/// <summary>
/// See <see cref="IColorQuantizer.Prepare"/> for more details.
/// </summary>
public void Prepare(ImageBuffer image)
{
OnPrepare(image);
}
/// <summary>
/// See <see cref="BaseColorQuantizer.OnPrepare"/> for more details.
/// </summary>
protected override void OnPrepare(ImageBuffer image)
{
// creates all the cubes
cubes = new WuColorCube[MaxColor];
// initializes all the cubes
for (Int32 cubeIndex = 0; cubeIndex < MaxColor; cubeIndex++)
{
cubes[cubeIndex] = new WuColorCube();
}
// resets the reference minimums
cubes[0].RedMinimum = 0;
cubes[0].GreenMinimum = 0;
cubes[0].BlueMinimum = 0;
// resets the reference maximums
cubes[0].RedMaximum = MaxSideIndex;
cubes[0].GreenMaximum = MaxSideIndex;
cubes[0].BlueMaximum = MaxSideIndex;
weights = new Int64[SideSize, SideSize, SideSize];
momentsRed = new Int64[SideSize, SideSize, SideSize];
momentsGreen = new Int64[SideSize, SideSize, SideSize];
momentsBlue = new Int64[SideSize, SideSize, SideSize];
moments = new Single[SideSize, SideSize, SideSize];
table = new Int32[256];
for (Int32 tableIndex = 0; tableIndex < 256; ++tableIndex)
{
table[tableIndex] = tableIndex * tableIndex;
}
pixelIndex = 0;
imageWidth = image.Width;
imageSize = image.Width * image.Height;
quantizedPixels = new Int32[imageSize];
pixels = new Int32[imageSize];
}
/// <summary>
/// See <see cref="BaseColorQuantizer.OnPrepare"/> for more details.
/// </summary>
protected override void OnPrepare(ImageBuffer image)
{
base.OnPrepare(image);
GetColorCache().Prepare();
}
public void Quantize(ImageBuffer target, IColorQuantizer quantizer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// performs the pure quantization wihout dithering
Quantize(target, quantizer, null, colorCount, parallelTaskCount);
}
public void TransformPerPixelAdvanced(ImageBuffer target, IList<Point> path, TransformPixelAdvancedFunction transformPixelAdvancedFunction, Int32 parallelTaskCount = 4)
{
TransformPerPixelBase(target, path, transformPixelAdvancedFunction, parallelTaskCount);
}
public Double CalculateMeanError(ImageBuffer target, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(target, "target");
// initializes the error
Int64 totalError = 0;
// prepares the function
TransformPixelFunction calculateMeanError = (sourcePixel, targetPixel) =>
{
Color sourceColor = GetColorFromPixel(sourcePixel);
Color targetColor = GetColorFromPixel(targetPixel);
totalError += ColorModelHelper.GetColorEuclideanDistance(ColorModel.RedGreenBlue, sourceColor, targetColor);
return false;
};
// performs the image scan, using a chosen method
IList<Point> standardPath = new StandardPathProvider().GetPointPath(Width, Height);
TransformPerPixel(target, standardPath, calculateMeanError, parallelTaskCount);
// returns the calculates RMSD
return Math.Sqrt(totalError/(3.0*Width*Height));
}
public void ChangeFormat(ImageBuffer target, IColorQuantizer quantizer, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(target, "target");
Guard.CheckNull(quantizer, "quantizer");
// gathers some information about the target format
Boolean hasSourceAlpha = PixelFormat.HasAlpha();
Boolean hasTargetAlpha = target.PixelFormat.HasAlpha();
Boolean isTargetIndexed = target.PixelFormat.IsIndexed();
Boolean isSourceDeepColor = PixelFormat.IsDeepColor();
Boolean isTargetDeepColor = target.PixelFormat.IsDeepColor();
// step 1 to 3 - prepares the palettes
if (isTargetIndexed) SynthetizePalette(quantizer, target.PixelFormat.GetColorCount(), parallelTaskCount);
// prepares the quantization function
TransformPixelFunction changeFormat = (sourcePixel, targetPixel) =>
{
// if both source and target formats are deep color formats, copies a value directly
if (isSourceDeepColor && isTargetDeepColor)
{
//UInt64 value = sourcePixel.Value;
//targetPixel.SetValue(value);
}
else
{
// retrieves a source image color
Color color = GetColorFromPixel(sourcePixel);
// if alpha is not present in the source image, but is present in the target, make one up
if (!hasSourceAlpha && hasTargetAlpha)
{
Int32 argb = 255 << 24 | color.R << 16 | color.G << 8 | color.B;
color = Color.FromArgb(argb);
}
// sets the color to a target pixel
SetColorToPixel(targetPixel, color, quantizer);
}
// allows to write (obviously) the transformed pixel
return true;
};
// step 5 - generates the target image
IList<Point> standardPath = new StandardPathProvider().GetPointPath(Width, Height);
TransformPerPixel(target, standardPath, changeFormat, parallelTaskCount);
}
public static Double CalculateImageNormalizedMeanError(Image sourceImage, Image targetImage, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
Guard.CheckNull(targetImage, "targetImage");
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, ImageLockMode.ReadOnly))
using (ImageBuffer target = new ImageBuffer(targetImage, ImageLockMode.ReadOnly))
{
// use other override to calculate error
return source.CalculateNormalizedMeanError(target, parallelTaskCount);
}
}
public static void ChangeFormat(ImageBuffer source, PixelFormat targetFormat, IColorQuantizer quantizer, out Image targetImage, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(source, "source");
// creates a target bitmap in an appropriate format
targetImage = new Bitmap(source.Width, source.Height, targetFormat);
// wraps target image to a buffer
using (ImageBuffer target = new ImageBuffer(targetImage, ImageLockMode.WriteOnly))
{
source.ChangeFormat(target, quantizer, parallelTaskCount);
}
}
/// <summary>
/// See <see cref="IColorDitherer.Prepare"/> for more details.
/// </summary>
public void Prepare(IColorQuantizer quantizer, Int32 colorCount, ImageBuffer sourceBuffer, ImageBuffer targetBuffer)
{
SourceBuffer = sourceBuffer;
TargetBuffer = targetBuffer;
ColorCount = colorCount;
Quantizer = quantizer;
OnPrepare();
}
public static Double CalculateImageNormalizedMeanError(ImageBuffer source, ImageBuffer target, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(source, "source");
// use other override to calculate error
return source.CalculateNormalizedMeanError(target, parallelTaskCount);
}
/// <summary>
/// See <see cref="BaseColorQuantizer.OnPrepare"/> for more details.
/// </summary>
protected override void OnPrepare(ImageBuffer image)
{
base.OnPrepare(image);
OnFinish();
}
/// <summary>
/// Initializes a new instance of the <see cref="Pixel"/> struct.
/// </summary>
public Pixel(ImageBuffer parent)
{
Parent = parent;
Initialize();
}
/// <summary>
/// Called when quantizer is about to be prepared for next round.
/// </summary>
protected virtual void OnPrepare(ImageBuffer image)
{
uniqueColorIndex = -1;
paletteFound = false;
UniqueColors.Clear();
}
public static void ScanImageColors(Image sourceImage, IColorQuantizer quantizer, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, ImageLockMode.ReadOnly))
{
source.ScanColors(quantizer, parallelTaskCount);
}
}
public static void ChangeFormat(Image sourceImage, PixelFormat targetFormat, IColorQuantizer quantizer, out Image targetImage, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, ImageLockMode.ReadOnly))
{
ChangeFormat(source, targetFormat, quantizer, out targetImage, parallelTaskCount);
}
}
public static List<Color> SynthetizeImagePalette(Image sourceImage, IColorQuantizer quantizer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, ImageLockMode.ReadOnly))
{
return source.SynthetizePalette(quantizer, colorCount, parallelTaskCount);
}
}
public static void CorrectImageGamma(Image sourceImage, Single gamma, IColorQuantizer quantizer, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, ImageLockMode.ReadOnly))
{
source.CorrectGamma(gamma, quantizer, parallelTaskCount);
}
}
public Double CalculateNormalizedMeanError(ImageBuffer target, Int32 parallelTaskCount = 4)
{
return CalculateMeanError(target, parallelTaskCount) / 255.0;
}
public static void DitherImage(ImageBuffer source, ImageBuffer target, IColorDitherer ditherer, IColorQuantizer quantizer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(source, "source");
// use other override to calculate error
source.Dither(target, ditherer, quantizer, colorCount, parallelTaskCount);
}
public void Dither(ImageBuffer target, IColorDitherer ditherer, IColorQuantizer quantizer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(target, "target");
Guard.CheckNull(ditherer, "ditherer");
Guard.CheckNull(quantizer, "quantizer");
// prepares ditherer for another round
ditherer.Prepare(quantizer, colorCount, this, target);
// processes the image via the ditherer
IList<Point> path = ditherer.GetPointPath(Width, Height);
TransformPerPixel(target, path, ditherer.ProcessPixel, parallelTaskCount);
}
public static void DitherImage(Image sourceImage, Image targetImage, IColorDitherer ditherer, IColorQuantizer quantizer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
Guard.CheckNull(targetImage, "targetImage");
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, ImageLockMode.ReadOnly))
using (ImageBuffer target = new ImageBuffer(targetImage, ImageLockMode.ReadOnly))
{
// use other override to calculate error
source.Dither(target, ditherer, quantizer, colorCount, parallelTaskCount);
}
}
public void Quantize(ImageBuffer target, IColorQuantizer quantizer, IColorDitherer ditherer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(target, "target");
Guard.CheckNull(quantizer, "quantizer");
// initializes quantization parameters
Boolean isTargetIndexed = target.PixelFormat.IsIndexed();
// step 1 - prepares the palettes
List<Color> targetPalette = isTargetIndexed ? SynthetizePalette(quantizer, colorCount, parallelTaskCount) : null;
// step 2 - updates the bitmap palette
target.bitmap.SetPalette(targetPalette);
target.UpdatePalette(true);
// step 3 - prepares ditherer (optional)
if (ditherer != null) ditherer.Prepare(quantizer, colorCount, this, target);
// step 4 - prepares the quantization function
TransformPixelFunction quantize = (sourcePixel, targetPixel) =>
{
// reads the pixel color
Color color = GetColorFromPixel(sourcePixel);
// converts alpha to solid color
color = QuantizationHelper.ConvertAlpha(color);
// quantizes the pixel
SetColorToPixel(targetPixel, color, quantizer);
// marks pixel as processed by default
Boolean result = true;
// preforms inplace dithering (optional)
if (ditherer != null && ditherer.IsInplace)
{
result = ditherer.ProcessPixel(sourcePixel, targetPixel);
}
// returns the result
return result;
};
// step 5 - generates the target image
IList<Point> path = quantizer.GetPointPath(Width, Height);
TransformPerPixel(target, path, quantize, parallelTaskCount);
// step 6 - preforms non-inplace dithering (optional)
if (ditherer != null && !ditherer.IsInplace)
{
Dither(target, ditherer, quantizer, colorCount, 1);
}
// step 7 - finishes the dithering (optional)
if (ditherer != null) ditherer.Finish();
// step 8 - clean-up
quantizer.Finish();
}
public static Image QuantizeImage(ImageBuffer source, IColorQuantizer quantizer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// performs the pure quantization wihout dithering
return QuantizeImage(source, quantizer, null, colorCount, parallelTaskCount);
}
private void TransformPerPixelBase(ImageBuffer target, IList<Point> path, Delegate transformAction, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(path, "path");
Guard.CheckNull(target, "target");
Guard.CheckNull(transformAction, "transformAction");
// updates the palette
UpdatePalette();
target.UpdatePalette();
// checks the dimensions
if (Width != target.Width || Height != target.Height)
{
const String message = "Both images have to have the same dimensions.";
throw new ArgumentOutOfRangeException(message);
}
// determines mode
Boolean isAdvanced = transformAction is TransformPixelAdvancedFunction;
// process the image in a parallel manner
Action<LineTask> transformPerPixel = lineTask =>
{
// creates individual pixel structures per task
Pixel sourcePixel = new Pixel(this);
Pixel targetPixel = new Pixel(target);
// enumerates the pixels row by row
for (Int32 pathOffset = lineTask.StartOffset; pathOffset < lineTask.EndOffset; pathOffset++)
{
Point point = path[pathOffset];
Boolean allowWrite;
// enumerates the pixel, and returns the control to the outside
sourcePixel.Update(point.X, point.Y);
targetPixel.Update(point.X, point.Y);
// when read is allowed, retrieves current value (in bytes)
if (CanRead) ReadPixel(sourcePixel);
if (target.CanRead) target.ReadPixel(targetPixel);
// process the pixel by custom user operation
if (isAdvanced)
{
TransformPixelAdvancedFunction transformAdvancedFunction = (TransformPixelAdvancedFunction) transformAction;
allowWrite = transformAdvancedFunction(sourcePixel, targetPixel, this, target);
}
else // use simplified version with pixel parameters only
{
TransformPixelFunction transformFunction = (TransformPixelFunction) transformAction;
allowWrite = transformFunction(sourcePixel, targetPixel);
}
// when write is allowed, copies the value back to the row buffer
if (target.CanWrite && allowWrite) target.WritePixel(targetPixel);
}
};
// transforms image per pixel
ProcessInParallel(path, transformPerPixel, parallelTaskCount);
}
public static Image QuantizeImage(ImageBuffer source, IColorQuantizer quantizer, IColorDitherer ditherer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(source, "source");
// creates a target bitmap in an appropriate format
PixelFormat targetPixelFormat = Extend.GetFormatByColorCount(colorCount);
Image result = new Bitmap(source.Width, source.Height, targetPixelFormat);
// lock mode
ImageLockMode lockMode = ditherer == null ? ImageLockMode.WriteOnly : ImageLockMode.ReadWrite;
// wraps target image to a buffer
using (ImageBuffer target = new ImageBuffer(result, lockMode))
{
source.Quantize(target, quantizer, ditherer, colorCount, parallelTaskCount);
return result;
}
}
/// <summary>
/// See <see cref="BaseColorQuantizer.OnPrepare"/> for more details.
/// </summary>
protected override void OnPrepare(ImageBuffer image)
{
base.OnPrepare(image);
OnFinish();
network = new Int32[NetworkSize][];
uniqueColors.Clear();
// initializes all the neurons in the network
for (Int32 neuronIndex = 0; neuronIndex < NetworkSize; neuronIndex++)
{
Int32[] neuron = new Int32[4];
// calculates the base value for all the components
Int32 baseValue = (neuronIndex << (NetworkBiasShift + 8)) / NetworkSize;
neuron[0] = baseValue;
neuron[1] = baseValue;
neuron[2] = baseValue;
// determines other per neuron values
bias[neuronIndex] = 0;
network[neuronIndex] = neuron;
frequency[neuronIndex] = InitialBias / NetworkSize;
}
// initializes the some variables
alpha = InitialAlpha;
initialRadius = InitialRadius;
// determines the radius
Int32 potentialRadius = InitialRadius >> DefaultRadiusBiasShift;
radius = potentialRadius <= 1 ? 0 : potentialRadius;
Int32 radiusSquared = radius * radius;
// precalculates the powers for all the radiuses
for (Int32 index = 0; index < radius; index++)
{
Int32 indexSquared = index * index;
radiusPower[index] = alpha * (((radiusSquared - indexSquared) * RadiusBias) / radiusSquared);
}
}
public static Image QuantizeImage(Image sourceImage, IColorQuantizer quantizer, IColorDitherer ditherer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
// lock mode
ImageLockMode lockMode = ditherer == null ? ImageLockMode.ReadOnly : ImageLockMode.ReadWrite;
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, lockMode))
{
return QuantizeImage(source, quantizer, ditherer, colorCount, parallelTaskCount);
}
}
/// <summary>
/// See <see cref="BaseColorQuantizer.OnPrepare"/> for more details.
/// </summary>
protected override void OnPrepare(ImageBuffer image)
{
base.OnPrepare(image);
palette = new List<Color>();
colorMap = new ConcurrentDictionary<Int32, PopularityColorSlot>();
}
/// <summary>
/// See <see cref="BaseColorQuantizer.OnPrepare"/> for more details.
/// </summary>
protected override void OnPrepare(ImageBuffer image)
{
redSlots = new UniformColorSlot[8];
greenSlots = new UniformColorSlot[8];
blueSlots = new UniformColorSlot[4];
}
