@java.lang.Override
  public Builder toBuilder() {
    return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
  }
<pre>
If present, contextual information is needed to understand where this image
comes from.
</pre>

<code>.google.cloud.vision.v1p3beta1.ImageAnnotationContext context = 21;</code>
java-vision/proto-google-cloud-vision-v1p3beta1/src/main/java/com/google/cloud/vision/v1p3beta1/AnnotateImageResponse.java