ai.djl.modality.cv.transform.Normalize Maven / Gradle / Ivy
/*
* Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance
* with the License. A copy of the License is located at
*
* http://aws.amazon.com/apache2.0/
*
* or in the "license" file accompanying this file. This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES
* OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions
* and limitations under the License.
*/
package ai.djl.modality.cv.transform;
import ai.djl.modality.cv.util.NDImageUtils;
import ai.djl.ndarray.NDArray;
import ai.djl.translate.Transform;
/** A {@link Transform} that normalizes an image {@link NDArray} of shape CHW or NCHW. */
public class Normalize implements Transform {
private float[] mean;
private float[] std;
/**
* Creates a {@code Normalize} {@link Transform} that normalizes.
*
* @param mean the mean to normalize with for each channel
* @param std the standard deviation to normalize with for each channel
* @see NDImageUtils#normalize(NDArray, float[], float[])
*/
public Normalize(float[] mean, float[] std) {
this.mean = mean;
this.std = std;
}
/** {@inheritDoc} */
@Override
public NDArray transform(NDArray array) {
return NDImageUtils.normalize(array, mean, std);
}
}