Hi,
As part of the Kaggle Challenge, I have had to visualize training data which is a bunch of numbers with pixel intensity. To convert this into a picture file like jpeg or bmp I needed convertors. I found some JAVA code online but it didn’t solve my problem. I needed to tweak it a bit to make it work for my example.
The input to the program is a pixel map like this;
To convert this into a picture, you can use the below code;
note: My pixel map is of 2304 pixel intensities which translates to 48*48 Pixel image. Hence, the code below works with this. For other dimensions update the pic accordingly;
import java.awt.image.BufferedImage;
import java.awt.image.WritableRaster;
import java.io.File;
import javax.imageio.ImageIO;
public class pixtoImage {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
File imageFile = new File("D:/Pics/0-6.png");
//3 bands in TYPE_INT_RGB
int NUM_BANDS = 3;
int[] pixelMap = new int[48 * 48 * NUM_BANDS];
int band;
for (int i = 0; i < 48; i++)
{
for (int j = 0; j < 48; j++) {
for (band = 0; band < NUM_BANDS; band++){
pixelMap[((i * 48) + j)*NUM_BANDS + band] = Integer.parseInt(args[((i * 48) + j)]);
}
}
}
BufferedImage picImage = getImageFromArray(pixelMap, 48, 48);
try{
ImageIO.write(picImage, "png", imageFile);
}
catch(Exception e){
e.printStackTrace();
};
System.out.println("Written");
}
public static BufferedImage getImageFromArray(int[] pixels, int width, int height)
{
BufferedImage image =
new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
WritableRaster raster = (WritableRaster) image.getData();
raster.setPixels(0, 0, width, height, pixels);
image.setData(raster);
return image;
}
}
Output for the pixel map shown in the image above is
May this snippet save you some time, Have fun…..
BIdesi 