Here is a brief description of compiling and running OpenCV’s facedetect sample on Pocket PC.

Compiling

I used Visual Studio 2005 Team Suite edition to compile OpenCV 1.1 pre 1. It compiled without any trouble for Win32.

Then I tried to compile for Pocket PC (set Platform to Pocket PC 2003 (ARMV4)). Some compilation errors occured. As I only needed to compile a facedetect sample, I decided to compile the necessary files only.

To build cxcore I had to change the following:

cxmisc.h, line 125 to
#elif defined WIN32 || defined WIN64 || defined WINCE

cxswitcher.cpp, line 57 to
#if defined WIN32 || defined WIN64 || defined WINCE

line 90 to
#if defined WIN32 && !defined  WIN64 && !defined WINCE

line 137, 140: constants wrapped in #ifdef
#ifndef WINCE
           “HARDWARE\\DESCRIPTION\\SYSTEM\\CentralProcessor\\0\\”,
#else
           L”HARDWARE\\DESCRIPTION\\SYSTEM\\CentralProcessor\\0\\”,
#endif
#ifndef WINCE
               “~MHz”,
#else
               L”~MHz”,
#endif

approx line 435, 600: added name translation
#ifdef WINCE
                    size_t origsize = strlen(name) + 1;
                    WCHAR wname[100];
                    MultiByteToWideChar(CP_ACP,0,name,origsize,wname,100);
                    addr = (uchar*)GetProcAddress( plugins[idx].handle, wname );
#else
                    addr = (uchar*)GetProcAddress( plugins[idx].handle, name );
#endif

cxerror.cpp line 45 to
#if defined WIN32 || defined WIN64 || defined WINCE

line 92 added
#define TLS_OUT_OF_INDEXES ((DWORD)0xFFFFFFFF)

line with DllMain to
#if defined WIN32 || defined WIN64
BOOL WINAPI DllMain(
#ifdef WINCE
                    HANDLE
#else
                    HINSTANCE
#endif
                    , DWORD  fdwReason, LPVOID )

a fragment in cvGuiBoxReport to
        sprintf( message, “%s (%s)\nin function %s, %s(%d)\n\n”
                  “Press \”Abort\” to terminate application.\n”
                  “Press \”Retry\” to debug (if the app is running under debugger).\n”
                  “Press \”Ignore\” to continue (this is not safe).\n”,
                  cvErrorStr(code), err_msg ? err_msg : “no description”,
                  func_name, file, line );

        sprintf( title, “OpenCV GUI Error Handler” );

#ifdef WINCE
        WCHAR wmsg[2048];
        MultiByteToWideChar(CP_ACP,0,title,strlen(message),wmsg,2048);
        int answer = MessageBox( NULL, wmsg, L”OpenCV GUI Error Handler”, MB_ICONERROR|MB_ABORTRETRYIGNORE);
#else
        int answer = MessageBox( NULL, message, title, MB_ICONERROR|MB_ABORTRETRYIGNORE|MB_SYSTEMMODAL );
#endif

Changed preprocessor definitions to
NDEBUG;_WIN32_WCE=$(CEVER);UNDER_CE;$(PLATFORMDEFINES);WINCE;_WINDOWS;_USRDLL;CV_CE_EXPORTS;$(ARCHFAM);$(_ARCHFAM_);_UNICODE;UNICODE

Subsystem to
WindowsCE (/SUBSYSTEM:WINDOWSCE)

Target machine to
MachineARM (/MACHINE:ARM)

Added dependency to
secchk.lib

After building cxcore, import library (.lib) was not generated for some reason. I was not able to resolve this, but as I only needed a running sample, i setup a new project and added all the necessary source from existing opencv projects to it. That is, cxcore, cv and some files from highgui.

I had to turn off precompiled headers (as the header file was different in cxcore and other projects).

There were linking errors in cvkdtree.obj, so i just removed cvkdtree.cpp from compilation as it was not needed for my sample.

cvconfig.h file was added to cv/include directory

..\..\otherlibs\highgui added to include paths

Only loadsave.cpp, utils.cpp and window_w32.cpp from highgui root were added to sample project. grfmts contents were also added.

As cvShowImage implementation was not added, i removed it from cxcore.h:
#ifndef WINCE
#define CV_SET_IMAGE_IO_FUNCTIONS() \
    cvSetImageIOFunctions( cvLoadImage, cvLoadImageM, cvSaveImage, cvShowImage )
#else
#define CV_SET_IMAGE_IO_FUNCTIONS() \
    cvSetImageIOFunctions( cvLoadImage, cvLoadImageM, cvSaveImage, NULL )
#endif

Running sample application

I changed a facedetect sample so that not to use gui. With these changes, facedtetect sample works fine both on emulator and Pocket PC.
I have to use .bmp files however as jpg files were not loaded properly.

Speaking about emulator, there is something wrong with the timing, the fragment
    log_to_file(“Test app started”);
    Sleep(1000);
    log_to_file(“This should be logged approximately 1 second after start”);
generates log
000000.063ms: Test app started
000966.265ms: This should be logged approximately 1 second after start.
However, it looks as expected on the real device.

It turned out that release version built with floating point emulation takes approximately same time as the version built with emulation (/QRfpe). I tested this on emulator only.
Generally, simulator is very slow.

I used a 640×480 24bit sample with 4 faces. Here are the results
4 face(s) detected in 000702.286ms // my PC
4 face(s) detected in 329986.632ms // emulator and a build without fp emulation
4 face(s) detected in 334343.969ms // emulator and a build with fp emulation
4 face(s) detected in 066759.889ms// Fujitsu Siemens Pocket Loox PXA270 – 624Mhz and a build without fp emulation