///////////////////////////////////////////////////////////////////////////// webcam.cpp --a part of libdecodeqr//// Copyright(C) 2007 NISHI Takao <zophos@koka-in.org>//                   JMA  (Japan Medical Association)//                   NaCl (Network Applied Communication Laboratory Ltd.)//// This is free software with ABSOLUTELY NO WARRANTY.// You can redistribute and/or modify it under the terms of LGPL.//// $Id: webcam.cpp 41 2007-02-25 19:42:28Z zophos $//#include <stdio.h>#include <string.h>#include <highgui.h>#include "../../libdecodeqr/decodeqr.h"int usage(char *program_name);int main(int argc,char *argv[]){    int show_bin_image=0;    if(argc>1){        if(strcmp(argv[1],"-d"))            return(usage(argv[0]));        else            show_bin_image=1;    }    //    // start camera    //    CvCapture *capture=cvCaptureFromCAM(0);    if(!capture)        return(-1);    //    // initialize qr decoder    //    QrDecoderHandle decoder=qr_decoder_open();    printf("libdecodeqr version %s\n",qr_decoder_version());        cvNamedWindow("src",1);    if(show_bin_image)        cvNamedWindow("bin",1);    puts("Hit [SPACE] key to grab, or any key to end.");    puts("");    //    // 1 shot grabing    //    //    // allocate grabed buffer to decoder    //    int key=-1;    IplImage *camera=cvQueryFrame(capture);    IplImage *src=NULL,*bin=NULL;    if(camera){        src=cvCloneImage(camera);        qr_decoder_set_image_buffer(decoder,src);    }    else        key=1;    unsigned char *text=NULL;    int text_size=0;    while(key<=0){        cvShowImage("src",camera);        key=cvWaitKey(150);        //        // when [SPACE] key pressed, do decode.        //        if(key==0x20&&!qr_decoder_is_busy(decoder)){            key=-1;            //            // if left-bottom origin (MS-Windows style) format,            // it must be converted to left-top origin.            //            if(camera->origin)                cvConvertImage(camera,src,CV_CVTIMG_FLIP);            else                cvCopy(camera,src);            //            // While decoding is a failure, decrease the            // adaptive_th_size parameter.            // Note that the adaptive_th_size must be odd.            //            short sz,stat;            for(sz=25,stat=0;                (sz>=3)&&((stat&QR_IMAGEREADER_DECODED)==0);                sz-=2)                stat=qr_decoder_decode(decoder,sz);            //            // for debug, show binarized image.            //            if(bin)                cvReleaseImage(&bin);            if(show_bin_image){                bin=cvCloneImage(qr_decoder_get_binarized_image_buffer(decoder));                cvShowImage("bin",bin);            }            printf("adaptive_th_size=%d, status=%04x\n",sz,stat);            //            // on suceed decoding, print decoded text.            //            QrCodeHeader header;            if(qr_decoder_get_header(decoder,&header)){                if(text_size<header.byte_size+1){                    if(text)                        delete text;                                        text_size=header.byte_size+1;                    text=new unsigned char[text_size];                }                qr_decoder_get_body(decoder,text,text_size);                printf("%s\n\n",text);                //                // draw found code region with green line                //                CvPoint *vertexes=qr_decoder_get_coderegion_vertexes(decoder);                CvPoint pt=vertexes[3];                int i;                for(i=0;i<4;i++){                    cvLine(src,pt,vertexes[i],CV_RGB(0,255,0),3);                    pt=vertexes[i];                }                //                // draw found finder patterns with green ellipse                //                CvBox2D *boxes=qr_decoder_get_finderpattern_boxes(decoder);                for(i=0;i<3;i++){                    CvSize sz=cvSize((int)boxes[i].size.width/2,                                     (int)boxes[i].size.height/2);                    cvEllipse(src,                              cvPointFrom32f(boxes[i].center),                              sz,                              boxes[i].angle,                              0,360,                              CV_RGB(0,255,0),2);                }                if(src->origin)                    cvConvertImage(src,src,CV_CVTIMG_FLIP);                cvShowImage("src",src);                //                // wait 1500msec.                //                key=cvWaitKey(1500);            }        }        camera=cvQueryFrame(capture);        if(!camera)            break;    }        if(text)        delete text;    qr_decoder_close(decoder);    if(bin)        cvReleaseImage(&bin);    if(src)        cvReleaseImage(&src);            cvReleaseCapture(&capture);    return(0);}int usage(char *program_name){    fprintf(stderr,"usage: %s [-d|-h]\n",program_name);    fprintf(stderr,"-d\tturn on debug mode.\n");    fprintf(stderr,"-h\tshow thismessage and quit.\n\n");        return(-1);}