#include "opencv2/videoio/videoio.hpp"#include "opencv2/highgui/highgui.hpp"#include "opencv2/imgproc/imgproc.hpp"#include <opencv2/core/utility.hpp>#include <ctype.h>#include <stdio.h>#include <iostream>using namespace cv;using namespace std;static void help(){    cout <<            "\nThis program demonstrates Laplace point/edge detection using OpenCV function Laplacian()\n"            "It captures from the camera of your choice: 0, 1, ... default 0\n"            "Call:\n"            "./laplace -c=<camera #, default 0> -p=<index of the frame to be decoded/captured next>\n" << endl;}enum {GAUSSIAN, BLUR, MEDIAN};int sigma = 3;int smoothType = GAUSSIAN;int main( int argc, char** argv ){    VideoCapture cap;    cv::CommandLineParser parser(argc, argv, "{help h | | }{ c | 0 | }{ p | | }");    if ( parser.has("help") )    {        help();        return 0;    }    if( parser.get<string>("c").size() == 1 && isdigit(parser.get<string>("c")[0]) )    {        cout << "debug 1:" << parser.get<int>("c") << endl;        cap.open(parser.get<int>("c"));    }    else    {        cout << "debug 2:" << parser.get<string>("c") << endl;        cap.open(parser.get<string>("c"));    }    if( cap.isOpened() )        cout << "Video " << parser.get<string>("c") <<            ": width=" << cap.get(CAP_PROP_FRAME_WIDTH) <<            ", height=" << cap.get(CAP_PROP_FRAME_HEIGHT) <<            ", nframes=" << cap.get(CAP_PROP_FRAME_COUNT) << endl;    // Jeff --> "nframes == -1"    // try to return more frames?    if( parser.has("p") )    {        int pos = parser.get<int>("p");        if (!parser.check())        {            parser.printErrors();            return -1;        }        cout << "seeking to frame #" << pos << endl;        cap.set(CAP_PROP_POS_FRAMES, pos);    }    if( !cap.isOpened() )    {        cout << "Could not initialize capturing...\n";        return -1;    }    namedWindow( "Laplacian", 0 );    createTrackbar( "Sigma", "Laplacian", &sigma, 15, 0 );    CvSize size1 = cvSize(                (int)cap.get(CAP_PROP_FRAME_WIDTH),                (int)cap.get(CAP_PROP_FRAME_HEIGHT));    CvVideoWriter* wrVideo1 = cvCreateVideoWriter("./my.mp4", CV_FOURCC(‘P‘,‘I‘,‘M‘,‘1‘), 32, size1);    // CV_FOURCC:    // CV_FOURCC(‘P‘,‘I‘,‘M‘,‘1‘)    MPEG-1 codec    // CV_FOURCC(‘M‘,‘J‘,‘P‘,‘G‘)    motion-jpeg codec (does not work well)    // CV_FOURCC(‘M‘, ‘P‘, ‘4‘, ‘2‘) MPEG-4.2 codec    // CV_FOURCC(‘D‘, ‘I‘, ‘V‘, ‘3‘) MPEG-4.3 codec    // CV_FOURCC(‘D‘, ‘I‘, ‘V‘, ‘X‘) MPEG-4 codec    // CV_FOURCC(‘U‘, ‘2‘, ‘6‘, ‘3‘) H263 codec    // CV_FOURCC(‘I‘, ‘2‘, ‘6‘, ‘3‘) H263I codec    // CV_FOURCC(‘F‘, ‘L‘, ‘V‘, ‘1‘) FLV1 codec    Mat smoothed, laplace, result;    for(;;)    {        Mat frame;        cap >> frame;        if( frame.empty() )            break;        /*         * Step 1: 高斯，均值， 中值         */        int ksize = (sigma*5)|1;        if(smoothType == GAUSSIAN)            GaussianBlur(frame, smoothed, Size(ksize, ksize), sigma, sigma);        else if(smoothType == BLUR)            blur(frame, smoothed, Size(ksize, ksize));        else            medianBlur(frame, smoothed, ksize);        /*         * Step 2: extract edges.         *     In: smoothed.         *    Out: laplace.         */        Laplacian(smoothed, laplace, CV_16S, 5);        convertScaleAbs(laplace, result, (sigma+1)*0.25);        imshow("Laplacian", result);        /*         * Jeff --> We may try any other Algorithm here,         * such as sobel.        int c = waitKey(30);        if( c == ‘ ‘ )            smoothType = smoothType == GAUSSIAN ? BLUR : smoothType == BLUR ? MEDIAN : GAUSSIAN;        if( c == ‘q‘ || c == ‘Q‘ || (c & 255) == 27 )            break;        IplImage copy = result;        IplImage* new_image = copy;        cvWriteFrame( wrVideo1, new_image );    }    cvReleaseVideoWriter( &wrVideo1 );    cvDestroyWindow( "Laplacian" );    return 0;}