| /* |
| * Copyright (c) 2016, 2017 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/core/NEON/kernels/NECumulativeDistributionKernel.h" |
| #include "arm_compute/core/NEON/kernels/NEHistogramKernel.h" |
| #include "arm_compute/core/NEON/kernels/NETableLookupKernel.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; |
| using IImage = ITensor; |
| |
| /** Basic function to execute histogram equalization. This function calls the following NEON kernels: |
| * |
| * -# @ref NEHistogramKernel |
| * -# @ref NECumulativeDistributionKernel |
| * -# @ref NETableLookupKernel |
| * |
| */ |
| class NEEqualizeHistogram : public IFunction |
| { |
| public: |
| /** Default Constructor. */ |
| 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: |
| NEHistogramKernel _histogram_kernel; /**< Kernel that calculates the histogram of input. */ |
| NECumulativeDistributionKernel _cd_histogram_kernel; /**< Kernel that calculates the cumulative distribution |
| and creates the relevant LookupTable. */ |
| 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__ */ |