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/*M///////////////////////////////////////////////////////////////////////////////////////
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// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
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// By downloading, copying, installing or using the software you agree to this license.
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// If you do not agree to this license, do not download, install,
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// copy or use the software.
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// For Open Source Computer Vision Library
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// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
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// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
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// Copyright (C) 2013, OpenCV Foundation, all rights reserved.
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// Third party copyrights are property of their respective owners.
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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// * Redistribution's of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistribution's in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * The name of the copyright holders may not be used to endorse or promote products
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// derived from this software without specific prior written permission.
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// This software is provided by the copyright holders and contributors "as is" and
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// warranties of merchantability and fitness for a particular purpose are disclaimed.
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// and on any theory of liability, whether in contract, strict liability,
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// the use of this software, even if advised of the possibility of such damage.
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#ifndef __OPENCV_CUDEV_GRID_HISTOGRAM_DETAIL_HPP__
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#define __OPENCV_CUDEV_GRID_HISTOGRAM_DETAIL_HPP__
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#include "../../common.hpp"
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#include "../../util/atomic.hpp"
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namespace cv { namespace cudev {
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namespace grid_histogram_detail
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template <int BIN_COUNT, int BLOCK_SIZE, class SrcPtr, typename ResType, class MaskPtr>
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__global__ void histogram(const SrcPtr src, ResType* hist, const MaskPtr mask, const int rows, const int cols)
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#if CV_CUDEV_ARCH >= 120
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__shared__ ResType smem[BIN_COUNT];
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const int y = blockIdx.x * blockDim.y + threadIdx.y;
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const int tid = threadIdx.y * blockDim.x + threadIdx.x;
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for (int i = tid; i < BIN_COUNT; i += BLOCK_SIZE)
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for (int x = threadIdx.x; x < cols; x += blockDim.x)
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const uint data = src(y, x);
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atomicAdd(&smem[data % BIN_COUNT], 1);
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for (int i = tid; i < BIN_COUNT; i += BLOCK_SIZE)
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const ResType histVal = smem[i];
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atomicAdd(hist + i, histVal);
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template <int BIN_COUNT, class Policy, class SrcPtr, typename ResType, class MaskPtr>
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__host__ void histogram(const SrcPtr& src, ResType* hist, const MaskPtr& mask, int rows, int cols, cudaStream_t stream)
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const dim3 block(Policy::block_size_x, Policy::block_size_y);
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const dim3 grid(divUp(rows, block.y));
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const int BLOCK_SIZE = Policy::block_size_x * Policy::block_size_y;
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histogram<BIN_COUNT, BLOCK_SIZE><<<grid, block, 0, stream>>>(src, hist, mask, rows, cols);
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CV_CUDEV_SAFE_CALL( cudaGetLastError() );
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CV_CUDEV_SAFE_CALL( cudaDeviceSynchronize() );