diff options
Diffstat (limited to 'src/core/helpers/ScaleHelpers.h')
| -rw-r--r-- | src/core/helpers/ScaleHelpers.h | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/src/core/helpers/ScaleHelpers.h b/src/core/helpers/ScaleHelpers.h new file mode 100644 index 0000000000..47605e7385 --- /dev/null +++ b/src/core/helpers/ScaleHelpers.h @@ -0,0 +1,207 @@ +/* +* 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 */ |