1 /* 2 * Copyright (c) 2016-2020 Arm Limited. 3 * 4 * SPDX-License-Identifier: MIT 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to 8 * deal in the Software without restriction, including without limitation the 9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 10 * sell copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in all 14 * copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22 * SOFTWARE. 23 */ 24 #ifndef ARM_COMPUTE_NECUMULATIVEDISTRIBUTIONKERNEL_H 25 #define ARM_COMPUTE_NECUMULATIVEDISTRIBUTIONKERNEL_H 26 27 #include "src/core/NEON/INEKernel.h" 28 29 #include <cstdint> 30 31 namespace arm_compute 32 { 33 class IDistribution1D; 34 class ILut; 35 class ITensor; 36 using IImage = ITensor; 37 38 /** Interface for the cumulative distribution (cummulative summmation) calculation kernel. 39 * 40 * This kernel calculates the cumulative sum of a given distribution (meaning that each output element 41 * is the sum of all its previous elements including itself) and creates a lookup table with the normalized 42 * pixel intensities which is used for improve the constrast of the image. 43 */ 44 class NECumulativeDistributionKernel : public INEKernel 45 { 46 public: name()47 const char *name() const override 48 { 49 return "NECumulativeDistributionKernel"; 50 } 51 /** Default constructor */ 52 NECumulativeDistributionKernel(); 53 /** Prevent instances of this class from being copied (As this class contains pointers) */ 54 NECumulativeDistributionKernel(const NECumulativeDistributionKernel &) = delete; 55 /** Prevent instances of this class from being copied (As this class contains pointers) */ 56 NECumulativeDistributionKernel &operator=(const NECumulativeDistributionKernel &) = delete; 57 /** Allow instances of this class to be moved */ 58 NECumulativeDistributionKernel(NECumulativeDistributionKernel &&) = default; 59 /** Allow instances of this class to be moved */ 60 NECumulativeDistributionKernel &operator=(NECumulativeDistributionKernel &&) = default; 61 /** Default destructor */ 62 ~NECumulativeDistributionKernel() = default; 63 /** Set the input and output distribution. 64 * 65 * @param[in] input Input image. Data type supported: U8 66 * @param[in] distribution Unnormalized 256-bin distribution of the input image. 67 * @param[out] cumulative_sum Cummulative distribution (Summed histogram). Should be same size as @p distribution. 68 * @param[out] output Equalization lookup table. Should consist of 256 entries of U8 elements. 69 */ 70 void configure(const IImage *input, const IDistribution1D *distribution, IDistribution1D *cumulative_sum, ILut *output); 71 72 // Inherited methods overridden: 73 void run(const Window &window, const ThreadInfo &info) override; 74 bool is_parallelisable() const override; 75 76 private: 77 const IImage *_input; /**< Input image. */ 78 const IDistribution1D *_distribution; /**< Input histogram of the input image. */ 79 IDistribution1D *_cumulative_sum; /**< The cummulative distribution. */ 80 ILut *_output; /**< Output with the equalization lookup table. */ 81 private: 82 static const uint32_t _histogram_size = 256; /**< Default histogram size of 256. */ 83 }; 84 } // namespace arm_compute 85 #endif /*ARM_COMPUTE_NECUMULATIVEDISTRIBUTIONKERNEL_H */ 86