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-<title>OpenCV Documentation (draft)</title>
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-Frequently Asked Questions / Troubleshootings / HOWTOs
-</font></font></i></center>
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-
-<h1>General Questions</h1>
-
-<hr><h3>How to install OpenCV properly?</h3>
-<p>Read <a href="../INSTALL">installation guide</a>
-
-<hr><h3>How can I get acquainted with OpenCV fast?</h3>
-<p>
-<ol><li>Look at <a href="../samples/c/">samples</a>.
-<li>Within Visual Studio you may load <a href="../_make/">OpenCV workspace</a>:
-<ul>
-<li>opencv.dsw for Microsoft Visual Studio 6.0
-<li>opencv.sln for Microsoft Visual Studio .NET 2003
-<li>cbuilderx/opencv.bpgr for Borland C++ BuilderX
-</ul>
-select <code>cvsample</code> project, build it and run. Look into the code
-and modify it as you wish.
-<li>Also, scan through <a href="index.htm#ref">reference manuals</a> - they contain some example code as well.
-<li>Search OpenCV archives at <a href="http://groups.yahoo.com/group/OpenCV">http://groups.yahoo.com/group/OpenCV</a>
-for the topic you are interesting in.
-<li>Create a new project <a href="#devstudio_project">from scratch</a>
-or modify existing <code>cvsample</code>.
-There are application wizards for Microsoft Visual Studio that create OpenCV-aware projects;
-look for them at <a href="http://groups.yahoo.com/group/OpenCV">http://groups.yahoo.com/group/OpenCV</a>
-(Files section - you have to be registered OpenCV@yahoogroups.com user)
-</ol>
-</p>
-
-<hr><h3>Where do I submit Bug reports for the computer vision library?</h3>
-<p>Send email to <a href="mailto:OpenCV@yahoogroups.com">OpenCV@yahoogroups.com</a>
-Subject: BUG <....your title...></p>
-
-<hr><h3>How do I send bug reports on the Intel® Integrated Performance Primitives</h3>
-<p>Send email to <a href="mailto:developer_support@intel.com">developer_support@intel.com</a></p>
-
-<hr><h3>How do I join the OpenCV forum?</h3>
-<p>Send email to <a href="mailto:OpenCV-subscribe@yahoogroups.com">OpenCV-subscribe@yahoogroups.com</a>,
-after you are a member and select your login, you can read the web group at
-<a href="http://groups.yahoo.com/group/OpenCV">http://groups.yahoo.com/group/OpenCV</a></p>
-
-<hr><h3>How do I modify the web group so that I don't receive tons of email's?</h3>
-<p>To get the messages real time, or once a day as a daily digest,
-you can go to <a href="http://groups.yahoo.com/mygroups" target="_top">http://groups.yahoo.com/mygroups</a>
-and choose your setting from the pull down list to the right of OpenCV.;</p>
-
-<hr><h3>Ok, I found the group completely useless for me. How can I unsubscribe?</h3>
-<p>Mail to <a href="mailto:OpenCV-unsubscribe@yahoogroups.com">OpenCV-unsubscribe@yahoogroups.com</a>
-with subject <b>[OpenCV]</b> and arbitrary message contents.</p>
-
-<hr><h3>When using OpenCV and IPL simultaneously, I get compiler errors. How to resolve this problem?</h3>
-<p>To be completely independent from IPL, OpenCV duplicates declarations of IplImage
-and few other structures and constants if it is not told explicitly that IPL is present.
-Defining HAVE_IPL before including OpenCV headers or putting "#include <ipl.h>"
-before OpenCV headers resolves the conflict.</p>
-
-<hr><h3>Does OpenCV work on other processors?</h3>
-<p>Yes, OpenCV itself is open source and it is quite portable, especially across
-32-bit platforms. On the other hand, OpenCV can run much faster on Intel processors
-because of <a href="index.htm#ipp">IPP</a>.
-
-
-<hr><h1>Windows® OS related Qs:</h1>
-
-<hr><h3>When I try to build one of the
-apps, I get an error, streams.h not found.</h3>
-<p>You need install and setup DirectShow SDK that is now a part of Platform SDK
-(Windows Server 2003 SP1 SDK or later).
-Here is the procedure:
-<ol>
-<li>Download the Platform SDK from
- <a href="http://www.microsoft.com/msdownload/platformsdk/sdkupdate/">
- http://www.microsoft.com/msdownload/platformsdk/sdkupdate/</a><br>
- and DirectX SDK from <a href="http://msdn.microsoft.com/directx/">
- http://msdn.microsoft.com/directx/</a>
- (They are huge, but you can download and install them by parts).<br>
- If it doesn't work for you, consider HighGUI that can capture video via VFW or MIL
-
-<li>Install Platform SDK <em>together</em> with DirectShow SDK.<br>
- Install DirectX SDK (with or without sample code).
-
-<li>Build baseclasses.
- See <PlatformSDKInstallFolder>\samples\multimedia\directshow\readme.txt.
-
-<li>Copy the built libraries (called strmbase.lib and strmbasd.lib
- in Release and Debug versions, respectively) to
- <PlatformSDKInstallFolder>\lib.
-
-<li>In Developer Studio add the following paths:<br>
- <DirectXSDKInstallFolder>\include<br>
- <PlatformSDKInstallFolder>\include<br>
- <PlatformSDKInstallFolder>\samples\multimedia\directshow\baseclasses<br>
- to the includes' search path
- (at Tools->Options->Directories->Include files in case of Visual Studio 6.0,<br>
- at Tools->Options->Projects and Solutions->VC++ Directories->Include files in case
- of Visual Studio 2005)<br>
- Add<br>
- <DirectXSDKInstallFolder>\lib<br>
- <PlatformSDKInstallFolder>\lib<br>
- to the libraries' search path (in the same dialog, ...->"Library files" page)<p>
-
- NOTE: PUT THE ADDED LINES ON THE VERY TOP OF THE LISTS, OTHERWISE YOU MAY STILL GET
- COMPILER OR LINKER ERRORS. This is necessary, because Visual Studio
- may include older versions of the same headers and libraries.</p>
-
-<li>Now you can build OpenCV DirectShow filters.
-</ol>
-
-<hr><h3>After installing DirectX SDK I'm still getting linker error about undefined
- or redefined "TransInPlace" filter class constructors etc.</h3>
-<p>Put the paths to the SDKs' include and lib folders on the top of the search lists.</p>
-
-<hr><h3>When I use try to use cvcam, it just crashes</h3>
-<p>Make sure, you registered ProxyTrans.ax and SyncFilter.ax</p>
-
-<!-- <hr><h3>CamShiftDemo can not be run</h3>
-<p>Make sure, you registered CamShift.ax and you have DirectShow-compatible camera</p> -->
-
-<hr><h3>How to register *.ax (DirectShow filter)?</h3>
-<p>Open the file (within explorer) using regsvr32.exe (under Win2000 it is done by
-Open with->Choose Program...->Browse...->c:\windows\system32\regsvr32.exe (path may be different).
-You may remember association to save clicks later.</p>
-
-<hr><h3>Filter couldn't be registered (regsvr32 reports an error)</h3>
-<p>The most probable reason is that the filter requires some DLLs that are not in the path.
-In case of OpenCV make sure <OpenInstallFolder>\bin is in the path</p>
-
-<!-- <hr><h3>LKDemo / HMMDemo reports an error during startup and no the view is completely black</h3>
-<p>To run either of these apps you will need VFW-compatible camera.
-At startup the programs iterate through registered video capture devices.
-It might be that they could not find one. Try to select the camera manually
-by pressing "tune capture parameters" (camera) toolbar button. Then, try to
-setup video format (the button on the left from camera) to make the camera work.
-</p> -->
-
-
-<hr><h3>cxcore096d.dll or cxcored.lib seem to be missing</h3>
-<p>cxcore096d.dll means debug version of cxcore DLL and cxcored.lib is the import library for cxcore096d.dll.
-Open <a href="../_make/">OpenCV workspace</a>, select "cxcore" as active project and
-select "Win32 Debug" configuration. Build the library and you will get bin\cxcore096d.dll and
-lib\cxcored.lib files. The same should be repeat for <em>all</em> the other OpenCV components
-- name of binary, ending with <em>d</em> means Debug version that are not shipped.</p>
-
-<hr><h3>When compiling HighGUI I get the error message "mil.h is not found"</h3>
-mil.h is a part of Matrox Imaging Library (MIL) that is usually supplied with
-Matrox (or compatible) framegrabbers, such as Meteor, Meteor II etc.
-<ul>
-<li>If you have such
-a framegrabber and MIL installed, add mil\include and mil\lib to the search paths
-within Developer Studio (submenu Tools->Options->Directories).
-<li>If you do not have MIL, just ignore the error. The file mil.h is only required
-to build MIL-aware version of Highgui "Win32 MIL Debug" or "Win32 MIL Release".
-Select "Win32 Debug" or "Win32 Release" configuration of highgui
-(submenu Build->Set Active Configuration...) instead - these versions of highgui
-can still be used to grab video via VFW interface, work with AVIs and still images.
-</ul>
-
-<hr><h3>How can I debug DirectShow filter?</h3>
-<p><ul>
-<li>Open workspace with the filter (e.g. opencv.dsw),
-<li>select the filter as active project and build it in debug configuration,
-<li>switch to explorer for a minute to register debug version of the filter
-(e.g. regsvr32 camshiftd.ax) (it needs to be done only when debug/release version are switched - not
-every time when filter is recompiled, because registry stores only the filter name),
-<li>get back to Developer Studio and start debugging session (F5).
- It will ask, what application do you want to run to debug the module.
- You may choose camshiftdemo to debug camshift.ax and
- DirectX SDK tool graphedit to debug arbitrary DirectShow filter.
-<li>Within graphedit build filter graph (e.g. camera->camshift->renderer)
-<li>Save the graph (you may just load it next time)
-<li>Set the breakpoint inside ::Transform method of the filter or in other location.
-<li>Run the filter and ... have fun
-</ul>
-
-
-<hr><h3><a name="devstudio_project">How can I create Developer Studio project to start playing with OpenCV</a></h3>
-<p>(note: this is a lengthy answer)
-<p>
-To create your own OpenCV-based project in Developer Studio
-from scratch do the following:</p>
- <ol>
- <li>Within Developer Studio create new application:
- <ol>
- <li>select from menu "File"->"New..."->"Projects" tab.
- Choose "Win32 Application" or "Win32 console application" - the latter is
- the easier variant and the both sample projects have this type.
-
- <li>type the project name and choose location
- <li>you may create own workspace for the project ("Create new workspace")
- or include the new project into the currently loaded workspace
- ("Add to current workspace").
- <li>click "next" button
- <li>choose "An empty project", click "Finish", "OK".
- </ol>
- After the above steps done Developer Studio will create the project
- folder (by default it has the same name as the project),
- <project name>.dsp file and, optionally, <project name>.dsw,.ncb ... files
- if you create own workspace.
-
- <li>Add a file to the project:
- <ul>
- <li>select from menu "File"->"New..."->"Files" tab.
- <li>choose "C++ Source File", type file name and press "OK"
- <li>add OpenCV-related #include directives:
- <pre>
- #include "cv.h"
- /* #inlcude "cvaux.h" // experimental stuff (if need) */
- #include "highgui.h"
- </pre>
- Or, you may copy some existing file (say, opencv\samples\c\morphology.c) to the project folder,
- open it and add to the project
- (right click in editor view -> "Insert File into Project" -> <your project name> ).
- </ul>
- <li>Customize project settings:
- <ul>
- <li>Activate project setting dialog by choosing menu item
- "Project"->"Settings...".
- <li>Select your project in the right pane.
- <li>Tune settings, common to both Release and Debug configurations:
- <ul>
- <li>Select "Settings For:"->"All Configurations"
- <li>Choose "C/C++" tab -> "Preprocessor" category -> "Additional Include Directories:".
- Add comma-separated relative (to the .dsp file) or absolute paths
- to opencv\cxcore\include, opencv\cv\include, opencv\otherlibs\highgui and, optionally,
- opencv\cvaux\include.
- <li>Choose "Link" tab -> "Input" category -> "Additional library path:".
- Add the paths to all necessary import libraries (cxcore[d].lib cv[d].lib hihghui[d].lib cvaux[d].lib)
- </ul>
- <li>Tune settings for "Debug" configuration
- <ul>
- <li>Select "Settings For:"->"Win32 Debug".
- <li>Choose "Link" tab -> "General" category -> "Object/library modules".
- Add space-separated cvd.lib, highguid.lib, cvauxd.lib (optionally)
- <li>You may also want to change location and name of output file. For example,
- if you want the output .exe file to be put into the project folder, rather
- than Debug/ subfolder, you may type ./<exe-name>d.exe in
- "Link" tab -> "General" category -> "Output file name:".
- </ul>
- <li>Tune settings for "Release" configuration
- <ul>
- <li>Select "Settings For:"->"Win32 Release".
- <li>Choose "Link" tab -> "General" category -> "Object/library modules".
- Add space-separated cv.lib, highgui.lib, cvaux.lib (optionally)
- <li>Optionally, you may change name of the .exe file:
- type ./<exe-name>.exe in "Link" tab -> "General" category -> "Output file name:".
- </ul>
- </ul>
- <li>Add dependency projects into workspace:
- <ul>
- <li>Choose from menu: "Project" -> "Insert project into workspace".
- <li>Select opencv\cv\make\cv.dsp.
- <li>Do the same for opencv\cvaux\make\cvaux.dsp, opencv\otherlibs\highgui\highgui.dsp.
- <li>Set dependencies:
- <ul>
- <li>Choose from menu: "Project" -> "Dependencies..."
- <li>For "cv" choose "cxcore",
- <li>For "cvaux" choose "cv", "cxcore",
- <li>for "highgui" choose "cxcore",
- <li>for your project choose all: "cxcore", "cv", "cvaux", "highgui".
- </ul>
- The dependencies customization allows to automatically build debug versions
- of opencv libraries and rebuild the binaries if the sources are changed somehow.
- </ul>
- <li>That's it. Now compile and run everything.
- </ol>
-
-<hr><h1>Linux Related Qs:</h1>
-
-TODO
-
-
-<hr><h1>Technical Questions on Library use:</h1>
-
-<hr><h3>How to access image pixels</h3>
-<p>
-(The coordinates are 0-based and counted from image origin, either top-left
-(img->origin=IPL_ORIGIN_TL) or bottom-left (img->origin=IPL_ORIGIN_BL)
-<ul>
-<li>Suppose, we have 8-bit 1-channel image I (IplImage* img):
-<pre>
-I(x,y) ~ ((uchar*)(img->imageData + img->widthStep*y))[x]
-</pre>
-<li>Suppose, we have 8-bit 3-channel image I (IplImage* img):
-<pre>
-I(x,y)<sub>blue</sub> ~ ((uchar*)(img->imageData + img->widthStep*y))[x*3]
-I(x,y)<sub>green</sub> ~ ((uchar*)(img->imageData + img->widthStep*y))[x*3+1]
-I(x,y)<sub>red</sub> ~ ((uchar*)(img->imageData + img->widthStep*y))[x*3+2]
-</pre>
-e.g. increasing brightness of point (100,100) by 30 can be done this way:
-<pre>
-CvPoint pt = {100,100};
-((uchar*)(img->imageData + img->widthStep*pt.y))[pt.x*3] += 30;
-((uchar*)(img->imageData + img->widthStep*pt.y))[pt.x*3+1] += 30;
-((uchar*)(img->imageData + img->widthStep*pt.y))[pt.x*3+2] += 30;
-</pre>
-or more efficiently
-<pre>
-CvPoint pt = {100,100};
-uchar* temp_ptr = &((uchar*)(img->imageData + img->widthStep*pt.y))[x*3];
-temp_ptr[0] += 30;
-temp_ptr[1] += 30;
-temp_ptr[2] += 30;
-</pre>
-<li>Suppose, we have 32-bit floating point, 1-channel image I (IplImage* img):
-<pre>
-I(x,y) ~ ((float*)(img->imageData + img->widthStep*y))[x]
-</pre>
-<li>Now, the general case: suppose, we have N-channel image of type T:
-<pre>
-I(x,y)<sub>c</sub> ~ ((T*)(img->imageData + img->widthStep*y))[x*N + c]
-or you may use macro CV_IMAGE_ELEM( image_header, elemtype, y, x_Nc )
-I(x,y)<sub>c</sub> ~ CV_IMAGE_ELEM( img, T, y, x*N + c )
-</pre>
-</ul>
-There are functions that work with arbitrary (up to 4-channel) images and matrices
-(cvGet2D, cvSet2D), but they are pretty slow.
-</p>
-
-<hr><h3>How to access matrix elements?</h3>
-<p>The technique is very similar.
-(In the samples below i - 0-based row index, j - 0-based column index)
-<ul>
-<li>Suppose, we have 32-bit floating point real matrix M (CvMat* mat):
-<pre>
-M(i,j) ~ ((float*)(mat->data.ptr + mat->step*i))[j]
-</pre>
-<li>Suppose, we have 64-bit floating point complex matrix M (CvMat* mat):
-<pre>
-Re M(i,j) ~ ((double*)(mat->data.ptr + mat->step*i))[j*2]
-Im M(i,j) ~ ((double*)(mat->data.ptr + mat->step*i))[j*2+1]
-</pre>
-<li>For single-channel matrices there is a macro CV_MAT_ELEM( matrix, elemtype, row, col ),
-i.e. for 32-bit floating point real matrix<pre>
-M(i,j) ~ CV_MAT_ELEM( mat, float, i, j ),</pre> e.g. here is
-initialization of 3x3 identity matrix:<pre>
-CV_MAT_ELEM( mat, float, 0, 0 ) = 1.f;
-CV_MAT_ELEM( mat, float, 0, 1 ) = 0.f;
-CV_MAT_ELEM( mat, float, 0, 2 ) = 0.f;
-CV_MAT_ELEM( mat, float, 1, 0 ) = 0.f;
-CV_MAT_ELEM( mat, float, 1, 1 ) = 1.f;
-CV_MAT_ELEM( mat, float, 1, 2 ) = 0.f;
-CV_MAT_ELEM( mat, float, 2, 0 ) = 0.f;
-CV_MAT_ELEM( mat, float, 2, 1 ) = 0.f;
-CV_MAT_ELEM( mat, float, 2, 2 ) = 1.f;
-</pre>
-</ul>
-
-<hr><h3>How to process my data with OpenCV</h3>
-<p>
-Suppose, you have 300x200 32-bit floating point image/array, that
-resides in 60000-element array.
-<pre>
-int cols = 300, rows = 200;
-float* myarr = new float[rows*cols];
-
-// step 1) initializing CvMat header
-CvMat mat = cvMat( rows, cols,
- CV_32FC1, // 32-bit floating-point, single channel type
- myarr // user data pointer (no data is copied)
- );
-// step 2) using cv functions, e.g. calculating l2 (Frobenius) norm
-double norm = cvNorm( &mat, 0, CV_L2 );
-
-...
-delete myarr;
-</pre>
-Other scenaria are described in the reference manual.
-See cvCreateMatHeader, cvInitMatHeader, cvCreateImageHeader, cvSetData etc.
-</p>
-
-<hr><h3>How to load and display image</h3>
-<pre>
-/* usage: prog <image_name> */
-#include "cv.h"
-#include "highgui.h"
-
-int main( int argc, char** argv )
-{
- IplImage* img;
- if( argc == 2 && (img = cvLoadImage( argv[1], 1)) != 0 )
- {
- cvNamedWindow( "Image view", 1 );
- cvShowImage( "Image view", img );
- cvWaitKey(0); // very important, contains event processing loop inside
- cvDestroyWindow( "Image view" );
- cvReleaseImage( &img );
- return 0;
- }
- return -1;
-}
-</pre>
-
-<hr><h3>How to find and process contours</h3>
-<p>Look at <a href="../samples/c/squares.c">squares</a> demo</p>
-
-<hr><h3>How to calibrate camera using OpenCV</h3>
-<p>TODO</p>
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