simple ball game by colored object motion tracking - image processing opencv javacv

DEMO VIDEO:  simple ball game by colored object motion tracking - using javacv opencv to detect the path of moving object. This is earliest version of the game.


Full Code :
Java Collision Detection and bounce

Colored object tracking in java- javacv code

You need to integrate the ideas from above links.
The full (integrated code will be uploaded shortly)

most Guaranteed job forever - programming

Programming is basically guaranteed employment forever ?


So, my summary line is rather hyperbolic, but I firmly believe that there is almost no better skill to learn than computer programming.  It's impossible to predict what jobs will be most in demand in the future, and thirty years ago I probably would've told you that the world will always need typewriter repairers, but computers and computer software are here for the long haul, and being an expert on exactly how they work will be a very good thing to be.  Even if "programming" isn't exactly where it's at in another thirty years, it'll be a good stepping stone.



For the now, there are available jobs programming in almost every city in the civilized world.  If you're a good programmer and interview well, you could probably work for any city you wanted to with almost any company.  That said, it's a little easier to spot a bad programmer in an interview than it is to spot a bad lawyer or a bad accountant, so if you're NOT that great a programmer or you interview very poorly, those jobs may not be as open to you.

So hopefully I've established that being a programmer is one of the best career choices you can possibly make, unless you want to go with being a lawyer or a doctor or an oil baron.  Still, the important thing is that you enjoy it.  Learn programming because programming interests you, that's the important thing.  I know some programmers who did it for the money.  They turn out to be bad programmers, and, worse, they hate their jobs.  Do what you love, even if you end up poor and doing what you love.  Really.

So now your question is "how."  That's tougher.  You can learn in lots of ways.  One way would be to pick up pretty much any programming language.  Once you've learned how to think like a programmer, you're 90% of the way there.  Learn Java, C, or whatever you like.  The best advice I can give you is to think of a very, very, VERY small program to write (tic tac toe), and then go out and write that program.  Pick any language you like and feel free to switch.  Java's a decent starting language, but there are plenty of choices.

One of the first thing you'll realize about programmers is that when multiple choices are roughly equivalent, fierce camps will emerge on all sides.  "What language should Ilearn first" is a good example.  Some folks will insist that you learn by writing programs exclusively on paper in a made-up language.

Getting help and reading tutorials are good things.  If you're in school, try to take programming classes.  If you're out of school, it's harder.  Beware of the books like "Learn Everything About Being a Java Programmer in 7 Days and Also Get Certified."  Some of these are good, but most are bad.  On the other hand, it's not a bad idea to wander around the computer section of the bookstore or library and thumb through everything that looks interesting.  The more ideas you're exposed to, the better.

I can't overemphasize the importance of play.  Write little 5-10 line programs to do whatever.  Try them out.  Change them around and see what they do.  Grab small example programs and add a feature.

Programming friends are important.  Find a friend who's a decent programmer and pester them with all sorts of questions about particular things you're stuck with or don't understand.  Askville's not a bad place to ask specific questions, either.

# Sites to ask programming QA

src : http://askville.amazon.com/Career-programming/AnswerViewer.do?requestId=5369343

Object tracking in Java - detect position of colored spot in image

Red spot in image - position to be detected later

Object Tracking plays important role in Image Processing research projects. In this example, I am showing how we can detect the position [(x, y) coordinates ] of a colored spot in given image using JavaCV (Java wrapper for OpenCV ).



Input image :
This image has a red colored spot. And our objective is to track the position coordinate of the spot in image.The example below uses thresholding in HSV space and simple moment calculations given in OpenCV library.





You can use this code to track an object in a video sequence - say live web-cam capture video.

• The code for capturing webcam using JavaCV is here.
• Help on Configuring a JavaCV project in Eclipse+windows is here.

Detecting Position of a spot in Threshold image:

    static Dimension getCoordinates(IplImage thresholdImage) {
        int posX = 0;
        int posY = 0;

JavaCV: Image Thresholding HSV color space

JavaCV (OpenCv) example of image thresholding based on color in HSV-A Space - to detect red color spot on given image. Useful in object tracking.

Java Source Code:

//imports
import static com.googlecode.javacv.cpp.opencv_core.*;
import static com.googlecode.javacv.cpp.opencv_highgui.*;
import static com.googlecode.javacv.cpp.opencv_imgproc.*;
import com.googlecode.javacv.cpp.opencv_core.CvScalar;
import com.googlecode.javacv.cpp.opencv_core.IplImage;

public class ColorDetect {

Java Sound : audio inputstream from pcm amplitude array

In this post, i am going to show the code for creating the AudioInputStream from an PCM - amplitude array. It basically converts the int [] array to byte array according to AudioFormat.

The code for the reverse operation (extract amplitude array from recorded wave file or AudioStream )is in my earlier post : http://ganeshtiwaridotcomdotnp.blogspot.com/2011/12/java-extract-amplitude-array-from.html

The code for converting PCM amplitude array to AudioStream is follows :

Java Sound : generate play sine wave - source code

Working source code example on how to generate and play sine wave in Java :
View my previous post  for playing any PCM amplitude array.

Generate Sine wave of a particular frequency :

    private static byte[] generateSineWavefreq(int frequencyOfSignal, int seconds) {
        // total samples = (duration in second) * (samples per second)
        byte[] sin = new byte[seconds * sampleRate];
        double samplingInterval = (double) (sampleRate / frequencyOfSignal);
        System.out.println("Sampling Frequency  : "+sampleRate);
        System.out.println("Frequency of Signal : "+frequencyOfSignal);
        System.out.println("Sampling Interval   : "+samplingInterval);
        for (int i = 0; i < sin.length; i++) {
            double angle = (2.0 * Math.PI * i) / samplingInterval;
            sin[i] = (byte) (Math.sin(angle) * 127);
            System.out.println("" + sin[i]);
        }

Java Audio : Playing PCM amplitude Array

How to play a array of PCM amplitude values (integer or float array) in Java - Steps

Basic Steps :

//initialize source data line - for playback
SourceDataLine line = AudioSystem.getSourceDataLine(audioFormat);
line.open(audioFormat);
line.start();

//play the byteArray
line.write(byteArray, 0,  byteArray .length);//(byte[] b, int off, int len)
line.drain();
line.close();

Converting integer array to bytearray :
We need to convert our PCM array to byteArray because the line.write requires byte[] b as parameter.

Java extract amplitude array from recorded wave

Extract amplitude array from recorded/saved wav : From File , AudioInputStream , ByteArray of File or ByteArrayInputStream - working java source code example

 import java.io.ByteArrayInputStream;  
 import java.io.File;  

Sound (audio file) player in java - working source code example

Sound (audio file) player in java - working source code example

 import java.io.File;  
 import java.io.IOException;  
 import javax.sound.sampled.AudioFormat;  
 import javax.sound.sampled.AudioInputStream;  
 import javax.sound.sampled.AudioSystem;  
 import javax.sound.sampled.DataLine;  

Java Sound Capture from Microphone working code

Sound  Capture / Record from Microphone and Save : working java source code example

 import java.io.ByteArrayInputStream;  
 import java.io.ByteArrayOutputStream;  
 import java.io.IOException;  
 import javax.sound.sampled.AudioFormat;  
 import javax.sound.sampled.AudioInputStream;  
 import javax.sound.sampled.AudioSystem;  
 import javax.sound.sampled.DataLine;  
 import javax.sound.sampled.TargetDataLine;  
 /**  
  * Reads data from the input channel and writes to the output stream  
  */  
 public class MicrophoneRecorder implements Runnable {  
   // record microphone && generate stream/byte array  
   private AudioInputStream audioInputStream;