private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vision.v1p4beta1.ReferenceImage,
            com.google.cloud.vision.v1p4beta1.ReferenceImage.Builder,
            com.google.cloud.vision.v1p4beta1.ReferenceImageOrBuilder>
        getReferenceImageFieldBuilder() {
      if (referenceImageBuilder_ == null) {
        referenceImageBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vision.v1p4beta1.ReferenceImage,
                com.google.cloud.vision.v1p4beta1.ReferenceImage.Builder,
                com.google.cloud.vision.v1p4beta1.ReferenceImageOrBuilder>(
                getReferenceImage(), getParentForChildren(), isClean());
        referenceImage_ = null;
      }
      return referenceImageBuilder_;
    }
<pre>
Required. The reference image to create.
If an image ID is specified, it is ignored.
</pre>

<code>
.google.cloud.vision.v1p4beta1.ReferenceImage reference_image = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vision/proto-google-cloud-vision-v1p4beta1/src/main/java/com/google/cloud/vision/v1p4beta1/CreateReferenceImageRequest.java