/// <summary>
/// Create a 1 dimensional Gaussian kernel using the Gaussian G(x) function
/// </summary>
/// <returns>The <see cref="DenseMatrix{T}"/></returns>
private DenseMatrix <float> CreateGaussianKernel()
{
int size = this.kernelSize;
float weight = this.Sigma;
var kernel = new DenseMatrix <float>(size, 1);
float sum = 0F;
float midpoint = (size - 1) / 2F;
for (int i = 0; i < size; i++)
{
float x = i - midpoint;
float gx = ImageMaths.Gaussian(x, weight);
sum += gx;
kernel[0, i] = gx;
}
// Normalize kernel so that the sum of all weights equals 1
for (int i = 0; i < size; i++)
{
kernel[0, i] /= sum;
}
return(kernel);
}
/// <summary>
/// Create a 1 dimensional Gaussian kernel using the Gaussian G(x) function
/// </summary>
/// <param name="horizontal">Whether to calculate a horizontal kernel.</param>
/// <returns>The <see cref="T:float[][]"/></returns>
private float[][] CreateGaussianKernel(bool horizontal)
{
int size = this.kernelSize;
float weight = this.sigma;
float[][] kernel = horizontal ? new float[1][] : new float[size][];
if (horizontal)
{
kernel[0] = new float[size];
}
float sum = 0.0f;
float midpoint = (size - 1) / 2f;
for (int i = 0; i < size; i++)
{
float x = i - midpoint;
float gx = ImageMaths.Gaussian(x, weight);
sum += gx;
if (horizontal)
{
kernel[0][i] = gx;
}
else
{
kernel[i] = new[] { gx };
}
}
// Normalise kernel so that the sum of all weights equals 1
if (horizontal)
{
for (int i = 0; i < size; i++)
{
kernel[0][i] = kernel[0][i] / sum;
}
}
else
{
for (int i = 0; i < size; i++)
{
kernel[i][0] = kernel[i][0] / sum;
}
}
return(kernel);
}
/// <summary>
/// Create a 1 dimensional Gaussian kernel using the Gaussian G(x) function
/// </summary>
/// <param name="horizontal">Whether to calculate a horizontal kernel.</param>
/// <returns>The <see cref="Fast2DArray{T}"/></returns>
private Fast2DArray <float> CreateGaussianKernel(bool horizontal)
{
int size = this.kernelSize;
float weight = this.sigma;
Fast2DArray <float> kernel = horizontal
? new Fast2DArray <float>(size, 1)
: new Fast2DArray <float>(1, size);
float sum = 0F;
float midpoint = (size - 1) / 2F;
for (int i = 0; i < size; i++)
{
float x = i - midpoint;
float gx = ImageMaths.Gaussian(x, weight);
sum += gx;
if (horizontal)
{
kernel[0, i] = gx;
}
else
{
kernel[i, 0] = gx;
}
}
// Normalize kernel so that the sum of all weights equals 1
if (horizontal)
{
for (int i = 0; i < size; i++)
{
kernel[0, i] = kernel[0, i] / sum;
}
}
else
{
for (int i = 0; i < size; i++)
{
kernel[i, 0] = kernel[i, 0] / sum;
}
}
return(kernel);
}
/// <summary>
/// Create a 1 dimensional Gaussian kernel using the Gaussian G(x) function
/// </summary>
/// <returns>The <see cref="DenseMatrix{T}"/></returns>
private DenseMatrix <float> CreateGaussianKernel()
{
int size = this.kernelSize;
float weight = this.Sigma;
var kernel = new DenseMatrix <float>(size, 1);
float sum = 0;
float midpoint = (size - 1) / 2F;
for (int i = 0; i < size; i++)
{
float x = i - midpoint;
float gx = ImageMaths.Gaussian(x, weight);
sum += gx;
kernel[0, i] = gx;
}
// Invert the kernel for sharpening.
int midpointRounded = (int)midpoint;
for (int i = 0; i < size; i++)
{
if (i == midpointRounded)
{
// Calculate central value
kernel[0, i] = (2F * sum) - kernel[0, i];
}
else
{
// invert value
kernel[0, i] = -kernel[0, i];
}
}
// Normalize kernel so that the sum of all weights equals 1
for (int i = 0; i < size; i++)
{
kernel[0, i] /= sum;
}
return(kernel);
}
/// <summary>
/// Create a 1 dimensional Gaussian kernel using the Gaussian G(x) function.
/// </summary>
/// <returns>The <see cref="DenseMatrix{T}"/>.</returns>
internal static DenseMatrix <float> CreateGaussianBlurKernel(int size, float weight)
{
var kernel = new DenseMatrix <float>(size, 1);
float sum = 0F;
float midpoint = (size - 1) / 2F;
for (int i = 0; i < size; i++)
{
float x = i - midpoint;
float gx = ImageMaths.Gaussian(x, weight);
sum += gx;
kernel[0, i] = gx;
}
// Normalize kernel so that the sum of all weights equals 1
for (int i = 0; i < size; i++)
{
kernel[0, i] /= sum;
}
return(kernel);
}
/// <summary>
/// Create a 1 dimensional Gaussian kernel using the Gaussian G(x) function
/// </summary>
/// <param name="horizontal">Whether to calculate a horizontal kernel.</param>
/// <returns>The <see cref="Fast2DArray{T}"/></returns>
private Fast2DArray <float> CreateGaussianKernel(bool horizontal)
{
int size = this.kernelSize;
float weight = this.sigma;
Fast2DArray <float> kernel = horizontal
? new Fast2DArray <float>(size, 1)
: new Fast2DArray <float>(1, size);
float sum = 0;
float midpoint = (size - 1) / 2f;
for (int i = 0; i < size; i++)
{
float x = i - midpoint;
float gx = ImageMaths.Gaussian(x, weight);
sum += gx;
if (horizontal)
{
kernel[0, i] = gx;
}
else
{
kernel[i, 0] = gx;
}
}
// Invert the kernel for sharpening.
int midpointRounded = (int)midpoint;
if (horizontal)
{
for (int i = 0; i < size; i++)
{
if (i == midpointRounded)
{
// Calculate central value
kernel[0, i] = (2F * sum) - kernel[0, i];
}
else
{
// invert value
kernel[0, i] = -kernel[0, i];
}
}
}
else
{
for (int i = 0; i < size; i++)
{
if (i == midpointRounded)
{
// Calculate central value
kernel[i, 0] = (2 * sum) - kernel[i, 0];
}
else
{
// invert value
kernel[i, 0] = -kernel[i, 0];
}
}
}
// Normalise kernel so that the sum of all weights equals 1
if (horizontal)
{
for (int i = 0; i < size; i++)
{
kernel[0, i] = kernel[0, i] / sum;
}
}
else
{
for (int i = 0; i < size; i++)
{
kernel[i, 0] = kernel[i, 0] / sum;
}
}
return(kernel);
}
/// <summary>
/// Create a 1 dimensional Gaussian kernel using the Gaussian G(x) function
/// </summary>
/// <param name="horizontal">Whether to calculate a horizontal kernel.</param>
/// <returns>The <see cref="T:float[][]"/></returns>
private float[][] CreateGaussianKernel(bool horizontal)
{
int size = this.kernelSize;
float weight = this.sigma;
float[][] kernel = horizontal ? new float[1][] : new float[size][];
if (horizontal)
{
kernel[0] = new float[size];
}
float sum = 0;
float midpoint = (size - 1) / 2f;
for (int i = 0; i < size; i++)
{
float x = i - midpoint;
float gx = ImageMaths.Gaussian(x, weight);
sum += gx;
if (horizontal)
{
kernel[0][i] = gx;
}
else
{
kernel[i] = new[] { gx };
}
}
// Invert the kernel for sharpening.
int midpointRounded = (int)midpoint;
if (horizontal)
{
for (int i = 0; i < size; i++)
{
if (i == midpointRounded)
{
// Calculate central value
kernel[0][i] = (2f * sum) - kernel[0][i];
}
else
{
// invert value
kernel[0][i] = -kernel[0][i];
}
}
}
else
{
for (int i = 0; i < size; i++)
{
if (i == midpointRounded)
{
// Calculate central value
kernel[i][0] = (2 * sum) - kernel[i][0];
}
else
{
// invert value
kernel[i][0] = -kernel[i][0];
}
}
}
// Normalise kernel so that the sum of all weights equals 1
if (horizontal)
{
for (int i = 0; i < size; i++)
{
kernel[0][i] = kernel[0][i] / sum;
}
}
else
{
for (int i = 0; i < size; i++)
{
kernel[i][0] = kernel[i][0] / sum;
}
}
return(kernel);
}
