public static YCbCr FromRGB(RGB rgb)
{
YCbCr yCbCr = new YCbCr();
FromRGB(rgb, yCbCr);
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(RGB rgb)
{
var ycbcr = new YCbCr( );
FromRGB(rgb, ycbcr);
return(ycbcr);
}
public void SetColor(byte r, byte g, byte b)
{
RGB rgbcolor = new RGB(r,g,b);
this.color = YCbCr.FromRGB(rgbcolor);
this.colorFilter.Cb = new AForge.Range(this.color.Cb - 0.02f, this.color.Cb + 0.02f);
this.colorFilter.Cr = new AForge.Range(this.color.Cr - 0.02f, this.color.Cr + 0.02f);
this.colorFilter.Y = new AForge.Range(this.color.Y - 0.05f, this.color.Y + 0.05f);
this.applyFilters = true;
}
public static void FromRGB(RGB rgb, YCbCr ycbcr)
{
double num = ((double)rgb.Red) / 255.0;
double num2 = ((double)rgb.Green) / 255.0;
double num3 = ((double)rgb.Blue) / 255.0;
ycbcr.Y = ((0.2989 * num) + (0.5866 * num2)) + (0.1145 * num3); //image transform equation to get y component
ycbcr.Cb = ((-0.1687 * num) - (0.3313 * num2)) + (0.5 * num3); //image transform equation to get Cb component
ycbcr.Cr = ((0.5 * num) - (0.4184 * num2)) - (0.0816 * num3); //image transform equation to get Cr component
}
/// <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 RGB2YCbCr(RGB rgb, YCbCr ycbcr)
{
double r = (double)rgb.Red / 255;
double g = (double)rgb.Green / 255;
double b = (double)rgb.Blue / 255;
ycbcr.Y = 0.2989 * r + 0.5866 * g + 0.1145 * b;
ycbcr.Cb = -0.1687 * r - 0.3313 * g + 0.5000 * b;
ycbcr.Cr = 0.5000 * r - 0.4184 * g - 0.0816 * b;
}
public static void FromRGB(RGB rgb, YCbCr ycbcr)
{
float num = (float)(int)rgb.Red / 255f;
float num2 = (float)(int)rgb.Green / 255f;
float num3 = (float)(int)rgb.Blue / 255f;
ycbcr.Y = (float)(0.2989 * (double)num + 0.5866 * (double)num2 + 0.1145 * (double)num3);
ycbcr.Cb = (float)(-0.1687 * (double)num - 0.3313 * (double)num2 + 0.5 * (double)num3);
ycbcr.Cr = (float)(0.5 * (double)num - 0.4184 * (double)num2 - 0.0816 * (double)num3);
}
public static void FromRGB(RGB rgb, YCbCr ycbcr)
{
double num = ((double)rgb.Red) / 255.0;
double num2 = ((double)rgb.Green) / 255.0;
double num3 = ((double)rgb.Blue) / 255.0;
ycbcr.Y = ((0.2989 * num) + (0.5866 * num2)) + (0.1145 * num3);
ycbcr.Cb = ((-0.1687 * num) - (0.3313 * num2)) + (0.5 * num3);
ycbcr.Cr = ((0.5 * num) - (0.4184 * num2)) - (0.0816 * num3);
}
/// <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);
}
public static void ToRGB(YCbCr ycbcr, RGB rgb)
{
double num = Math.Max(0.0, Math.Min((double)1.0, (double)((ycbcr.Y + (0.0 * ycbcr.Cb)) + (1.4022 * ycbcr.Cr))));
double num2 = Math.Max(0.0, Math.Min((double)1.0, (double)((ycbcr.Y - (0.3456 * ycbcr.Cb)) - (0.7145 * ycbcr.Cr))));
double num3 = Math.Max(0.0, Math.Min((double)1.0, (double)((ycbcr.Y + (1.771 * ycbcr.Cb)) + (0.0 * ycbcr.Cr))));
rgb.Red = (byte)(num * 255.0);
rgb.Green = (byte)(num2 * 255.0);
rgb.Blue = (byte)(num3 * 255.0);
}
/// <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 YCbCr2RGB(YCbCr ycbcr, RGB rgb)
{
// don't warry about zeros. compiler will remove them
double r = Math.Max(0.0, Math.Min(1.0, ycbcr.Y + 0.0000 * ycbcr.Cb + 1.4022 * ycbcr.Cr));
double g = Math.Max(0.0, Math.Min(1.0, ycbcr.Y - 0.3456 * ycbcr.Cb - 0.7145 * ycbcr.Cr));
double b = Math.Max(0.0, Math.Min(1.0, 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);
}
public static void ToRGB(YCbCr ycbcr, RGB rgb)
{
float num = System.Math.Max(0f, System.Math.Min(1f, (float)((double)ycbcr.Y + 0.0 * (double)ycbcr.Cb + 1.4022 * (double)ycbcr.Cr)));
float num2 = System.Math.Max(0f, System.Math.Min(1f, (float)((double)ycbcr.Y - 0.3456 * (double)ycbcr.Cb - 0.7145 * (double)ycbcr.Cr)));
float num3 = System.Math.Max(0f, System.Math.Min(1f, (float)((double)ycbcr.Y + 1.771 * (double)ycbcr.Cb + 0.0 * (double)ycbcr.Cr)));
rgb.Red = (byte)(num * 255f);
rgb.Green = (byte)(num2 * 255f);
rgb.Blue = (byte)(num3 * 255f);
rgb.Alpha = byte.MaxValue;
}
/// <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
var r = System.Math.Max(0.0f, System.Math.Min(1.0f, (float)(ycbcr.Y + 0.0000 * ycbcr.Cb + 1.4022 * ycbcr.Cr)));
var g = System.Math.Max(0.0f, System.Math.Min(1.0f, (float)(ycbcr.Y - 0.3456 * ycbcr.Cb - 0.7145 * ycbcr.Cr)));
var 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;
}
/// <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 space.</param>
///
public static void ToRGB(YCbCr ycbcr, RGB rgb)
{
// Don't worry 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;
}
private unsafe void ProcessImage(UnmanagedImage image)
{
this.CheckSourceFormat(image.PixelFormat);
int width = image.Width;
int height = image.Height;
this.pixels = this.pixelsWithoutBlack = 0;
int[] numArray = new int[0x100];
int[] numArray2 = new int[0x100];
int[] numArray3 = new int[0x100];
int[] numArray4 = new int[0x100];
int[] numArray5 = new int[0x100];
int[] numArray6 = new int[0x100];
RGB rgb = new RGB();
YCbCr ycbcr = new YCbCr();
int num3 = (image.PixelFormat == PixelFormat.Format24bppRgb) ? 3 : 4;
int num4 = image.Stride - (width * num3);
byte *numPtr = (byte *)image.ImageData.ToPointer();
for (int i = 0; i < height; i++)
{
int num6 = 0;
while (num6 < width)
{
rgb.Red = numPtr[2];
rgb.Green = numPtr[1];
rgb.Blue = numPtr[0];
YCbCr.FromRGB(rgb, ycbcr);
numArray[(int)(ycbcr.Y * 255.0)]++;
numArray2[(int)((ycbcr.Cb + 0.5) * 255.0)]++;
numArray3[(int)((ycbcr.Cr + 0.5) * 255.0)]++;
this.pixels++;
if (((ycbcr.Y != 0.0) || (ycbcr.Cb != 0.0)) || (ycbcr.Cr != 0.0))
{
numArray4[(int)(ycbcr.Y * 255.0)]++;
numArray5[(int)((ycbcr.Cb + 0.5) * 255.0)]++;
numArray6[(int)((ycbcr.Cr + 0.5) * 255.0)]++;
this.pixelsWithoutBlack++;
}
num6++;
numPtr += num3;
}
numPtr += num4;
}
this.yHistogram = new ContinuousHistogram(numArray, new DoubleRange(0.0, 1.0));
this.cbHistogram = new ContinuousHistogram(numArray2, new DoubleRange(-0.5, 0.5));
this.crHistogram = new ContinuousHistogram(numArray3, new DoubleRange(-0.5, 0.5));
this.yHistogramWithoutBlack = new ContinuousHistogram(numArray4, new DoubleRange(0.0, 1.0));
this.cbHistogramWithoutBlack = new ContinuousHistogram(numArray5, new DoubleRange(-0.5, 0.5));
this.crHistogramWithoutBlack = new ContinuousHistogram(numArray6, new DoubleRange(-0.5, 0.5));
}
private unsafe void ProcessImage(UnmanagedImage image, byte *mask, int maskLineSize)
{
int width = image.Width;
int height = image.Height;
pixels = (pixelsWithoutBlack = 0);
int[] array = new int[256];
int[] array2 = new int[256];
int[] array3 = new int[256];
int[] array4 = new int[256];
int[] array5 = new int[256];
int[] array6 = new int[256];
RGB rGB = new RGB();
YCbCr yCbCr = new YCbCr();
int num = (image.PixelFormat == PixelFormat.Format24bppRgb) ? 3 : 4;
int num2 = image.Stride - width * num;
int num3 = maskLineSize - width;
byte *ptr = (byte *)image.ImageData.ToPointer();
if (mask == null)
{
for (int i = 0; i < height; i++)
{
int num4 = 0;
while (num4 < width)
{
rGB.Red = ptr[2];
rGB.Green = ptr[1];
rGB.Blue = *ptr;
YCbCr.FromRGB(rGB, yCbCr);
array[(int)(yCbCr.Y * 255f)]++;
array2[(int)(((double)yCbCr.Cb + 0.5) * 255.0)]++;
array3[(int)(((double)yCbCr.Cr + 0.5) * 255.0)]++;
pixels++;
if ((double)yCbCr.Y != 0.0 || (double)yCbCr.Cb != 0.0 || (double)yCbCr.Cr != 0.0)
{
array4[(int)(yCbCr.Y * 255f)]++;
array5[(int)(((double)yCbCr.Cb + 0.5) * 255.0)]++;
array6[(int)(((double)yCbCr.Cr + 0.5) * 255.0)]++;
pixelsWithoutBlack++;
}
num4++;
ptr += num;
}
ptr += num2;
}
}
else
{
for (int j = 0; j < height; j++)
{
int num5 = 0;
while (num5 < width)
{
if (*mask != 0)
{
rGB.Red = ptr[2];
rGB.Green = ptr[1];
rGB.Blue = *ptr;
YCbCr.FromRGB(rGB, yCbCr);
array[(int)(yCbCr.Y * 255f)]++;
array2[(int)(((double)yCbCr.Cb + 0.5) * 255.0)]++;
array3[(int)(((double)yCbCr.Cr + 0.5) * 255.0)]++;
pixels++;
if ((double)yCbCr.Y != 0.0 || (double)yCbCr.Cb != 0.0 || (double)yCbCr.Cr != 0.0)
{
array4[(int)(yCbCr.Y * 255f)]++;
array5[(int)(((double)yCbCr.Cb + 0.5) * 255.0)]++;
array6[(int)(((double)yCbCr.Cr + 0.5) * 255.0)]++;
pixelsWithoutBlack++;
}
}
num5++;
ptr += num;
mask++;
}
ptr += num2;
mask += num3;
}
}
yHistogram = new ContinuousHistogram(array, new Range(0f, 1f));
cbHistogram = new ContinuousHistogram(array2, new Range(-0.5f, 0.5f));
crHistogram = new ContinuousHistogram(array3, new Range(-0.5f, 0.5f));
yHistogramWithoutBlack = new ContinuousHistogram(array4, new Range(0f, 1f));
cbHistogramWithoutBlack = new ContinuousHistogram(array5, new Range(-0.5f, 0.5f));
crHistogramWithoutBlack = new ContinuousHistogram(array6, new Range(-0.5f, 0.5f));
}
/// <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>
/// 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 );
}
// Gather statistics for the specified image
private unsafe void ProcessImage(UnmanagedImage image, byte *mask, int maskLineSize)
{
// get image dimension
int width = image.Width;
int height = image.Height;
pixels = pixelsWithoutBlack = 0;
int[] yhisto = new int[256];
int[] cbhisto = new int[256];
int[] crhisto = new int[256];
int[] yhistoWB = new int[256];
int[] cbhistoWB = new int[256];
int[] crhistoWB = new int[256];
RGB rgb = new RGB( );
YCbCr ycbcr = new YCbCr( );
int pixelSize = (image.PixelFormat == PixelFormat.Format24bppRgb) ? 3 : 4;
int offset = image.Stride - width * pixelSize;
int maskOffset = maskLineSize - width;
// do the job
byte *p = (byte *)image.ImageData.ToPointer( );
if (mask == null)
{
// for each line
for (int y = 0; y < height; y++)
{
// for each pixel
for (int x = 0; x < width; x++, p += pixelSize)
{
rgb.Red = p[RGB.R];
rgb.Green = p[RGB.G];
rgb.Blue = p[RGB.B];
// convert to YCbCr color space
AForge.Imaging.YCbCr.FromRGB(rgb, ycbcr);
yhisto[(int)(ycbcr.Y * 255)]++;
cbhisto[(int)((ycbcr.Cb + 0.5) * 255)]++;
crhisto[(int)((ycbcr.Cr + 0.5) * 255)]++;
pixels++;
if ((ycbcr.Y != 0.0) || (ycbcr.Cb != 0.0) || (ycbcr.Cr != 0.0))
{
yhistoWB[(int)(ycbcr.Y * 255)]++;
cbhistoWB[(int)((ycbcr.Cb + 0.5) * 255)]++;
crhistoWB[(int)((ycbcr.Cr + 0.5) * 255)]++;
pixelsWithoutBlack++;
}
}
p += offset;
}
}
else
{
// for each line
for (int y = 0; y < height; y++)
{
// for each pixel
for (int x = 0; x < width; x++, p += pixelSize, mask++)
{
if (*mask == 0)
{
continue;
}
rgb.Red = p[RGB.R];
rgb.Green = p[RGB.G];
rgb.Blue = p[RGB.B];
// convert to YCbCr color space
AForge.Imaging.YCbCr.FromRGB(rgb, ycbcr);
yhisto[(int)(ycbcr.Y * 255)]++;
cbhisto[(int)((ycbcr.Cb + 0.5) * 255)]++;
crhisto[(int)((ycbcr.Cr + 0.5) * 255)]++;
pixels++;
if ((ycbcr.Y != 0.0) || (ycbcr.Cb != 0.0) || (ycbcr.Cr != 0.0))
{
yhistoWB[(int)(ycbcr.Y * 255)]++;
cbhistoWB[(int)((ycbcr.Cb + 0.5) * 255)]++;
crhistoWB[(int)((ycbcr.Cr + 0.5) * 255)]++;
pixelsWithoutBlack++;
}
}
p += offset;
mask += maskOffset;
}
}
// create histograms
yHistogram = new ContinuousHistogram(yhisto, new Range(0.0f, 1.0f));
cbHistogram = new ContinuousHistogram(cbhisto, new Range(-0.5f, 0.5f));
crHistogram = new ContinuousHistogram(crhisto, new Range(-0.5f, 0.5f));
yHistogramWithoutBlack = new ContinuousHistogram(yhistoWB, new Range(0.0f, 1.0f));
cbHistogramWithoutBlack = new ContinuousHistogram(cbhistoWB, new Range(-0.5f, 0.5f));
crHistogramWithoutBlack = new ContinuousHistogram(crhistoWB, new Range(-0.5f, 0.5f));
}
/// <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 );
}
// On mouse position over image changed
private void document_MouseImagePosition(object sender, SelectionEventArgs e)
{
if (e.Location.X >= 0)
{
this.PositionToolStripStatusLabel.Text = string.Format(" ({0}, {1})", e.Location.X, e.Location.Y);
// get current color
Bitmap image = ((ImageHandlerForm)sender).Image;
if (image.PixelFormat == PixelFormat.Format24bppRgb)
{
Color color = image.GetPixel(e.Location.X, e.Location.Y);
RGB rgb = new RGB(color);
YCbCr ycbcr = new YCbCr();
AForge.Imaging.ColorConverter.RGB2YCbCr(rgb, ycbcr);
// RGB
this.colorPanel.Text = string.Format("RGB: {0}, {1}, {2}", color.R, color.G, color.B);
// HSL
this.hslPanel.Text = string.Format("HSL: {0}, {1:F3}, {2:F3}", (int)color.GetHue(), color.GetSaturation(), color.GetBrightness());
// YCbCr
this.ycbcrPanel.Text = string.Format("YCbCr: {0:F3}, {1:F3}, {2:F3}", ycbcr.Y, ycbcr.Cb, ycbcr.Cr);
}
else if (image.PixelFormat == PixelFormat.Format8bppIndexed)
{
Color color = image.GetPixel(e.Location.X, e.Location.Y);
this.colorPanel.Text = "Gray: " + color.R.ToString();
this.hslPanel.Text = "";
this.ycbcrPanel.Text = "";
}
}
else
{
this.PositionToolStripStatusLabel.Text = "";
this.colorPanel.Text = "";
this.hslPanel.Text = "";
this.ycbcrPanel.Text = "";
}
}
// On mouse position over image changed
private void document_MouseImagePosition(object sender, SelectionEventArgs e)
{
if (e.Location.X >= 0)
{
this.selectionPanel.Text = string.Format( "({0}, {1})", e.Location.X, e.Location.Y );
// get current color
Bitmap image = ((ImageDoc) sender).Image;
if (image.PixelFormat == PixelFormat.Format24bppRgb)
{
Color color = image.GetPixel(e.Location.X, e.Location.Y);
RGB rgb = new RGB( color );
YCbCr ycbcr = new YCbCr( );
AForge.Imaging.ColorConverter.RGB2YCbCr( rgb, ycbcr );
// RGB
this.colorPanel.Text = string.Format( "RGB: {0}; {1}; {2}", color.R, color.G, color.B );
// HSL
this.hslPanel.Text = string.Format( "HSL: {0}; {1:F3}; {2:F3}", (int) color.GetHue(), color.GetSaturation(), color.GetBrightness() );
// YCbCr
this.ycbcrPanel.Text = string.Format( "YCbCr: {0:F3}; {1:F3}; {2:F3}", ycbcr.Y, ycbcr.Cb, ycbcr.Cr );
//SS: отображение области для расчета среднего значения цвета
Rectangle avArea=((ImageDoc)sender).AverageArea;
if (!avArea.IsEmpty)
this.avColorPanel.Text = string.Format("AVERAGE: [{0}; {1}] - [{2}; {3}]", avArea.Left, avArea.Top, avArea.Right, avArea.Bottom);
else
this.avColorPanel.Text = "";
if (((ImageDoc)sender).SelectingArea)
this.infoPanel.Text = "Now select area or press right mouse button to cancel";
else if (((ImageDoc)sender).SelectingPoint || ((ImageDoc)sender).SelectingLayerPoint)
this.infoPanel.Text = "Now pick a point or press right mouse button to cancel";
else
this.infoPanel.Text = "";
}
else if (image.PixelFormat == PixelFormat.Format8bppIndexed)
{
Color color = image.GetPixel(e.Location.X, e.Location.Y);
this.colorPanel.Text = "Gray: " + color.R.ToString();
this.hslPanel.Text = "";
this.ycbcrPanel.Text = "";
}
}
else
{
this.selectionPanel.Text = "";
this.colorPanel.Text = "";
this.hslPanel.Text = "";
this.ycbcrPanel.Text = "";
}
}
// Gather statistics
private void ProcessImage( BitmapData imageData, int width, int height )
{
pixels = pixelsWithoutBlack = 0;
int[] yhisto = new int[256];
int[] cbhisto = new int[256];
int[] crhisto = new int[256];
int[] yhistoWB = new int[256];
int[] cbhistoWB = new int[256];
int[] crhistoWB = new int[256];
RGB rgb = new RGB( );
YCbCr ycbcr = new YCbCr( );
int offset = imageData.Stride - width * 3;
// do the job
unsafe
{
byte * p = (byte *) imageData.Scan0.ToPointer( );
// for each line
for ( int y = 0; y < height; y++ )
{
// for each pixel
for ( int x = 0; x < width; x++, p += 3 )
{
rgb.Red = p[RGB.R];
rgb.Green = p[RGB.G];
rgb.Blue = p[RGB.B];
// convert to YCbCr color space
AForge.Imaging.ColorConverter.RGB2YCbCr( rgb, ycbcr );
yhisto [(int) ( ycbcr.Y * 255 )]++;
cbhisto[(int) ( ( ycbcr.Cb + 0.5 ) * 255 )]++;
crhisto[(int) ( ( ycbcr.Cr + 0.5 ) * 255 )]++;
pixels++;
if ( ( ycbcr.Y != 0.0 ) || ( ycbcr.Cb != 0.0 ) || ( ycbcr.Cr != 0.0 ) )
{
yhistoWB [(int) ( ycbcr.Y * 255 )]++;
cbhistoWB[(int) ( ( ycbcr.Cb + 0.5 ) * 255 )]++;
crhistoWB[(int) ( ( ycbcr.Cr + 0.5 ) * 255 )]++;
pixelsWithoutBlack++;
}
}
p += offset;
}
}
// create histograms
yHistogram = new HistogramD( yhisto , new RangeD( 0.0, 1.0 ) );
cbHistogram = new HistogramD( cbhisto, new RangeD( -0.5, 0.5 ) );
crHistogram = new HistogramD( crhisto, new RangeD( -0.5, 0.5 ) );
yHistogramWithoutBlack = new HistogramD( yhistoWB , new RangeD( 0.0, 1.0 ) );
cbHistogramWithoutBlack = new HistogramD( cbhistoWB, new RangeD( -0.5, 0.5 ) );
crHistogramWithoutBlack = new HistogramD( crhistoWB, new RangeD( -0.5, 0.5 ) );
}
// Gather statistics for the specified image
private unsafe void ProcessImage(UnmanagedImage image, byte* mask, int maskLineSize)
{
// get image dimension
int width = image.Width;
int height = image.Height;
pixels = pixelsWithoutBlack = 0;
int[] yhisto = new int[256];
int[] cbhisto = new int[256];
int[] crhisto = new int[256];
int[] yhistoWB = new int[256];
int[] cbhistoWB = new int[256];
int[] crhistoWB = new int[256];
RGB rgb = new RGB();
YCbCr ycbcr = new YCbCr();
int pixelSize = (image.PixelFormat == PixelFormat.Format24bppRgb) ? 3 : 4;
int offset = image.Stride - width * pixelSize;
int maskOffset = maskLineSize - width;
// do the job
byte* p = (byte*)image.ImageData.ToPointer();
if (mask == null)
{
// for each line
for (int y = 0; y < height; y++)
{
// for each pixel
for (int x = 0; x < width; x++, p += pixelSize)
{
rgb.Red = p[RGB.R];
rgb.Green = p[RGB.G];
rgb.Blue = p[RGB.B];
// convert to YCbCr color space
AForge.Imaging.YCbCr.FromRGB(rgb, ycbcr);
yhisto[(int)(ycbcr.Y * 255)]++;
cbhisto[(int)((ycbcr.Cb + 0.5) * 255)]++;
crhisto[(int)((ycbcr.Cr + 0.5) * 255)]++;
pixels++;
if ((ycbcr.Y != 0.0) || (ycbcr.Cb != 0.0) || (ycbcr.Cr != 0.0))
{
yhistoWB[(int)(ycbcr.Y * 255)]++;
cbhistoWB[(int)((ycbcr.Cb + 0.5) * 255)]++;
crhistoWB[(int)((ycbcr.Cr + 0.5) * 255)]++;
pixelsWithoutBlack++;
}
}
p += offset;
}
}
else
{
// for each line
for (int y = 0; y < height; y++)
{
// for each pixel
for (int x = 0; x < width; x++, p += pixelSize, mask++)
{
if (*mask == 0)
continue;
rgb.Red = p[RGB.R];
rgb.Green = p[RGB.G];
rgb.Blue = p[RGB.B];
// convert to YCbCr color space
AForge.Imaging.YCbCr.FromRGB(rgb, ycbcr);
yhisto[(int)(ycbcr.Y * 255)]++;
cbhisto[(int)((ycbcr.Cb + 0.5) * 255)]++;
crhisto[(int)((ycbcr.Cr + 0.5) * 255)]++;
pixels++;
if ((ycbcr.Y != 0.0) || (ycbcr.Cb != 0.0) || (ycbcr.Cr != 0.0))
{
yhistoWB[(int)(ycbcr.Y * 255)]++;
cbhistoWB[(int)((ycbcr.Cb + 0.5) * 255)]++;
crhistoWB[(int)((ycbcr.Cr + 0.5) * 255)]++;
pixelsWithoutBlack++;
}
}
p += offset;
mask += maskOffset;
}
}
// create histograms
yHistogram = new ContinuousHistogram(yhisto, new Range(0.0f, 1.0f));
cbHistogram = new ContinuousHistogram(cbhisto, new Range(-0.5f, 0.5f));
crHistogram = new ContinuousHistogram(crhisto, new Range(-0.5f, 0.5f));
yHistogramWithoutBlack = new ContinuousHistogram(yhistoWB, new Range(0.0f, 1.0f));
cbHistogramWithoutBlack = new ContinuousHistogram(cbhistoWB, new Range(-0.5f, 0.5f));
crHistogramWithoutBlack = new ContinuousHistogram(crhistoWB, new Range(-0.5f, 0.5f));
}
// Convert from YCbCr to RGB color space
public static void YCbCr2RGB( YCbCr ycbcr, RGB rgb )
{
// don't warry about zeros. compiler will remove them
double r = Math.Max( 0.0, Math.Min( 1.0, ycbcr.Y + 0.0000 * ycbcr.Cb + 1.4022 * ycbcr.Cr ) );
double g = Math.Max( 0.0, Math.Min( 1.0, ycbcr.Y - 0.3456 * ycbcr.Cb - 0.7145 * ycbcr.Cr ) );
double b = Math.Max( 0.0, Math.Min( 1.0, 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 );
}
/// <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 )
{
double r = (double) rgb.Red / 255;
double g = (double) rgb.Green / 255;
double b = (double) rgb.Blue / 255;
ycbcr.Y = 0.2989 * r + 0.5866 * g + 0.1145 * b;
ycbcr.Cb = -0.1687 * r - 0.3313 * g + 0.5000 * b;
ycbcr.Cr = 0.5000 * r - 0.4184 * g - 0.0816 * b;
}
// Gather statistics
private void ProcessImage(BitmapData imageData, int width, int height)
{
pixels = pixelsWithoutBlack = 0;
int[] yhisto = new int[256];
int[] cbhisto = new int[256];
int[] crhisto = new int[256];
int[] yhistoWB = new int[256];
int[] cbhistoWB = new int[256];
int[] crhistoWB = new int[256];
RGB rgb = new RGB( );
YCbCr ycbcr = new YCbCr( );
int offset = imageData.Stride - width * 3;
// do the job
unsafe
{
byte *p = (byte *)imageData.Scan0.ToPointer( );
// for each line
for (int y = 0; y < height; y++)
{
// for each pixel
for (int x = 0; x < width; x++, p += 3)
{
rgb.Red = p[RGB.R];
rgb.Green = p[RGB.G];
rgb.Blue = p[RGB.B];
// convert to YCbCr color space
AForge.Imaging.ColorConverter.RGB2YCbCr(rgb, ycbcr);
yhisto [(int)(ycbcr.Y * 255)]++;
cbhisto[(int)((ycbcr.Cb + 0.5) * 255)]++;
crhisto[(int)((ycbcr.Cr + 0.5) * 255)]++;
pixels++;
if ((ycbcr.Y != 0.0) || (ycbcr.Cb != 0.0) || (ycbcr.Cr != 0.0))
{
yhistoWB [(int)(ycbcr.Y * 255)]++;
cbhistoWB[(int)((ycbcr.Cb + 0.5) * 255)]++;
crhistoWB[(int)((ycbcr.Cr + 0.5) * 255)]++;
pixelsWithoutBlack++;
}
}
p += offset;
}
}
// create histograms
yHistogram = new HistogramD(yhisto, new RangeD(0.0, 1.0));
cbHistogram = new HistogramD(cbhisto, new RangeD(-0.5, 0.5));
crHistogram = new HistogramD(crhisto, new RangeD(-0.5, 0.5));
yHistogramWithoutBlack = new HistogramD(yhistoWB, new RangeD(0.0, 1.0));
cbHistogramWithoutBlack = new HistogramD(cbhistoWB, new RangeD(-0.5, 0.5));
crHistogramWithoutBlack = new HistogramD(crhistoWB, new RangeD(-0.5, 0.5));
}
