private void ensureVerticesIsMutable() {
      if (!((bitField0_ & 0x00000001) != 0)) {
        vertices_ = new java.util.ArrayList<com.google.cloud.vision.v1p1beta1.Vertex>(vertices_);
        bitField0_ |= 0x00000001;
      }
    }
<pre>
A bounding polygon for the detected image annotation.
</pre>

Protobuf type {@code google.cloud.vision.v1p1beta1.BoundingPoly}
java-vision/proto-google-cloud-vision-v1p1beta1/src/main/java/com/google/cloud/vision/v1p1beta1/BoundingPoly.java