/// <summary>
/// Get the quality in one of the components(Y/Cb/Cr)
/// </summary>
/// <param name="valueRef">component value of reference image</param>
/// <param name="valueDis">component value of distorted image</param>
/// <returns>quality</returns>
private double GetComponentQuality(double[,] valueRef, double[,] valueDis)
{
double quality = 1;
for (int scaleLevel = 1; scaleLevel <= MaxScaleLevel; scaleLevel++)
{
if (scaleLevel != 1)
{
valueRef = Downscaler.DownscaleByFactor(valueRef, 2);
valueDis = Downscaler.DownscaleByFactor(valueDis, 2);
}
SsimParameters ssimParams = new SsimParameters(WindowWidth, WindowHeight, C1, C2, C3, Alpha[scaleLevel], Beta[scaleLevel], Gamma[scaleLevel]);
quality *= new SsimCalculator(ssimParams).CalcMeanSsim(valueRef, valueDis);
}
return(quality);
}
/// <summary>
/// Get the quality in one of the component(Y/Cb/Cr)
/// </summary>
/// <param name="valueRef">component value of reference image</param>
/// <param name="valueDis">component value of distorted image</param>
/// <returns>quality</returns>
private double GetComponentQuality(double[,] valueRef, double[,] valueDis)
{
double quality = 1;
for (int scaleLevel = 1; scaleLevel <= MaxScaleLevel; scaleLevel++)
{
if (scaleLevel != 1)
{
valueRef = Downscaler.DownscaleByFactor(valueRef, 2);
valueDis = Downscaler.DownscaleByFactor(valueDis, 2);
}
SsimParameters ssimParams = new SsimParameters(WindowWidth, WindowHeight, C1, C2, C3, Alphas[scaleLevel], Betas[scaleLevel], Gammas[scaleLevel]);
double intermediateQuality = new SsimCalculator(ssimParams).CalcMeanSsim(valueRef, valueDis);
// make sure when the image is downscaled to less then 8x8 it can get a meaningful result.
if (!Double.Equals(intermediateQuality, 0.0))
{
quality *= intermediateQuality;
}
}
return(quality);
}
