public override void Encode(IntField image, Stream output)
{
image.ArgbTo4c();
IntField orig = image.Clone();
//image.PredictionEnTransformXor(new HorzVertForeseer());
//IntField backgr = CodecUtil.BackgroundFilterThin(image, 2, 2);
IntField backgr = CodecUtil.BackgroundFilterSmall(image, 50);
AddImageGrayscale(image, "orig");
AddImageGrayscale(backgr, "backgr");
for (int p = 0; p < image.Data.Length; p++)
{
image.Data[p] ^= backgr.Data[p];
}
AddImageGrayscale(image, "foregr");
for (int i = 1; i <= 3; i++)
{
IntField field = image.Clone();
field.Conditional(pix => pix == i);
int[] syms = CodecUtil.LzwLinesEn(field, 4, 1);
AddImageGrayscale(field, "field{0}-{1}syms-max{2}".Fmt(i, syms.Length, syms.Max()));
}
}