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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.
*/
#include "arm_compute/runtime/NEON/functions/NEEqualizeHistogram.h"
#include "arm_compute/core/ITensor.h"
#include "arm_compute/core/TensorInfo.h"
#include "arm_compute/core/Types.h"
#include "arm_compute/core/Validate.h"
#include "arm_compute/runtime/NEON/NEScheduler.h"
#include "src/core/NEON/kernels/NECumulativeDistributionKernel.h"
#include "src/core/NEON/kernels/NEHistogramKernel.h"
#include "src/core/NEON/kernels/NEHistogramKernel.h"
#include "src/core/NEON/kernels/NETableLookupKernel.h"
#include "support/MemorySupport.h"
namespace arm_compute
{
NEEqualizeHistogram::~NEEqualizeHistogram() = default;
NEEqualizeHistogram::NEEqualizeHistogram()
: _histogram_kernel(), _cd_histogram_kernel(), _map_histogram_kernel(), _hist(nr_bins, 0, max_range), _cum_dist(nr_bins, 0, max_range), _cd_lut(nr_bins, DataType::U8)
{
}
void NEEqualizeHistogram::configure(const IImage *input, IImage *output)
{
ARM_COMPUTE_ERROR_ON_TENSOR_NOT_2D(input);
ARM_COMPUTE_ERROR_ON_TENSOR_NOT_2D(output);
ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(input, 1, DataType::U8);
ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(output, 1, DataType::U8);
_histogram_kernel = arm_compute::support::cpp14::make_unique<NEHistogramKernel>();
_cd_histogram_kernel = arm_compute::support::cpp14::make_unique<NECumulativeDistributionKernel>();
_map_histogram_kernel = arm_compute::support::cpp14::make_unique<NETableLookupKernel>();
// Configure kernels
_histogram_kernel->configure(input, &_hist);
_cd_histogram_kernel->configure(input, &_hist, &_cum_dist, &_cd_lut);
_map_histogram_kernel->configure(input, &_cd_lut, output);
}
void NEEqualizeHistogram::run()
{
// Calculate histogram of input.
NEScheduler::get().schedule(_histogram_kernel.get(), Window::DimY);
// Calculate cumulative distribution of histogram and create LUT.
NEScheduler::get().schedule(_cd_histogram_kernel.get(), Window::DimY);
// Map input to output using created LUT.
NEScheduler::get().schedule(_map_histogram_kernel.get(), Window::DimY);
}
} // namespace arm_compute
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