diff options
Diffstat (limited to 'src/core/CL/cl_kernels/common/nonmax.cl')
| -rw-r--r-- | src/core/CL/cl_kernels/common/nonmax.cl | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/core/CL/cl_kernels/common/nonmax.cl b/src/core/CL/cl_kernels/common/nonmax.cl new file mode 100644 index 0000000000..702e635a89 --- /dev/null +++ b/src/core/CL/cl_kernels/common/nonmax.cl @@ -0,0 +1,70 @@ +/* + * Copyright (c) 2016-2021 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. + */ +#include "helpers.h" + +/** This function performs Non maxima suppression over a 3x3 window on a given image. + * + * @param[in] src_ptr Pointer to the source image. Supported data types: U8/F32 + * @param[in] src_stride_x Stride of the source image in X dimension (in bytes) + * @param[in] src_step_x src_stride_x * number of elements along X processed per workitem(in bytes) + * @param[in] src_stride_y Stride of the source image in Y dimension (in bytes) + * @param[in] src_step_y src_stride_y * number of elements along Y processed per workitem(in bytes) + * @param[in] src_offset_first_element_in_bytes The offset of the first element in the source image + * @param[out] dst_ptr Pointer to the destination image. Supported data types: same as @p scr_ptr + * @param[in] dst_stride_x Stride of the destination image in X dimension (in bytes) + * @param[in] dst_step_x dst_stride_x * number of elements along X processed per workitem(in bytes) + * @param[in] dst_stride_y Stride of the destination image in Y dimension (in bytes) + * @param[in] dst_step_y dst_stride_y * number of elements along Y processed per workitem(in bytes) + * @param[in] dst_offset_first_element_in_bytes The offset of the first element in the destination image + */ +__kernel void non_max_suppression( + IMAGE_DECLARATION(src), + IMAGE_DECLARATION(dst)) +{ + Image src = CONVERT_TO_IMAGE_STRUCT(src); + Image dst = CONVERT_TO_IMAGE_STRUCT(dst); + + VEC_DATA_TYPE(DATA_TYPE, 8) + vc = vload8(0, (__global DATA_TYPE *)src.ptr); + + if(all(vc == (DATA_TYPE)0)) + { + vstore8(0, 0, (__global DATA_TYPE *)dst.ptr); + + return; + } + + VEC_DATA_TYPE(DATA_TYPE, 16) + nc = vload16(0, (__global DATA_TYPE *)offset(&src, -1, -1)); + VEC_DATA_TYPE(DATA_TYPE, 8) + out = select((DATA_TYPE)0, vc, (vc >= nc.s01234567) && (vc >= nc.s12345678) && (vc >= nc.s23456789)); + + nc = vload16(0, (__global DATA_TYPE *)offset(&src, -1, 0)); + out = select((DATA_TYPE)0, out, (vc >= nc.s01234567) && (vc > nc.s23456789)); + + nc = vload16(0, (__global DATA_TYPE *)offset(&src, -1, +1)); + out = select((DATA_TYPE)0, out, (vc > nc.s01234567) && (vc > nc.s12345678) && (vc > nc.s23456789)); + + vstore8(out, 0, (__global DATA_TYPE *)dst.ptr); +} |