private static Vector <Matrix>[,] SplitToBlocksInt(Vector <int>[,] map, int blockSize)
{
var result = new Vector <Matrix> [map.GetLength(0) / blockSize, map.GetLength(1) / blockSize];
for (var i = 0; i < map.GetLength(0); i += blockSize)
{
for (var j = 0; j < map.GetLength(1); j += blockSize)
{
var array = new Vector <double> [blockSize, blockSize];
for (var x = 0; x < blockSize; ++x)
{
for (var y = 0; y < blockSize; ++y)
{
array[x, y] = map[i + x, j + y].Convert(Convert.ToDouble);
}
}
var matrices = new Matrix[3];
for (var k = 0; k < 3; ++k)
{
matrices[k] = new Matrix(Project(array, k));
}
result[i / blockSize, j / blockSize] = new Vector <Matrix>(matrices);
}
}
return(result);
}
private static Matrix GetQuantizationMatrix(MatrixGenerators generators)
{
var result = new Matrix(8, 8);
for (var i = 0; i < 8; ++i)
{
for (var j = 0; j < 8; ++j)
{
result[i, j] = generators.Alpha * (1 + generators.Gamma * (i + j + 2));
}
}
return(result);
}
private static Matrix GetDctMatrix()
{
var result = new Matrix(8, 8);
for (var j = 0; j < 8; ++j)
{
result[0, j] = 1.0 / Math.Sqrt(8);
}
for (var i = 1; i < 8; ++i)
{
for (var j = 0; j < 8; ++j)
{
result[i, j] = 0.5 * Math.Cos((2 * j + 1) * i * Math.PI / 16.0);
}
}
return(result);
}
private static Vector <Matrix>[,] ApplyDct(Vector <Matrix>[,] blocks, Matrix dct, Matrix transposedDct)
{
var n = blocks.GetLength(0);
var m = blocks.GetLength(1);
var result = new Vector <Matrix> [n, m];
for (var i = 0; i < n; ++i)
{
for (var j = 0; j < m; ++j)
{
result[i, j] = new Vector <Matrix>(3);
for (var k = 0; k < 3; ++k)
{
result[i, j][k] = dct * blocks[i, j][k] * transposedDct;
}
}
}
return(result);
}
private static Vector <Matrix>[,] DequantizeByMatrices(Vector <Matrix>[,] appliedDct, Matrix matrixY, Matrix matrixC)
{
for (var i = 0; i < appliedDct.GetLength(0); ++i)
{
for (var j = 0; j < appliedDct.GetLength(1); ++j)
{
appliedDct[i, j][0] = appliedDct[i, j][0] % matrixY;
appliedDct[i, j][1] = appliedDct[i, j][1] % matrixC;
appliedDct[i, j][2] = appliedDct[i, j][2] % matrixC;
}
}
return(appliedDct);
}
