1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/*
* Copyright (c) 2020-2021 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 SRC_CORE_HELPERS_SCALEHELPERS_H
#define SRC_CORE_HELPERS_SCALEHELPERS_H
#include "arm_compute/core/Error.h"
#include "arm_compute/core/QuantizationInfo.h"
#include <algorithm>
#include <cmath>
#include <cstddef>
#include <cstdint>
namespace arm_compute
{
namespace scale_helpers
{
/** Computes bilinear interpolation for quantized input and output, using the pointer to the top-left pixel and the pixel's distance between
* the real coordinates and the smallest following integer coordinates. Input must be QASYMM8 and in single channel format.
*
* @param[in] pixel_ptr Pointer to the top-left pixel value of a single channel input.
* @param[in] stride Stride to access the bottom-left and bottom-right pixel values
* @param[in] dx Pixel's distance between the X real coordinate and the smallest X following integer
* @param[in] dy Pixel's distance between the Y real coordinate and the smallest Y following integer
* @param[in] iq_info Input QuantizationInfo
* @param[in] oq_info Output QuantizationInfo
*
* @note dx and dy must be in the range [0, 1.0]
*
* @return The bilinear interpolated pixel value
*/
inline uint8_t delta_bilinear_c1_quantized(const uint8_t *pixel_ptr,
size_t stride,
float dx,
float dy,
UniformQuantizationInfo iq_info,
UniformQuantizationInfo oq_info)
{
ARM_COMPUTE_ERROR_ON(pixel_ptr == nullptr);
const float dx1 = 1.0f - dx;
const float dy1 = 1.0f - dy;
const float a00 = dequantize_qasymm8(*pixel_ptr, iq_info);
const float a01 = dequantize_qasymm8(*(pixel_ptr + 1), iq_info);
const float a10 = dequantize_qasymm8(*(pixel_ptr + stride), iq_info);
const float a11 = dequantize_qasymm8(*(pixel_ptr + stride + 1), iq_info);
const float w1 = dx1 * dy1;
const float w2 = dx * dy1;
const float w3 = dx1 * dy;
const float w4 = dx * dy;
float res = a00 * w1 + a01 * w2 + a10 * w3 + a11 * w4;
return static_cast<uint8_t>(quantize_qasymm8(res, oq_info));
}
/** Computes bilinear interpolation for quantized input and output, using the pointer to the top-left pixel and the pixel's distance between
* the real coordinates and the smallest following integer coordinates. Input must be QASYMM8_SIGNED and in single channel format.
*
* @param[in] pixel_ptr Pointer to the top-left pixel value of a single channel input.
* @param[in] stride Stride to access the bottom-left and bottom-right pixel values
* @param[in] dx Pixel's distance between the X real coordinate and the smallest X following integer
* @param[in] dy Pixel's distance between the Y real coordinate and the smallest Y following integer
* @param[in] iq_info Input QuantizationInfo
* @param[in] oq_info Output QuantizationInfo
*
* @note dx and dy must be in the range [0, 1.0]
*
* @return The bilinear interpolated pixel value
*/
inline int8_t delta_bilinear_c1_quantized(const int8_t *pixel_ptr,
size_t stride,
float dx,
float dy,
UniformQuantizationInfo iq_info,
UniformQuantizationInfo oq_info)
{
ARM_COMPUTE_ERROR_ON(pixel_ptr == nullptr);
const float dx1 = 1.0f - dx;
const float dy1 = 1.0f - dy;
const float a00 = dequantize_qasymm8_signed(*pixel_ptr, iq_info);
const float a01 = dequantize_qasymm8_signed(*(pixel_ptr + 1), iq_info);
const float a10 = dequantize_qasymm8_signed(*(pixel_ptr + stride), iq_info);
const float a11 = dequantize_qasymm8_signed(*(pixel_ptr + stride + 1), iq_info);
const float w1 = dx1 * dy1;
const float w2 = dx * dy1;
const float w3 = dx1 * dy;
const float w4 = dx * dy;
float res = a00 * w1 + a01 * w2 + a10 * w3 + a11 * w4;
return static_cast<int8_t>(quantize_qasymm8_signed(res, oq_info));
}
/** Return the pixel at (x,y) using area interpolation by clamping when out of borders. The image must be single channel U8
*
* @note The interpolation area depends on the width and height ration of the input and output images
* @note Currently average of the contributing pixels is calculated
*
* @param[in] first_pixel_ptr Pointer to the first pixel of a single channel U8 image.
* @param[in] stride Stride in bytes of the image
* @param[in] width Width of the image
* @param[in] height Height of the image
* @param[in] wr Width ratio among the input image width and output image width.
* @param[in] hr Height ratio among the input image height and output image height.
* @param[in] x X position of the wanted pixel
* @param[in] y Y position of the wanted pixel
*
* @return The pixel at (x, y) using area interpolation.
*/
inline uint8_t pixel_area_c1u8_clamp(
const uint8_t *first_pixel_ptr, size_t stride, size_t width, size_t height, float wr, float hr, int x, int y)
{
ARM_COMPUTE_ERROR_ON(first_pixel_ptr == nullptr);
// Calculate sampling position
float in_x = (x + 0.5f) * wr - 0.5f;
float in_y = (y + 0.5f) * hr - 0.5f;
// Get bounding box offsets
int x_from = std::floor(x * wr - 0.5f - in_x);
int y_from = std::floor(y * hr - 0.5f - in_y);
int x_to = std::ceil((x + 1) * wr - 0.5f - in_x);
int y_to = std::ceil((y + 1) * hr - 0.5f - in_y);
// Clamp position to borders
in_x = std::max(-1.f, std::min(in_x, static_cast<float>(width)));
in_y = std::max(-1.f, std::min(in_y, static_cast<float>(height)));
// Clamp bounding box offsets to borders
x_from = ((in_x + x_from) < -1) ? -1 : x_from;
y_from = ((in_y + y_from) < -1) ? -1 : y_from;
x_to = ((in_x + x_to) > width) ? (width - in_x) : x_to;
y_to = ((in_y + y_to) > height) ? (height - in_y) : y_to;
// Get pixel index
const int xi = std::floor(in_x);
const int yi = std::floor(in_y);
// Bounding box elements in each dimension
const int x_elements = (x_to - x_from + 1);
const int y_elements = (y_to - y_from + 1);
ARM_COMPUTE_ERROR_ON(x_elements == 0 || y_elements == 0);
// Sum pixels in area
int sum = 0;
for (int j = yi + y_from, je = yi + y_to; j <= je; ++j)
{
const uint8_t *ptr = first_pixel_ptr + j * stride + xi + x_from;
sum = std::accumulate(ptr, ptr + x_elements, sum);
}
// Return average
return sum / (x_elements * y_elements);
}
/** Computes bilinear interpolation using the top-left, top-right, bottom-left, bottom-right pixels and the pixel's distance between
* the real coordinates and the smallest following integer coordinates.
*
* @param[in] a00 The top-left pixel value.
* @param[in] a01 The top-right pixel value.
* @param[in] a10 The bottom-left pixel value.
* @param[in] a11 The bottom-right pixel value.
* @param[in] dx_val Pixel's distance between the X real coordinate and the smallest X following integer
* @param[in] dy_val Pixel's distance between the Y real coordinate and the smallest Y following integer
*
* @note dx and dy must be in the range [0, 1.0]
*
* @return The bilinear interpolated pixel value
*/
inline float delta_bilinear(float a00, float a01, float a10, float a11, float dx_val, float dy_val)
{
const float dx1_val = 1.0f - dx_val;
const float dy1_val = 1.0f - dy_val;
const float w1 = dx1_val * dy1_val;
const float w2 = dx_val * dy1_val;
const float w3 = dx1_val * dy_val;
const float w4 = dx_val * dy_val;
return a00 * w1 + a01 * w2 + a10 * w3 + a11 * w4;
}
} // namespace scale_helpers
} // namespace arm_compute
#endif /* SRC_CORE_HELPERS_SCALEHELPERS_H */
|
