Function detectLogo

video-intelligence/detect_logo.js:32–102

()

  // Performs asynchronous video annotation for logo recognition on a file.
  async function detectLogo() {
    const inputContent = fs.readFileSync(localFilePath).toString('base64');

    // Build the request with the input content and logo recognition feature.
    const request = {
      inputContent: inputContent,
      features: ['LOGO_RECOGNITION'],
    };

    // Make the asynchronous request
    const [operation] = await client.annotateVideo(request);

    // Wait for the results
    const [response] = await operation.promise();

    // Get the first response, since we sent only one video.
    const annotationResult = response.annotationResults[0];
    for (const logoRecognitionAnnotation of annotationResult.logoRecognitionAnnotations) {
      const entity = logoRecognitionAnnotation.entity;
      // Opaque entity ID. Some IDs may be available in
      // [Google Knowledge Graph Search API](https://developers.google.com/knowledge-graph/).
      console.log(`Entity Id: ${entity.entityId}`);
      console.log(`Description: ${entity.description}`);

      // All logo tracks where the recognized logo appears.
      // Each track corresponds to one logo instance appearing in consecutive frames.
      for (const track of logoRecognitionAnnotation.tracks) {
        console.log(
          `\n\tStart Time Offset: ${track.segment.startTimeOffset.seconds}.${track.segment.startTimeOffset.nanos}`
        );
        console.log(
          `\tEnd Time Offset: ${track.segment.endTimeOffset.seconds}.${track.segment.endTimeOffset.nanos}`
        );
        console.log(`\tConfidence: ${track.confidence}`);

        // The object with timestamp and attributes per frame in the track.
        for (const timestampedObject of track.timestampedObjects) {
          // Normalized Bounding box in a frame, where the object is located.
          const normalizedBoundingBox = timestampedObject.normalizedBoundingBox;
          console.log(`\n\t\tLeft: ${normalizedBoundingBox.left}`);
          console.log(`\t\tTop: ${normalizedBoundingBox.top}`);
          console.log(`\t\tRight: ${normalizedBoundingBox.right}`);
          console.log(`\t\tBottom: ${normalizedBoundingBox.bottom}`);
          // Optional. The attributes of the object in the bounding box.
          for (const attribute of timestampedObject.attributes) {
            console.log(`\n\t\t\tName: ${attribute.name}`);
            console.log(`\t\t\tConfidence: ${attribute.confidence}`);
            console.log(`\t\t\tValue: ${attribute.value}`);
          }
        }

        // Optional. Attributes in the track level.
        for (const trackAttribute of track.attributes) {
          console.log(`\n\t\tName: ${trackAttribute.name}`);
          console.log(`\t\tConfidence: ${trackAttribute.confidence}`);
          console.log(`\t\tValue: ${trackAttribute.value}`);
        }
      }