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- /*M///////////////////////////////////////////////////////////////////////////////////////
- //
- // IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
- //
- // By downloading, copying, installing or using the software you agree to this license.
- // If you do not agree to this license, do not download, install,
- // copy or use the software.
- //
- //
- // License Agreement
- // For Open Source Computer Vision Library
- //
- // Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
- // Copyright (C) 2009, Willow Garage Inc., all rights reserved.
- // Copyright (C) 2013, OpenCV Foundation, all rights reserved.
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- // Redistribution and use in source and binary forms, with or without modification,
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- // loss of use, data, or profits; or business interruption) however caused
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- //
- //M*/
- #pragma once
- #ifndef OPENCV_CUDEV_GRID_PYR_DOWN_DETAIL_HPP
- #define OPENCV_CUDEV_GRID_PYR_DOWN_DETAIL_HPP
- #include "../../common.hpp"
- #include "../../util/vec_traits.hpp"
- #include "../../util/saturate_cast.hpp"
- #include "../../util/type_traits.hpp"
- #include "../../ptr2d/glob.hpp"
- #include "../../ptr2d/traits.hpp"
- namespace cv { namespace cudev {
- namespace pyramids_detail
- {
- template <class Brd, class SrcPtr, typename DstType>
- __global__ void pyrDown(const SrcPtr src, GlobPtr<DstType> dst, const int src_rows, const int src_cols, const int dst_cols)
- {
- typedef typename PtrTraits<SrcPtr>::value_type src_type;
- typedef typename VecTraits<src_type>::elem_type src_elem_type;
- typedef typename LargerType<float, src_elem_type>::type work_elem_type;
- typedef typename MakeVec<work_elem_type, VecTraits<src_type>::cn>::type work_type;
- __shared__ work_type smem[256 + 4];
- const int x = blockIdx.x * blockDim.x + threadIdx.x;
- const int y = blockIdx.y;
- const int src_y = 2 * y;
- if (src_y >= 2 && src_y < src_rows - 2 && x >= 2 && x < src_cols - 2)
- {
- {
- work_type sum;
- sum = 0.0625f * src(src_y - 2, x);
- sum = sum + 0.25f * src(src_y - 1, x);
- sum = sum + 0.375f * src(src_y , x);
- sum = sum + 0.25f * src(src_y + 1, x);
- sum = sum + 0.0625f * src(src_y + 2, x);
- smem[2 + threadIdx.x] = sum;
- }
- if (threadIdx.x < 2)
- {
- const int left_x = x - 2;
- work_type sum;
- sum = 0.0625f * src(src_y - 2, left_x);
- sum = sum + 0.25f * src(src_y - 1, left_x);
- sum = sum + 0.375f * src(src_y , left_x);
- sum = sum + 0.25f * src(src_y + 1, left_x);
- sum = sum + 0.0625f * src(src_y + 2, left_x);
- smem[threadIdx.x] = sum;
- }
- if (threadIdx.x > 253)
- {
- const int right_x = x + 2;
- work_type sum;
- sum = 0.0625f * src(src_y - 2, right_x);
- sum = sum + 0.25f * src(src_y - 1, right_x);
- sum = sum + 0.375f * src(src_y , right_x);
- sum = sum + 0.25f * src(src_y + 1, right_x);
- sum = sum + 0.0625f * src(src_y + 2, right_x);
- smem[4 + threadIdx.x] = sum;
- }
- }
- else
- {
- {
- work_type sum;
- sum = 0.0625f * src(Brd::idx_low(src_y - 2, src_rows) , Brd::idx_high(x, src_cols));
- sum = sum + 0.25f * src(Brd::idx_low(src_y - 1, src_rows) , Brd::idx_high(x, src_cols));
- sum = sum + 0.375f * src(src_y , Brd::idx_high(x, src_cols));
- sum = sum + 0.25f * src(Brd::idx_high(src_y + 1, src_rows), Brd::idx_high(x, src_cols));
- sum = sum + 0.0625f * src(Brd::idx_high(src_y + 2, src_rows), Brd::idx_high(x, src_cols));
- smem[2 + threadIdx.x] = sum;
- }
- if (threadIdx.x < 2)
- {
- const int left_x = x - 2;
- work_type sum;
- sum = 0.0625f * src(Brd::idx_low(src_y - 2, src_rows) , Brd::idx_low(Brd::idx_high(left_x, src_cols), src_cols));
- sum = sum + 0.25f * src(Brd::idx_low(src_y - 1, src_rows) , Brd::idx_low(Brd::idx_high(left_x, src_cols), src_cols));
- sum = sum + 0.375f * src(src_y , Brd::idx_low(Brd::idx_high(left_x, src_cols), src_cols));
- sum = sum + 0.25f * src(Brd::idx_high(src_y + 1, src_rows), Brd::idx_low(Brd::idx_high(left_x, src_cols), src_cols));
- sum = sum + 0.0625f * src(Brd::idx_high(src_y + 2, src_rows), Brd::idx_low(Brd::idx_high(left_x, src_cols), src_cols));
- smem[threadIdx.x] = sum;
- }
- if (threadIdx.x > 253)
- {
- const int right_x = x + 2;
- work_type sum;
- sum = 0.0625f * src(Brd::idx_low(src_y - 2, src_rows) , Brd::idx_high(right_x, src_cols));
- sum = sum + 0.25f * src(Brd::idx_low(src_y - 1, src_rows) , Brd::idx_high(right_x, src_cols));
- sum = sum + 0.375f * src(src_y , Brd::idx_high(right_x, src_cols));
- sum = sum + 0.25f * src(Brd::idx_high(src_y + 1, src_rows), Brd::idx_high(right_x, src_cols));
- sum = sum + 0.0625f * src(Brd::idx_high(src_y + 2, src_rows), Brd::idx_high(right_x, src_cols));
- smem[4 + threadIdx.x] = sum;
- }
- }
- __syncthreads();
- if (threadIdx.x < 128)
- {
- const int tid2 = threadIdx.x * 2;
- work_type sum;
- sum = 0.0625f * smem[2 + tid2 - 2];
- sum = sum + 0.25f * smem[2 + tid2 - 1];
- sum = sum + 0.375f * smem[2 + tid2 ];
- sum = sum + 0.25f * smem[2 + tid2 + 1];
- sum = sum + 0.0625f * smem[2 + tid2 + 2];
- const int dst_x = (blockIdx.x * blockDim.x + tid2) / 2;
- if (dst_x < dst_cols)
- dst(y, dst_x) = saturate_cast<DstType>(sum);
- }
- }
- template <class Brd, class SrcPtr, typename DstType>
- __host__ void pyrDown(const SrcPtr& src, const GlobPtr<DstType>& dst, int src_rows, int src_cols, int dst_rows, int dst_cols, cudaStream_t stream)
- {
- const dim3 block(256);
- const dim3 grid(divUp(src_cols, block.x), dst_rows);
- pyrDown<Brd><<<grid, block, 0, stream>>>(src, dst, src_rows, src_cols, dst_cols);
- CV_CUDEV_SAFE_CALL( cudaGetLastError() );
- if (stream == 0)
- CV_CUDEV_SAFE_CALL( cudaDeviceSynchronize() );
- }
- }
- }}
- #endif
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