Mémoire de master recherche.

Annexes

1. Programme en C ++ pour la détection par différence d'images

#include "highgui.h"

#include "cv.h"

int seuil_diff = 30;

IplImage *prev_img = 0;

IplImage *curr_img = 0;

void MotionDetection(IplImage* img, IplImage* dst, int diff_threshold)

{

cvCvtColor(img, curr_img, CV_BGR2GRAY);

IplImage* silh = cvCreateImage(cvGetSize(img), IPL_DEPTH_8U, 1);

cvAbsDiff(prev_img, curr_img, silh);

cvThreshold(silh, silh, diff_threshold, 255, CV_THRESH_BINARY);

cvCopy(curr_img, prev_img);

cvMerge(silh, 0,0,0, dst);

cvReleaseImage(&silh);

}

// programme principal

int main()

{

CvCapture* capture = 0;

IplImage *frame = 0;

capture = cvCreateFileCapture("video.avi");

IplImage *video_image = 0, *motion = 0;

for(;;)

{

frame = cvQueryFrame(capture);

if (!frame)

break;

// Création initiale des tableaux utiles

if (!video_image)

{

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video_image = cvCreateImage(cvGetSize(frame),8,3);

motion = cvCreateImage(cvGetSize(video_image),8,3);

prev_img = cvCreateImage(cvGetSize(frame),IPL_DEPTH_8U,1);

curr_img = cvCreateImage(cvGetSize(frame),IPL_DEPTH_8U,1);

cvZero(prev_img);

}

// Origine de l'image = coin haut gauche

if (frame -> origin == 1)

cvFlip(frame, video_image, 1);

else

cvCopy(frame, video_image, 0);

// Detection de mouvement

MotionDetection(video_image, motion, seuil_diff);

// Affichage des resultats

cvNamedWindow("video_image", 1);

cvShowImage("video_image", frame);

cvNamedWindow("frame",0);

cvShowImage("frame", curr_img);

cvNamedWindow("motion", 0);

cvShowImage("motion", motion);

cvCreateTrackbar("seuil_diff", "motion", &seuil_diff, 60, 0);

int delay = 30;

if (cvWaitKey(delay)>= 0)

break;

}

// Sortie du programme

cvReleaseCapture(&capture);

cvReleaseImage(&video_image);

cvReleaseImage(&motion);

cvReleaseImage(&prev_img);

cvReleaseImage(&curr_img);

}

return 0;

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2. Programme en C++ pour la détection par soustraction d'arrière-plan

#include <stdio.h>

#include <stdlib.h>

#include <opencv/highgui.h>

#include <opencv/cv.h>

//void MotionDetection(IplImage* img, IplImage* dst, int diff_threshold);

//IplImage *prev_img=0, *curr_img =0;

IplImage *video_image = 0, *motion = 0, *ref_img=0;

int seuil_diff = 50;

int N =20;

IplImage *buf[20];

int last=0;

void MotionDetection(IplImage* img, IplImage* dst, int diff_threshold)

{

cvCvtColor(img, buf[last], CV_BGR2GRAY);//image courante int idx1 = last;// indice de l'image courante (à t) int idx2 = (last + 1)% N;

last = idx2; // indice de la prochaine image (à t+1)

IplImage* moyenne = cvCreateImage(cvGetSize(img),32,1); IplImage* silh = cvCreateImage(cvGetSize(img),8,1); cvZero(moyenne);

int i;

for (i = 0;i<N;i++)

if (i!=idx1) //exclusion de l'image courante

cvAcc (buf[i],moyenne,0);// somme des N-1 images précédentes cvConvertScale(moyenne, ref_img, 1./(N-1),0); cvReleaseImage(&moyenne);

cvAbsDiff(buf[idx1], ref_img, silh);

cvThreshold(silh, silh, diff_threshold, 255, CV_THRESH_BINARY); cvMerge(0, silh,0,0,dst); //mouvement en vert cvReleaseImage(&silh);

}

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int main()

{

CvCapture* capture = 0;

IplImage* frame = 0;

capture = cvCreateFileCapture("video.avi");

for(;;)

{

frame = cvQueryFrame(capture);

if (!frame)

break;

//creation des tableaux utiles

if (!video_image)

{

video_image = cvCreateImage(cvGetSize(frame), 8, 3);

motion = cvCreateImage(cvGetSize(video_image),8,3);

ref_img = cvCreateImage(cvGetSize(frame),IPL_DEPTH_8U,1);

int i;

for(i=0;i<N;i++)

{

buf[i]=cvCreateImage(cvGetSize(frame),IPL_DEPTH_8U,1);

cvZero(buf[i]);

}

}

//origine de l'image = coin haut gauche

if (frame->origin == 1)

cvFlip(frame, video_image, -1);

else

cvCopy(frame, video_image,NULL);

//detection de mouvement

MotionDetection(video_image, motion, seuil_diff);

//affichage des résultats

cvNamedWindow("Vidéo_Source",0);

cvShowImage("Vidéo_Source", video_image);

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cvNamedWindow("Moyenne",0); cvShowImage("Moyenne", ref_img); cvNamedWindow("Icourante",1); cvShowImage("Icourante", buf[last]); cvNamedWindow("motion",0); cvShowImage("motion", motion); cvCreateTrackbar("seuil_diff", "motion", &seuil_diff, 100,0); int delay = 5;

if (cvWaitKey(delay)>=0)

break;

}

//sortie du programme

cvReleaseCapture(&capture); cvReleaseImage(&video_image); cvReleaseImage(&motion); cvReleaseImage(&ref_img); int i;

for(i=0;i<N;i++)

cvReleaseImage(&buf[i]); return 0;

}