public void DCT_Insertion_Test()
{
var bmap = new Bitmap(inputImagePath);
double[] pixelArray = getPixelArray(bmap);
IDCT dct = DCT.CreateParallelDCT();
double[] forward = dct.Forward(pixelArray);
double[] signal = Enumerable.Repeat(0d, 5000).ToArray();
signal[3000] = 750;
var insert_point = 30000;
var fSignal = dct.Forward(signal);
for (int i = insert_point; i < insert_point + fSignal.Length; i++)
{
forward[i] += fSignal[i - insert_point];
}
var output = setPixelMatrix(bmap, dct.Backward(forward));
output.Save(outputImagePath);
}
public void DCT_Back_Fort_Test()
{
var bmap = new Bitmap(inputImagePath);
double[] pixelArray = getPixelArray(bmap);
IDCT dct = DCT.CreateParallelDCT();
var output = setPixelMatrix(bmap, dct.Backward(dct.Forward(pixelArray)));
output.Save(outputImagePath);
}
public void DCT_detection_Test()
{
var bmap = new Bitmap(inputImagePath);
double[] pixelArray = getPixelArray(bmap);
IDCT dct = DCT.CreateParallelDCT();
double[] forward = dct.Forward(pixelArray);
const int signalSize = 5000;
double[] signal = Enumerable.Repeat(0d, signalSize).ToArray();
signal[3000] = 750;
var insert_point = 30000;
var fSignal = dct.Forward(signal);
for (int i = insert_point; i < insert_point + fSignal.Length; i++)
{
forward[i] += fSignal[i - insert_point];
}
var output = setPixelMatrix(bmap, dct.Backward(forward));
output.Save(outputImagePath);
var bmapMarked = new Bitmap(outputImagePath);
var forwardedMarked = dct.Forward(getPixelArray(bmapMarked));
double[] extractedSignal = Enumerable.Repeat(0d, signalSize).ToArray();
for (int i = insert_point; i < insert_point + fSignal.Length; i++)
{
extractedSignal[i - insert_point] = Math.Abs(forward[i] - forwardedMarked[i]);
}
var bacwardextractedSignal = dct.Backward(extractedSignal);
var mean = bacwardextractedSignal.Sum() / bacwardextractedSignal.Length;
Console.WriteLine(mean);
}