private void CreateYCbCrLayout()
{
Hide4Elements();
label1.Text = "Y";
label2.Text = "Cb";
label3.Text = "Cr";
YCbCr YCbCrColor = new YCbCr(current_color);
setting_tb_and_nup = true;
numericUpDown1.Maximum = 1;
numericUpDown2.Maximum = 1;
numericUpDown3.Maximum = 1;
numericUpDown1.Minimum = 0;
numericUpDown2.Minimum = 0;
numericUpDown3.Minimum = 0;
numericUpDown1.Increment = new decimal(0.01);
numericUpDown2.Increment = new decimal(0.01);
numericUpDown3.Increment = new decimal(0.01);
trackBar1.Value = (int)(255 * YCbCrColor.Y);
trackBar2.Value = (int)(255 * YCbCrColor.Cb);
trackBar3.Value = (int)(255 * YCbCrColor.Cr);
numericUpDown1.Value = (decimal)YCbCrColor.Y;
numericUpDown2.Value = (decimal)YCbCrColor.Cb;
numericUpDown3.Value = (decimal)YCbCrColor.Cr;
setting_tb_and_nup = false;
SetDecimalPlaces(3);
SetYCbCrLabels();
}
public ColorClose(Pixel key, int tola, int tolb)
{
_key = key.YCbCr();
_tola = tola;
_tolb = tolb;
_tolba = _tolb - _tola;
}
public void Convert_YCbCr_to_CieXyz(float y2, float cb, float cr, float x, float y, float z)
{
// Arrange
var input = new YCbCr(y2, cb, cr);
var expected = new CieXyz(x, y, z);
Span <YCbCr> inputSpan = new YCbCr[5];
inputSpan.Fill(input);
Span <CieXyz> actualSpan = new CieXyz[5];
// Act
var actual = Converter.ToCieXyz(input);
Converter.Convert(inputSpan, actualSpan, actualSpan.Length);
// Assert
Assert.Equal(expected, actual, ColorSpaceComparer);
for (int i = 0; i < actualSpan.Length; i++)
{
Assert.Equal(expected, actualSpan[i], ColorSpaceComparer);
}
}
public void Convert_CieLab_to_YCbCr(float l, float a, float b, float y, float cb, float cr)
{
// Arrange
var input = new CieLab(l, a, b);
var expected = new YCbCr(y, cb, cr);
Span <CieLab> inputSpan = new CieLab[5];
inputSpan.Fill(input);
Span <YCbCr> actualSpan = new YCbCr[5];
// Act
var actual = Converter.ToYCbCr(input);
Converter.Convert(inputSpan, actualSpan);
// Assert
Assert.Equal(expected, actual, ColorSpaceComparer);
for (int i = 0; i < actualSpan.Length; i++)
{
Assert.Equal(expected, actualSpan[i], ColorSpaceComparer);
}
}
public void Convert_Rgb_To_YCbCr(float r, float g, float b, float y, float cb, float cr)
{
// Arrange
var input = new Rgb(r, g, b);
var expected = new YCbCr(y, cb, cr);
Span <Rgb> inputSpan = new Rgb[5];
inputSpan.Fill(input);
Span <YCbCr> actualSpan = new YCbCr[5];
// Act
var actual = Converter.ToYCbCr(input);
Converter.Convert(inputSpan, actualSpan, actualSpan.Length);
// Assert
Assert.Equal(expected, actual, ColorSpaceComparer);
for (int i = 0; i < actualSpan.Length; i++)
{
Assert.Equal(expected, actualSpan[i], ColorSpaceComparer);
}
}
public void Convert_Cmyk_to_YCbCr(float c, float m, float y, float k, float y2, float cb, float cr)
{
// Arrange
var input = new Cmyk(c, m, y, k);
var expected = new YCbCr(y2, cb, cr);
Span <Cmyk> inputSpan = new Cmyk[5];
inputSpan.Fill(input);
Span <YCbCr> actualSpan = new YCbCr[5];
// Act
var actual = Converter.ToYCbCr(input);
Converter.Convert(inputSpan, actualSpan, actualSpan.Length);
// Assert
Assert.Equal(expected, actual, ColorSpaceComparer);
for (int i = 0; i < actualSpan.Length; i++)
{
Assert.Equal(expected, actualSpan[i], ColorSpaceComparer);
}
}
/// <summary>
/// Convert from RGB to YCbCr color space (Rec 601-1 specification).
/// </summary>
///
/// <param name="rgb">Source color in <b>RGB</b> color space.</param>
///
/// <returns>Returns <see cref="YCbCr"/> instance, which represents converted color value.</returns>
///
public static YCbCr FromRGB(RGB rgb)
{
YCbCr ycbcr = new YCbCr();
FromRGB(rgb, ycbcr);
return(ycbcr);
}
/// <summary>
/// Apply filter.
/// </summary>
/// <param name="bmData">Bitmap</param>
public unsafe void Apply(BitmapData bmData)
{
byte *p = (byte *)bmData.Scan0.ToPointer();
int width = bmData.Width, height = bmData.Height, stride = bmData.Stride;
Parallel.For(0, height, j =>
{
YCbCr ycbcr; RGB rgb;
int i, k, jstride = j * stride;
for (i = 0; i < width; i++)
{
k = jstride + i * 4;
ycbcr = YCbCr.FromRGB(p[k + 2], p[k + 1], p[k + 0]);
ycbcr.Y += y;
ycbcr.Cb += cb;
ycbcr.Cr += cr;
rgb = ycbcr.ToRGB;
p[k + 0] = rgb.Blue;
p[k + 1] = rgb.Green;
p[k + 2] = rgb.Red;
}
}
);
return;
}
public void Convert_YCbCr_to_CieLuv(float y, float cb, float cr, float l, float u, float v)
{
// Arrange
var input = new YCbCr(y, cb, cr);
var expected = new CieLuv(l, u, v);
Span <YCbCr> inputSpan = new YCbCr[5];
inputSpan.Fill(input);
Span <CieLuv> actualSpan = new CieLuv[5];
// Act
var actual = Converter.ToCieLuv(input);
Converter.Convert(inputSpan, actualSpan);
// Assert
Assert.Equal(expected, actual, ColorSpaceComparer);
for (int i = 0; i < actualSpan.Length; i++)
{
Assert.Equal(expected, actualSpan[i], ColorSpaceComparer);
}
}
/// <summary>
/// Converts a <see cref="YCbCr"/> into a <see cref="LinearRgb"/>
/// </summary>
/// <param name="color">The color to convert.</param>
/// <returns>The <see cref="LinearRgb"/></returns>
public LinearRgb ToLinearRgb(YCbCr color)
{
Guard.NotNull(color, nameof(color));
var rgb = this.ToRgb(color);
return(this.ToLinearRgb(rgb));
}
/// <summary>
/// Converts a <see cref="YCbCr"/> into a <see cref="Cmyk"/>
/// </summary>
/// <param name="color">The color to convert.</param>
/// <returns>The <see cref="Cmyk"/></returns>
public Cmyk ToCmyk(YCbCr color)
{
Guard.NotNull(color, nameof(color));
var rgb = this.ToRgb(color);
return(CmykAndRgbConverter.Convert(rgb));
}
public static RGB YCbCrToRGB(YCbCr ycbcr)
{
var r = Math.Max(0.0f, Math.Min(1.0f, (float)(ycbcr.Y + 0.0000 * ycbcr.Cb + 1.4022 * ycbcr.Cr)));
var g = Math.Max(0.0f, Math.Min(1.0f, (float)(ycbcr.Y - 0.3456 * ycbcr.Cb - 0.7145 * ycbcr.Cr)));
var b = Math.Max(0.0f, Math.Min(1.0f, (float)(ycbcr.Y + 1.7710 * ycbcr.Cb + 0.0000 * ycbcr.Cr)));
return(new RGB((byte)(r * 255), (byte)(g * 255), (byte)(b * 255)));
}
/// <summary>
/// Converts a <see cref="YCbCr"/> into a <see cref="Lms"/>
/// </summary>
/// <param name="color">The color to convert.</param>
/// <returns>The <see cref="Lms"/></returns>
public Lms ToLms(YCbCr color)
{
Guard.NotNull(color, nameof(color));
var xyzColor = this.ToCieXyz(color);
return(this.ToLms(xyzColor));
}
/// <summary>
/// Converts a <see cref="YCbCr"/> into a <see cref="HunterLab"/>
/// </summary>
/// <param name="color">The color to convert.</param>
/// <returns>The <see cref="HunterLab"/></returns>
public HunterLab ToHunterLab(YCbCr color)
{
Guard.NotNull(color, nameof(color));
var xyzColor = this.ToCieXyz(color);
return(this.ToHunterLab(xyzColor));
}
/// <summary>
/// Converts a <see cref="YCbCr"/> into a <see cref="Rgb"/>
/// </summary>
/// <param name="color">The color to convert.</param>
/// <returns>The <see cref="Rgb"/></returns>
public Rgb ToRgb(YCbCr color)
{
// Conversion
Rgb rgb = YCbCrAndRgbConverter.Convert(color);
// Adaptation
return(this.Adapt(rgb));
}
private void SetYCbCrLabels()
{
YCbCr yCbCrColor = new YCbCr(current_color);
label_YCbCr_Y.Text = "Y: " + yCbCrColor.Y.ToString("0.000");
label_YCbCr_Cb.Text = "Cb: " + yCbCrColor.Cb.ToString("0.000");
label_YCbCr_Cr.Text = "Cr: " + yCbCrColor.Cr.ToString("0.000");
}
/// <summary>
/// Converts a <see cref="YCbCr"/> into a <see cref="Hsl"/>
/// </summary>
/// <param name="color">The color to convert.</param>
/// <returns>The <see cref="Hsl"/></returns>
public Hsl ToHsl(YCbCr color)
{
Guard.NotNull(color, nameof(color));
var rgb = this.ToRgb(color);
return(HslAndRgbConverter.Convert(rgb));
}
/// <summary>
/// Converts a <see cref="YCbCr"/> into a <see cref="CieLchuv"/>
/// </summary>
/// <param name="color">The color to convert.</param>
/// <returns>The <see cref="CieLchuv"/></returns>
public CieLchuv ToCieLchuv(YCbCr color)
{
Guard.NotNull(color, nameof(color));
CieXyz xyzColor = this.ToCieXyz(color);
return(this.ToCieLchuv(xyzColor));
}
/// <summary>
/// Converts a <see cref="YCbCr"/> into a <see cref="CieXyz"/>
/// </summary>
/// <param name="color">The color to convert.</param>
/// <returns>The <see cref="CieXyz"/></returns>
public CieXyz ToCieXyz(YCbCr color)
{
Guard.NotNull(color, nameof(color));
// Conversion
var rgb = this.ToRgb(color);
return(this.ToCieXyz(rgb));
}
void IDCT()
{
//YCbCrBlockCollection = new YCbCrBlock[blockCount.x, blockCount.y];
for (int i = 0; i < enc.BlockCount.x; i++)
{
for (int j = 0; j < enc.BlockCount.y; j++)
{
enc.YCbCrBlockCollection[i, j].Block
= CreateYCbCrBlock(enc.FDCTBlockCollection[i, j].Block);
}
}
YCbCr[,] CreateYCbCrBlock(FDCTValue[,] block)
{
var yCbCrBlock = new YCbCr[enc.Blocksize, enc.Blocksize];
//8x8 block von dct werten
for (int x = 0; x < enc.Blocksize; x++)
{
for (int y = 0; y < enc.Blocksize; y++)
{
//einzelnen dct wert
double sum_y = 0;
double sum_cb = 0;
double sum_cr = 0;
for (int u = 0; u < 8; u++)
{
for (int v = 0; v < 8; v++)
{
double cu = u == 0 ? 1 / Math.Sqrt(2) : 1;
double cv = v == 0 ? 1 / Math.Sqrt(2) : 1;
double cos1 = Math.Cos((2 * x + 1) * (u * Math.PI) / 16);
double cos2 = Math.Cos((2 * y + 1) * (v * Math.PI) / 16);
sum_y += cu * cv * block[u, v].Y_FDCT * cos1 * cos2;
sum_cb += cu * cv * block[u, v].Cb_FDCT * cos1 * cos2;
sum_cr += cu * cv * block[u, v].Cr_FDCT * cos1 * cos2;
}
}
//einzelner ycbcr wert (Syx)
double Sxy_Y = 0.25 * sum_y;
double Sxy_Cb = 0.25 * sum_cb;
double Sxy_Cr = 0.25 * sum_cr;
yCbCrBlock[x, y].Y = Sxy_Y;
yCbCrBlock[x, y].Cb = Sxy_Cb;
yCbCrBlock[x, y].Cr = Sxy_Cr;
}
}
return(yCbCrBlock);
}
}
/// <summary>
/// Converts from their colorspace to RGB and combines all previously decoded channels
/// </summary>
/// <param name="imgInfo"></param>
/// <param name="imgS"></param>
/// <returns>A 2D array representing the color data from the image</returns>
internal static Color2[,] MergeChannels(ImgInfo imgInfo, float[][,] imgS)
{
var img = new Color2[imgInfo.height, imgInfo.width];
IColorspaceConverter converter;
if (imgInfo.app14MarkerFound)
{
switch (imgInfo.colorMode)
{
case Markers.App14ColorMode.Unknown:
converter = imgInfo.numOfComponents == 3 ? new Rgb() : (IColorspaceConverter) new YCbCr();
break;
case Markers.App14ColorMode.YCbCr:
converter = new YCbCr();
break;
case Markers.App14ColorMode.YCCK:
converter = new YCbCr();
break;
default:
converter = new Rgb();
break;
}
}
else
{
converter = new YCbCr();
}
for (int y = 0; y < imgInfo.height; y++)
{
for (int x = 0; x < imgInfo.width; x++)
{
Info info;
if (imgInfo.numOfComponents == 1) // Y
{
info.a = imgS[0][y, x];
info.b = 0;
info.c = 0;
}
else // YCbCr
{
info.a = imgS[0][y, x];
info.b = imgS[1][y, x];
info.c = imgS[2][y, x];
}
img[y, x] = converter.ConvertToRgb(info);
}
}
return(img);
}
/// <summary>
/// Convert from RGB to YCbCr color space (Rec 601-1 specification).
/// </summary>
///
/// <param name="rgb">Source color in <b>RGB</b> color space.</param>
/// <param name="ycbcr">Destination color in <b>YCbCr</b> color space.</param>
///
public static void FromRGB(RGB rgb, YCbCr ycbcr)
{
float r = (float)rgb.Red / 255;
float g = (float)rgb.Green / 255;
float b = (float)rgb.Blue / 255;
ycbcr.Y = (float)(0.2989 * r + 0.5866 * g + 0.1145 * b);
ycbcr.Cb = (float)(-0.1687 * r - 0.3313 * g + 0.5000 * b);
ycbcr.Cr = (float)(0.5000 * r - 0.4184 * g - 0.0816 * b);
}
/// <summary>
/// Converts a <see cref="YCbCr"/> into a <see cref="Rgb"/>
/// </summary>
/// <param name="color">The color to convert.</param>
/// <returns>The <see cref="Rgb"/></returns>
public Rgb ToRgb(YCbCr color)
{
Guard.NotNull(color, nameof(color));
// Conversion
Rgb rgb = YCbCrAndRgbConverter.Convert(color);
// Adaptation
return(this.Adapt(rgb));
}
/// <summary>
/// Convert from RGB to YCbCr color space (Rec 601-1 specification).
/// </summary>
///
/// <param name="rgb">Source color in <b>RGB</b> color space.</param>
/// <param name="ycbcr">Destination color in <b>YCbCr</b> color space.</param>
///
public static YCbCr FromRGB(Color rgb, YCbCr ycbcr)
{
float r = (float)rgb.R / 255;
float g = (float)rgb.G / 255;
float b = (float)rgb.B / 255;
ycbcr.Y = (float)(0.2989 * r + 0.5866 * g + 0.1145 * b);
ycbcr.Cb = (float)(-0.1687 * r - 0.3313 * g + 0.5000 * b);
ycbcr.Cr = (float)(0.5000 * r - 0.4184 * g - 0.0816 * b);
return(ycbcr);
}
/// <summary>
/// Converts a <see cref="YCbCr"/> into a <see cref="Rgb"/>
/// </summary>
/// <param name="color">The color to convert.</param>
/// <returns>The <see cref="Rgb"/></returns>
public Rgb ToRgb(YCbCr color)
{
Guard.NotNull(color, nameof(color));
// Conversion
Rgb rgb = YCbCrAndRgbConverter.Convert(color);
// Adaptation
// TODO: Check this!
return(rgb.WorkingSpace.Equals(this.TargetRgbWorkingSpace) ? rgb : this.Adapt(rgb));
}
public void YCbCrConstructorAssignsFields()
{
const float y = 75F;
const float cb = 64F;
const float cr = 87F;
var yCbCr = new YCbCr(y, cb, cr);
Assert.Equal(y, yCbCr.Y);
Assert.Equal(cb, yCbCr.Cb);
Assert.Equal(cr, yCbCr.Cr);
}
/// <summary>
/// Convert from YCbCr to RGB color space.
/// </summary>
///
/// <param name="ycbcr">Source color in <b>YCbCr</b> color space.</param>
/// <param name="rgb">Destination color in <b>RGB</b> color spacs.</param>
///
public static void ToRGB(YCbCr ycbcr, RGB rgb)
{
// don't warry about zeros. compiler will remove them
float r = System.Math.Max(0.0f, System.Math.Min(1.0f, (float)(ycbcr.Y + 0.0000 * ycbcr.Cb + 1.4022 * ycbcr.Cr)));
float g = System.Math.Max(0.0f, System.Math.Min(1.0f, (float)(ycbcr.Y - 0.3456 * ycbcr.Cb - 0.7145 * ycbcr.Cr)));
float b = System.Math.Max(0.0f, System.Math.Min(1.0f, (float)(ycbcr.Y + 1.7710 * ycbcr.Cb + 0.0000 * ycbcr.Cr)));
rgb.Red = (byte)(r * 255);
rgb.Green = (byte)(g * 255);
rgb.Blue = (byte)(b * 255);
rgb.Alpha = 255;
}
private static X YCbCrToX_JPEG <X>(YCbCr ycbcr, Func <double, double, double, X> func)
{
double Y = ycbcr.Y;
double Cr = ycbcr.Cr;
double Cb = ycbcr.Cb;
double R = Y + 1.40200 * (Cr - 128);
double G = Y - 0.34414 * (Cb - 128) - 0.71414 * (Cr - 128);
double B = Y + 1.77200 * (Cb - 128);
return(func(R, G, B));
}
/// <summary>
/// Process the filter on the specified image.
/// </summary>
///
/// <param name="sourceData">Source image data.</param>
/// <param name="destinationData">Destination image data.</param>
///
protected override unsafe void ProcessFilter(UnmanagedImage sourceData, UnmanagedImage destinationData)
{
int pixelSize = Image.GetPixelFormatSize(sourceData.PixelFormat) / 8;
// get width and height
int width = sourceData.Width;
int height = sourceData.Height;
int srcOffset = sourceData.Stride - width * pixelSize;
int dstOffset = destinationData.Stride - width;
RGB rgb = new RGB( );
YCbCr ycbcr = new YCbCr( );
// do the job
byte *src = (byte *)sourceData.ImageData.ToPointer( );
byte *dst = (byte *)destinationData.ImageData.ToPointer( );
byte v = 0;
// for each row
for (int y = 0; y < height; y++)
{
// for each pixel
for (int x = 0; x < width; x++, src += pixelSize, dst++)
{
rgb.Red = src[RGB.R];
rgb.Green = src[RGB.G];
rgb.Blue = src[RGB.B];
// convert to YCbCr
AForge.Imaging.YCbCr.FromRGB(rgb, ycbcr);
switch (channel)
{
case YCbCr.YIndex:
v = (byte)(ycbcr.Y * 255);
break;
case YCbCr.CbIndex:
v = (byte)((ycbcr.Cb + 0.5) * 255);
break;
case YCbCr.CrIndex:
v = (byte)((ycbcr.Cr + 0.5) * 255);
break;
}
*dst = v;
}
src += srcOffset;
dst += dstOffset;
}
}
public void Convert_Rgb_To_YCbCr(float r, float g, float b, float y, float cb, float cr)
{
// Arrange
var input = new Rgb(r, g, b);
// Act
YCbCr output = Converter.ToYCbCr(input);
// Assert
Assert.Equal(y, output.Y, FloatRoundingComparer);
Assert.Equal(cb, output.Cb, FloatRoundingComparer);
Assert.Equal(cr, output.Cr, FloatRoundingComparer);
}
/// <summary>
/// For high definition TV (HDTV)
/// </summary>
/// <typeparam name="X"></typeparam>
/// <param name="ycbcr"></param>
/// <param name="func"></param>
/// <returns></returns>
private static X YCbCrToX_BT709 <X>(YCbCr ycbcr, Func <double, double, double, X> func)
{
double Y = ycbcr.Y;
double Cr = ycbcr.Cr;
double Cb = ycbcr.Cb;
// http://www.equasys.de/colorconversion.html
double R = 1.164 * (Y - 16) + 1.596 * (Cr - 128);
double G = 1.164 * (Y - 16) - 0.392 * (Cb - 128) - 0.813 * (Cr - 128);
double B = 1.164 * (Y - 16) + 2.017 * (Cb - 128);
return(func(R, G, B));
}
// Process the filter
private unsafe void ProcessFilter( BitmapData data )
{
int width = data.Width;
int height = data.Height;
// lock overlay image
BitmapData ovrData = channelImage.LockBits(
new Rectangle( 0, 0, width, height ),
ImageLockMode.ReadOnly, PixelFormat.Format8bppIndexed );
int offset = data.Stride - width * 3;
int offsetOvr = ovrData.Stride - width;
RGB rgb = new RGB( );
YCbCr ycbcr = new YCbCr( );
// do the job
unsafe
{
byte * dst = (byte *) data.Scan0.ToPointer( );
byte * ovr = (byte *) ovrData.Scan0.ToPointer( );
// for each line
for ( int y = 0; y < height; y++ )
{
// for each pixel
for ( int x = 0; x < width; x++, dst += 3, ovr ++ )
{
rgb.Red = dst[RGB.R];
rgb.Green = dst[RGB.G];
rgb.Blue = dst[RGB.B];
// convert to YCbCr
AForge.Imaging.ColorConverter.RGB2YCbCr( rgb, ycbcr );
switch ( channel )
{
case YCbCr.YIndex:
ycbcr.Y = (double) *ovr / 255;
break;
case YCbCr.CbIndex:
ycbcr.Cb = (double) *ovr / 255 - 0.5;
break;
case YCbCr.CrIndex:
ycbcr.Cr = (double) *ovr / 255 - 0.5;
break;
}
// convert back to RGB
AForge.Imaging.ColorConverter.YCbCr2RGB( ycbcr, rgb );
dst[RGB.R] = rgb.Red;
dst[RGB.G] = rgb.Green;
dst[RGB.B] = rgb.Blue;
}
dst += offset;
ovr += offsetOvr;
}
}
// unlock
channelImage.UnlockBits( ovrData );
}
/// <summary>
/// Process the filter on the specified image.
/// </summary>
///
/// <param name="image">Source image data.</param>
/// <param name="rect">Image rectangle for processing by the filter.</param>
///
protected override unsafe void ProcessFilter( UnmanagedImage image, Rectangle rect )
{
int pixelSize = Image.GetPixelFormatSize( image.PixelFormat ) / 8;
int startX = rect.Left;
int startY = rect.Top;
int stopX = startX + rect.Width;
int stopY = startY + rect.Height;
int offset = image.Stride - rect.Width * pixelSize;
RGB rgb = new RGB( );
YCbCr ycbcr = new YCbCr( );
float ky = 0, by = 0;
float kcb = 0, bcb = 0;
float kcr = 0, bcr = 0;
// Y line parameters
if ( inY.Max != inY.Min )
{
ky = ( outY.Max - outY.Min ) / ( inY.Max - inY.Min );
by = outY.Min - ky * inY.Min;
}
// Cb line parameters
if ( inCb.Max != inCb.Min )
{
kcb = ( outCb.Max - outCb.Min ) / ( inCb.Max - inCb.Min );
bcb = outCb.Min - kcb * inCb.Min;
}
// Cr line parameters
if ( inCr.Max != inCr.Min )
{
kcr = ( outCr.Max - outCr.Min ) / ( inCr.Max - inCr.Min );
bcr = outCr.Min - kcr * inCr.Min;
}
// do the job
byte* ptr = (byte*) image.ImageData.ToPointer( );
// allign pointer to the first pixel to process
ptr += ( startY * image.Stride + startX * pixelSize );
// for each row
for ( int y = startY; y < stopY; y++ )
{
// for each pixel
for ( int x = startX; x < stopX; x++, ptr += pixelSize )
{
rgb.Red = ptr[RGB.R];
rgb.Green = ptr[RGB.G];
rgb.Blue = ptr[RGB.B];
// convert to YCbCr
BestCS.Imaging.YCbCr.FromRGB( rgb, ycbcr );
// correct Y
if ( ycbcr.Y >= inY.Max )
ycbcr.Y = outY.Max;
else if ( ycbcr.Y <= inY.Min )
ycbcr.Y = outY.Min;
else
ycbcr.Y = ky * ycbcr.Y + by;
// correct Cb
if ( ycbcr.Cb >= inCb.Max )
ycbcr.Cb = outCb.Max;
else if ( ycbcr.Cb <= inCb.Min )
ycbcr.Cb = outCb.Min;
else
ycbcr.Cb = kcb * ycbcr.Cb + bcb;
// correct Cr
if ( ycbcr.Cr >= inCr.Max )
ycbcr.Cr = outCr.Max;
else if ( ycbcr.Cr <= inCr.Min )
ycbcr.Cr = outCr.Min;
else
ycbcr.Cr = kcr * ycbcr.Cr + bcr;
// convert back to RGB
BestCS.Imaging.YCbCr.ToRGB( ycbcr, rgb );
ptr[RGB.R] = rgb.Red;
ptr[RGB.G] = rgb.Green;
ptr[RGB.B] = rgb.Blue;
}
ptr += offset;
}
}
/// <summary>
/// Process the filter on the specified image.
/// </summary>
///
/// <param name="image">Source image data.</param>
/// <param name="rect">Image rectangle for processing by the filter.</param>
///
protected override unsafe void ProcessFilter( UnmanagedImage image, Rectangle rect )
{
// get pixel size
int pixelSize = ( image.PixelFormat == PixelFormat.Format24bppRgb ) ? 3 : 4;
int startX = rect.Left;
int startY = rect.Top;
int stopX = startX + rect.Width;
int stopY = startY + rect.Height;
int offset = image.Stride - rect.Width * pixelSize;
RGB rgb = new RGB( );
YCbCr ycbcr = new YCbCr( );
bool updated;
// do the job
byte* ptr = (byte*) image.ImageData.ToPointer( );
// allign pointer to the first pixel to process
ptr += ( startY * image.Stride + startX * pixelSize );
// for each row
for ( int y = startY; y < stopY; y++ )
{
// for each pixel
for ( int x = startX; x < stopX; x++, ptr += pixelSize )
{
updated = false;
rgb.Red = ptr[RGB.R];
rgb.Green = ptr[RGB.G];
rgb.Blue = ptr[RGB.B];
// convert to YCbCr
AForge.Imaging.YCbCr.FromRGB( rgb, ycbcr );
// check YCbCr values
if (
( ycbcr.Y >= yRange.Min ) && ( ycbcr.Y <= yRange.Max ) &&
( ycbcr.Cb >= cbRange.Min ) && ( ycbcr.Cb <= cbRange.Max ) &&
( ycbcr.Cr >= crRange.Min ) && ( ycbcr.Cr <= crRange.Max )
)
{
if ( !fillOutsideRange )
{
if ( updateY ) ycbcr.Y = fillY;
if ( updateCb ) ycbcr.Cb = fillCb;
if ( updateCr ) ycbcr.Cr = fillCr;
updated = true;
}
}
else
{
if ( fillOutsideRange )
{
if ( updateY ) ycbcr.Y = fillY;
if ( updateCb ) ycbcr.Cb = fillCb;
if ( updateCr ) ycbcr.Cr = fillCr;
updated = true;
}
}
if ( updated )
{
// convert back to RGB
AForge.Imaging.YCbCr.ToRGB( ycbcr, rgb );
ptr[RGB.R] = rgb.Red;
ptr[RGB.G] = rgb.Green;
ptr[RGB.B] = rgb.Blue;
}
}
ptr += offset;
}
}
/// <summary>
/// Process the filter on the specified image.
/// </summary>
///
/// <param name="sourceData">Source image data.</param>
/// <param name="destinationData">Destination image data.</param>
///
protected override unsafe void ProcessFilter(UnmanagedImage sourceData, UnmanagedImage destinationData)
{
int pixelSize = Image.GetPixelFormatSize(sourceData.PixelFormat) / 8;
// get width and height
int width = sourceData.Width;
int height = sourceData.Height;
int srcOffset = sourceData.Stride - width * pixelSize;
int dstOffset = destinationData.Stride - width;
RGB rgb = new RGB();
YCbCr ycbcr = new YCbCr();
// do the job
byte* src = (byte*)sourceData.ImageData.ToPointer();
byte* dst = (byte*)destinationData.ImageData.ToPointer();
byte v = 0;
// for each row
for (int y = 0; y < height; y++)
{
// for each pixel
for (int x = 0; x < width; x++, src += pixelSize, dst++)
{
rgb.Red = src[RGB.R];
rgb.Green = src[RGB.G];
rgb.Blue = src[RGB.B];
// convert to YCbCr
AForge.Imaging.YCbCr.FromRGB(rgb, ycbcr);
switch (channel)
{
case YCbCr.YIndex:
v = (byte)(ycbcr.Y * 255);
break;
case YCbCr.CbIndex:
v = (byte)((ycbcr.Cb + 0.5) * 255);
break;
case YCbCr.CrIndex:
v = (byte)((ycbcr.Cr + 0.5) * 255);
break;
}
*dst = v;
}
src += srcOffset;
dst += dstOffset;
}
}
// Apply filter
public Bitmap Apply( Bitmap srcImg )
{
if ( srcImg.PixelFormat != PixelFormat.Format24bppRgb )
throw new ArgumentException( );
// get source image size
int width = srcImg.Width;
int height = srcImg.Height;
// lock source bitmap data
BitmapData srcData = srcImg.LockBits(
new Rectangle( 0, 0, width, height ),
ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb );
// create new grayscale image
Bitmap dstImg = AForge.Imaging.Image.CreateGrayscaleImage( width, height );
// lock destination bitmap data
BitmapData dstData = dstImg.LockBits(
new Rectangle( 0, 0, width, height ),
ImageLockMode.ReadWrite, PixelFormat.Format8bppIndexed );
int srcOffset = srcData.Stride - width * 3;
int dstOffset = dstData.Stride - width;
RGB rgb = new RGB( );
YCbCr ycbcr = new YCbCr( );
// do the job
unsafe
{
byte * src = (byte *) srcData.Scan0.ToPointer( );
byte * dst = (byte *) dstData.Scan0.ToPointer( );
byte v = 0;
// for each row
for ( int y = 0; y < height; y++ )
{
// for each pixel
for ( int x = 0; x < width; x++, src += 3, dst ++ )
{
rgb.Red = src[RGB.R];
rgb.Green = src[RGB.G];
rgb.Blue = src[RGB.B];
// convert to YCbCr
AForge.Imaging.ColorConverter.RGB2YCbCr( rgb, ycbcr );
switch ( channel )
{
case YCbCr.YIndex:
v = (byte) ( ycbcr.Y * 255 );
break;
case YCbCr.CbIndex:
v = (byte) ( ( ycbcr.Cb + 0.5 ) * 255 );
break;
case YCbCr.CrIndex:
v = (byte) ( ( ycbcr.Cr + 0.5 ) * 255 );
break;
}
*dst = v;
}
src += srcOffset;
dst += dstOffset;
}
}
// unlock both images
dstImg.UnlockBits( dstData );
srcImg.UnlockBits( srcData );
return dstImg;
}
/// <summary>
/// Convert from YCbCr to RGB color space.
/// </summary>
///
/// <param name="ycbcr">Source color in <b>YCbCr</b> color space.</param>
/// <param name="rgb">Destination color in <b>RGB</b> color spacs.</param>
///
public static void ToRGB(YCbCr ycbcr, RGB rgb)
{
// don't warry about zeros. compiler will remove them
float r = Math.Max(0.0f, Math.Min(1.0f, (float)(ycbcr.Y + 0.0000 * ycbcr.Cb + 1.4022 * ycbcr.Cr)));
float g = Math.Max(0.0f, Math.Min(1.0f, (float)(ycbcr.Y - 0.3456 * ycbcr.Cb - 0.7145 * ycbcr.Cr)));
float b = Math.Max(0.0f, Math.Min(1.0f, (float)(ycbcr.Y + 1.7710 * ycbcr.Cb + 0.0000 * ycbcr.Cr)));
rgb.Red = (byte)(r * 255);
rgb.Green = (byte)(g * 255);
rgb.Blue = (byte)(b * 255);
rgb.Alpha = 255;
}
/// <summary>
/// Process the filter on the specified image.
/// </summary>
///
/// <param name="image">Source image data.</param>
/// <param name="rect">Image rectangle for processing by the filter.</param>
///
/// <exception cref="NullReferenceException">Channel image was not specified.</exception>
/// <exception cref="InvalidImagePropertiesException">Channel image size does not match source
/// image size.</exception>
///
protected override unsafe void ProcessFilter( UnmanagedImage image, Rectangle rect )
{
if ( ( channelImage == null ) && ( unmanagedChannelImage == null ) )
{
throw new NullReferenceException( "Channel image was not specified." );
}
int pixelSize = Image.GetPixelFormatSize( image.PixelFormat ) / 8;
int width = image.Width;
int height = image.Height;
int startX = rect.Left;
int startY = rect.Top;
int stopX = startX + rect.Width;
int stopY = startY + rect.Height;
int offset = image.Stride - rect.Width * pixelSize;
BitmapData chData = null;
// pointer to channel's data
byte* ch;
// channel's image stride
int chStride = 0;
// check channel's image type
if ( channelImage != null )
{
// check channel's image dimension
if ( ( width != channelImage.Width ) || ( height != channelImage.Height ) )
throw new InvalidImagePropertiesException( "Channel image size does not match source image size." );
// lock channel image
chData = channelImage.LockBits(
new Rectangle( 0, 0, width, height ),
ImageLockMode.ReadOnly, PixelFormat.Format8bppIndexed );
ch = (byte*) chData.Scan0.ToPointer( );
chStride = chData.Stride;
}
else
{
// check channel's image dimension
if ( ( width != unmanagedChannelImage.Width ) || ( height != unmanagedChannelImage.Height ) )
throw new InvalidImagePropertiesException( "Channel image size does not match source image size." );
ch = (byte*) unmanagedChannelImage.ImageData;
chStride = unmanagedChannelImage.Stride;
}
int offsetCh = chStride - rect.Width;
RGB rgb = new RGB( );
YCbCr ycbcr = new YCbCr( );
// do the job
byte* dst = (byte*) image.ImageData.ToPointer( );
// allign pointer to the first pixel to process
dst += ( startY * image.Stride + startX * pixelSize );
ch += ( startY * chStride + startX );
// for each line
for ( int y = startY; y < stopY; y++ )
{
// for each pixel
for ( int x = startX; x < stopX; x++, dst += pixelSize, ch++ )
{
rgb.Red = dst[RGB.R];
rgb.Green = dst[RGB.G];
rgb.Blue = dst[RGB.B];
// convert to YCbCr
AForge.Imaging.YCbCr.FromRGB( rgb, ycbcr );
switch ( channel )
{
case YCbCr.YIndex:
ycbcr.Y = (float) *ch / 255;
break;
case YCbCr.CbIndex:
ycbcr.Cb = (float) *ch / 255 - 0.5f;
break;
case YCbCr.CrIndex:
ycbcr.Cr = (float) *ch / 255 - 0.5f;
break;
}
// convert back to RGB
AForge.Imaging.YCbCr.ToRGB( ycbcr, rgb );
dst[RGB.R] = rgb.Red;
dst[RGB.G] = rgb.Green;
dst[RGB.B] = rgb.Blue;
}
dst += offset;
ch += offsetCh;
}
if ( chData != null )
{
// unlock
channelImage.UnlockBits( chData );
}
}
// Process the filter
private unsafe void ProcessFilter( BitmapData data )
{
int width = data.Width;
int height = data.Height;
RGB rgb = new RGB( );
YCbCr ycbcr = new YCbCr( );
int offset = data.Stride - width * 3;
double ky = 0, by = 0;
double kcb = 0, bcb = 0;
double kcr = 0, bcr = 0;
// Y line params
if ( inY.Max != inY.Min )
{
ky = ( outY.Max - outY.Min ) / ( inY.Max - inY.Min );
by = outY.Min - ky * inY.Min;
}
// Cb line params
if ( inCb.Max != inCb.Min )
{
kcb = ( outCb.Max - outCb.Min ) / ( inCb.Max - inCb.Min );
bcb = outCb.Min - kcb * inCb.Min;
}
// Cr line params
if ( inCr.Max != inCr.Min )
{
kcr = ( outCr.Max - outCr.Min ) / ( inCr.Max - inCr.Min );
bcr = outCr.Min - kcr * inCr.Min;
}
// do the job
byte * ptr = (byte *) data.Scan0.ToPointer( );
// for each row
for ( int y = 0; y < height; y++ )
{
// for each pixel
for ( int x = 0; x < width; x++, ptr += 3 )
{
rgb.Red = ptr[RGB.R];
rgb.Green = ptr[RGB.G];
rgb.Blue = ptr[RGB.B];
// convert to YCbCr
AForge.Imaging.ColorConverter.RGB2YCbCr( rgb, ycbcr );
// correct Y
if ( ycbcr.Y >= inY.Max )
ycbcr.Y = outY.Max;
else if ( ycbcr.Y <= inY.Min )
ycbcr.Y = outY.Min;
else
ycbcr.Y = ky * ycbcr.Y + by;
// correct Cb
if ( ycbcr.Cb >= inCb.Max )
ycbcr.Cb = outCb.Max;
else if ( ycbcr.Cb <= inCb.Min )
ycbcr.Cb = outCb.Min;
else
ycbcr.Cb = kcb * ycbcr.Cb + bcb;
// correct Cr
if ( ycbcr.Cr >= inCr.Max )
ycbcr.Cr = outCr.Max;
else if ( ycbcr.Cr <= inCr.Min )
ycbcr.Cr = outCr.Min;
else
ycbcr.Cr = kcr * ycbcr.Cr + bcr;
// convert back to RGB
AForge.Imaging.ColorConverter.YCbCr2RGB( ycbcr, rgb );
ptr[RGB.R] = rgb.Red;
ptr[RGB.G] = rgb.Green;
ptr[RGB.B] = rgb.Blue;
}
ptr += offset;
}
}
/// <summary>
/// Convert from RGB to YCbCr color space (Rec 601-1 specification).
/// </summary>
///
/// <param name="rgb">Source color in <b>RGB</b> color space.</param>
/// <param name="ycbcr">Destination color in <b>YCbCr</b> color space.</param>
///
public static YCbCr FromRGB(Color rgb, YCbCr ycbcr)
{
float r = (float)rgb.R / 255;
float g = (float)rgb.G / 255;
float b = (float)rgb.B / 255;
ycbcr.Y = (float)(0.2989 * r + 0.5866 * g + 0.1145 * b);
ycbcr.Cb = (float)(-0.1687 * r - 0.3313 * g + 0.5000 * b);
ycbcr.Cr = (float)(0.5000 * r - 0.4184 * g - 0.0816 * b);
return ycbcr;
}
/// <summary>
/// Convert from RGB to YCbCr color space (Rec 601-1 specification).
/// </summary>
///
/// <param name="rgb">Source color in <b>RGB</b> color space.</param>
///
/// <returns>Returns <see cref="YCbCr"/> instance, which represents converted color value.</returns>
///
public static YCbCr FromRGB(Color rgb)
{
YCbCr ycbcr = new YCbCr();
FromRGB(rgb, ycbcr);
return ycbcr;
}
public Image process(Image imageIn)
{
Color rgb = new Color();
YCbCr ycbcr = new YCbCr();
float ky = 0, by = 0;
float kcb = 0, bcb = 0;
float kcr = 0, bcr = 0;
// Y line parameters
if (inY.Max != inY.Min)
{
ky = (outY.Max - outY.Min) / (inY.Max - inY.Min);
by = outY.Min - ky * inY.Min;
}
// Cb line parameters
if (inCb.Max != inCb.Min)
{
kcb = (outCb.Max - outCb.Min) / (inCb.Max - inCb.Min);
bcb = outCb.Min - kcb * inCb.Min;
}
// Cr line parameters
if (inCr.Max != inCr.Min)
{
kcr = (outCr.Max - outCr.Min) / (inCr.Max - inCr.Min);
bcr = outCr.Min - kcr * inCr.Min;
}
for (int x = 0; x < imageIn.getWidth(); x++)
{
for (int y = 0; y < imageIn.getHeight(); y++)
{
rgb.R = (byte)imageIn.getRComponent(x, y);
rgb.G = (byte)imageIn.getGComponent(x, y);
rgb.B = (byte)imageIn.getBComponent(x, y);
// convert to YCbCr
ycbcr = YCbCr.FromRGB(rgb, ycbcr);
// correct Y
if (ycbcr.Y >= inY.Max)
ycbcr.Y = outY.Max;
else if (ycbcr.Y <= inY.Min)
ycbcr.Y = outY.Min;
else
ycbcr.Y = ky * ycbcr.Y + by;
// correct Cb
if (ycbcr.Cb >= inCb.Max)
ycbcr.Cb = outCb.Max;
else if (ycbcr.Cb <= inCb.Min)
ycbcr.Cb = outCb.Min;
else
ycbcr.Cb = kcb * ycbcr.Cb + bcb;
// correct Cr
if (ycbcr.Cr >= inCr.Max)
ycbcr.Cr = outCr.Max;
else if (ycbcr.Cr <= inCr.Min)
ycbcr.Cr = outCr.Min;
else
ycbcr.Cr = kcr * ycbcr.Cr + bcr;
// convert back to RGB
rgb = YCbCr.ToRGB(ycbcr, rgb);
imageIn.setPixelColor(x, y, rgb.R, rgb.G, rgb.B);
}
}
return imageIn;
}
/// <summary>
/// Convert from YCbCr to RGB color space.
/// </summary>
///
/// <param name="ycbcr">Source color in <b>YCbCr</b> color space.</param>
/// <param name="rgb">Destination color in <b>RGB</b> color spacs.</param>
///
public static Color ToRGB(YCbCr ycbcr, Color rgb)
{
// don't warry about zeros. compiler will remove them
float r = Math.Max(0.0f, Math.Min(1.0f, (float)(ycbcr.Y + 0.0000 * ycbcr.Cb + 1.4022 * ycbcr.Cr)));
float g = Math.Max(0.0f, Math.Min(1.0f, (float)(ycbcr.Y - 0.3456 * ycbcr.Cb - 0.7145 * ycbcr.Cr)));
float b = Math.Max(0.0f, Math.Min(1.0f, (float)(ycbcr.Y + 1.7710 * ycbcr.Cb + 0.0000 * ycbcr.Cr)));
rgb.R = (byte)(r * 255);
rgb.G = (byte)(g * 255);
rgb.B = (byte)(b * 255);
//rgb.Alpha = 255;
return rgb;
}
// Process the filter
private unsafe void ProcessFilter( BitmapData data )
{
int width = data.Width;
int height = data.Height;
RGB rgb = new RGB( );
YCbCr ycbcr = new YCbCr( );
int offset = data.Stride - width * 3;
bool updated;
// do the job
byte * ptr = (byte *) data.Scan0.ToPointer( );
// for each row
for ( int y = 0; y < height; y++ )
{
// for each pixel
for ( int x = 0; x < width; x++, ptr += 3 )
{
updated = false;
rgb.Red = ptr[RGB.R];
rgb.Green = ptr[RGB.G];
rgb.Blue = ptr[RGB.B];
// convert to YCbCr
AForge.Imaging.ColorConverter.RGB2YCbCr( rgb, ycbcr );
// check YCbCr values
if (
( ycbcr.Y >= yRange.Min ) && ( ycbcr.Y <= yRange.Max ) &&
( ycbcr.Cb >= cbRange.Min ) && ( ycbcr.Cb <= cbRange.Max ) &&
( ycbcr.Cr >= crRange.Min ) && ( ycbcr.Cr <= crRange.Max )
)
{
if ( !fillOutsideRange )
{
if ( updateY ) ycbcr.Y = fillY;
if ( updateCb ) ycbcr.Cb = fillCb;
if ( updateCr ) ycbcr.Cr = fillCr;
updated = true;
}
}
else
{
if ( fillOutsideRange )
{
if ( updateY ) ycbcr.Y = fillY;
if ( updateCb ) ycbcr.Cb = fillCb;
if ( updateCr ) ycbcr.Cr = fillCr;
updated = true;
}
}
if ( updated )
{
// convert back to RGB
AForge.Imaging.ColorConverter.YCbCr2RGB( ycbcr, rgb );
ptr[RGB.R] = rgb.Red;
ptr[RGB.G] = rgb.Green;
ptr[RGB.B] = rgb.Blue;
}
}
ptr += offset;
}
}
/// <summary>
/// Convert from RGB to YCbCr color space (Rec 601-1 specification).
/// </summary>
///
/// <param name="rgb">Source color in <b>RGB</b> color space.</param>
/// <param name="ycbcr">Destination color in <b>YCbCr</b> color space.</param>
///
public static void FromRGB(RGB rgb, YCbCr ycbcr)
{
float r = (float)rgb.Red / 255;
float g = (float)rgb.Green / 255;
float b = (float)rgb.Blue / 255;
ycbcr.Y = (float)(0.2989 * r + 0.5866 * g + 0.1145 * b);
ycbcr.Cb = (float)(-0.1687 * r - 0.3313 * g + 0.5000 * b);
ycbcr.Cr = (float)(0.5000 * r - 0.4184 * g - 0.0816 * b);
}
