>元々は [[DSE:http://dse.ssi.ist.hokudai.ac.jp/]] の wiki にあったコンテンツです。 >現状とは異なる点が多々あるかもしれません。ご了承ください。 [[研究]] #contents * What's CameraAgentPlugIn ? [#k70975b8] CameraAgentPlugIn suit provides an abstract layer (functions) to access various kinds of camera and capture devices (such as USB Camera[WDM or VfW], ViewRanger[HTTP and JPEG decoder]). So you can use such devices via a DLL of this suit. YES, NO NEED to make long long and too complicated codes like an use of DirectShow API. Your task is so simple : make an instance of CameraAgentPlugIn class and call only a few methods. Is the name of this suits curious ? It has long history but i can't describe it in english orz. * ARCHITECTURE [#g9115a27] #ref(研究/カメラエージェント君/DeploymentDiagram.png,,60%) This suit is part of an architecture in a diagram above. Your software is "Applications" in the diagram, and it connects via "Direct DLL Manipulation". * HOW TO USE [#xff44e3a] This is fragment code of ConsoleExample.cpp . Firstly, you specify the include operation at the top of your source. #include "CameraAgentPlugIn.h" In "main" function, you'll make an instance of CameraAgentPlugIn class and manipulate it. // make an instance of CameraAgentPlugIn CameraAgentPlugIn capi; Call "Open" and "OnInit" method to open and initialize the dll. After calling "OnInit" method, you can retrieve the device information from a member-variable named strDeviceName_. // Call "Open" method to open dll. you can change dll filename as you need the type of device if( !capi.Open( "WdmReader.dll" ) ) { printf( "cannot open DLL : %s\n", capi.strDllFilename_.c_str() ); return -1; } // Call "OnInit" method to initialize dll, an argument is HWND of parent window. // some type of dll (mainly "VfwReader.dll") has to be supplid the parent window handle. // but almost DLLs don't need HWND, you specify it as NULL simply. if( !capi.OnInit( NULL ) ) { printf( "fault to initialize DLL\n" ); return -1; } // device(DLL) info. printf( "DLL:%s\n", capi.strDeviceName_.c_str() ); If your application needs specific resolution, you have to set the resolution by calling "SetResolution" method. If not, the resolution of the captured image is a default value of dll or device; all WDM-type device has the default resolution suitable for its porposes or spec. // set/get resolution (if you need) capi.SetResolution( 640, 480 ); long width = 0, height = 0; capi.GetResolution( &width, &height ); Call "Capture" method to get the image of device. The captured image is an instance of KImageRGB class. KImageRGB is supporting class for imaging operations; get width/height of image, color of pixel, raw buffer pointer of the image. // capturing KImageRGB image; if( !capi.Capture( image ) ) { printf( "fault capturing...\n" ); return -1; } Here is the sample code of KImageRGB class but it's useful i thought. Make brightness histogram of image. It's pretty simple. // make brightness histogram ( N_DIV is a number of class ) #define N_DIV 8 int np[N_DIV] = {0}; int y = 0; for( y=0; y<image.height; y++ ) { for( int x=0; x<image.width; x++ ) { K_RGB p = image.pixel(x,y); // calc. histogram int g = (p.r+p.g+p.b)/3; for( int i=0; i<N_DIV; i++ ) { int lower_bound = 256*i/N_DIV; int upper_bound = 256*(i+1)/N_DIV; if( lower_bound <= g && g < upper_bound ) { np[i] ++; continue; // exactly, you don't need this. } } } } // show histogram int n = 0, i = 0; for( i=0; i<N_DIV; i++ ) n += np[i]; for( i=0; i<N_DIV; i++ ) { int lower_bound = 256*i/N_DIV; int upper_bound = 256*(i+1)/N_DIV; printf( "%3d-%3d:%6d: ", lower_bound, upper_bound-1, np[i] ); int x = np[i]*70/n; for( int i=0; i<x; i++ ) putchar( '*' ); printf( "\n" ); } KImageRGB class has a function to save the image to bitmap file. 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