/******************************************************************************
* AUTHOR : Bharath A
* DATE : 12-Jun-2008
* NAME : convertFeatVecToTraceGroup
* DESCRIPTION :
* ARGUMENTS :
* RETURNS :
* NOTES :
* CHANGE HISTROY
* Author Date Description
******************************************************************************/
int NPenShapeFeatureExtractor::convertFeatVecToTraceGroup(
const vector<LTKShapeFeaturePtr>& shapeFeature,
LTKTraceGroup& outTraceGroup)
{
LOG(LTKLogger::LTK_LOGLEVEL_DEBUG) << "Entering " <<
"NPenShapeFeatureExtractor::convertFeatVecToTraceGroup()" << endl;
vector<LTKChannel> channels; // channels of a trace
LTKChannel xChannel("X", DT_FLOAT, true); // x-coordinate channel of the trace
LTKChannel yChannel("Y", DT_FLOAT, true); // y-coordinate channel of the trace
//initializing the channels of the trace
channels.push_back(xChannel);
channels.push_back(yChannel);
// composing the trace format object
LTKTraceFormat traceFormat(channels);
vector<float> point; // a point of a trace
LTKTrace trace(traceFormat);
for(int count=0;count<(int)shapeFeature.size();count++)
{
float Xpoint, Ypoint;
bool penUp;
NPenShapeFeature* ptr = (NPenShapeFeature*)(shapeFeature[count].operator ->());
Xpoint = ptr->getX();
Ypoint = ptr->getY();
penUp = ptr->isPenUp();
point.push_back(Xpoint);
point.push_back(Ypoint);
trace.addPoint(point);
point.clear();
if(penUp == true) // end of a trace, clearing the trace now
{
outTraceGroup.addTrace(trace);
trace.emptyTrace();
LTKTrace tempTrace(traceFormat);
trace = tempTrace;
}
}
LOG(LTKLogger::LTK_LOGLEVEL_DEBUG) << "Exiting " <<
"NPenShapeFeatureExtractor::convertFeatVecToTraceGroup()" << endl;
return SUCCESS;
}
int NPenShapeFeature::getDistance(const LTKShapeFeaturePtr& shapeFeaturePtr, float& outDistance) const
{
outDistance = 0.0;
NPenShapeFeature *inFeature = (NPenShapeFeature*)(shapeFeaturePtr.operator ->());
outDistance += (m_x - inFeature->getX())*(m_x - inFeature->getX());
outDistance += (m_y - inFeature->getY())*(m_y - inFeature->getY());
outDistance += (m_cosAlpha - inFeature->getCosAlpha())*(m_cosAlpha - inFeature->getCosAlpha());
outDistance += (m_sinAlpha - inFeature->getSinAlpha())*(m_sinAlpha - inFeature->getSinAlpha());
outDistance += (m_cosBeta - inFeature->getCosBeta())*(m_cosBeta - inFeature->getCosBeta());
outDistance += (m_sinBeta - inFeature->getSinBeta())*(m_sinBeta - inFeature->getSinBeta());
outDistance += (m_aspect - inFeature->getAspect())*(m_aspect - inFeature->getAspect());
outDistance += (m_curliness - inFeature->getCurliness())*(m_curliness - inFeature->getCurliness());
outDistance += (m_linearity - inFeature->getLinearity())*(m_linearity - inFeature->getLinearity());
outDistance += (m_slope - inFeature->getSlope())*(m_slope - inFeature->getSlope());
return SUCCESS;
}
LTKShapeFeaturePtr NPenShapeFeature::clone() const
{
NPenShapeFeature* npenSF = new NPenShapeFeature();
npenSF->setX(this->getX());
npenSF->setY(this->getY());
npenSF->setCosAlpha(this->getCosAlpha());
npenSF->setSinAlpha(this->getSinAlpha());
npenSF->setCosBeta(this->getCosBeta());
npenSF->setSinBeta(this->getSinBeta());
npenSF->setAspect(this->getAspect());
npenSF->setCurliness(this->getCurliness());
npenSF->setLinearity(this->getLinearity());
npenSF->setSlope(this->getSlope());
npenSF->setPenUp(this->isPenUp());
return (LTKShapeFeaturePtr)npenSF;
}
/**********************************************************************************
* AUTHOR : Bharath A
* DATE : 12-Jun-2008
* NAME : extractFeatures
* DESCRIPTION : Extracts NPen features from a trace group
* ARGUMENTS : The trace group from which features have to be extracted
* RETURNS : vector of NPenShapeFeature objects
* NOTES :
* CHANGE HISTROY
* Author Date Description of change
*************************************************************************************/
int NPenShapeFeatureExtractor::extractFeatures(const LTKTraceGroup& inTraceGroup,
vector<LTKShapeFeaturePtr>& outFeatureVec)
{
LOG(LTKLogger::LTK_LOGLEVEL_DEBUG) << "Entering " <<
"NPenShapeFeatureExtractor::extractFeatures()" << endl;
NPenShapeFeature* featurePtr = NULL;
vector<vector<float> > floatFeatureValues;
int errorCode;
if(inTraceGroup.getNumTraces() == 0)
{
LOG(LTKLogger::LTK_LOGLEVEL_ERR)
<<"Error: FeatureExtractor::findAllFeatures"<<endl;
LTKReturnError(EEMPTY_TRACE_GROUP);
}
vector<vector<float> > concatenatedCoord;
int currPenUpPointIndex = -1;
vector<int> penUpPointsIndices;
int halfWindowSize = m_windowSize/2;
if(halfWindowSize==0)
{
LOG(LTKLogger::LTK_LOGLEVEL_ERR)
<<"Error: FeatureExtractor::findAllFeatures"<<endl;
LTKReturnError(EINVALID_NUM_OF_POINTS);
}
for(int t=0;t<inTraceGroup.getNumTraces();++t)
{
LTKTrace eachTrace;
inTraceGroup.getTraceAt(t,eachTrace);
if(eachTrace.isEmpty())
{
LOG(LTKLogger::LTK_LOGLEVEL_ERR)
<<"Error: FeatureExtractor::findAllFeatures"<<endl;
LTKReturnError(EEMPTY_TRACE);
}
vector<float> xVec;
vector<float> yVec;
eachTrace.getChannelValues(X_CHANNEL_NAME,xVec);
eachTrace.getChannelValues(Y_CHANNEL_NAME,yVec);
if(t==0)
{
vector<float> firstPoint;
firstPoint.push_back(xVec[0]);
firstPoint.push_back(yVec[0]);
concatenatedCoord.insert(concatenatedCoord.begin(),halfWindowSize,firstPoint);
}
for(int p=0;p<xVec.size();++p)
{
vector<float> point;
point.push_back(xVec[p]);
point.push_back(yVec[p]);
concatenatedCoord.push_back(point);
}
currPenUpPointIndex += xVec.size();
penUpPointsIndices.push_back(currPenUpPointIndex);
if(t==(inTraceGroup.getNumTraces()-1))
{
vector<float> lastPoint;
lastPoint.push_back(xVec[xVec.size()-1]);
lastPoint.push_back(yVec[yVec.size()-1]);
concatenatedCoord.insert(concatenatedCoord.end(),halfWindowSize,lastPoint);
}
}
/* 0 - normalized x
1 - normalized y
2 - cos alpha
3 - sin alpha
4 - cos beta
5 - sin beta
6 - aspect
7 - curliness
8 - linearity
9 - slope
10 - pen-up / pen-down stroke (0 for pen-down and 1 for pen-up)*/
float deltaX=0;
float deltaY=0;
float hypotenuse=0;
float cosalpha=0;
float sinalpha=0;
float cosbeta=0;
float sinbeta=0;
float ispenup=0;
float aspect=0;
float curliness=0;
float linearity=0;
float slope=0;
float xMin,yMin,xMax,yMax; //for vicnity bounding box;
float bbWidth,bbHeight;
float maxOfWidthHeight;
currPenUpPointIndex = 0;
for(int f=halfWindowSize;f<(concatenatedCoord.size()-halfWindowSize);++f)
{
vector<float> eachPointFeature;
eachPointFeature.push_back(concatenatedCoord[f][0]); //x
eachPointFeature.push_back(concatenatedCoord[f][1]); //y
deltaX = concatenatedCoord[f-1][0] - concatenatedCoord[f+1][0];
deltaY = concatenatedCoord[f-1][1] - concatenatedCoord[f+1][1];
hypotenuse = sqrt((deltaX*deltaX)+(deltaY*deltaY));
if(hypotenuse < EPS)
{
cosalpha = 1;
sinalpha = 0;
}
else
{
cosalpha = deltaX / hypotenuse;
sinalpha = deltaY / hypotenuse;
}
eachPointFeature.push_back(cosalpha);
eachPointFeature.push_back(sinalpha);
eachPointFeature.push_back(cosbeta); //creating empty spaces for cosine and sine betas for future assignment
eachPointFeature.push_back(sinbeta);
vector<vector<float> > vicinity;
float vicinityTrajLen = 0.0f;
for(int v=f-halfWindowSize;v<=f+halfWindowSize;++v)
{
vicinity.push_back(concatenatedCoord[v]);
if(v<(f+halfWindowSize))
{
vicinityTrajLen += (sqrt(((concatenatedCoord[v+1][1]-concatenatedCoord[v][1])*(concatenatedCoord[v+1][1]-concatenatedCoord[v][1]))+((concatenatedCoord[v+1][0]-concatenatedCoord[v][0])*(concatenatedCoord[v+1][0]-concatenatedCoord[v][0]))));
}
}
findVicinityBoundingBox(vicinity,xMin,yMin,xMax,yMax);
bbWidth = xMax - xMin;
bbHeight = yMax - yMin;
if(fabs(bbHeight+bbWidth)<EPS)
{
aspect = 0.0;
}
else
{
aspect = (bbHeight-bbWidth)/(bbHeight+bbWidth);
}
eachPointFeature.push_back(aspect);
maxOfWidthHeight = ( bbWidth > bbHeight) ? bbWidth : bbHeight;
if(fabs(maxOfWidthHeight) < EPS)
{
curliness = 0.0f;
}
else
{
curliness = (vicinityTrajLen / maxOfWidthHeight) - 2;
}
eachPointFeature.push_back(curliness);
computeLinearityAndSlope(vicinity,linearity,slope);
eachPointFeature.push_back(linearity);
eachPointFeature.push_back(slope);
if(penUpPointsIndices[currPenUpPointIndex] == (f-halfWindowSize))
{
ispenup = 1;
++currPenUpPointIndex;
}
else
{
ispenup = 0;
}
eachPointFeature.push_back(ispenup); //currently assuming pen-up strokes are not resampled
floatFeatureValues.push_back(eachPointFeature);
}
//duplicating first and last features
vector<float> firstFeaturePoint = floatFeatureValues[0];
floatFeatureValues.insert(floatFeatureValues.begin(),1,firstFeaturePoint);
vector<float> lastFeaturePoint = floatFeatureValues[floatFeatureValues.size()-1];
floatFeatureValues.insert(floatFeatureValues.end(),1,lastFeaturePoint);
for(int ff=1;ff<(floatFeatureValues.size()-1);++ff)
{
floatFeatureValues[ff][4] = (floatFeatureValues[ff-1][2]*floatFeatureValues[ff+1][2]) + (floatFeatureValues[ff-1][3]*floatFeatureValues[ff+1][3]);
floatFeatureValues[ff][5] = (floatFeatureValues[ff-1][2]*floatFeatureValues[ff+1][3]) - (floatFeatureValues[ff-1][3]*floatFeatureValues[ff+1][2]);
}
//removing the extraneous feature points at the beginning and end
floatFeatureValues.erase(floatFeatureValues.begin(),floatFeatureValues.begin()+1);
floatFeatureValues.pop_back();
for(int a=0;a<floatFeatureValues.size();++a)
{
NPenShapeFeature* ptrFeature = new NPenShapeFeature();
ptrFeature->setX(floatFeatureValues[a][0]);
ptrFeature->setY(floatFeatureValues[a][1]);
ptrFeature->setCosAlpha(floatFeatureValues[a][2]);
ptrFeature->setSinAlpha(floatFeatureValues[a][3]);
ptrFeature->setCosBeta(floatFeatureValues[a][4]);
ptrFeature->setSinBeta(floatFeatureValues[a][5]);
ptrFeature->setAspect(floatFeatureValues[a][6]);
ptrFeature->setCurliness(floatFeatureValues[a][7]);
ptrFeature->setLinearity(floatFeatureValues[a][8]);
ptrFeature->setSlope(floatFeatureValues[a][9]);
if(fabs(floatFeatureValues[a][10]-1.0f) < EPS)
{
ptrFeature->setPenUp(true);
}
else
{
ptrFeature->setPenUp(false);
}
outFeatureVec.push_back(LTKShapeFeaturePtr(ptrFeature));
ptrFeature = NULL;
}
LOG(LTKLogger::LTK_LOGLEVEL_DEBUG) << "Exiting " <<
"NPenShapeFeatureExtractor::extractFeatures()" << endl;
return SUCCESS;
}