UAVProduct/SiftGPU/SiftMatchCU.cpp
////////////////////////////////////////////////////////////////////////////
// File: SiftMatchCU.cpp
// Author: Changchang Wu
// Description : implementation of the SiftMatchCU class.
// CUDA-based implementation of SiftMatch
//
// Copyright (c) 2007 University of North Carolina at Chapel Hill
// All Rights Reserved
//
// Permission to use, copy, modify and distribute this software and its
// documentation for educational, research and non-profit purposes, without
// fee, and without a written agreement is hereby granted, provided that the
// above copyright notice and the following paragraph appear in all copies.
//
// The University of North Carolina at Chapel Hill make no representations
// about the suitability of this software for any purpose. It is provided
// 'as is' without express or implied warranty.
//
// Please send BUG REPORTS to ccwu@cs.unc.edu
//
////////////////////////////////////////////////////////////////////////////
#if defined(CUDA_SIFTGPU_ENABLED)
#include "GL/glew.h"
#include <iostream>
#include <vector>
#include <algorithm>
#include <stdlib.h>
#include <math.h>
using namespace std;
#include "GlobalUtil.h"
#include "CuTexImage.h"
#include "SiftGPU.h"
#include "ProgramCU.h"
#include "SiftMatchCU.h"
SiftMatchCU::SiftMatchCU(int max_sift):SiftMatchGPU()
{
_num_sift[0] = _num_sift[1] = 0;
_id_sift[0] = _id_sift[1] = 0;
_have_loc[0] = _have_loc[1] = 0;
_max_sift = max_sift <=0 ? 4096 : ((max_sift + 31)/ 32 * 32) ;
_initialized = 0;
}
void SiftMatchCU::SetMaxSift(int max_sift)
{
max_sift = ((max_sift + 31)/32)*32;
if(max_sift > GlobalUtil::_texMaxDimGL) max_sift = GlobalUtil::_texMaxDimGL;
_max_sift = max_sift;
}
int SiftMatchCU::CheckCudaDevice(int device)
{
return ProgramCU::CheckCudaDevice(device);
}
void SiftMatchCU::InitSiftMatch()
{
if(_initialized) return;
GlobalUtil::_GoodOpenGL = max(GlobalUtil::_GoodOpenGL, 1);
_initialized = 1;
}
void SiftMatchCU::SetDescriptors(int index, int num, const unsigned char* descriptors, int id)
{
if(_initialized == 0) return;
if (index > 1) index = 1;
if (index < 0) index = 0;
_have_loc[index] = 0;
//the same feature is already set
if(id !=-1 && id == _id_sift[index]) return ;
_id_sift[index] = id;
if(num > _max_sift) num = _max_sift;
_num_sift[index] = num;
_texDes[index].InitTexture(8 * num, 1, 4);
_texDes[index].CopyFromHost((void*)descriptors);
}
void SiftMatchCU::SetDescriptors(int index, int num, const float* descriptors, int id)
{
if(_initialized == 0) return;
if (index > 1) index = 1;
if (index < 0) index = 0;
if(num > _max_sift) num = _max_sift;
sift_buffer.resize(num * 128 /4);
unsigned char * pub = (unsigned char*) &sift_buffer[0];
for(int i = 0; i < 128 * num; ++i)
{
pub[i] = int(512 * descriptors[i] + 0.5);
}
SetDescriptors(index, num, pub, id);
}
void SiftMatchCU::SetFeautreLocation(int index, const float* locations, int gap)
{
if(_num_sift[index] <=0) return;
_texLoc[index].InitTexture(_num_sift[index], 1, 2);
if(gap == 0)
{
_texLoc[index].CopyFromHost(locations);
}else
{
sift_buffer.resize(_num_sift[index] * 2);
float* pbuf = (float*) (&sift_buffer[0]);
for(int i = 0; i < _num_sift[index]; ++i)
{
pbuf[i*2] = *locations++;
pbuf[i*2+1]= *locations ++;
locations += gap;
}
_texLoc[index].CopyFromHost(pbuf);
}
_have_loc[index] = 1;
}
int SiftMatchCU::GetGuidedSiftMatch(int max_match, int match_buffer[][2], float H[3][3], float F[3][3],
float distmax, float ratiomax, float hdistmax, float fdistmax, int mbm)
{
if(_initialized ==0) return 0;
if(_num_sift[0] <= 0 || _num_sift[1] <=0) return 0;
if(_have_loc[0] == 0 || _have_loc[1] == 0) return 0;
ProgramCU::MultiplyDescriptorG(_texDes, _texDes+1, _texLoc, _texLoc + 1,
&_texDot, (mbm? &_texCRT: NULL), H, hdistmax, F, fdistmax);
return GetBestMatch(max_match, match_buffer, distmax, ratiomax, mbm);
}
int SiftMatchCU::GetSiftMatch(int max_match, int match_buffer[][2], float distmax, float ratiomax, int mbm)
{
if(_initialized ==0) return 0;
if(_num_sift[0] <= 0 || _num_sift[1] <=0) return 0;
ProgramCU::MultiplyDescriptor(_texDes, _texDes + 1, &_texDot, (mbm? &_texCRT: NULL));
return GetBestMatch(max_match, match_buffer, distmax, ratiomax, mbm);
}
int SiftMatchCU::GetBestMatch(int max_match, int match_buffer[][2], float distmax, float ratiomax, int mbm)
{
sift_buffer.resize(_num_sift[0] + _num_sift[1]);
int * buffer1 = (int*) &sift_buffer[0], * buffer2 = (int*) &sift_buffer[_num_sift[0]];
_texMatch[0].InitTexture(_num_sift[0], 1);
ProgramCU::GetRowMatch(&_texDot, _texMatch, distmax, ratiomax);
_texMatch[0].CopyToHost(buffer1);
if(mbm)
{
_texMatch[1].InitTexture(_num_sift[1], 1);
ProgramCU::GetColMatch(&_texCRT, _texMatch + 1, distmax, ratiomax);
_texMatch[1].CopyToHost(buffer2);
}
int nmatch = 0, j ;
for(int i = 0; i < _num_sift[0] && nmatch < max_match; ++i)
{
j = int(buffer1[i]);
if( j>= 0 && (!mbm ||int(buffer2[j]) == i))
{
match_buffer[nmatch][0] = i;
match_buffer[nmatch][1] = j;
nmatch++;
}
}
return nmatch;
}
#endif