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# Mendeteksi Teks Dokumen dengan Amazon Textract
Untuk mendeteksi teks dalam dokumen, Anda menggunakan[DetectDocumentText](API_DetectDocumentText.md)operasi, dan lulus file dokumen sebagai masukan.`DetectDocumentText`mengembalikan struktur JSON yang berisi garis dan kata-kata teks yang terdeteksi, lokasi teks dalam dokumen, dan hubungan antara teks yang terdeteksi. Untuk informasi selengkapnya, lihat [Mendeteksi teks](how-it-works-detecting.md).
Anda dapat menyediakan dokumen input sebagai array bit citra (bit citra yang dikodekan base64), atau sebagai objek Amazon S3. Dalam prosedur ini, Anda mengunggah file citra ke bucket S3 Anda dan menentukan nama file.
**Untuk mendeteksi teks dalam dokumen (API)**
1. Jika belum:
1. Buat atau perbarui pengguna IAM dengan izin `AmazonTextractFullAccess` dan `AmazonS3ReadOnlyAccess`. Untuk informasi selengkapnya, lihat [Langkah 1: Siapkan Akun AWS dan Buat Pengguna IAM](setting-up.md#setting-up-iam).
1. Instal dan konfigurasikan SDK AWS CLI dan AWS. Untuk informasi selengkapnya, lihat [Langkah 2: MenyiapkanAWS CLIdanAWSSDK](setup-awscli-sdk.md).
1. Unggah dokumen ke bucket S3.
Untuk instruksi, lihat[Mengunggah Objek ke Amazon S3](https://docs.aws.amazon.com/AmazonS3/latest/user-guide/UploadingObjectsintoAmazonS3.html)di*Panduan Pengguna Amazon Simple Storage Service*.
1. Gunakan contoh berikut untuk memanggil operasi `DetectDocumentText`.
------
#### [ Java ]
Kode contoh berikut menampilkan dokumen dan kotak di sekitar baris teks terdeteksi.
Fungsi`main`, ganti nilai`bucket`dan`document`dengan nama bucket Amazon S3 dan dokumen yang Anda gunakan pada langkah 2.
```
//Calls DetectDocumentText.
//Loads document from S3 bucket. Displays the document and bounding boxes around detected lines/words of text.
package com.amazonaws.samples;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.List;
import javax.imageio.ImageIO;
import javax.swing.*;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.S3ObjectInputStream;
import com.amazonaws.client.builder.AwsClientBuilder.EndpointConfiguration;
import com.amazonaws.services.textract.AmazonTextract;
import com.amazonaws.services.textract.AmazonTextractClientBuilder;
import com.amazonaws.services.textract.model.Block;
import com.amazonaws.services.textract.model.BoundingBox;
import com.amazonaws.services.textract.model.DetectDocumentTextRequest;
import com.amazonaws.services.textract.model.DetectDocumentTextResult;
import com.amazonaws.services.textract.model.Document;
import com.amazonaws.services.textract.model.S3Object;
import com.amazonaws.services.textract.model.Point;
import com.amazonaws.services.textract.model.Relationship;
public class DocumentText extends JPanel {
private static final long serialVersionUID = 1L;
BufferedImage image;
DetectDocumentTextResult result;
public DocumentText(DetectDocumentTextResult documentResult, BufferedImage bufImage) throws Exception {
super();
result = documentResult; // Results of text detection.
image = bufImage; // The image containing the document.
}
// Draws the image and text bounding box.
public void paintComponent(Graphics g) {
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, image.getWidth(this) , image.getHeight(this), this);
// Iterate through blocks and display polygons around lines of detected text.
List blocks = result.getBlocks();
for (Block block : blocks) {
DisplayBlockInfo(block);
if ((block.getBlockType()).equals("LINE")) {
ShowPolygon(height, width, block.getGeometry().getPolygon(), g2d);
/*
ShowBoundingBox(height, width, block.getGeometry().getBoundingBox(), g2d);
*/
} else { // its a word, so just show vertical lines.
ShowPolygonVerticals(height, width, block.getGeometry().getPolygon(), g2d);
}
}
}
// Show bounding box at supplied location.
private void ShowBoundingBox(int imageHeight, int imageWidth, BoundingBox box, Graphics2D g2d) {
float left = imageWidth * box.getLeft();
float top = imageHeight * box.getTop();
// Display bounding box.
g2d.setColor(new Color(0, 212, 0));
g2d.drawRect(Math.round(left), Math.round(top),
Math.round(imageWidth * box.getWidth()), Math.round(imageHeight * box.getHeight()));
}
// Shows polygon at supplied location
private void ShowPolygon(int imageHeight, int imageWidth, List points, Graphics2D g2d) {
g2d.setColor(new Color(0, 0, 0));
Polygon polygon = new Polygon();
// Construct polygon and display
for (Point point : points) {
polygon.addPoint((Math.round(point.getX() * imageWidth)),
Math.round(point.getY() * imageHeight));
}
g2d.drawPolygon(polygon);
}
// Draws only the vertical lines in the supplied polygon.
private void ShowPolygonVerticals(int imageHeight, int imageWidth, List points, Graphics2D g2d) {
g2d.setColor(new Color(0, 212, 0));
Object[] parry = points.toArray();
g2d.setStroke(new BasicStroke(2));
g2d.drawLine(Math.round(((Point) parry[0]).getX() * imageWidth),
Math.round(((Point) parry[0]).getY() * imageHeight), Math.round(((Point) parry[3]).getX() * imageWidth),
Math.round(((Point) parry[3]).getY() * imageHeight));
g2d.setColor(new Color(255, 0, 0));
g2d.drawLine(Math.round(((Point) parry[1]).getX() * imageWidth),
Math.round(((Point) parry[1]).getY() * imageHeight), Math.round(((Point) parry[2]).getX() * imageWidth),
Math.round(((Point) parry[2]).getY() * imageHeight));
}
//Displays information from a block returned by text detection and text analysis
private void DisplayBlockInfo(Block block) {
System.out.println("Block Id : " + block.getId());
if (block.getText()!=null)
System.out.println(" Detected text: " + block.getText());
System.out.println(" Type: " + block.getBlockType());
if (block.getBlockType().equals("PAGE") !=true) {
System.out.println(" Confidence: " + block.getConfidence().toString());
}
if(block.getBlockType().equals("CELL"))
{
System.out.println(" Cell information:");
System.out.println(" Column: " + block.getColumnIndex());
System.out.println(" Row: " + block.getRowIndex());
System.out.println(" Column span: " + block.getColumnSpan());
System.out.println(" Row span: " + block.getRowSpan());
}
System.out.println(" Relationships");
List relationships=block.getRelationships();
if(relationships!=null) {
for (Relationship relationship : relationships) {
System.out.println(" Type: " + relationship.getType());
System.out.println(" IDs: " + relationship.getIds().toString());
}
} else {
System.out.println(" No related Blocks");
}
System.out.println(" Geometry");
System.out.println(" Bounding Box: " + block.getGeometry().getBoundingBox().toString());
System.out.println(" Polygon: " + block.getGeometry().getPolygon().toString());
List entityTypes = block.getEntityTypes();
System.out.println(" Entity Types");
if(entityTypes!=null) {
for (String entityType : entityTypes) {
System.out.println(" Entity Type: " + entityType);
}
} else {
System.out.println(" No entity type");
}
if(block.getPage()!=null)
System.out.println(" Page: " + block.getPage());
System.out.println();
}
public static void main(String arg[]) throws Exception {
// The S3 bucket and document
String document = "";
String bucket = "";
AmazonS3 s3client = AmazonS3ClientBuilder.standard()
.withEndpointConfiguration(
new EndpointConfiguration("https://s3.amazonaws.com","us-east-1"))
.build();
// Get the document from S3
com.amazonaws.services.s3.model.S3Object s3object = s3client.getObject(bucket, document);
S3ObjectInputStream inputStream = s3object.getObjectContent();
BufferedImage image = ImageIO.read(inputStream);
// Call DetectDocumentText
EndpointConfiguration endpoint = new EndpointConfiguration(
"https://textract.us-east-1.amazonaws.com", "us-east-1");
AmazonTextract client = AmazonTextractClientBuilder.standard()
.withEndpointConfiguration(endpoint).build();
DetectDocumentTextRequest request = new DetectDocumentTextRequest()
.withDocument(new Document().withS3Object(new S3Object().withName(document).withBucket(bucket)));
DetectDocumentTextResult result = client.detectDocumentText(request);
// Create frame and panel.
JFrame frame = new JFrame("RotateImage");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
DocumentText panel = new DocumentText(result, image);
panel.setPreferredSize(new Dimension(image.getWidth() , image.getHeight() ));
frame.setContentPane(panel);
frame.pack();
frame.setVisible(true);
}
}
```
------
#### [ AWS CLI ]
Perintah AWS CLI ini menampilkan output JSON untuk operasi CLI `detect-document-text`.
Ganti nilai`Bucket`dan`Name`dengan nama bucket Amazon S3 dan dokumen yang Anda gunakan pada langkah 2.
```
aws textract detect-document-text \
--document '{"S3Object":{"Bucket":"bucket","Name":"document"}}'
```
------
#### [ Python ]
Kode contoh berikut menampilkan dokumen dan kotak di sekitar baris terdeteksi teks.
Fungsi`main`, ganti nilai`bucket`dan`document`dengan nama bucket Amazon S3 dan dokumen yang Anda gunakan pada langkah 2.
```
#Detects text in a document stored in an S3 bucket. Display polygon box around text and angled text
import boto3
import io
from io import BytesIO
import sys
import psutil
import time
import math
from PIL import Image, ImageDraw, ImageFont
# Displays information about a block returned by text detection and text analysis
def DisplayBlockInformation(block):
print('Id: {}'.format(block['Id']))
if 'Text' in block:
print(' Detected: ' + block['Text'])
print(' Type: ' + block['BlockType'])
if 'Confidence' in block:
print(' Confidence: ' + "{:.2f}".format(block['Confidence']) + "%")
if block['BlockType'] == 'CELL':
print(" Cell information")
print(" Column: " + str(block['ColumnIndex']))
print(" Row: " + str(block['RowIndex']))
print(" ColumnSpan: " + str(block['ColumnSpan']))
print(" RowSpan: " + str(block['RowSpan']))
if 'Relationships' in block:
print(' Relationships: {}'.format(block['Relationships']))
print(' Geometry: ')
print(' Bounding Box: {}'.format(block['Geometry']['BoundingBox']))
print(' Polygon: {}'.format(block['Geometry']['Polygon']))
if block['BlockType'] == "KEY_VALUE_SET":
print (' Entity Type: ' + block['EntityTypes'][0])
if 'Page' in block:
print('Page: ' + block['Page'])
print()
def process_text_detection(bucket, document):
#Get the document from S3
s3_connection = boto3.resource('s3')
s3_object = s3_connection.Object(bucket,document)
s3_response = s3_object.get()
stream = io.BytesIO(s3_response['Body'].read())
image=Image.open(stream)
# Detect text in the document
client = boto3.client('textract')
#process using image bytes
#image_binary = stream.getvalue()
#response = client.detect_document_text(Document={'Bytes': image_binary})
#process using S3 object
response = client.detect_document_text(
Document={'S3Object': {'Bucket': bucket, 'Name': document}})
#Get the text blocks
blocks=response['Blocks']
width, height =image.size
draw = ImageDraw.Draw(image)
print ('Detected Document Text')
# Create image showing bounding box/polygon the detected lines/text
for block in blocks:
print('Type: ' + block['BlockType'])
if block['BlockType'] != 'PAGE':
print('Detected: ' + block['Text'])
print('Confidence: ' + "{:.2f}".format(block['Confidence']) + "%")
print('Id: {}'.format(block['Id']))
if 'Relationships' in block:
print('Relationships: {}'.format(block['Relationships']))
print('Bounding Box: {}'.format(block['Geometry']['BoundingBox']))
print('Polygon: {}'.format(block['Geometry']['Polygon']))
print()
draw=ImageDraw.Draw(image)
# Draw WORD - Green - start of word, red - end of word
if block['BlockType'] == "WORD":
draw.line([(width * block['Geometry']['Polygon'][0]['X'],
height * block['Geometry']['Polygon'][0]['Y']),
(width * block['Geometry']['Polygon'][3]['X'],
height * block['Geometry']['Polygon'][3]['Y'])],fill='green',
width=2)
draw.line([(width * block['Geometry']['Polygon'][1]['X'],
height * block['Geometry']['Polygon'][1]['Y']),
(width * block['Geometry']['Polygon'][2]['X'],
height * block['Geometry']['Polygon'][2]['Y'])],
fill='red',
width=2)
# Draw box around entire LINE
if block['BlockType'] == "LINE":
points=[]
for polygon in block['Geometry']['Polygon']:
points.append((width * polygon['X'], height * polygon['Y']))
draw.polygon((points), outline='black')
# Uncomment to draw bounding box
#box=block['Geometry']['BoundingBox']
#left = width * box['Left']
#top = height * box['Top']
#draw.rectangle([left,top, left + (width * box['Width']), top +(height * box['Height'])],outline='black')
# Display the image
image.show()
# display image for 10 seconds
return len(blocks)
def main():
bucket = ''
document = ''
block_count=process_text_detection(bucket,document)
print("Blocks detected: " + str(block_count))
if __name__ == "__main__":
main()
```
------
#### [ Node.js ]
Berikut Node.js contoh kode menampilkan dokumen dan kotak di sekitar baris terdeteksi teks, output gambar hasil ke direktori Anda menjalankan kode dari. Itu membuat penggunaan`image-size`dan`images`paket.
Fungsi`main`, ganti nilai`bucket`dan`document`dengan nama bucket Amazon S3 dan dokumen yang Anda gunakan pada langkah 2. Ganti nilai`regionConfig`dengan nama wilayah akun Anda berada.
```
async function main(){
// Import AWS
const AWS = require("aws-sdk")
// Use Image-Size to get
const sizeOf = require('image-size');
// Image tool to draw buffers
const images = require("images");
// Create a canvas and get the context
const { createCanvas } = require('canvas')
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d')
// Set variables
const bucket = 'bucket-name' // the s3 bucket name
const photo = 'image-name' // the name of file
const regionConfig = 'region'
// Set region if needed
AWS.config.update({region:regionConfig});
// Connect to Textract
const client = new AWS.Textract();
// Connect to S3 to display image
const s3 = new AWS.S3();
// Define paramaters
const params = {
Document: {
S3Object: {
Bucket: bucket,
Name: photo
},
},
}
// Function to display image
async function getImage(){
const imageData = s3.getObject(
{
Bucket: bucket,
Key: photo
}
).promise();
return imageData;
}
// get image
var imageData = await getImage()
// Get the height, width of the image
const dimensions = sizeOf(imageData.Body)
const width = dimensions.width
const height = dimensions.height
console.log(imageData.Body)
console.log(width, height)
canvas.width = width;
canvas.height = height;
try{
// Call API and log response
const res = await client.detectDocumentText(params).promise();
var image = images(imageData.Body).size(width, height)
//console.log the type of block, text, text type, and confidence
res.Blocks.forEach(block => {
console.log(`Block Type: ${block.BlockType}`),
console.log(`Text: ${block.Text}`)
console.log(`TextType: ${block.TextType}`)
console.log(`Confidence: ${block.Confidence}`)
// Draw box around detected text using polygons
ctx.strokeStyle = 'rgba(0,0,0,0.5)';
ctx.beginPath();
block.Geometry.Polygon.forEach(({X, Y}) =>
ctx.lineTo(width * X - 10, height * Y - 10)
);
ctx.closePath();
ctx.stroke();
console.log("-----")
})
// render image
var buffer = canvas.toBuffer("image/png");
image.draw(images(buffer), 10, 10)
image.save("output-image.jpg");
} catch (err){
console.error(err);}
}
main()
```
------
1. Jalankan contoh. Contoh Python dan Java menampilkan gambar dokumen. Kotak hitam mengelilingi setiap baris teks yang terdeteksi. Garis vertikal hijau adalah awal dari kata yang terdeteksi. Garis vertikal merah adalah akhir dari kata yang terdeteksi. ParameterAWS CLIcontoh hanya menampilkan output JSON untuk`DetectDocumentText`operasi.