/// <summary>
/// Get rectangle contain object in current frame
/// </summary>
/// <param name="templateInfo">Tracking template information</param>
/// <param name="source">Frame</param>
/// <returns>Rectangle contain object</returns>
public static Rectangle TemplateColorTracking(ImageStatistics templateInfo, ref UnmanagedImage source)
{
UnmanagedImage image = source.Clone();
// create filter
EuclideanColorFiltering filter = new EuclideanColorFiltering();
// set center colol and radius
filter.CenterColor = new RGB(
(byte)templateInfo.Red.Mean,
(byte)templateInfo.Green.Mean,
(byte)templateInfo.Blue.Mean);
filter.Radius = 30;
// apply the filter
filter.ApplyInPlace(image);
image = Grayscale.CommonAlgorithms.BT709.Apply(image);
OtsuThreshold threshold = new OtsuThreshold();
threshold.ApplyInPlace(image);
BlobCounter blobCounter = new BlobCounter();
blobCounter.ObjectsOrder = ObjectsOrder.Size;
blobCounter.ProcessImage(image);
Rectangle rect = blobCounter.ObjectsCount > 0 ? blobCounter.GetObjectsRectangles()[0] : Rectangle.Empty;
return rect;
}
/// <summary>
/// Perform color dithering for the specified image.
/// </summary>
///
/// <param name="sourceImage">Source image to do color dithering for.</param>
///
/// <returns>Returns color dithered image. See <see cref="ColorTable"/> for information about format of
/// the result image.</returns>
///
/// <exception cref="UnsupportedImageFormatException">Unsupported pixel format of the source image. It must 24 or 32 bpp color image.</exception>
///
public unsafe Bitmap Apply( UnmanagedImage sourceImage )
{
if ( ( sourceImage.PixelFormat != PixelFormat.Format24bppRgb ) &&
( sourceImage.PixelFormat != PixelFormat.Format32bppRgb ) &&
( sourceImage.PixelFormat != PixelFormat.Format32bppArgb ) &&
( sourceImage.PixelFormat != PixelFormat.Format32bppPArgb ) )
{
throw new UnsupportedImageFormatException( "Unsupported pixel format of the source image." );
}
cache.Clear( );
// make a copy of the original image
UnmanagedImage source = sourceImage.Clone( );
// get image size
width = sourceImage.Width;
height = sourceImage.Height;
stride = sourceImage.Stride;
pixelSize = Bitmap.GetPixelFormatSize( sourceImage.PixelFormat ) / 8;
int offset = stride - width * pixelSize;
// create destination image
Bitmap destImage = new Bitmap( width, height, ( colorTable.Length > 16 ) ?
PixelFormat.Format8bppIndexed : PixelFormat.Format4bppIndexed );
// and init its palette
ColorPalette cp = destImage.Palette;
for ( int i = 0, n = colorTable.Length; i < n; i++ )
{
cp.Entries[i] = colorTable[i];
}
destImage.Palette = cp;
// lock destination image
BitmapData destData = destImage.LockBits( new Rectangle( 0, 0, width, height ),
ImageLockMode.ReadWrite, destImage.PixelFormat );
// pixel values
int r, g, b;
// do the job
byte* ptr = (byte*) source.ImageData.ToPointer( );
byte* dstBase = (byte*) destData.Scan0.ToPointer( );
byte colorIndex;
bool is8bpp = ( colorTable.Length > 16 );
// for each line
for ( y = 0; y < height; y++ )
{
byte* dst = dstBase + y * destData.Stride;
// for each pixels
for ( x = 0; x < width; x++, ptr += pixelSize )
{
r = ptr[RGB.R];
g = ptr[RGB.G];
b = ptr[RGB.B];
// get color from palette, which is the closest to current pixel's value
Color closestColor = GetClosestColor( r, g, b, out colorIndex );
// do error diffusion
Diffuse( r - closestColor.R, g - closestColor.G, b - closestColor.B, ptr );
// write color index as pixel's value to destination image
if ( is8bpp )
{
*dst = colorIndex;
dst++;
}
else
{
if ( x % 2 == 0 )
{
*dst |= (byte) ( colorIndex << 4 );
}
else
{
*dst |= ( colorIndex );
dst++;
}
}
}
ptr += offset;
}
destImage.UnlockBits( destData );
source.Dispose( );
return destImage;
}
/// <summary>
/// Process the filter on the specified image.
/// </summary>
///
/// <param name="sourceData">Source image data.</param>
/// <param name="destinationData">Destination image data.</param>
///
protected unsafe override void ProcessFilter(UnmanagedImage sourceData, UnmanagedImage destinationData)
{
int width = sourceData.Width;
int height = sourceData.Height;
PixelFormat format = sourceData.PixelFormat;
int pixelSize = System.Drawing.Bitmap.GetPixelFormatSize(format) / 8;
sourceData.Clone();
UnmanagedImage temp = UnmanagedImage.Create(width, height, format);
int lineWidth = width * pixelSize;
int srcStride = temp.Stride;
int srcOffset = srcStride - lineWidth;
int dstStride = destinationData.Stride;
int dstOffset = dstStride - lineWidth;
byte* srcStart = (byte*)temp.ImageData.ToPointer();
byte* dstStart = (byte*)destinationData.ImageData.ToPointer();
// first
Convolution c = new Convolution(masks[0]);
c.Apply(sourceData, destinationData);
// others
for (int i = 1; i < masks.Length; i++)
{
c.Kernel = masks[i];
c.Apply(sourceData, temp);
byte* src = srcStart;
byte* dst = dstStart;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < lineWidth; x++, src++, dst++)
{
if (*src > *dst)
*dst = *src;
}
dst += dstOffset;
src += srcOffset;
}
}
}
public static Bitmap MatrixBlend(UnmanagedImage uOriginal, Bitmap compare, byte alpha)
{
//ref: http://ithoughthecamewithyou.com/post/Fastest-image-merge-(alpha-blend)-in-GDI2b.aspx
string cacheKey = string.Format("MB_{0}", alpha);
Stopwatch sw = new Stopwatch();
sw.Start();
// for the matrix the range is 0.0 - 1.0
float alphaNorm = (float)alpha / 255.0F;
// just change the alpha
ColorMatrix matrix = new ColorMatrix(new float[][]{
new float[] {1F, 0, 0, 0, 0},
new float[] {0, 1F, 0, 0, 0},
new float[] {0, 0, 1F, 0, 0},
new float[] {0, 0, 0, alphaNorm, 0},
new float[] {0, 0, 0, 0, 1F}});
ImageAttributes imageAttributes = new ImageAttributes();
imageAttributes.SetColorMatrix(matrix);
//create a blank bitmap the same size as original
Bitmap newBitmap = uOriginal.Clone().ToManagedImage();
sw.Stop();
_logger.Trace("MatrixBlend_newBitmap [{0}] takes {1}", cacheKey, sw.Elapsed.ToString());
sw.Restart();
//get a graphics object from the new image
using (Graphics g = Graphics.FromImage(newBitmap))
{
g.CompositingMode = CompositingMode.SourceOver;
g.CompositingQuality = CompositingQuality.HighSpeed;
g.DrawImage(compare,
new Rectangle(0, 0, uOriginal.Width, uOriginal.Height),
0,
0,
compare.Width,
compare.Height,
GraphicsUnit.Pixel,
imageAttributes);
}
sw.Stop();
_logger.Trace("MatrixBlend_drawImage [{0}] takes {1}", cacheKey, sw.Elapsed.ToString());
return newBitmap;
}
