com.intel.analytics.bigdl.dataset.image.HFlip.scala Maven / Gradle / Ivy
/*
* Copyright 2016 The BigDL Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License 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 com.intel.analytics.bigdl.dataset.image
import com.intel.analytics.bigdl.dataset.Transformer
import com.intel.analytics.bigdl.utils.RandomGenerator
import scala.collection.Iterator
object HFlip {
def apply(threshold: Double = 0.0): HFlip = {
new HFlip(threshold)
}
}
/**
* Flip a image with a probability. The threshold higher, the less easier to flip the image.
* @param threshold
*/
class HFlip(threshold: Double) extends Transformer[LabeledBGRImage, LabeledBGRImage] {
override def apply(prev: Iterator[LabeledBGRImage]): Iterator[LabeledBGRImage] = {
prev.map(img => {
if (RandomGenerator.RNG.uniform(0, 1) >= threshold) {
img.hflip()
} else {
img
}
})
}
}