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#include "testApp.h"
//--------------------------------------------------------------
void testApp::setup(){
#ifdef _USE_LIVE_VIDEO
vidGrabber.setVerbose(true);
vidGrabber.initGrabber(320,240);
#else
vidPlayer.loadMovie("camoutput.mov");
vidPlayer.play();
#endif
colorImg.allocate(320,240);
grayImage.allocate(320,240);
grayBg.allocate(320,240);
grayDiff.allocate(320,240);
bLearnBakground = true;
threshold = 80;
}
//--------------------------------------------------------------
void testApp::update(){
ofBackground(100,100,100);
bool bNewFrame = false;
#ifdef _USE_LIVE_VIDEO
vidGrabber.grabFrame();
bNewFrame = vidGrabber.isFrameNew();
#else
vidPlayer.idleMovie();
bNewFrame = vidPlayer.isFrameNew();
#endif
if (bNewFrame){
#ifdef _USE_LIVE_VIDEO
colorImg.setFromPixels(vidGrabber.getPixels(), 320,240);
#else
colorImg.setFromPixels(vidPlayer.getPixels(), 320,240);
#endif
grayImage = colorImg;
if (bLearnBakground == true){
grayBg = grayImage; // the = sign copys the pixels from grayImage into grayBg (operator overloading)
bLearnBakground = false;
}
// take the abs value of the difference between background and incoming and then threshold:
grayDiff.absDiff(grayBg, grayImage);
grayDiff.threshold(threshold);
// find contours which are between the size of 20 pixels and 1/3 the w*h pixels.
// also, find holes is set to true so we will get interior contours as well....
contourFinder.findContours(grayDiff, 20, (340*240)/3, 10, true); // find holes
}
}
//--------------------------------------------------------------
void testApp::draw(){
// draw the incoming, the grayscale, the bg and the thresholded difference
ofSetHexColor(0xffffff);
colorImg.draw(20,20);
grayImage.draw(360,20);
grayBg.draw(20,280);
grayDiff.draw(360,280);
// then draw the contours:
ofFill();
ofSetHexColor(0x333333);
ofRect(360,540,320,240);
ofSetHexColor(0xffffff);
// we could draw the whole contour finder
//contourFinder.draw(360,540);
// or, instead we can draw each blob individually,
// this is how to get access to them:
for (int i = 0; i < contourFinder.nBlobs; i++){
contourFinder.blobs[i].draw(360,540);
}
// finally, a report:
ofSetHexColor(0xffffff);
char reportStr[1024];
sprintf(reportStr, "bg subtraction and blob detection\npress ' ' to capture bg\nthreshold %i (press: +/-)\nnum blobs found %i, fps: %f", threshold, contourFinder.nBlobs, ofGetFrameRate());
ofDrawBitmapString(reportStr, 20, 600);
float gap=ofGetHeight()-ofGetWidth();
ofTranslate(0,ofGetHeight(),0);
ofRotate(cam_angle,1,0,0);
ofTranslate(0,-ofGetHeight(),0);
for (float i=0;i<ofGetWidth();i+=ofGetWidth()/10) {
glBegin(GL_LINES);
glVertex3f(i,gap,0);
glVertex3f(i,ofGetHeight(),0);
glEnd();
glBegin(GL_LINES);
glVertex3f(0,i+gap,0);
glVertex3f(ofGetWidth(),i+gap,0);
glEnd();
}
}
//--------------------------------------------------------------
void testApp::keyPressed(int key){
switch (key){
case ' ':
bLearnBakground = true;
break;
case '+':
threshold ++;
if (threshold > 255) threshold = 255;
break;
case '-':
threshold --;
if (threshold < 0) threshold = 0;
break;
case 'a':
cam_angle+=1;
break;
case 'z':
cam_angle-=1;
break;
}
}
//--------------------------------------------------------------
void testApp::keyReleased(int key){
}
//--------------------------------------------------------------
void testApp::mouseMoved(int x, int y ){
}
//--------------------------------------------------------------
void testApp::mouseDragged(int x, int y, int button){
}
//--------------------------------------------------------------
void testApp::mousePressed(int x, int y, int button){
}
//--------------------------------------------------------------
void testApp::mouseReleased(int x, int y, int button){
}
//--------------------------------------------------------------
void testApp::windowResized(int w, int h){
}
//--------------------------------------------------------------
void testApp::gotMessage(ofMessage msg){
}
//--------------------------------------------------------------
void testApp::dragEvent(ofDragInfo dragInfo){
}
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