/// <summary>
/// Test function, to generate the gray level picture
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BtnGetGrayLevel_Click(object sender, RoutedEventArgs e)
{
var fileBytes = File.ReadAllBytes(_imageLocation);
grayscaleListY.Clear();
grayscaleListU.Clear();
grayscaleListV.Clear();
var sw = Stopwatch.StartNew();//for count time used
Bitmap grayScaleBitMap = new Bitmap(_imageLocation);
for (int x = 0; x < grayScaleBitMap.Width; x++)
{
for (int y = 0; y < grayScaleBitMap.Height; y++)
{
System.Drawing.Color pixelColor = grayScaleBitMap.GetPixel(x, y);
int grayscaleY = (int)(ColorSpaceConversion.RgbToY(pixelColor.R, pixelColor.G, pixelColor.B));//convert color to gray
int grayscaleU = (int)(ColorSpaceConversion.RgbToU(pixelColor.R, pixelColor.G, pixelColor.B));
int grayscaleV = (int)(ColorSpaceConversion.RgbToV(pixelColor.R, pixelColor.G, pixelColor.B));
grayscaleListY.Add(grayscaleY);
grayscaleListU.Add(grayscaleU);
grayscaleListV.Add(grayscaleV);
System.Drawing.Color newColor = System.Drawing.Color.FromArgb(pixelColor.A, grayscaleY, grayscaleY, grayscaleY);
grayScaleBitMap.SetPixel(x, y, newColor);
}
}
BitmapToImageSource(GrayScaleImage, grayScaleBitMap); //render gray image
sw.Stop();
grayScaleBitMap.Save(AppDomain.CurrentDomain.BaseDirectory + "grayScaleImage.jpg");//save to LBSWatermarkingWithUI/bin/debug
EmbedTime.Text = String.Format("{0}ms", sw.ElapsedMilliseconds);
}
/// <inheritdoc/>
public byte[] Decompress(byte[] blockData, int width, int height)
{
int totalPixels = width * height;
byte[] decompressed = new byte[totalPixels * 3];
Span <ImageSharp.PixelFormats.Rgb24> rgb24Span = MemoryMarshal.Cast <byte, ImageSharp.PixelFormats.Rgb24>(decompressed);
// Same as Y216 with least significant 6 bits set to zero.
var pixel = default(ImageSharp.PixelFormats.Rgb24);
int pixelIdx = 0;
for (int i = 0; i < blockData.Length; i += 8)
{
uint y0 = BitConverter.ToUInt16(blockData, i);
uint u = BitConverter.ToUInt16(blockData, i + 2);
uint y1 = BitConverter.ToUInt16(blockData, i + 4);
uint v = BitConverter.ToUInt16(blockData, i + 6);
y0 = (y0 >> 6) - 64;
u = (u >> 6) - 512;
y1 = (y1 >> 6) - 64;
v = (v >> 6) - 512;
Vector4 rgbVec = ColorSpaceConversion.YuvToRgba10Bit(y0, u, v);
pixel.FromVector4(rgbVec);
rgb24Span[pixelIdx++] = pixel;
if (pixelIdx >= totalPixels)
{
break;
}
rgbVec = ColorSpaceConversion.YuvToRgba10Bit(y1, u, v);
pixel.FromVector4(rgbVec);
rgb24Span[pixelIdx++] = pixel;
}
return(decompressed);
}
/// <inheritdoc/>
public byte[] Decompress(byte[] blockData, int width, int height)
{
int totalPixels = width * height;
byte[] decompressed = new byte[totalPixels * 3];
Span <ImageSharp.PixelFormats.Rgb24> rgb24Span = MemoryMarshal.Cast <byte, ImageSharp.PixelFormats.Rgb24>(decompressed);
var pixel = default(ImageSharp.PixelFormats.Rgb24);
int pixelIdx = 0;
for (int i = 0; i < blockData.Length; i += 4)
{
int y0 = blockData[i];
int u = blockData[i + 1];
int y1 = blockData[i + 2];
int v = blockData[i + 3];
y0 -= 16;
u -= 128;
y1 -= 16;
v -= 128;
Vector4 rgbVec = ColorSpaceConversion.YuvToRgba8Bit(y0, u, v);
pixel.FromVector4(rgbVec);
rgb24Span[pixelIdx++] = pixel;
if (pixelIdx >= totalPixels)
{
break;
}
rgbVec = ColorSpaceConversion.YuvToRgba8Bit(y1, u, v);
pixel.FromVector4(rgbVec);
rgb24Span[pixelIdx++] = pixel;
}
return(decompressed);
}
/// <inheritdoc/>
public byte[] Decompress(byte[] blockData, int width, int height)
{
int totalPixels = width * height;
byte[] decompressed = new byte[totalPixels * 3];
Span <ImageSharp.PixelFormats.Rgb24> rgb24Span = MemoryMarshal.Cast <byte, ImageSharp.PixelFormats.Rgb24>(decompressed);
var pixel = default(ImageSharp.PixelFormats.Rgb24);
int pixelIdx = 0;
for (int i = 0; i < blockData.Length; i += 8)
{
uint y0 = BitConverter.ToUInt16(blockData, i);
uint u = BitConverter.ToUInt16(blockData, i + 2);
uint y1 = BitConverter.ToUInt16(blockData, i + 4);
uint v = BitConverter.ToUInt16(blockData, i + 6);
y0 -= 4096;
u -= 32768;
y1 -= 4096;
v -= 32768;
Vector4 rgbVec = ColorSpaceConversion.YuvToRgba16Bit(y0, u, v);
pixel.FromVector4(rgbVec);
rgb24Span[pixelIdx++] = pixel;
if (pixelIdx >= totalPixels)
{
break;
}
rgbVec = ColorSpaceConversion.YuvToRgba16Bit(y1, u, v);
pixel.FromVector4(rgbVec);
rgb24Span[pixelIdx++] = pixel;
}
return(decompressed);
}
