//--------------------------------------------------------------------------------------------------------
// function to generate mask of the pixels that move inside the image boundary
//--------------------------------------------------------------------------------------------------------
void OpticalFlow::genInImageMask(DImage &mask, const DImage &vx, const DImage &vy,int interval)
{
int imWidth,imHeight;
imWidth=vx.width();
imHeight=vx.height();
if(mask.matchDimension(vx)==false)
mask.allocate(imWidth,imHeight);
const _FlowPrecision *pVx,*pVy;
_FlowPrecision *pMask;
pVx=vx.data();
pVy=vy.data();
mask.reset();
pMask=mask.data();
double x,y;
for(int i=0;i<imHeight;i++)
for(int j=0;j<imWidth;j++)
{
int offset=i*imWidth+j;
y=i+pVx[offset];
x=j+pVy[offset];
if(x<interval || x>imWidth-1-interval || y<interval || y>imHeight-1-interval)
continue;
pMask[offset]=1;
}
}
void OpticalFlow::genInImageMask(DImage &mask, const DImage &flow,int interval)
{
int imWidth,imHeight;
imWidth=flow.width();
imHeight=flow.height();
if(mask.matchDimension(flow.width(),flow.height(),1)==false)
mask.allocate(imWidth,imHeight);
else
mask.reset();
const _FlowPrecision *pFlow;
_FlowPrecision *pMask;
pFlow = flow.data();;
pMask=mask.data();
double x,y;
for(int i=0;i<imHeight;i++)
for(int j=0;j<imWidth;j++)
{
int offset=i*imWidth+j;
y=i+pFlow[offset*2+1];
x=j+pFlow[offset*2];
if(x<interval || x>imWidth-1-interval || y<interval || y>imHeight-1-interval)
continue;
pMask[offset]=1;
}
}
void OpticalFlow::Laplacian(DImage &output, const DImage &input, const DImage& weight)
{
if(output.matchDimension(input)==false)
output.allocate(input);
output.reset();
if(input.matchDimension(weight)==false)
{
cout<<"Error in image dimension matching OpticalFlow::Laplacian()!"<<endl;
return;
}
const _FlowPrecision *inputData=input.data(),*weightData=weight.data();
int width=input.width(),height=input.height();
DImage foo(width,height);
_FlowPrecision *fooData=foo.data(),*outputData=output.data();
// horizontal filtering
for(int i=0;i<height;i++)
for(int j=0;j<width-1;j++)
{
int offset=i*width+j;
fooData[offset]=(inputData[offset+1]-inputData[offset])*weightData[offset];
}
for(int i=0;i<height;i++)
for(int j=0;j<width;j++)
{
int offset=i*width+j;
if(j<width-1)
outputData[offset]-=fooData[offset];
if(j>0)
outputData[offset]+=fooData[offset-1];
}
foo.reset();
// vertical filtering
for(int i=0;i<height-1;i++)
for(int j=0;j<width;j++)
{
int offset=i*width+j;
fooData[offset]=(inputData[offset+width]-inputData[offset])*weightData[offset];
}
for(int i=0;i<height;i++)
for(int j=0;j<width;j++)
{
int offset=i*width+j;
if(i<height-1)
outputData[offset]-=fooData[offset];
if(i>0)
outputData[offset]+=fooData[offset-width];
}
}