구글 Cloud Vision API 사용 (Java)

텍스트 인식

환경변수 GOOGLE_APPLICATION_CREDENTIALS에 인증용 json파일 경로설정

import com.google.cloud.vision.v1.AnnotateImageRequest;
import com.google.cloud.vision.v1.AnnotateImageResponse;
import com.google.cloud.vision.v1.BatchAnnotateImagesResponse;
import com.google.cloud.vision.v1.EntityAnnotation;
import com.google.cloud.vision.v1.Feature;
import com.google.cloud.vision.v1.Image;
import com.google.cloud.vision.v1.ImageAnnotatorClient;
import com.google.protobuf.ByteString;

import javax.swing.*;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class test {

    public static void detectText() throws IOException {
        // TODO(developer): Replace these variables before running the sample.
        String filePath = "captcha.png";
        detectText(filePath);
    }

    // Detects text in the specified image.
    public static void detectText(String filePath) throws IOException {
        List<AnnotateImageRequest> requests = new ArrayList<>();

        ByteString imgBytes = ByteString.readFrom(new FileInputStream(filePath));

        Image img = Image.newBuilder().setContent(imgBytes).build();
        Feature feat = Feature.newBuilder().setType(Feature.Type.TEXT_DETECTION).build();
        AnnotateImageRequest request =
                AnnotateImageRequest.newBuilder().addFeatures(feat).setImage(img).build();
        requests.add(request);

        // Initialize client that will be used to send requests. This client only needs to be created
        // once, and can be reused for multiple requests. After completing all of your requests, call
        // the "close" method on the client to safely clean up any remaining background resources.
        try (ImageAnnotatorClient client = ImageAnnotatorClient.create()) {
            BatchAnnotateImagesResponse response = client.batchAnnotateImages(requests);
            List<AnnotateImageResponse> responses = response.getResponsesList();

            for (AnnotateImageResponse res : responses) {
                if (res.hasError()) {
                    System.out.format("Error: %s%n", res.getError().getMessage());
                    return;
                }

                // For full list of available annotations, see http://g.co/cloud/vision/docs
                for (EntityAnnotation annotation : res.getTextAnnotationsList()) {
                    System.out.format("Text: %s%n", annotation.getDescription());
                    System.out.format("Position : %s%n", annotation.getBoundingPoly());
                }
            }
        } catch (IOException ioException) {
            ioException.printStackTrace();
            JOptionPane.showMessageDialog(null,"인증 관련 문제 발생시\n" +
                    "1. 인증 json파일을 환경변수에 설정\n" +
                    "2. 관리자 권한으로 실행");
        }
    }

    public static void main(String[] args) throws Exception{
        detectText();
    }
}

인증 방법 : 링크