/*
* for analyzing an image, we don't want to sample every single pixel. but we
* also don't want to only sample once per tile. since conceptually each
* outer tile is supposed to cover multiple important regions, sample those
* regions and average.
*/
public int GetMapIndexOfRegion(Bitmap img, int x, int y, Size sz)
{
ColorF charRGB = ColorF.Init;
ColorF[] lumaRGB = new ColorF[LumaComponentCount];
int[] pixelCounts = new int[LumaComponentCount];
for (int i = 0; i < LumaComponentCount; ++i)
{
lumaRGB[i] = ColorF.Init;
pixelCounts[i] = 0;
}
float[] vals = new float[DimensionCount];
for (int py = 0; py < sz.Height; ++py)
{
for (int px = 0; px < sz.Width; ++px)
{
ColorF pc = ColorF.From(img.GetPixel(x + px, y + py));
charRGB = charRGB.Add(pc);
int lumaIdx = Tessellator.GetLumaTileIndexOfPixelPosInCell(px, py, sz);
lumaRGB[lumaIdx] = lumaRGB[lumaIdx].Add(pc);
pixelCounts[lumaIdx]++;
}
}
for (int i = 0; i < LumaComponentCount; ++i)
{
ColorF lc = lumaRGB[i].Div(pixelCounts[i]);
LCCColorNorm lccc = RGBToNormalizedLCC(lc);
vals[i] = (float)lccc.L;
}
if (UseChroma)
{
charRGB = charRGB.Div(Utils.Product(sz));
LCCColorNorm charLAB = RGBToNormalizedLCC(charRGB);
vals[GetValueC1Index()] = (float)charLAB.C1;
vals[GetValueC2Index()] = (float)charLAB.C2;
}
int ID = NormalizedValueSetToMapID(vals);
return(ID);
}
public int GetMapIndexOfRegion(Bitmap img, int x, int y, Size sz)
{
ColorF rgb = ColorF.Init;
LCCColorDenorm lab = LCCColorDenorm.Init;
LCCColorNorm norm = LCCColorNorm.Init;
float[] vals = new float[DimensionCount];
ColorF charRGB = ColorF.Init;
for (int ty = LumaTiles.Height - 1; ty >= 0; --ty)
{
for (int tx = LumaTiles.Width - 1; tx >= 0; --tx)
{
Point tilePos = GetTileOrigin(sz, LumaTiles, tx, ty);
// YES this just gets 1 pixel per char-sized area.
rgb = ColorF.From(img.GetPixel(x + tilePos.X, y + tilePos.Y));
lab = Colorspace.RGBToLCC(rgb);
norm = RGBToNormalizedLCC(rgb);
vals[GetValueLIndex(tx, ty)] = (float)norm.L;
charRGB = charRGB.Add(rgb);
}
}
if (UseChroma)
{
int numTiles = Utils.Product(LumaTiles);
charRGB = charRGB.Div(numTiles);
norm = RGBToNormalizedLCC(charRGB);
vals[GetValueC1Index()] = (float)norm.C1;
vals[GetValueC2Index()] = (float)norm.C2;
}
int ID = NormalizedValueSetToMapID(vals);
return(ID);
}
