM, 702 <razerjack89@...> wrote:

>
>
>
> hi ,
>
> currentBlob =blobs.GetBlob(i);
>
> error C2440: '=' : cannot convert from 'CBlob' to 'CBlob *'
>
> I am having this error . i tried to do different things to remove this but
> :(
>
> then I tried currentBlob=(CBlob*)blobs.GetBlob(i);
>
> error C2440: 'type cast' : cannot convert from 'CBlob' to 'CBlob *'
>
> Thanx in advance
>
>
>


[Non-text portions of this message have been removed]

#68491

From: "702" <razerjack89@...>
Date: Sat Dec 26, 2009 7:32 am
Subject: Help regarding cvBlobLib

razerjack89

Offline

hi ,


currentBlob =blobs.GetBlob(i);

error C2440: '=' : cannot convert from 'CBlob' to 'CBlob *'

I am having this error . i tried to do different things to remove this but :(


then I tried currentBlob=(CBlob*)blobs.GetBlob(i);

error C2440: 'type cast' : cannot convert from 'CBlob' to 'CBlob *'

Thanx in advance

#68490

From: Snit Roy <coolsayan@...>
Date: Sat Dec 26, 2009 5:12 am
Subject: cvblobslib_v6p1.tar.gz

coolsayan...

Offline

cvblobslib_v6p1.tar.gz

how to incorporate it in linux?





[Non-text portions of this message have been removed]

#68489

From: "M" <eng_mhd_w@...>
Date: Fri Dec 25, 2009 10:42 pm
Subject: Using cvblobslib in C++Builder

eng_mhd_w

Offline

Hello everyone,

I have a problem in using the library "cvblobslib" in CodeGear C++Builder2009

As usual, I used Coff2Omf to get compatible LIB file to CodeGear C++Builder.
Then I included all the necessary paths and directories to my project. And I
also added the cvbloblibs.lib to the project.

After doing the previous settings, I get the following linker error:

[ILINK32 Error] Error: Unresolved external 'CBlobResult::~CBlobResult()'
referenced from C:\DOCUMENTS AND SETTINGS\PROJECTS\BLOBS\DEBUG\UNIT1.OBJ

[ILINK32 Error] Error: Unresolved external 'CBlobResult::CBlobResult()'
referenced from C:\DOCUMENTS AND SETTINGS\PROJECTS\BLOBS\DEBUG\UNIT1.OBJ

Could you please help me! You can download the library and do test to see the
problem.

The download link:
http://opencv.willowgarage.com/wiki/cvBlobsLib?action=AttachFile&do=view&target=\
cvblobslib_OpenCV_v8_3.zip

I am looking forward to hearing your help.

Merry Christmas!

Regards,

#68488

From: Snit Roy <coolsayan@...>
Date: Fri Dec 25, 2009 9:35 am
Subject: /usr/bin/ld: cannot find -lopencv collect2: ld returned 1 exit status

coolsayan...

Offline

when i am tryng to compile my code with

gcc -I/usr/lib/opencv2.0/include/opencv -L/usr/lib/opencv2.0/lib -lopencv
-lhighgui -lstdc++ $1 -o $2
../$2 &


i am getting :

/usr/bin/ld: cannot find -lopencv collect2: ld returned 1 exit status

but without -lopencv its run fine.
whats wrong with -lopencv option??

regards




[Non-text portions of this message have been removed]

#68487

From: Snit Roy <coolsayan@...>
Date: Fri Dec 25, 2009 7:19 am
Subject: ./configure with xine

coolsayan...

Offline

hi

which file to add to pkg_config_path to enable xine in ./configure??
xine is installed but pkg-config --libs xine is failing to find out xine.pc.



regards





[Non-text portions of this message have been removed]

#68486

From: Snit Roy <coolsayan@...>
Date: Fri Dec 25, 2009 5:14 am
Subject: ./configure+--without-quicktime+--with-xine+-with-ffmpeg

coolsayan...

Offline

hi


But i found

[root@rac-1 OpenCV-2.0.0]# pkg-config --libs ffmpeg
Package ffmpeg was not found in the pkg-config search path.
Perhaps you should add the directory containing `ffmpeg.pc'
to the PKG_CONFIG_PATH environment variable
No package 'ffmpeg' found
[root@rac-1 OpenCV-2.0.0]#

how to add ffmpeg to package config path?




[Non-text portions of this message have been removed]

Reply | Forward | Messages in this Topic (5)

#68485

From: Snit Roy <coolsayan@...>
Date: Fri Dec 25, 2009 5:01 am
Subject: ./configure+--without-quicktime+--with-xine+-with-ffmpeg

coolsayan...

Offline

../configure --prefix=/home/bee33/lib/opencv --enable-apps
--enable-shared --with-ffmpeg --with-gnu-ld -without-quicktime
CFLAGS=-I/usr/local/include CPPFLAGS=-I/usr/local/include
LDFLAGS=-L/usr/local/lib

even this one is not working.





[Non-text portions of this message have been removed]

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#68484

From: Snit Roy <coolsayan@...>
Date: Fri Dec 25, 2009 4:46 am
Subject: ./configure+--without-quicktime+--with-xine+-with-ffmpeg

coolsayan...

Offline