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 #include "arm_compute/runtime/NEON/functions/NEEqualizeHistogram.h"
25
26 #include "arm_compute/core/ITensor.h"
27 #include "arm_compute/core/TensorInfo.h"
28 #include "arm_compute/core/Types.h"
29 #include "arm_compute/core/Validate.h"
30 #include "arm_compute/runtime/NEON/NEScheduler.h"
31 #include "src/core/NEON/kernels/NECumulativeDistributionKernel.h"
32 #include "src/core/NEON/kernels/NEHistogramKernel.h"
33 #include "src/core/NEON/kernels/NEHistogramKernel.h"
34 #include "src/core/NEON/kernels/NETableLookupKernel.h"
35 #include "support/MemorySupport.h"
36
37 namespace arm_compute
38 {
39 NEEqualizeHistogram::~NEEqualizeHistogram() = default;
40
NEEqualizeHistogram()41 NEEqualizeHistogram::NEEqualizeHistogram()
42 : _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)
43 {
44 }
45
configure(const IImage * input,IImage * output)46 void NEEqualizeHistogram::configure(const IImage *input, IImage *output)
47 {
48 ARM_COMPUTE_ERROR_ON_TENSOR_NOT_2D(input);
49 ARM_COMPUTE_ERROR_ON_TENSOR_NOT_2D(output);
50 ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(input, 1, DataType::U8);
51 ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(output, 1, DataType::U8);
52
53 _histogram_kernel = arm_compute::support::cpp14::make_unique<NEHistogramKernel>();
54 _cd_histogram_kernel = arm_compute::support::cpp14::make_unique<NECumulativeDistributionKernel>();
55 _map_histogram_kernel = arm_compute::support::cpp14::make_unique<NETableLookupKernel>();
56
57 // Configure kernels
58 _histogram_kernel->configure(input, &_hist);
59 _cd_histogram_kernel->configure(input, &_hist, &_cum_dist, &_cd_lut);
60 _map_histogram_kernel->configure(input, &_cd_lut, output);
61 }
62
run()63 void NEEqualizeHistogram::run()
64 {
65 // Calculate histogram of input.
66 NEScheduler::get().schedule(_histogram_kernel.get(), Window::DimY);
67
68 // Calculate cumulative distribution of histogram and create LUT.
69 NEScheduler::get().schedule(_cd_histogram_kernel.get(), Window::DimY);
70
71 // Map input to output using created LUT.
72 NEScheduler::get().schedule(_map_histogram_kernel.get(), Window::DimY);
73 }
74 } // namespace arm_compute
75