public Builder clearReferenceImage() {
      bitField0_ = (bitField0_ & ~0x00000002);
      referenceImage_ = null;
      if (referenceImageBuilder_ != null) {
        referenceImageBuilder_.dispose();
        referenceImageBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Required. The reference image to create.
If an image ID is specified, it is ignored.
</pre>

<code>
.google.cloud.vision.v1p3beta1.ReferenceImage reference_image = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vision/proto-google-cloud-vision-v1p3beta1/src/main/java/com/google/cloud/vision/v1p3beta1/CreateReferenceImageRequest.java