1/*M/////////////////////////////////////////////////////////////////////////////////////// 2// 3// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING. 4// 5// By downloading, copying, installing or using the software you agree to this license. 6// If you do not agree to this license, do not download, install, 7// copy or use the software. 8// 9// 10// License Agreement 11// For Open Source Computer Vision Library 12// 13// Copyright (C) 2013, OpenCV Foundation, all rights reserved. 14// Third party copyrights are property of their respective owners. 15// 16// Redistribution and use in source and binary forms, with or without modification, 17// are permitted provided that the following conditions are met: 18// 19// * Redistribution's of source code must retain the above copyright notice, 20// this list of conditions and the following disclaimer. 21// 22// * Redistribution's in binary form must reproduce the above copyright notice, 23// this list of conditions and the following disclaimer in the documentation 24// and/or other materials provided with the distribution. 25// 26// * The name of the copyright holders may not be used to endorse or promote products 27// derived from this software without specific prior written permission. 28// 29// This software is provided by the copyright holders and contributors "as is" and 30// any express or implied warranties, including, but not limited to, the implied 31// warranties of merchantability and fitness for a particular purpose are disclaimed. 32// In no event shall the Intel Corporation or contributors be liable for any direct, 33// indirect, incidental, special, exemplary, or consequential damages 34// (including, but not limited to, procurement of substitute goods or services; 35// loss of use, data, or profits; or business interruption) however caused 36// and on any theory of liability, whether in contract, strict liability, 37// or tort (including negligence or otherwise) arising in any way out of 38// the use of this software, even if advised of the possibility of such damage. 39// 40//M*/ 41 42__kernel void im2col(__global const T *im_src, int im_src_offset, 43 int channels, int height_inp, int width_inp, 44 int kernel_h, int kernel_w, int pad_h, int pad_w, int stride_h, int stride_w, 45 int height_out, int width_out, 46 __global T *im_col, int im_col_offset 47 ) 48{ 49 int index = get_global_id(0); 50 if (index >= height_out * width_out * channels) 51 return; 52 int j_out = index % width_out; 53 int i_out = (index / width_out) % height_out; 54 int c_inp = (index / width_out) / height_out; 55 56 int c_out = c_inp * kernel_h * kernel_w; 57 int i_inp = i_out * stride_h - pad_h; 58 int j_inp = j_out * stride_w - pad_w; 59 60 im_src += (c_inp * height_inp + i_inp) * width_inp + j_inp + im_src_offset; 61 im_col += (c_out * height_out + i_out) * width_out + j_out + im_col_offset; 62 63 for (int ki = 0; ki < kernel_h; ++ki) 64 for (int kj = 0; kj < kernel_w; ++kj) { 65 int i = i_inp + ki; 66 int j = j_inp + kj; 67 *im_col = (i >= 0 && j >= 0 && i < height_inp && j < width_inp) ? 68 im_src[ki * width_inp + kj] : 0; 69 im_col += height_out * width_out; 70 } 71} 72