private static Image FromBlocks(ImageBlocks imageBlocks)
{
var image = new Image(imageBlocks.Width, imageBlocks.Height);
foreach (Block block in imageBlocks.Blocks)
{
switch (block.Type)
{
case BlockType.Y:
image.X.SetSubMatrix(block.Position.x, block.Position.y, block.Values);
break;
case BlockType.U:
image.Y.SetSubMatrix(block.Position.x, block.Position.y, block.Values, 2);
break;
case BlockType.V:
image.Z.SetSubMatrix(block.Position.x, block.Position.y, block.Values, 2);
break;
default:
throw new ArgumentOutOfRangeException();
}
}
return(image);
}
public Image Decode(ImageBlocks imageBlocks)
{
Image image = FromBlocks(imageBlocks);
YUVToRGB(image);
return(image);
}
private static void Main(string[] args)
{
Image image = PPM.ReadImage("nt-P6.ppm") !;
var encoder = new Encoder();
var decoder = new Decoder();
ImageBlocks imageBlocks = encoder.Encode(image);
Image decoded = decoder.Decode(imageBlocks);
PPM.WriteImage("output.ppm", decoded);
}
private static ImageBlocks ToBlocks(Image image)
{
var imageBlocks = new ImageBlocks(image.Width, image.Height);
for (var i = 0; i < image.Width; i += Block.Size)
{
for (var j = 0; j < image.Height; j += Block.Size)
{
FlatMatrix <int> y = image.X.GetSubMatrix(i, j, Block.Size, Block.Size);
FlatMatrix <int> u = image.X.GetSubMatrix(i, j, Block.Size, Block.Size, 2);
FlatMatrix <int> v = image.X.GetSubMatrix(i, j, Block.Size, Block.Size, 2);
var yBlock = new Block
{
Position = (i, j),
Type = BlockType.Y,
Values = y
};
var uBlock = new Block
{
Position = (i, j),
Type = BlockType.U,
Values = u
};
var vBlock = new Block
{
Position = (i, j),
Type = BlockType.V,
Values = v
};
imageBlocks.Blocks.Add(yBlock);
imageBlocks.Blocks.Add(uBlock);
imageBlocks.Blocks.Add(vBlock);
}
}
return(imageBlocks);
}
}
}
