opencv/samples/c/bgfg_codebook.cpp

// Background average sample code done with averages and done with codebooks
// (adapted from the OpenCV book sample)
// 
// NOTE: To get the keyboard to work, you *have* to have one of the video windows be active
//       and NOT the consule window.
//
// Gary Bradski Oct 3, 2008.
// 
/* *************** License:**************************
   Oct. 3, 2008
   Right to use this code in any way you want without warrenty, support or any guarentee of it working.

   BOOK: It would be nice if you cited it:
   Learning OpenCV: Computer Vision with the OpenCV Library
     by Gary Bradski and Adrian Kaehler
     Published by O'Reilly Media, October 3, 2008
 
   AVAILABLE AT: 
     http://www.amazon.com/Learning-OpenCV-Computer-Vision-Library/dp/0596516134
     Or: http://oreilly.com/catalog/9780596516130/
     ISBN-10: 0596516134 or: ISBN-13: 978-0596516130    
************************************************** */

#include "cvaux.h"
#include "cxmisc.h"
#include "highgui.h"
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

//VARIABLES for CODEBOOK METHOD:
CvBGCodeBookModel* model = 0;
const int NCHANNELS = 3;
bool ch[NCHANNELS]={true,true,true}; // This sets what channels should be adjusted for background bounds

void help(void)
{
    printf("\nLearn background and find foreground using simple average and average difference learning method:\n"
        "\nUSAGE:\nbgfg_codebook [--nframes=300] [movie filename, else from camera]\n"
        "***Keep the focus on the video windows, NOT the consol***\n\n"
        "INTERACTIVE PARAMETERS:\n"
        "\tESC,q,Q  - quit the program\n"
        "\th	- print this help\n"
        "\tp	- pause toggle\n"
        "\ts	- single step\n"
        "\tr	- run mode (single step off)\n"
        "=== AVG PARAMS ===\n"
        "\t-    - bump high threshold UP by 0.25\n"
        "\t=    - bump high threshold DOWN by 0.25\n"
        "\t[    - bump low threshold UP by 0.25\n"
        "\t]    - bump low threshold DOWN by 0.25\n"
        "=== CODEBOOK PARAMS ===\n"
        "\ty,u,v- only adjust channel 0(y) or 1(u) or 2(v) respectively\n"
        "\ta	- adjust all 3 channels at once\n"
        "\tb	- adjust both 2 and 3 at once\n"
        "\ti,o	- bump upper threshold up,down by 1\n"
        "\tk,l	- bump lower threshold up,down by 1\n"
        "\tSPACE - reset the model\n"
        );
}

//
//USAGE:  ch9_background startFrameCollection# endFrameCollection# [movie filename, else from camera]
//If from AVI, then optionally add HighAvg, LowAvg, HighCB_Y LowCB_Y HighCB_U LowCB_U HighCB_V LowCB_V
//
int main(int argc, char** argv)
{
    const char* filename = 0;
    IplImage* rawImage = 0, *yuvImage = 0; //yuvImage is for codebook method
    IplImage *ImaskCodeBook = 0,*ImaskCodeBookCC = 0;
    CvCapture* capture = 0;

    int c, n, nframes = 0;
    int nframesToLearnBG = 300;

    model = cvCreateBGCodeBookModel();
    
    //Set color thresholds to default values
    model->modMin[0] = 3;
    model->modMin[1] = model->modMin[2] = 3;
    model->modMax[0] = 10;
    model->modMax[1] = model->modMax[2] = 10;
    model->cbBounds[0] = model->cbBounds[1] = model->cbBounds[2] = 10;

    bool pause = false;
    bool singlestep = false;

    for( n = 1; n < argc; n++ )
    {
        static const char* nframesOpt = "--nframes=";
        if( strncmp(argv[n], nframesOpt, strlen(nframesOpt))==0 )
        {
            if( sscanf(argv[n] + strlen(nframesOpt), "%d", &nframesToLearnBG) == 0 )
            {
                help();
                return -1;
            }
        }
        else
            filename = argv[n];
    }

    if( !filename )
    {
        printf("Capture from camera\n");
        capture = cvCaptureFromCAM( 0 );
    }
    else
    {
        printf("Capture from file %s\n",filename);
        capture = cvCreateFileCapture( filename );
    }

    if( !capture )
    {
        printf( "Can not initialize video capturing\n\n" );
        help();
        return -1;
    }

    //MAIN PROCESSING LOOP:
    for(;;)
    {
        if( !pause )
        {
            rawImage = cvQueryFrame( capture );
            ++nframes;
            if(!rawImage) 
                break;
        }
        if( singlestep )
            pause = true;
        
        //First time:
        if( nframes == 1 && rawImage )
        {
            // CODEBOOK METHOD ALLOCATION
            yuvImage = cvCloneImage(rawImage);
            ImaskCodeBook = cvCreateImage( cvGetSize(rawImage), IPL_DEPTH_8U, 1 );
            ImaskCodeBookCC = cvCreateImage( cvGetSize(rawImage), IPL_DEPTH_8U, 1 );
            cvSet(ImaskCodeBook,cvScalar(255));
            
            cvNamedWindow( "Raw", 1 );
            cvNamedWindow( "ForegroundCodeBook",1);
            cvNamedWindow( "CodeBook_ConnectComp",1);
        }

        // If we've got an rawImage and are good to go:                
        if( rawImage )
        {
            cvCvtColor( rawImage, yuvImage, CV_BGR2YCrCb );//YUV For codebook method
            //This is where we build our background model
            if( !pause && nframes-1 < nframesToLearnBG  )
                cvBGCodeBookUpdate( model, yuvImage );

            if( nframes-1 == nframesToLearnBG  )
                cvBGCodeBookClearStale( model, model->t/2 );
            
            //Find the foreground if any
            if( nframes-1 >= nframesToLearnBG  )
            {
                // Find foreground by codebook method
                cvBGCodeBookDiff( model, yuvImage, ImaskCodeBook );
                // This part just to visualize bounding boxes and centers if desired
                cvCopy(ImaskCodeBook,ImaskCodeBookCC);	
                cvSegmentFGMask( ImaskCodeBookCC );
            }
            //Display
            cvShowImage( "Raw", rawImage );
            cvShowImage( "ForegroundCodeBook",ImaskCodeBook);
            cvShowImage( "CodeBook_ConnectComp",ImaskCodeBookCC);
        }

        // User input:
        c = cvWaitKey(10)&0xFF;
        c = tolower(c);
        // End processing on ESC, q or Q
        if(c == 27 || c == 'q')
            break;
        //Else check for user input
        switch( c )
        {
        case 'h':
            help();
            break;
        case 'p':
            pause = !pause;
            break;
        case 's':
            singlestep = !singlestep;
            pause = false;
            break;
        case 'r':
            pause = false;
            singlestep = false;
            break;
        case ' ':
            cvBGCodeBookClearStale( model, 0 );
            nframes = 0;
            break;
            //CODEBOOK PARAMS
        case 'y': case '0':
        case 'u': case '1':
        case 'v': case '2':
        case 'a': case '3':
        case 'b': 
            ch[0] = c == 'y' || c == '0' || c == 'a' || c == '3';
            ch[1] = c == 'u' || c == '1' || c == 'a' || c == '3' || c == 'b';
            ch[2] = c == 'v' || c == '2' || c == 'a' || c == '3' || c == 'b';
            printf("CodeBook YUV Channels active: %d, %d, %d\n", ch[0], ch[1], ch[2] );
            break;
        case 'i': //modify max classification bounds (max bound goes higher)
        case 'o': //modify max classification bounds (max bound goes lower)
        case 'k': //modify min classification bounds (min bound goes lower)
        case 'l': //modify min classification bounds (min bound goes higher)
            {
            uchar* ptr = c == 'i' || c == 'o' ? model->modMax : model->modMin;
            for(n=0; n<NCHANNELS; n++)
            {
                if( ch[n] )
                {
                    int v = ptr[n] + (c == 'i' || c == 'l' ? 1 : -1);
                    ptr[n] = CV_CAST_8U(v);
                }
                printf("%d,", ptr[n]);
            }
            printf(" CodeBook %s Side\n", c == 'i' || c == 'o' ? "High" : "Low" );
            }
            break;
        }
    }		
    
    cvReleaseCapture( &capture );
    cvDestroyWindow( "Raw" );
    cvDestroyWindow( "ForegroundCodeBook");
    cvDestroyWindow( "CodeBook_ConnectComp");
    return 0;
}