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) 2010-2012, Institute Of Software Chinese Academy Of Science, all rights reserved. 14// Copyright (C) 2010-2012, Advanced Micro Devices, Inc., all rights reserved. 15// Third party copyrights are property of their respective owners. 16// 17// @Authors 18// Shengen Yan,yanshengen@gmail.com 19// 20// Redistribution and use in source and binary forms, with or without modification, 21// are permitted provided that the following conditions are met: 22// 23// * Redistribution's of source code must retain the above copyright notice, 24// this list of conditions and the following disclaimer. 25// 26// * Redistribution's in binary form must reproduce the above copyright notice, 27// this list of conditions and the following disclaimer in the documentation 28// and/or other materials provided with the distribution. 29// 30// * The name of the copyright holders may not be used to endorse or promote products 31// derived from this software without specific prior written permission. 32// 33// This software is provided by the copyright holders and contributors as is and 34// any express or implied warranties, including, but not limited to, the implied 35// warranties of merchantability and fitness for a particular purpose are disclaimed. 36// In no event shall the Intel Corporation or contributors be liable for any direct, 37// indirect, incidental, special, exemplary, or consequential damages 38// (including, but not limited to, procurement of substitute goods or services; 39// loss of use, data, or profits; or business interruption) however caused 40// and on any theory of liability, whether in contract, strict liability, 41// or tort (including negligence or otherwise) arising in any way out of 42// the use of this software, even if advised of the possibility of such damage. 43// 44//M*/ 45 46__kernel void preCornerDetect(__global const uchar * Dxptr, int dx_step, int dx_offset, 47 __global const uchar * Dyptr, int dy_step, int dy_offset, 48 __global const uchar * D2xptr, int d2x_step, int d2x_offset, 49 __global const uchar * D2yptr, int d2y_step, int d2y_offset, 50 __global const uchar * Dxyptr, int dxy_step, int dxy_offset, 51 __global uchar * dstptr, int dst_step, int dst_offset, 52 int dst_rows, int dst_cols, float factor) 53{ 54 int x = get_global_id(0); 55 int y = get_global_id(1); 56 57 if (x < dst_cols && y < dst_rows) 58 { 59 int dx_index = mad24(dx_step, y, (int)sizeof(float) * x + dx_offset); 60 int dy_index = mad24(dy_step, y, (int)sizeof(float) * x + dy_offset); 61 int d2x_index = mad24(d2x_step, y, (int)sizeof(float) * x + d2x_offset); 62 int d2y_index = mad24(d2y_step, y, (int)sizeof(float) * x + d2y_offset); 63 int dxy_index = mad24(dxy_step, y, (int)sizeof(float) * x + dxy_offset); 64 int dst_index = mad24(dst_step, y, (int)sizeof(float) * x + dst_offset); 65 66 float dx = *(__global const float *)(Dxptr + dx_index); 67 float dy = *(__global const float *)(Dyptr + dy_index); 68 float d2x = *(__global const float *)(D2xptr + d2x_index); 69 float d2y = *(__global const float *)(D2yptr + d2y_index); 70 float dxy = *(__global const float *)(Dxyptr + dxy_index); 71 __global float * dst = (__global float *)(dstptr + dst_index); 72 73 dst[0] = factor * (dx*dx*d2y + dy*dy*d2x - 2*dx*dy*dxy); 74 } 75} 76