public static Builder newBuilder(com.google.cloud.vision.v1p1beta1.CropHint prototype) {
    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
  }
<pre>
Fraction of importance of this salient region with respect to the original
image.
</pre>

<code>float importance_fraction = 3;</code>

@return The importanceFraction.
java-vision/proto-google-cloud-vision-v1p1beta1/src/main/java/com/google/cloud/vision/v1p1beta1/CropHint.java