Beerpong/beerpong/src/ofApp.cpp

#include "ofApp.h"

#define VIDEO_WIDTH 568
#define VIDEO_HEIGHT 320

//--------------------------------------------------------------
void ofApp::setup(){
	vidPlayer.load("beer.mkv"); // in /bin/data/
	vidPlayer.play();
	vidPlayer.setLoopState(OF_LOOP_NORMAL);

	colorVideo.allocate(VIDEO_WIDTH, VIDEO_HEIGHT);
	grayVideo.allocate(VIDEO_WIDTH, VIDEO_HEIGHT);

	learnBackground = true;
	threshhold = 80;
}

//--------------------------------------------------------------
void ofApp::update(){

	vidPlayer.update();
	colorVideo.setFromPixels(vidPlayer.getPixels());

	grayVideo = colorVideo; // Convert Color to Grayscale

	if (learnBackground){
		background = grayVideo;
		learnBackground = false;
	}

	// Background subtraction
	binarized.absDiff(background, grayVideo);
	// Binarization
	binarized.threshold(threshhold);

	contourFinder.findContours(
		binarized,
		10,
		VIDEO_HEIGHT * VIDEO_WIDTH / 10,
		10,
		true);
}

//--------------------------------------------------------------
void ofApp::draw(){
	ofSetHexColor(0xffffff);
	colorVideo.draw(20, 20);
	grayVideo.draw(40 + VIDEO_WIDTH, 20);
	background.draw(20, 40 + VIDEO_HEIGHT);
	binarized.draw(40 + VIDEO_WIDTH, 40 + VIDEO_HEIGHT);

	ofFill();
	ofSetHexColor(0x333333);
	ofDrawRectangle(40 + VIDEO_WIDTH, 60 + VIDEO_HEIGHT + VIDEO_HEIGHT, VIDEO_WIDTH, VIDEO_HEIGHT);
	ofSetHexColor(0xffffff);

	for (int i = 0; i < contourFinder.blobs.size(); i++) {
		ofxCvBlob blob = contourFinder.blobs[i];
		

		// draw over the centroid if the blob is a hole
		ofSetColor(255);

		// https://docs.opencv.org/master/d1/d32/tutorial_py_contour_properties.html
		float aspect_ratio = blob.boundingRect.getWidth() / blob.boundingRect.getHeight();

		stringstream sizeStr;
		sizeStr << std::to_string(i) << ": " << std::to_string(contourFinder.blobs[i].area);
		sizeStr << " | F=" << aspect_ratio;


		if (aspect_ratio > 0.5 && aspect_ratio < 1.5)
		{
			blob.draw(40 + VIDEO_WIDTH, 60 + VIDEO_HEIGHT + VIDEO_HEIGHT);
			ofDrawBitmapString(sizeStr.str(),
				contourFinder.blobs[i].boundingRect.getCenter().x + 40 + VIDEO_WIDTH,
				contourFinder.blobs[i].boundingRect.getCenter().y + 60 + VIDEO_HEIGHT + VIDEO_HEIGHT);
		}
	}
}

//--------------------------------------------------------------
void ofApp::keyPressed(int key){
	if (key == '-') threshhold--;
	else if (key == '+') threshhold++;
	else if (key == ' ') learnBackground = true;
	else if (key == '0') vidPlayer.setPaused(!vidPlayer.isPaused());
	else if (key == OF_KEY_RIGHT) vidPlayer.nextFrame();
	else if (key == OF_KEY_LEFT) vidPlayer.previousFrame();
	else;
}

//--------------------------------------------------------------
void ofApp::keyReleased(int key){

}

//--------------------------------------------------------------
void ofApp::mouseMoved(int x, int y ){

}

//--------------------------------------------------------------
void ofApp::mouseDragged(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mousePressed(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mouseReleased(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mouseEntered(int x, int y){

}

//--------------------------------------------------------------
void ofApp::mouseExited(int x, int y){

}

//--------------------------------------------------------------
void ofApp::windowResized(int w, int h){

}

//--------------------------------------------------------------
void ofApp::gotMessage(ofMessage msg){

}

//--------------------------------------------------------------
void ofApp::dragEvent(ofDragInfo dragInfo){ 

}