Arne Krüger | 11 Oct 08:31 2011
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V4L2 interface for Camera Capture

Hi folks,

in order to get our Pinacle Dazzle device working under Ubuntu Linux I
rewrote most of the Video-For-Linux interface. I removed all V4L1
specific fall-back code, which works for our purposes but will make the
code fail for all V4L1 devices. I don't regard this as a major issue
since there is a compatibility lib for V4L1.

This should solve Ticket #764.

The code might need some cleaning, especially regarding includes and
some defines (I didn't touch those).

I hope this is useful for some and would appreciate comments/feedback.

Cheers,
Arne
/* This is the contributed code:

File:             cvcap_v4l.cpp
Current Location: ../opencv-0.9.6/otherlibs/highgui

Original Version: 2003-03-12  Magnus Lundin lundin@...
Original Comments:

ML:This set of files adds support for firevre and usb cameras.
First it tries to install a firewire camera,
if that fails it tries a v4l/USB camera
(Continue reading)

Sergej Pupykin | 5 Oct 16:27 2011
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Re: class True/False in flann

At Wed, 5 Oct 2011 15:44:52 +0200,
Stefan Walk <stefan.walk@...> wrote:
> 
> The class identifiers are not the problem (they are namespaced so
> they are not in the global namespace), the defines are - just #undef
> the defines before including the opencv header.

Thanks, I solve this by #undef and #define it back then.

True and False defined in X11/Xlib.h. May be it would be better to put
some workaround into opencv?

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Sergej Pupykin | 5 Oct 15:13 2011
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class True/False in flann


Hello,

I can not build http://gmic.sourceforge.net/ with opencv because of

/usr/include/opencv2/flann/dist.h

contains

class True
{
};

class False
{
};

True and False are defines in other header. How can I solve this?

It is strange using of common words as class identifiers.

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ale-ivan | 15 Sep 11:21 2011
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Detection of heads from top-view camera


Hello,
I have a camera set up on a ceiling , capturing people standing in line. I
need to count the amount of people. Currently I do that with background
subtraction and Hough transform. The detector works well for contrast heads,
but if hear color is close to the cloth color, the performance is poor. Any
advices would be greatly appreciated. 
http://old.nabble.com/file/p32380283/1.png 1.png 
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Josh Bleecher Snyder | 2 Aug 01:21 2011
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Explanation of constants in template matching

Hi,

I'm trying to understand the template matching implementation, and I
was hoping someone might be able to give me some hints about these two
constants:

    const double blockScale = 4.5;
    const int minBlockSize = 256;

There are no comments, and looking back through the svn history at
commit messages didn't yield anything. I understand well enough (I
think) what impact they have on the subsequent code, but I don't quite
understand where these particular values come from, nor what impact
changing them might have. Any insight would be appreciated.

Thanks,
Josh

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Aric Ben Zvi | 1 Aug 18:59 2011
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bug : Find_obj.c memory storage allocation

Hello,

 

I am new at this list.

 

I run the find_obj.cpp example located at: \OpenCV2.3\opencv\samples\c\ and found a bug in the memory storage allocation.

 

The allocation at line 227, allocate the default memory size of 64Kbytes.

    CvMemStorage* storage = cvCreateMemStorage(0);

 

Howver the size of the seqances (objectKeypoints, objectDescriptors, imageKeypoints, imageDescriptors) recived form the cvExtractSURF function is much larger.

(593*24+593*512+299*24+299*512+Sturctures+headers >  466Kbyte).

 

Therefore I suggest ot change the memory allocation in line 277 to:

    CvMemStorage* storage = cvCreateMemStorage(0x100000); //1MByte

 

 

Please update the example file.

Best Regards

 

Aric

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Gary Bradski | 27 Jul 01:07 2011
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I have temporarily suspended accounts on the OpenCV Wiki

I just cleaned up a ton of spam and so have temporarily suspended new accounts on the OpenCV wiki until we can put in an account approval system.

I've also been deleting spam accounts (you go to settings, switch user.  Then change their password.  Then go to preferences. Change their email, add some "ddd" in front of their user name to indicate its' been deleted and mark the check box to disable the account forever).

Who is yvopub ?  I accidently changed that password. It's now OpenCV

Gary

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Nghia Ho | 17 Jul 02:23 2011
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Build problems with 2.3.0 on Windows

When trying to build on Windows using MSVC2005 and MSVC200 (either 32 or 64bit) I get this:

i>------ Skipped Build: Project: uninstall, Configuration: Release Win32
------
1>Project not selected to build for this solution configuration
2>------ Skipped Build: Project: INSTALL, Configuration: Release Win32
------
2>Project not selected to build for this solution configuration
3>------ Skipped Build: Project: PACKAGE, Configuration: Release Win32
------
3>Project not selected to build for this solution configuration
========== Build: 0 succeeded, 0 failed, 122 up-to-date, 3 skipped

On closer inspection all the lib/dll are built correctly. The problem is the INSTALL project looks for opencv_ffmpeg230d.dll (and possibly opencv_ffmpeg230d.lib), which are not suppose to exist? As a result, the build script does not finish and does not create the 'include' directory correctly, missing all the opencv/opencv2 headers. I got it working by downloading the Windows Superpack and manually copying the header files over.

There is another user on the OpenCV yahoo user group that reports this problem.

Nghia
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Nghia Ho | 12 Jul 03:01 2011
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Future of C version?

Hi all,

More of a curious question. What will eventually happen to the C version of OpenCV in future releases. Is it just going to be the back end for the C++ wrapper for low level stuff like matrices? Seems like all the new features are C++, with many of them having no equivalent C calls.

Nghia
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Jose Luis Blanco | 11 Jul 10:14 2011
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On Debian/Ubuntu packaging for OpenCV 2.2 / 2.3+

Hi all,

I came across this [1] personal Ubuntu repository by Gijs Molenaar who
packaged OpenCV 2.2 for Ubuntu. I see there that the big
restructuration into modules obviously put an end to the different
lib*-dev packages, and at least in this package all of them are
replaced by only one "libopencv-dev" (just like in pre 1.0 ancient
times).

And I wondered if anyone involved in the "oficial packaging" for
Debian and/or Ubuntu knows if this is also the convention to be
followed in the future... btw, my interest in this comes from the need
to know what to write in the "Build-depends:" line in other dependant
packages ;-)

Cheers,
Jose Luis

[1] https://launchpad.net/~gijzelaar/+archive/opencv2

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Vadim Pisarevsky | 4 Jul 19:27 2011
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OpenCV 2.3.0 final is out

Hello everybody,

OpenCV 2.3.0 has been just released.

Thanks a lot to everybody who participated, reported bugs, tested 2.3rc packages etc!

Here are the major changes since 2.3rc:

1. Documentation has been further improved. There is now again a single reference manual that describes C++, C and Python interfaces (with Java interface likely to come in 2.3.1).

2. Fixed a few build problems, including the case of Visual Studio 2005.

3. [Windows] opencv_ffmpeg.dll does not have to be built anymore for every compiler, every configuration etc. It is now available for all users.

4. [Windows] We prepared "superpack" package (OpenCV-2.3.0-win-superpack.exe) containing pre-built OpenCV libs for different compilers, following the poll at http://tech.groups.yahoo.com/group/OpenCV/surveys?id=3051965. To bring the size down, we did not include static ffmpeg libs or Visual Studio 2005 libs. Python 3.0 is also not supported yet. But there is higher chance that you will find binaries that suit you in the superpack.
   The superpack is not an installation package, it is self-extracting archive. An installer is probably to come in 2.3.1 or 2.4.

The OpenCV post-ice-age history of changes can be found here: http://opencv.willowgarage.com/wiki/OpenCV%20Change%20Logs

You are welcome to try it out and report any problems (by e-mail or via our bug tracker https://code.ros.org/trac/opencv).

You can take the packages at SourceForge:
   b) https://sourceforge.net/projects/opencvlibrary/files/opencv-win/2.3/ (the source zip and the sfx superpack).
       GPU-accelerated binaries are to be added a few days later. VS2008 users can take opencv_gpu230 from 2.3rc package - it has not been changed since then.

Regards,
Vadim

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