I'm using JavaCV for a university project. It is essentially a motion detector.
I use the OpenCVFrameGrabber class to get the frames from a webcam and I want to display the grabbed frames on my GUI.
I'm using SWT and I thought it would be good to display the frames into a Canvas component. I have a problem because the OpenCVFrameGrabber provides images as instances of the IplImage class and SWT uses org.eclipse.swt.graphics.Image image class.
So I should convert the image someway from IplImage to SWT Image. What is the best way to do this?
I recently converted BufferedImages (AWT) to SWT Image Objects. I made use of the following snippet: java2s.com
Maybe the code gets you started. Or someone already converted IplImages to BufferedImages, and you could "pipe" these two conversion methods.
/*
* example snippet: convert between SWT Image and AWT BufferedImage
*
* For a list of all SWT example snippets see
* http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
*/
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.DirectColorModel;
import java.awt.image.IndexColorModel;
import java.awt.image.WritableRaster;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
public class Snippet156 {
static BufferedImage convertToAWT(ImageData data) {
ColorModel colorModel = null;
PaletteData palette = data.palette;
if (palette.isDirect) {
colorModel = new DirectColorModel(data.depth, palette.redMask,
palette.greenMask, palette.blueMask);
BufferedImage bufferedImage = new BufferedImage(colorModel,
colorModel.createCompatibleWritableRaster(data.width,
data.height), false, null);
WritableRaster raster = bufferedImage.getRaster();
int[] pixelArray = new int[3];
for (int y = 0; y < data.height; y++) {
for (int x = 0; x < data.width; x++) {
int pixel = data.getPixel(x, y);
RGB rgb = palette.getRGB(pixel);
pixelArray[0] = rgb.red;
pixelArray[1] = rgb.green;
pixelArray[2] = rgb.blue;
raster.setPixels(x, y, 1, 1, pixelArray);
}
}
return bufferedImage;
} else {
RGB[] rgbs = palette.getRGBs();
byte[] red = new byte[rgbs.length];
byte[] green = new byte[rgbs.length];
byte[] blue = new byte[rgbs.length];
for (int i = 0; i < rgbs.length; i++) {
RGB rgb = rgbs[i];
red[i] = (byte) rgb.red;
green[i] = (byte) rgb.green;
blue[i] = (byte) rgb.blue;
}
if (data.transparentPixel != -1) {
colorModel = new IndexColorModel(data.depth, rgbs.length, red,
green, blue, data.transparentPixel);
} else {
colorModel = new IndexColorModel(data.depth, rgbs.length, red,
green, blue);
}
BufferedImage bufferedImage = new BufferedImage(colorModel,
colorModel.createCompatibleWritableRaster(data.width,
data.height), false, null);
WritableRaster raster = bufferedImage.getRaster();
int[] pixelArray = new int[1];
for (int y = 0; y < data.height; y++) {
for (int x = 0; x < data.width; x++) {
int pixel = data.getPixel(x, y);
pixelArray[0] = pixel;
raster.setPixel(x, y, pixelArray);
}
}
return bufferedImage;
}
}
static ImageData convertToSWT(BufferedImage bufferedImage) {
if (bufferedImage.getColorModel() instanceof DirectColorModel) {
DirectColorModel colorModel = (DirectColorModel) bufferedImage
.getColorModel();
PaletteData palette = new PaletteData(colorModel.getRedMask(),
colorModel.getGreenMask(), colorModel.getBlueMask());
ImageData data = new ImageData(bufferedImage.getWidth(),
bufferedImage.getHeight(), colorModel.getPixelSize(),
palette);
WritableRaster raster = bufferedImage.getRaster();
int[] pixelArray = new int[3];
for (int y = 0; y < data.height; y++) {
for (int x = 0; x < data.width; x++) {
raster.getPixel(x, y, pixelArray);
int pixel = palette.getPixel(new RGB(pixelArray[0],
pixelArray[1], pixelArray[2]));
data.setPixel(x, y, pixel);
}
}
return data;
} else if (bufferedImage.getColorModel() instanceof IndexColorModel) {
IndexColorModel colorModel = (IndexColorModel) bufferedImage
.getColorModel();
int size = colorModel.getMapSize();
byte[] reds = new byte[size];
byte[] greens = new byte[size];
byte[] blues = new byte[size];
colorModel.getReds(reds);
colorModel.getGreens(greens);
colorModel.getBlues(blues);
RGB[] rgbs = new RGB[size];
for (int i = 0; i < rgbs.length; i++) {
rgbs[i] = new RGB(reds[i] & 0xFF, greens[i] & 0xFF,
blues[i] & 0xFF);
}
PaletteData palette = new PaletteData(rgbs);
ImageData data = new ImageData(bufferedImage.getWidth(),
bufferedImage.getHeight(), colorModel.getPixelSize(),
palette);
data.transparentPixel = colorModel.getTransparentPixel();
WritableRaster raster = bufferedImage.getRaster();
int[] pixelArray = new int[1];
for (int y = 0; y < data.height; y++) {
for (int x = 0; x < data.width; x++) {
raster.getPixel(x, y, pixelArray);
data.setPixel(x, y, pixelArray[0]);
}
}
return data;
}
return null;
}
static ImageData createSampleImage(Display display) {
Image image = new Image(display, 100, 100);
Rectangle bounds = image.getBounds();
GC gc = new GC(image);
gc.setBackground(display.getSystemColor(SWT.COLOR_BLUE));
gc.fillRectangle(bounds);
gc.setBackground(display.getSystemColor(SWT.COLOR_GREEN));
gc.fillOval(0, 0, bounds.width, bounds.height);
gc.setForeground(display.getSystemColor(SWT.COLOR_RED));
gc.drawLine(0, 0, bounds.width, bounds.height);
gc.drawLine(bounds.width, 0, 0, bounds.height);
gc.dispose();
ImageData data = image.getImageData();
image.dispose();
return data;
}
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("SWT Image");
ImageData data;
if (args.length > 0) {
String fileName = args[0];
data = new ImageData(fileName);
} else {
data = createSampleImage(display);
}
final Image swtImage = new Image(display, data);
final BufferedImage awtImage = convertToAWT(data);
final Image swtImage2 = new Image(display, convertToSWT(awtImage));
shell.addListener(SWT.Paint, new Listener() {
public void handleEvent(Event e) {
int y = 10;
if (swtImage != null) {
e.gc.drawImage(swtImage, 10, y);
y += swtImage.getBounds().height + 10;
}
if (swtImage2 != null) {
e.gc.drawImage(swtImage2, 10, y);
}
}
});
Frame frame = new Frame() {
public void paint(Graphics g) {
Insets insets = getInsets();
if (awtImage != null) {
g.drawImage(awtImage, 10 + insets.left, 10 + insets.top,
null);
}
}
};
frame.setTitle("AWT Image");
shell.setLocation(50, 50);
Rectangle bounds = swtImage.getBounds();
shell.setSize(bounds.width + 50, bounds.height * 2 + 100);
Point size = shell.getSize();
Point location = shell.getLocation();
Insets insets = frame.getInsets();
frame.setLocation(location.x + size.x + 10, location.y);
frame.setSize(size.x - (insets.left + insets.right), size.y
- (insets.top + insets.bottom));
frame.setVisible(true);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
if (swtImage != null)
swtImage.dispose();
if (swtImage2 != null)
swtImage.dispose();
frame.dispose();
System.exit(0);
}
}