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rekognition-image-java-display-bounding-boxes.java

rekognition-image-java-display-bounding-boxes.java demonstrates how to detect display bounding boxes around faces detected in an image loaded from an S3 Bucket.

/** * Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved. * * This file is licensed under the Apache License, Version 2.0 (the "License"). * You may not use this file except in compliance with the License. A copy of * the License is located at * * http://aws.amazon.com/apache2.0/ * * This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR * CONDITIONS OF ANY KIND, either express or implied. See the License for the * specific language governing permissions and limitations under the License. */ //Loads images, detects faces and draws bounding boxes.Determines exif orientation, if necessary. package aws.example.rekognition.image; //Import the basic graphics classes. import java.awt.*; import java.awt.image.BufferedImage; import java.util.List; import javax.imageio.ImageIO; import javax.swing.*; import com.amazonaws.services.rekognition.AmazonRekognition; import com.amazonaws.services.rekognition.AmazonRekognitionClientBuilder; import com.amazonaws.services.rekognition.model.BoundingBox; import com.amazonaws.services.rekognition.model.DetectFacesRequest; import com.amazonaws.services.rekognition.model.DetectFacesResult; import com.amazonaws.services.rekognition.model.FaceDetail; import com.amazonaws.services.rekognition.model.Image; import com.amazonaws.services.rekognition.model.S3Object; import com.amazonaws.services.s3.AmazonS3; import com.amazonaws.services.s3.AmazonS3ClientBuilder; import com.amazonaws.services.s3.model.S3ObjectInputStream; // Calls DetectFaces and displays a bounding box around each detected image. public class DisplayFaces extends JPanel { private static final long serialVersionUID = 1L; BufferedImage image; static int scale; DetectFacesResult result; public DisplayFaces(DetectFacesResult facesResult, BufferedImage bufImage) throws Exception { super(); scale = 1; // increase to shrink image size. result = facesResult; image = bufImage; } // Draws the bounding box around the detected faces. public void paintComponent(Graphics g) { float left = 0; float top = 0; int height = image.getHeight(this); int width = image.getWidth(this); Graphics2D g2d = (Graphics2D) g; // Create a Java2D version of g. // Draw the image. g2d.drawImage(image, 0, 0, width / scale, height / scale, this); g2d.setColor(new Color(0, 212, 0)); // Iterate through faces and display bounding boxes. List<FaceDetail> faceDetails = result.getFaceDetails(); for (FaceDetail face : faceDetails) { BoundingBox box = face.getBoundingBox(); left = width * box.getLeft(); top = height * box.getTop(); g2d.drawRect(Math.round(left / scale), Math.round(top / scale), Math.round((width * box.getWidth()) / scale), Math.round((height * box.getHeight())) / scale); } } public static void main(String arg[]) throws Exception { //Change the value of bucket to the S3 bucket that contains your image file. //Change the value of photo to your image file name. String photo = "input.png"; String bucket = "bucket"; int height = 0; int width = 0; // Get the image from an S3 Bucket AmazonS3 s3client = AmazonS3ClientBuilder.defaultClient(); com.amazonaws.services.s3.model.S3Object s3object = s3client.getObject(bucket, photo); S3ObjectInputStream inputStream = s3object.getObjectContent(); BufferedImage image = ImageIO.read(inputStream); DetectFacesRequest request = new DetectFacesRequest() .withImage(new Image().withS3Object(new S3Object().withName(photo).withBucket(bucket))); width = image.getWidth(); height = image.getHeight(); // Call DetectFaces AmazonRekognition amazonRekognition = AmazonRekognitionClientBuilder.defaultClient(); DetectFacesResult result = amazonRekognition.detectFaces(request); //Show the bounding box info for each face. List<FaceDetail> faceDetails = result.getFaceDetails(); for (FaceDetail face : faceDetails) { BoundingBox box = face.getBoundingBox(); float left = width * box.getLeft(); float top = height * box.getTop(); System.out.println("Face:"); System.out.println("Left: " + String.valueOf((int) left)); System.out.println("Top: " + String.valueOf((int) top)); System.out.println("Face Width: " + String.valueOf((int) (width * box.getWidth()))); System.out.println("Face Height: " + String.valueOf((int) (height * box.getHeight()))); System.out.println(); } // Create frame and panel. JFrame frame = new JFrame("RotateImage"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); DisplayFaces panel = new DisplayFaces(result, image); panel.setPreferredSize(new Dimension(image.getWidth() / scale, image.getHeight() / scale)); frame.setContentPane(panel); frame.pack(); frame.setVisible(true); } }

Sample Details

Service: rekognition

Last tested: 2019-01-18

Author: reesch(AWS)

Type: full-example

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