improve qr scanning performance by cropping to indicated box
@@ -15,9 +15,12 @@ import javafx.concurrent.Task;
import javafx.embed.swing.SwingFXUtils;
import javafx.scene.image.Image;
+import java.awt.*;
+import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.util.Arrays;
import java.util.List;
+import java.util.Map;
import java.util.concurrent.TimeUnit;
public class WebcamService extends ScheduledService<Image> {
@@ -93,12 +96,13 @@ public class WebcamService extends ScheduledService<Image> {
if(bimg == null) {
return null;
}
+ BufferedImage croppedImage = getCroppedImage(bimg);
Image image = SwingFXUtils.toFXImage(bimg, null);
updateValue(image);
if(System.currentTimeMillis() > (lastQrSampleTime + QR_SAMPLE_PERIOD_MILLIS)) {
- readQR(bimg);
+ readQR(croppedImage);
lastQrSampleTime = System.currentTimeMillis();
}
@@ -130,13 +134,29 @@ public class WebcamService extends ScheduledService<Image> {
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
try {
- Result result = qrReader.decode(bitmap);
+ Result result = qrReader.decode(bitmap, Map.of(DecodeHintType.TRY_HARDER, Boolean.TRUE));
resultProperty.set(result);
} catch(ReaderException e) {
// fall thru, it means there is no QR code in image
}
}
+ private BufferedImage getCroppedImage(BufferedImage bufferedImage) {
+ int dimension = Math.min(bufferedImage.getWidth(), bufferedImage.getHeight());
+ int squareSize = dimension / 2;
+ int x = (bufferedImage.getWidth() - squareSize) / 2;
+ int y = (bufferedImage.getHeight() - squareSize) / 2;
+
+ Graphics2D g2d = (Graphics2D)bufferedImage.getGraphics();
+ float[] dash1 = {10.0f};
+ g2d.setColor(Color.BLACK);
+ g2d.setStroke(new BasicStroke(3.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10.0f, dash1, 0.0f));
+ g2d.draw(new RoundRectangle2D.Double(x, y, squareSize, squareSize, 10, 10));
+ g2d.dispose();
+
+ return bufferedImage.getSubimage(x, y, squareSize, squareSize);
+ }
+
public Result getResult() {
return resultProperty.get();
}
