Compressing Images

adrock42

I am looking for a good way to compress images, fast(er) I have this, but it needs to be faster as I am streaming video over a network

byte[] compressImg(PImage img,int w, int h, float quality){
    byte[] output;
    BufferedImage bimg = new BufferedImage(w,h, BufferedImage.TYPE_INT_RGB );
    bimg.setRGB( 0, 0, w,h, img.pixels, 0, img.width);
    Iterator iterator=ImageIO.getImageWritersByFormatName("jpg");
    ImageWriter writer=(ImageWriter)iterator.next();
    ImageWriteParam p=writer.getDefaultWriteParam();
    p.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    p.setCompressionQuality(quality);
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    ImageOutputStream ios=null;
    try{
      ios = ImageIO.createImageOutputStream(bos);
      writer.setOutput(ios);
      writer.write(null,new IIOImage(bimg,null,null),p);
      ios.flush();
      bimg.flush();
      writer.dispose();
      ios.close();
    }catch(Exception e){
      println(e+"@ios");
    }
    //println(bos.toByteArray().length);
    output = new byte[bos.toByteArray().length];
    output = bos.toByteArray();
    return output;  
}

btw i want to output it to a byte array in the end, but any help on the image compression part would be awesome

adrock42

or maybe just some help on optimization of the above

adrock42

is this just way past what I should be doing with processing?

PhiLho

Image compression, if you need it to be efficient, is quite complex and time-consuming. There are simpler algorithms, like RLE, but they are efficient only with simple images (B&W, flat colors, etc.).

adrock42

I think I am going to end up streaming the video. hopefully the above code helps someone. From what I have gathered, gstreamer is the most used solution. So I will dig into that