public override byte[][] Transform(Hashtable input)
{
//reseed it
if(input == null)
return null;
rnd = new Random(Guid.NewGuid().ToString().GetHashCode());
byte[][] b = (byte[][])input["image"];
int width = (int)input["width"];
int height = (int)input["height"];
allowSawtooth = (bool)input["sawtooth"];
allowVariance = (bool)input["variance"];
allowGauss = (bool)input["gauss"];
ScaleInfo si = new ScaleInfo(b.Length, b[0].Length, width, height);
if(si.IsZooming)
{
//compute k across the entire image
int nWidth = si.ResultWidth;
int nHeight = si.ResultHeight;
//apply the original image values to the given points
float w = si.WidthScalingFactor;
float h = si.HeightScalingFactor;
float?[][] newImage = new float?[nWidth][];
float[][] displacementTable = new float[nWidth][];
float[][] imageF = ToFloatTable(b);
byte[][] resultant = new byte[si.ResultWidth][];
for(int i = 0; i < nWidth; i++)
{
newImage[i] = new float?[nHeight];
displacementTable[i] = new float[nHeight];
resultant[i] = new byte[nHeight];
}
for(int i = 0; i < nWidth - 1; i++)
{
int x0 = (int)((float)i / w);
int x1 = (int)((float)(i + 1) / w);
float p0 = (float)Math.Pow(x0 - x1, 2.0f);
float[] line0 = imageF[x0];
float[] line1 = imageF[x1];
for(int j = 0; j < nHeight - 1; j++)
{
int y0 = (int)((float)j / h);
int y1 = (int)((float)(j + 1) / h);
//order has been messed up for sometime
//should go (x0,y0), (x0,y1), (x1,y1), (x1,y0)
float f0 = line0[y0];
float f1 = line0[y1];
float f2 = line1[y1];
float f3 = line1[y0];
k = ComputeK(2,i,j,b);
displacementTable[i][j] = k; //save the base value
//if(k < 1.0f)
//{
float gauss = !allowGauss ? (float)rnd.NextDouble() : 1.0f;
float var = !allowVariance ? Variance(f0,f1,f2,f3) : 1.0f;
float tmp = (float)Math.Sqrt(1.0f - (float)Math.Pow(2.0f, 2.0f * k - 2f)) *
DeltaX(p0,y0,y1) * gauss * var;
k = tmp;
//}
DivideGrid(resultant, newImage, i, j, w, h, f0, f1, f2, f3);
}
}
if(allowSawtooth)
{
List<float> temp = new List<float>();
for(int x = 0; x < si.ResultWidth; x++)
{
int outCount = 0;
int pX = x - 1;
bool pXValid = (pX >=0);
if(pXValid)
outCount++;
int fX = x + 1;
bool fXValid = (fX < si.ResultWidth);
if(fXValid)
outCount++;
for(int y = 0; y < si.ResultHeight; y++)
{
if(newImage[x][y] == null || newImage[x][y] > 1.0f)
{
temp.Clear();
int pY = y - 1;
int fY = y + 1;
int count = outCount;
float v0 = 0f, v1 = 0f, v2 = 0f, v3 = 0f;
//f-type computation
if(pXValid)
{
v0 = ((float)newImage[pX][y]);
temp.Add(v0);
}
if(pY >= 0)
{
v1 = ((float)newImage[x][pY]);
temp.Add(v1);
count++;
}
if(fXValid)
{
v2 = ((float)newImage[fX][y]);
temp.Add(v2);
}
if(fY < si.ResultHeight)
{
v3 = ((float)newImage[x][fY]);
temp.Add(v3);
count++;
}
//if count == 0 then we have bigger problems
float total = (1.0f / (float)count);
float p0 = total * (v0 + v1 + v2 + v3);
float gauss = !allowGauss ? (float)rnd.NextDouble() : 1.0f;
//get the k value
float dX = DeltaX(pX,fX,pY,fY);
float cK = displacementTable[x][y];
float var = !allowVariance ? Variance(temp.ToArray()) : 1.0f;
float p1 = (float)Math.Pow(2.0f, -(cK / 2.0f));
float p2 = (float)Math.Sqrt(1.0f - (float)Math.Pow(2.0, 2.0f * cK - 2.0f));
float result = 255.0f * Normalize(p0 + p1 * p2 * dX * gauss * var);
resultant[x][y] = (byte)result;
}
}
}
temp = null;
}
newImage = null;
displacementTable = null;
si = null;
rnd = null;
imageF = null;
return resultant;
}
else
{
ByteImage image = new ByteImage(b);
if(si.IsShrinking)
{
var _i = image.ReplicationScale(si.ResultWidth, si.ResultHeight);
byte[][] target = new byte[_i.Width][];
for(int i = 0; i < _i.Width; i++)
{
byte[] q = new byte[_i.Height];
for(int j = 0; j < _i.Height; j++)
target[i][j] = _i[i,j];
target[i] = q;
}
image = null;
return target;
}
else
return b;
}
//we create the new
}
public override byte[][] Transform(Hashtable input)
{
//DateTime start = DateTime.Now;
//reseed it
if(input == null)
return null;
byte[][] b = (byte[][])input["image"];
int width = (int)input["width"];
int height = (int)input["height"];
//allowSawtooth = (bool)input["sawtooth"];
bool allowVariance = (bool)input["variance"];
bool allowGauss = (bool)input["gauss"];
ScaleInfo si = new ScaleInfo(b.Length, b[0].Length, width, height);
if(si.IsZooming)
{
//compute k across the entire image
int nWidth = si.ResultWidth;
int nHeight = si.ResultHeight;
//apply the original image values to the given points
float w = si.WidthScalingFactor;
float h = si.HeightScalingFactor;
int w0 = (int)Math.Ceiling(w);
int h0 = (int)Math.Ceiling(h);
// int w0 = 1;
// int h0 = 1;
float?[][] newImage = new float?[nWidth][];
float[][] imageF = ToFloatTable(b);
byte[][] resultant = new byte[si.ResultWidth][];
float[][] preComputedTable = new float[nWidth][];
int[] scaleX = new int[nWidth];
int[] scaleY = new int[nHeight];
float[] xDiv = new float[nWidth - 1];
Thread t = new Thread(() => UpdateDisplacementTable(b, imageF, preComputedTable,
nWidth, nHeight, 4, allowGauss, allowVariance, w, h, scaleX, scaleY, xDiv));
for(int i = 0; i < nWidth; i++)
{
newImage[i] = new float?[nHeight];
resultant[i] = new byte[nHeight];
preComputedTable[i] = new float[nHeight];
scaleX[i] = (int)((float)i / w);
}
for(int i = 0; i < nWidth - 1; i++)
xDiv[i] = (float)Math.Pow(scaleX[i] - scaleX[i + 1], 2.0f);
for(int i = 0; i < nHeight; i++)
scaleY[i] = (int)((float)i / h);
t.Start();
for(int i = 0; i < nWidth - 3; i+=w0)
{
int x0 = scaleX[i];
int x1 = scaleX[i + 1];
float[] fx0 = imageF[x0];
float[] fx1 = imageF[x1];
float[] pctX = preComputedTable[i];
for(int j = 0; j < nHeight - 3; j+=h0)
{
int y0 = scaleY[j];
int y1 = scaleY[j + 1];
//order has been messed up for sometime
//should go (x0,y0), (x0,y1), (x1,y1), (x1,y0)
float f0 = fx0[y0];
float f1 = fx1[y0];
float f2 = fx1[y1];
float f3 = fx0[y1];
float k = pctX[j];
DivideGrid(resultant, newImage, i, j, w, h, f0, f1, f2, f3, k);
}
}
newImage = null;
si = null;
imageF = null;
//Console.WriteLine("Took {0} seconds", DateTime.Now - start);
return resultant;
}
else
{
ByteImage image = new ByteImage(b);
if(si.IsShrinking)
{
var _i = image.ReplicationScale(si.ResultWidth, si.ResultHeight);
byte[][] target = new byte[_i.Width][];
for(int i = 0; i < _i.Width; i++)
{
byte[] q = new byte[_i.Height];
for(int j = 0; j < _i.Height; j++)
target[i][j] = _i[i,j];
target[i] = q;
}
image = null;
return target;
}
else
return b;
}
}