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ImageSharp
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Fixed several bugs produced during parallelism implementations

pull/1574/head
Simanto Rahman 8 years ago
parent
3c64102940
commit
4b801a414c
1 changed files with 33 additions and 41 deletions
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  1. 74
      src/ImageSharp/Processing/Processors/Binarization/AdaptiveThresholdProcessor.cs

74
src/ImageSharp/Processing/Processors/Binarization/AdaptiveThresholdProcessor.cs
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@ -55,7 +55,7 @@ namespace SixLabors.ImageSharp.Processing.Processors.Binarization
this.Upper = upper;
this.Lower = lower;
this.Threshold = threshold;
this.ThresholdLimit = threshold;
}
/// <summary>
@ -71,7 +71,7 @@ namespace SixLabors.ImageSharp.Processing.Processors.Binarization
/// <summary>
/// Gets or sets the value for threshold limit
/// </summary>
public float Threshold { get; set; }
public float ThresholdLimit { get; set; }
/// <inheritdoc/>
protected override void OnFrameApply(ImageFrame<TPixel> source, Rectangle sourceRectangle, Configuration configuration)
@ -90,81 +90,73 @@ namespace SixLabors.ImageSharp.Processing.Processors.Binarization
// Using pooled 2d buffer for integer image table
using (Buffer2D<ulong> intImage = configuration.MemoryAllocator.Allocate2D<ulong>(width, height))
using (IMemoryOwner<Rgb24> tmpBuffer = configuration.MemoryAllocator.Allocate<Rgb24>(width * height))
{
var workingRectangle = Rectangle.FromLTRB(startX, startY, endX, endY);
Rectangle workingRectangle = Rectangle.FromLTRB(startX, startY, endX, endY);
ParallelHelper.IterateRowsWithTempBuffer<Rgb24>(
this.pixelOpInstance.ToRgb24(source.GetPixelSpan(), tmpBuffer.GetSpan());
ParallelHelper.IterateRows(
workingRectangle,
configuration,
(rows, memory) =>
rows =>
{
ulong sum = 0;
Span<Rgb24> tmpSpan = memory.Span;
for (int i = rows.Min; i < rows.Max; i++)
Span<Rgb24> rgbSpan = tmpBuffer.GetSpan();
uint sum;
for (int x = startX; x < endX; x++)
{
this.pixelOpInstance.ToRgb24(source.GetPixelRowSpan(i), tmpSpan);
sum = 0;
for (int j = startX; j < endX; j++)
for (int y = rows.Min; y < rows.Max; y++)
{
ref Rgb24 rgb = ref tmpSpan[j];
sum += (ulong)(rgb.R + rgb.G + rgb.B);
ref Rgb24 rgb = ref rgbSpan[(width * y) + x];
sum += (uint)(rgb.R + rgb.G + rgb.B);
if (i != 0)
if (x > 0)
{
intImage[i, j] = intImage[i - 1, j] + sum;
intImage[x - startX, y - startY] = intImage[x - 1 - startX, y - startY] + sum;
}
else
{
intImage[i, j] = sum;
intImage[x - startX, y - startY] = sum;
}
}
}
});
ParallelHelper.IterateRowsWithTempBuffer<Rgb24>(
ParallelHelper.IterateRows(
workingRectangle,
configuration,
(rows, memory) =>
rows =>
{
ushort x1, x2, y1, y2;
uint count = 0;
Span<Rgb24> rgbSpan = tmpBuffer.GetSpan();
long sum = 0;
uint count = 0;
Span<Rgb24> tmpSpan = memory.Span;
for (int i = rows.Min; i < rows.Max; i++)
for (int x = startX; x < endX; x++)
{
Span<TPixel> originalSpan = source.GetPixelRowSpan(i);
this.pixelOpInstance.ToRgb24(originalSpan, tmpSpan);
for (int j = startX; j < endX; j++)
for (int y = rows.Min; y < rows.Max; y++)
{
ref Rgb24 rgb = ref tmpSpan[j];
x1 = (ushort)Math.Max(i - clusterSize + 1, 0);
x2 = (ushort)Math.Min(i + clusterSize + 1, endY - 1);
y1 = (ushort)Math.Max(j - clusterSize + 1, 0);
y2 = (ushort)Math.Min(j + clusterSize + 1, endX - 1);
ref Rgb24 rgb = ref rgbSpan[(width * y) + x];
x1 = (ushort)Math.Max(x - clusterSize + 1 - startX, 0);
x2 = (ushort)Math.Min(x + clusterSize + 1 - startX, endX - startX - 1);
y1 = (ushort)Math.Max(y - clusterSize + 1 - startY, 0);
y2 = (ushort)Math.Min(y + clusterSize + 1 - startY, endY - startY - 1);
count = (uint)((x2 - x1) * (y2 - y1));
sum = (long)(intImage[x2, y2] - intImage[x1, y2] - intImage[x2, y1] + intImage[x1, y1]);
sum = (long)(intImage[x2, y2] - intImage[x2, y1] - intImage[x1, y2] + intImage[x1, y1]);
if ((rgb.R + rgb.G + rgb.B) * count < sum * this.Threshold)
if ((rgb.R + rgb.G + rgb.B) * count <= sum * this.ThresholdLimit)
{
originalSpan[j] = this.Lower;
source[x, y] = this.Lower;
}
else
{
originalSpan[j] = this.Upper;
source[x, y] = this.Upper;
}
}
}
}
});
}
}

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