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improve qr scanning performance by cropping to indicated box

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Craig Raw 2021-11-07 13:04:20 +02:00
parent 1bb3833cbe
commit 90439501ad
1 changed files with 22 additions and 2 deletions
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24
src/main/java/com/sparrowwallet/sparrow/control/WebcamService.java
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@ -15,9 +15,12 @@ import javafx.concurrent.Task;
import javafx.embed.swing.SwingFXUtils; import javafx.embed.swing.SwingFXUtils;
import javafx.scene.image.Image; import javafx.scene.image.Image;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage; import java.awt.image.BufferedImage;
import java.util.Arrays; import java.util.Arrays;
import java.util.List; import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit; import java.util.concurrent.TimeUnit;
public class WebcamService extends ScheduledService<Image> { public class WebcamService extends ScheduledService<Image> {
@ -93,12 +96,13 @@ public class WebcamService extends ScheduledService<Image> {
if(bimg == null) { if(bimg == null) {
return null; return null;
} }
BufferedImage croppedImage = getCroppedImage(bimg);
Image image = SwingFXUtils.toFXImage(bimg, null); Image image = SwingFXUtils.toFXImage(bimg, null);
updateValue(image); updateValue(image);
if(System.currentTimeMillis() > (lastQrSampleTime + QR_SAMPLE_PERIOD_MILLIS)) { if(System.currentTimeMillis() > (lastQrSampleTime + QR_SAMPLE_PERIOD_MILLIS)) {
readQR(bimg); readQR(croppedImage);
lastQrSampleTime = System.currentTimeMillis(); lastQrSampleTime = System.currentTimeMillis();
} }
@ -130,13 +134,29 @@ public class WebcamService extends ScheduledService<Image> {
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source)); BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
try { try {
Result result = qrReader.decode(bitmap); Result result = qrReader.decode(bitmap, Map.of(DecodeHintType.TRY_HARDER, Boolean.TRUE));
resultProperty.set(result); resultProperty.set(result);
} catch(ReaderException e) { } catch(ReaderException e) {
// fall thru, it means there is no QR code in image // 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() { public Result getResult() {
return resultProperty.get(); return resultProperty.get();
} }