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/*
* Copyright (c) 2016-2020 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_NEEQUALIZEHISTOGRAM_H
#define ARM_COMPUTE_NEEQUALIZEHISTOGRAM_H
#include "arm_compute/runtime/Distribution1D.h"
#include "arm_compute/runtime/IFunction.h"
#include "arm_compute/runtime/Lut.h"
#include <cstdint>
namespace arm_compute
{
class ITensor;
class NEHistogramKernel;
class NECumulativeDistributionKernel;
class NETableLookupKernel;
using IImage = ITensor;
/** Basic function to execute histogram equalization. This function calls the following NEON kernels:
*
* -# @ref NEHistogramKernel
* -# @ref NECumulativeDistributionKernel
* -# @ref NETableLookupKernel
*
* @deprecated This function is deprecated and is intended to be removed in 21.05 release
*
*/
class NEEqualizeHistogram : public IFunction
{
public:
/** Default Constructor. */
NEEqualizeHistogram();
/** Prevent instances of this class from being copied (As this class contains pointers) */
NEEqualizeHistogram(const NEEqualizeHistogram &) = delete;
/** Prevent instances of this class from being copied (As this class contains pointers) */
NEEqualizeHistogram &operator=(const NEEqualizeHistogram &) = delete;
/** Prevent instances of this class from being moved (As this class contains non movable objects) */
NEEqualizeHistogram(NEEqualizeHistogram &&) = delete;
/** Prevent instances of this class from being moved (As this class contains non movable objects) */
NEEqualizeHistogram &operator=(NEEqualizeHistogram &&) = delete;
/** Default destructor */
~NEEqualizeHistogram();
/** Initialise the kernel's inputs.
*
* @note Currently the width of the input image must be a multiple of 16.
*
* @param[in] input Input image. Data type supported: U8.
* @param[out] output Output image. Data type supported: same as @p input
*/
void configure(const IImage *input, IImage *output);
// Inherited methods overridden:
void run() override;
private:
std::unique_ptr<NEHistogramKernel> _histogram_kernel; /**< Kernel that calculates the histogram of input. */
std::unique_ptr<NECumulativeDistributionKernel> _cd_histogram_kernel; /**< Kernel that calculates the cumulative distribution
and creates the relevant LookupTable. */
std::unique_ptr<NETableLookupKernel> _map_histogram_kernel; /**< Kernel that maps the input to output using the lut. */
Distribution1D _hist; /**< Distribution that holds the histogram of the input image. */
Distribution1D _cum_dist; /**< Distribution that holds the cummulative distribution of the input histogram. */
Lut _cd_lut; /**< Holds the equalization lookuptable. */
static constexpr uint32_t nr_bins{ 256 }; /**< Histogram bins of the internal histograms. */
static constexpr uint32_t max_range{ nr_bins - 1 }; /**< Histogram range of the internal histograms. */
};
}
#endif /*ARM_COMPUTE_NEEQUALIZEHISTOGRAM_H */
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