将RGB数据的byte []转换为图像

Question

I have a byte[] I captured from Kinect using OpenKinect and it's Java JNA wrapper. I'm wondering if there's any existing library I can use to convert the byte[] of RGB data into a image I can display/store?

Answer 1

Java's BufferedImage is a great candidate .

I would find out the color encoding scheme of your byte[] and transform it to an int[] acceptable for setting the RGB array of a BufferedImage with setRGB() ^javadoc . Then you can save the image to disk in a variety of formats, or render for display.

• Writing/Saving an Image ^oracle

Answer 2

You can convert the byte[] RGB data into an int[] where each int encodes an ARGB pixel (alpha, red, green, blue). Then use the following code to create a BufferedImage

int[] pixels = new int[width * height];
// do the conversion byte[] => int[]
BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
img.setRGB(0, 0, width, height, pixels, 0, width);

You can then use ImageIO to save the image:

File outputFile = new File("image.png");
ImageIO.write(img, "png", outputFile);

Or draw the image for example in a JComponent's paint method:

public void paint(Graphics graphics){
  Graphics2D g = (Graphics2D)graphics;
  g.drawImage(img, 0, 0, img.getWidth(), img.getHeight(), null);
}

Consult the related JavaDoc for details. BufferedImage.TYPE_INT_ARGB is usually the fastest image encoding (at least it was a while ago on Mac OS X and Windows) even if you don't use any alpha at all.

Disclaimer: Code examples have not been tested.