//---------------------------------------------------------------------------------------------
//adjust contrast
//---------------------------------------------------------------------------------------------
public void adjustContrast(classimage sourceimage, int contrastPercent, int centrepoint)
{
int x,y,c,diff,p;
int illumination;
int illumination_centre;
if (centrepoint!=0)
illumination_centre = centrepoint;
else
illumination_centre = sourceimage.getAverageIntensity(0,0,width,height);
for (x=0;x<width;x++)
for (y=0;y<height;y++)
{
illumination=0;
for (c=0;c<3;c++) illumination += sourceimage.image[x,y,c];
illumination /=3;
diff = ((illumination - illumination_centre)*contrastPercent)/100;
for (c=0;c<3;c++)
{
p = sourceimage.image[x,y,c];
p += diff;
if (p<0) p=0;
if (p>255) p=255;
image[x,y,c]=(Byte)p;
}
}
}
//---------------------------------------------------------------------------------------------
//detect blobs
//---------------------------------------------------------------------------------------------
public void filterBlobs(classimage sourceimage)
{
int x,y,c,xx,yy,av,variance,n,v;
int horizontal = sourceimage.width/6;
int vertical = horizontal;
long pixels;
if (vertical<1) vertical=1;
if (horizontal<1) horizontal=1;
pixels = horizontal*vertical;
for (x=0;x<width;x++)
{
for (y=0;y<height;y++)
{
if ((x>=horizontal) && (x<width-horizontal) && (y>=vertical) && (y<height-vertical))
{
av = sourceimage.getAverageIntensity(x-horizontal,y-vertical,x+horizontal,y+vertical);
variance=0;
n=0;
for (xx=x-horizontal;xx<x+horizontal;xx++)
{
for (yy=y-vertical;yy<y+vertical;yy++)
{
v=0;
for (c=0;c<3;c++) v+=sourceimage.image[xx,yy,c];
variance += Math.Abs((v/3) - av);
n++;
}
}
variance = 255 - (variance*4 / n);
if (variance<0) variance=0;
variance = 255 - variance;
for (c=0;c<3;c++) image[x,y,c] = (Byte)variance;
}
else for (c=0;c<3;c++) image[x,y,c] = 0;
}
}
}
