ai.djl.modality.cv.transform.RandomResizedCrop Maven / Gradle / Ivy
/*
* Copyright 2020 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 crop the input image with random scale and aspect ratio. */
public class RandomResizedCrop implements Transform {
private int width;
private int height;
private double minAreaScale;
private double maxAreaScale;
private double minAspectRatio;
private double maxAspectRatio;
/**
* Creates a {@code RandomResizedCrop} {@link Transform}.
*
* @param width the output width of the image
* @param height the output height of the image
* @param minAreaScale minimum targetArea/srcArea value
* @param maxAreaScale maximum targetArea/srcArea value
* @param minAspectRatio minimum aspect ratio
* @param maxAspectRatio maximum aspect ratio
*/
public RandomResizedCrop(
int width,
int height,
double minAreaScale,
double maxAreaScale,
double minAspectRatio,
double maxAspectRatio) {
this.width = width;
this.height = height;
this.minAreaScale = minAreaScale;
this.maxAreaScale = maxAreaScale;
this.minAspectRatio = minAspectRatio;
this.maxAspectRatio = maxAspectRatio;
}
/**
* Creates a {@code RandomResizedCrop} {@link Transform}.
*
* @param width the output width of the image
* @param height the output height of the image
*/
public RandomResizedCrop(int width, int height) {
this.width = width;
this.height = height;
this.minAreaScale = 0.08;
this.maxAreaScale = 1.0;
this.minAspectRatio = 3.0 / 4.0;
this.maxAspectRatio = 4.0 / 3.0;
}
/** {@inheritDoc} */
@Override
public NDArray transform(NDArray array) {
return NDImageUtils.randomResizedCrop(
array, width, height, minAreaScale, maxAreaScale, minAspectRatio, maxAspectRatio);
}
}