private FlatArray2DArray <int>[] GetMidResConvolution2(PhysicalImage physicalImage)
{
int GetConvolution(IEnumerable <int> convolutionPixels, double[] filter)
{
int value = (int)convolutionPixels
.Zip(filter, (a, b) => a * b)
.Sum();
value = value < 0 ? 0 : value;
value = value > 255 ? 255 : value;
return(value);
}
FastBitmap.FastBitmap bitmap = _loader.LoadImage(physicalImage.ImagePath);
var bitmapAsIntensity = new FastBitmapToIntensity2DArrayAdapter(bitmap);
var convolution135Result =
new FlatArray2DArray <int>(new int[bitmap.Width * bitmap.Height], bitmap.Width, bitmap.Height);
var convolution45Result =
new FlatArray2DArray <int>(new int[bitmap.Width * bitmap.Height], bitmap.Width, bitmap.Height);
var convolutionHorizontalResult =
new FlatArray2DArray <int>(new int[bitmap.Width * bitmap.Height], bitmap.Width, bitmap.Height);
var convolutionVerticalResult =
new FlatArray2DArray <int>(new int[bitmap.Width * bitmap.Height], bitmap.Width, bitmap.Height);
var convolutionEdgeResult =
new FlatArray2DArray <int>(new int[bitmap.Width * bitmap.Height], bitmap.Width, bitmap.Height);
bitmap.Lock();
for (int y = 0; y < bitmap.Height; y++)
{
for (int x = 0; x < bitmap.Width; x++)
{
var convolutionPixels =
GetConvolutionPixels(bitmapAsIntensity, new Rectangle(x - 1, y - 1, 3, 3)).ToArray();
convolution135Result[x, y] = GetConvolution(convolutionPixels, StatsGenerator.MidRes135Filter);
convolution45Result[x, y] = GetConvolution(convolutionPixels, StatsGenerator.MidRes45Filter);
convolutionHorizontalResult[x, y] =
GetConvolution(convolutionPixels, StatsGenerator.MidResHorizontalFilter);
convolutionVerticalResult[x, y] = GetConvolution(convolutionPixels, StatsGenerator.MidResVerticalFilter);
convolutionEdgeResult[x, y] = GetConvolution(convolutionPixels, StatsGenerator.MidResEdgeFilter);
}
}
bitmap.Unlock();
var convolutionResults = new[]
{
convolution135Result,
convolution45Result,
convolutionHorizontalResult,
convolutionVerticalResult,
convolutionEdgeResult,
};
return(convolutionResults);
}
private FlatArray2DArray <int> Reduce(FlatArray2DArray <int> source)
{
var rect = new Rectangle(0, 0, source.Width, source.Height);
var subRects = GetReductionIdentityRectangles(rect);
var reduced = subRects
.Select(r => ApplyFilter(GetConvolutionPixels(source, r).ToArray(), ReduceIdentityFilter));
return(new FlatArray2DArray <int>(reduced, source.Width / 5, source.Height / 5));
}
