76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
#include "opencv2/video/tracking_c.h"
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#include "opencv2/highgui/highgui_c.h"
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#include "opencv2/imgproc/imgproc_c.h"
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#include <stdio.h>
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static void help(void)
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{
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printf(
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"\n This program demonstrate dense \"Farneback\n optical flow\n"
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"It read from camera 0, and shows how to use and display dense Franeback optical flow\n"
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"Usage: \n"
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"./fback_c \n");
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}
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static void drawOptFlowMap(const CvMat* flow, CvMat* cflowmap, int step,
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double scale, CvScalar color)
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{
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int x, y;
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(void)scale;
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for( y = 0; y < cflowmap->rows; y += step)
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for( x = 0; x < cflowmap->cols; x += step)
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{
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CvPoint2D32f fxy = CV_MAT_ELEM(*flow, CvPoint2D32f, y, x);
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cvLine(cflowmap, cvPoint(x,y), cvPoint(cvRound(x+fxy.x), cvRound(y+fxy.y)),
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color, 1, 8, 0);
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cvCircle(cflowmap, cvPoint(x,y), 2, color, -1, 8, 0);
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}
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}
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int main( int argc, char** argv )
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{
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CvCapture* capture = cvCreateCameraCapture(0);
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CvMat* prevgray = 0, *gray = 0, *flow = 0, *cflow = 0;
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(void)argc; (void)argv;
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help();
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if( !capture )
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return -1;
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cvNamedWindow("flow", 1);
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for(;;)
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{
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int firstFrame = gray == 0;
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IplImage* frame = cvQueryFrame(capture);
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if(!frame)
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break;
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if(!gray)
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{
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gray = cvCreateMat(frame->height, frame->width, CV_8UC1);
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prevgray = cvCreateMat(gray->rows, gray->cols, gray->type);
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flow = cvCreateMat(gray->rows, gray->cols, CV_32FC2);
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cflow = cvCreateMat(gray->rows, gray->cols, CV_8UC3);
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}
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cvCvtColor(frame, gray, CV_BGR2GRAY);
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if( !firstFrame )
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{
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cvCalcOpticalFlowFarneback(prevgray, gray, flow, 0.5, 3, 15, 3, 5, 1.2, 0);
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cvCvtColor(prevgray, cflow, CV_GRAY2BGR);
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drawOptFlowMap(flow, cflow, 16, 1.5, CV_RGB(0, 255, 0));
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cvShowImage("flow", cflow);
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}
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if(cvWaitKey(30)>=0)
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break;
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{
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CvMat* temp;
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CV_SWAP(prevgray, gray, temp);
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}
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}
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cvReleaseCapture(&capture);
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return 0;
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}
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