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/*
* Copyright (c) 2016-2018 ARM Limited.
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef __ARM_COMPUTE_NECUMULATIVEDISTRIBUTIONKERNEL_H__
#define __ARM_COMPUTE_NECUMULATIVEDISTRIBUTIONKERNEL_H__
#include "arm_compute/core/NEON/INEKernel.h"
#include <cstdint>
namespace arm_compute
{
class IDistribution1D;
class ILut;
class ITensor;
using IImage = ITensor;
/** Interface for the cumulative distribution (cummulative summmation) calculation kernel.
*
* This kernel calculates the cumulative sum of a given distribution (meaning that each output element
* is the sum of all its previous elements including itself) and creates a lookup table with the normalized
* pixel intensities which is used for improve the constrast of the image.
*/
class NECumulativeDistributionKernel : public INEKernel
{
public:
const char *name() const override
{
return "NECumulativeDistributionKernel";
}
/** Default constructor */
NECumulativeDistributionKernel();
/** Prevent instances of this class from being copied (As this class contains pointers) */
NECumulativeDistributionKernel(const NECumulativeDistributionKernel &) = delete;
/** Prevent instances of this class from being copied (As this class contains pointers) */
NECumulativeDistributionKernel &operator=(const NECumulativeDistributionKernel &) = delete;
/** Allow instances of this class to be moved */
NECumulativeDistributionKernel(NECumulativeDistributionKernel &&) = default;
/** Allow instances of this class to be moved */
NECumulativeDistributionKernel &operator=(NECumulativeDistributionKernel &&) = default;
/** Set the input and output distribution.
*
* @param[in] input Input image. Data type supported: U8
* @param[in] distribution Unnormalized 256-bin distribution of the input image.
* @param[out] cumulative_sum Cummulative distribution (Summed histogram). Should be same size as @p distribution.
* @param[out] output Equalization lookup table. Should consist of 256 entries of U8 elements.
*/
void configure(const IImage *input, const IDistribution1D *distribution, IDistribution1D *cumulative_sum, ILut *output);
// Inherited methods overridden:
void run(const Window &window, const ThreadInfo &info) override;
bool is_parallelisable() const override;
private:
const IImage *_input; /**< Input image. */
const IDistribution1D *_distribution; /**< Input histogram of the input image. */
IDistribution1D *_cumulative_sum; /**< The cummulative distribution. */
ILut *_output; /**< Output with the equalization lookup table. */
private:
static const uint32_t _histogram_size = 256; /**< Default histogram size of 256. */
};
} // namespace arm_compute
#endif /*__ARM_COMPUTE_NECUMULATIVEDISTRIBUTIONKERNEL_H__ */
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