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深入探索

如需包含這個程式碼範例的詳細說明文件，請參閱下列文章：

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• 偵測本機檔案中的文字

程式碼範例

Go

如要瞭解如何安裝及使用 Vision API Product Search 的用戶端程式庫，請參閱 Vision API Product Search 用戶端程式庫。 詳情請參閱 Vision API Product Search Go API 參考文件。

如要向 Vision API Product Search 進行驗證，請設定應用程式預設憑證。詳情請參閱「為本機開發環境設定驗證機制」。

// detectDocumentText gets the full document text from the Vision API for an image at the given file path.
func detectDocumentText(w io.Writer, file string) error {
	ctx := context.Background()

	client, err := vision.NewImageAnnotatorClient(ctx)
	if err != nil {
		return err
	}

	f, err := os.Open(file)
	if err != nil {
		return err
	}
	defer f.Close()

	image, err := vision.NewImageFromReader(f)
	if err != nil {
		return err
	}
	annotation, err := client.DetectDocumentText(ctx, image, nil)
	if err != nil {
		return err
	}

	if annotation == nil {
		fmt.Fprintln(w, "No text found.")
	} else {
		fmt.Fprintln(w, "Document Text:")
		fmt.Fprintf(w, "%q\n", annotation.Text)

		fmt.Fprintln(w, "Pages:")
		for _, page := range annotation.Pages {
			fmt.Fprintf(w, "\tConfidence: %f, Width: %d, Height: %d\n", page.Confidence, page.Width, page.Height)
			fmt.Fprintln(w, "\tBlocks:")
			for _, block := range page.Blocks {
				fmt.Fprintf(w, "\t\tConfidence: %f, Block type: %v\n", block.Confidence, block.BlockType)
				fmt.Fprintln(w, "\t\tParagraphs:")
				for _, paragraph := range block.Paragraphs {
					fmt.Fprintf(w, "\t\t\tConfidence: %f", paragraph.Confidence)
					fmt.Fprintln(w, "\t\t\tWords:")
					for _, word := range paragraph.Words {
						symbols := make([]string, len(word.Symbols))
						for i, s := range word.Symbols {
							symbols[i] = s.Text
						}
						wordText := strings.Join(symbols, "")
						fmt.Fprintf(w, "\t\t\t\tConfidence: %f, Symbols: %s\n", word.Confidence, wordText)
					}
				}
			}
		}
	}

	return nil
}

Java

如要瞭解如何安裝及使用 Vision API Product Search 的用戶端程式庫，請參閱 Vision API Product Search 用戶端程式庫。 詳情請參閱 Vision API Product Search Java API 參考文件。

如要向 Vision API Product Search 進行驗證，請設定應用程式預設憑證。詳情請參閱「為本機開發環境設定驗證機制」。

public static void detectDocumentText(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(Type.DOCUMENT_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();
    client.close();

    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
      TextAnnotation annotation = res.getFullTextAnnotation();
      for (Page page : annotation.getPagesList()) {
        String pageText = "";
        for (Block block : page.getBlocksList()) {
          String blockText = "";
          for (Paragraph para : block.getParagraphsList()) {
            String paraText = "";
            for (Word word : para.getWordsList()) {
              String wordText = "";
              for (Symbol symbol : word.getSymbolsList()) {
                wordText = wordText + symbol.getText();
                System.out.format(
                    "Symbol text: %s (confidence: %f)%n",
                    symbol.getText(), symbol.getConfidence());
              }
              System.out.format(
                  "Word text: %s (confidence: %f)%n%n", wordText, word.getConfidence());
              paraText = String.format("%s %s", paraText, wordText);
            }
            // Output Example using Paragraph:
            System.out.println("%nParagraph: %n" + paraText);
            System.out.format("Paragraph Confidence: %f%n", para.getConfidence());
            blockText = blockText + paraText;
          }
          pageText = pageText + blockText;
        }
      }
      System.out.println("%nComplete annotation:");
      System.out.println(annotation.getText());
    }
  }
}

Node.js

如要瞭解如何安裝及使用 Vision API Product Search 的用戶端程式庫，請參閱 Vision API Product Search 用戶端程式庫。 詳情請參閱 Vision API Product Search Node.js API 參考文件。

如要向 Vision API Product Search 進行驗證，請設定應用程式預設憑證。詳情請參閱「為本機開發環境設定驗證機制」。

// Imports the Google Cloud client library
const vision = require('@google-cloud/vision');

// Creates a client
const client = new vision.ImageAnnotatorClient();

/**
 * TODO(developer): Uncomment the following line before running the sample.
 */
// const fileName = 'Local image file, e.g. /path/to/image.png';

// Read a local image as a text document
const [result] = await client.documentTextDetection(fileName);
const fullTextAnnotation = result.fullTextAnnotation;
console.log(`Full text: ${fullTextAnnotation.text}`);
fullTextAnnotation.pages.forEach(page => {
  page.blocks.forEach(block => {
    console.log(`Block confidence: ${block.confidence}`);
    block.paragraphs.forEach(paragraph => {
      console.log(`Paragraph confidence: ${paragraph.confidence}`);
      paragraph.words.forEach(word => {
        const wordText = word.symbols.map(s => s.text).join('');
        console.log(`Word text: ${wordText}`);
        console.log(`Word confidence: ${word.confidence}`);
        word.symbols.forEach(symbol => {
          console.log(`Symbol text: ${symbol.text}`);
          console.log(`Symbol confidence: ${symbol.confidence}`);
        });
      });
    });
  });
});

PHP

如要瞭解如何安裝及使用 Vision API Product Search 的用戶端程式庫，請參閱 Vision API Product Search 用戶端程式庫。

如要向 Vision API Product Search 進行驗證，請設定應用程式預設憑證。詳情請參閱「為本機開發環境設定驗證機制」。

namespace Google\Cloud\Samples\Vision;

use Google\Cloud\Vision\V1\Client\ImageAnnotatorClient;

/**
 * @param string $path Path to the image, e.g. "path/to/your/image.jpg"
 */
function detect_document_text(string $path)
{
    $imageAnnotator = new ImageAnnotatorClient();

    # annotate the image
    $image = file_get_contents($path);
    $response = $imageAnnotator->documentTextDetection($image);
    $annotation = $response->getFullTextAnnotation();

    # print out detailed and structured information about document text
    if ($annotation) {
        foreach ($annotation->getPages() as $page) {
            foreach ($page->getBlocks() as $block) {
                $block_text = '';
                foreach ($block->getParagraphs() as $paragraph) {
                    foreach ($paragraph->getWords() as $word) {
                        foreach ($word->getSymbols() as $symbol) {
                            $block_text .= $symbol->getText();
                        }
                        $block_text .= ' ';
                    }
                    $block_text .= "\n";
                }
                printf('Block content: %s', $block_text);
                printf('Block confidence: %f' . PHP_EOL,
                    $block->getConfidence());

                # get bounds
                $vertices = $block->getBoundingBox()->getVertices();
                $bounds = [];
                foreach ($vertices as $vertex) {
                    $bounds[] = sprintf('(%d,%d)', $vertex->getX(),
                        $vertex->getY());
                }
                print('Bounds: ' . join(', ', $bounds) . PHP_EOL);
                print(PHP_EOL);
            }
        }
    } else {
        print('No text found' . PHP_EOL);
    }

    $imageAnnotator->close();
}

Python

如要瞭解如何安裝及使用 Vision API Product Search 的用戶端程式庫，請參閱 Vision API Product Search 用戶端程式庫。 詳情請參閱 Vision API Product Search Python API 參考文件。

如要向 Vision API Product Search 進行驗證，請設定應用程式預設憑證。詳情請參閱「為本機開發環境設定驗證機制」。

def detect_document(path):
    """Detects document features in an image."""
    from google.cloud import vision

    client = vision.ImageAnnotatorClient()

    with open(path, "rb") as image_file:
        content = image_file.read()

    image = vision.Image(content=content)

    response = client.document_text_detection(image=image)

    for page in response.full_text_annotation.pages:
        for block in page.blocks:
            print(f"\nBlock confidence: {block.confidence}\n")

            for paragraph in block.paragraphs:
                print("Paragraph confidence: {}".format(paragraph.confidence))

                for word in paragraph.words:
                    word_text = "".join([symbol.text for symbol in word.symbols])
                    print(
                        "Word text: {} (confidence: {})".format(
                            word_text, word.confidence
                        )
                    )

                    for symbol in word.symbols:
                        print(
                            "\tSymbol: {} (confidence: {})".format(
                                symbol.text, symbol.confidence
                            )
                        )

    if response.error.message:
        raise Exception(
            "{}\nFor more info on error messages, check: "
            "https://cloud.google.com/apis/design/errors".format(response.error.message)
        )

後續步驟

如要搜尋及篩選其他 Google Cloud 產品的程式碼範例，請參閱Google Cloud 範例瀏覽工具。