convert Face Point - Android android.hardware

Android examples for android.hardware:Camera State

  1. HOME
  2. Android
  3. android.hardware
  4. Camera State

Description

convert Face Point

Demo Code

import android.graphics.Matrix;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.RectF;
import android.hardware.Camera;
import android.hardware.Camera;
import java.util.LinkedList;
import java.util.List;

public class Main {

  /**/*from  w  w  w.j av  a2 s  . co m*/
   * Convert coordination of face point to screen rect that will be draw on
   * canvas<br>
   */
  public static List<Point> convertFacePoint(boolean frontCamera, float displayOrientation, float viewWidth,
      float viewHeight, Point... points) {
    Matrix matrix = createConvertMatrix(frontCamera, displayOrientation, viewWidth, viewHeight);
    float[] pts = new float[points.length * 2];
    for (int i = 0; i < points.length; ++i) {
      pts[i * 2] = points[i].x;
      pts[i * 2 + 1] = points[i].y;
    }
    matrix.mapPoints(pts);
    List<Point> result = new LinkedList<>();
    for (int j = 0; j < pts.length; j += 2) {
      result.add(new Point((int) pts[j], (int) pts[j + 1]));
    }
    return result;
  }

  /**
   * create a coordination convert matrix <br>
   * See also {@link android.hardware.Camera.Face#rect}
   */
  private static Matrix createConvertMatrix(boolean frontCamera, float displayOrientation, float viewWidth,
      float viewHeight) {
    Matrix matrix = new Matrix();
    // Need mirror for front camera.
    boolean mirror = frontCamera;
    matrix.setScale(mirror ? -1 : 1, 1);
    // This is the value for android.hardware.Camera.setDisplayOrientation.
    matrix.postRotate(displayOrientation);
    // Camera driver coordinates range from (-1000, -1000) to (1000, 1000).
    // UI coordinates range from (0, 0) to (width, height).
    matrix.postScale(viewWidth / 2000f, viewHeight / 2000f);
    matrix.postTranslate(viewWidth / 2f, viewHeight / 2f);
    return matrix;
  }

}

Related Tutorials