1 /*
2 * Copyright (c) 2017-2019 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/core/Helpers.h"
25
26 #include "Utils.h"
27 #include "WarpPerspective.h"
28
29 namespace arm_compute
30 {
31 namespace test
32 {
33 namespace validation
34 {
35 namespace reference
36 {
37 template <typename T>
warp_perspective(const SimpleTensor<T> & src,SimpleTensor<T> & valid_mask,const float * matrix,InterpolationPolicy policy,BorderMode border_mode,uint8_t constant_border_value)38 SimpleTensor<T> warp_perspective(const SimpleTensor<T> &src, SimpleTensor<T> &valid_mask, const float *matrix, InterpolationPolicy policy, BorderMode border_mode, uint8_t constant_border_value)
39 {
40 SimpleTensor<T> dst(src.shape(), src.data_type());
41
42 // x0 = M00 * x + M01 * y + M02
43 // y0 = M10 * x + M11 * y + M12
44 // z0 = M20 * x + M21 * y + M22
45 // xn = x0 / z0
46 // yn = y0 / z0
47 const float M00 = matrix[0];
48 const float M10 = matrix[1];
49 const float M20 = matrix[2];
50 const float M01 = matrix[0 + 1 * 3];
51 const float M11 = matrix[1 + 1 * 3];
52 const float M21 = matrix[2 + 1 * 3];
53 const float M02 = matrix[0 + 2 * 3];
54 const float M12 = matrix[1 + 2 * 3];
55 const float M22 = matrix[2 + 2 * 3];
56
57 const int width = src.shape().x();
58 const int height = src.shape().y();
59
60 const uint32_t num_elements = src.num_elements();
61 for(uint32_t element_idx = 0; element_idx < num_elements; ++element_idx)
62 {
63 valid_mask[element_idx] = 1;
64 Coordinates id = index2coord(src.shape(), element_idx);
65 const int idx = id.x();
66 const int idy = id.y();
67 const float z0 = M20 * idx + M21 * idy + M22;
68
69 const float x0 = (M00 * idx + M01 * idy + M02);
70 const float y0 = (M10 * idx + M11 * idy + M12);
71
72 const float xn = x0 / z0;
73 const float yn = y0 / z0;
74 id.set(0, static_cast<int>(std::floor(xn)));
75 id.set(1, static_cast<int>(std::floor(yn)));
76 if((0 <= yn) && (yn < height) && (0 <= xn) && (xn < width))
77 {
78 switch(policy)
79 {
80 case InterpolationPolicy::NEAREST_NEIGHBOR:
81 dst[element_idx] = tensor_elem_at(src, id, border_mode, constant_border_value);
82 break;
83 case InterpolationPolicy::BILINEAR:
84 (valid_bilinear_policy(xn, yn, width, height, border_mode)) ? dst[element_idx] = bilinear_policy(src, id, xn, yn, border_mode, constant_border_value) : valid_mask[element_idx] = 0;
85 break;
86 case InterpolationPolicy::AREA:
87 default:
88 ARM_COMPUTE_ERROR("Interpolation not supported");
89 break;
90 }
91 }
92 else
93 {
94 if(border_mode == BorderMode::UNDEFINED)
95 {
96 valid_mask[element_idx] = 0;
97 }
98 else
99 {
100 switch(policy)
101 {
102 case InterpolationPolicy::NEAREST_NEIGHBOR:
103 if(border_mode == BorderMode::CONSTANT)
104 {
105 dst[element_idx] = constant_border_value;
106 }
107 else if(border_mode == BorderMode::REPLICATE)
108 {
109 id.set(0, std::max(0, std::min(static_cast<int>(xn), width - 1)));
110 id.set(1, std::max(0, std::min(static_cast<int>(yn), height - 1)));
111 dst[element_idx] = src[coord2index(src.shape(), id)];
112 }
113 break;
114 case InterpolationPolicy::BILINEAR:
115 dst[element_idx] = bilinear_policy(src, id, xn, yn, border_mode, constant_border_value);
116 break;
117 case InterpolationPolicy::AREA:
118 default:
119 ARM_COMPUTE_ERROR("Interpolation not supported");
120 break;
121 }
122 }
123 }
124 }
125 return dst;
126 }
127
128 template SimpleTensor<uint8_t> warp_perspective(const SimpleTensor<uint8_t> &src, SimpleTensor<uint8_t> &valid_mask, const float *matrix, InterpolationPolicy policy, BorderMode border_mode,
129 uint8_t constant_border_value);
130 } // namespace reference
131 } // namespace validation
132 } // namespace test
133 } // namespace arm_compute
134