gistfile1.txt

#include <vector>
#include <iostream>
#include <dmtx.h>

#include <opencv2/opencv.hpp>

void decode(const cv::Mat& image){
    int width = image.cols;
    int height = image.rows;
 
    cv::Mat greyMat(width, height, CV_8UC1);
    cvtColor(image, greyMat, CV_BGR2GRAY);
 
    DmtxImage* img = dmtxImageCreate(greyMat.data, greyMat.cols, greyMat.rows, DmtxPack8bppK);
    DmtxDecode* dec = dmtxDecodeCreate(img, 1);
 
    DmtxTime timeout = dmtxTimeAdd(dmtxTimeNow(), 100);
 
    DmtxRegion* reg = dmtxRegionFindNext(dec, &timeout);
 
    if(reg != NULL) {
        DmtxMessage* msg = dmtxDecodeMatrixRegion(dec, reg, DmtxUndefined);
        if(msg != NULL) {
            std::cout << msg->output << std::endl;
            return;
        }
        dmtxRegionDestroy(&reg);
        dmtxMessageDestroy(&msg);
    }
    dmtxImageDestroy(&img);
    dmtxDecodeDestroy(&dec);
 
}

int main(int argc, char*argv[]) {
    CvCapture* capture = cvCaptureFromCAM( 0 );
    cvSetCaptureProperty( capture, CV_CAP_PROP_FRAME_WIDTH, 320 );
    cvSetCaptureProperty( capture, CV_CAP_PROP_FRAME_HEIGHT, 240 );

    if( capture == nullptr ) {
        return -1;
    }

    cv::namedWindow( "result", 1 );

    while( true ) {
        std::cout << "\n";
        cv::Mat frame = cvQueryFrame( capture );
        cv::imshow( "result", frame );
        cv::Mat grey;
        cv::cvtColor(frame, grey, CV_BGR2GRAY);

        cv::Mat bw;
        cv::threshold(grey, bw, 64, 255, cv::THRESH_BINARY);
        cv::imshow( "bw", bw );
        std::vector<std::string> codes;
        cv::findDataMatrix(bw, codes);
        decode(frame);

        for( auto i = codes.begin(); i != codes.end(); ++i) {
            std::cout << *i << '\n';
        }

        if(cvWaitKey(1)!=-1){
            break;
        }
    }

    return 0;
}