Accord.Imaging.Filters.Morph.ProcessFilter C# (CSharp) Method

        protected override unsafe void ProcessFilter( UnmanagedImage image, UnmanagedImage overlay )
        {
            // get image dimension
            int width  = image.Width;
            int height = image.Height;

            // initialize other variables
            int pixelSize = ( image.PixelFormat == PixelFormat.Format8bppIndexed ) ? 1 : 3;
            int lineSize  = width * pixelSize;
            int offset    = image.Stride - lineSize;
            int ovrOffset = overlay.Stride - lineSize;
            // percentage of overlay image
            double q = 1.0 - sourcePercent;

            // do the job
            byte * ptr = (byte*) image.ImageData.ToPointer( );
            byte * ovr = (byte*) overlay.ImageData.ToPointer( );

            // for each line
            for ( int y = 0; y < height; y++ )
            {
                // for each pixel
                for ( int x = 0; x < lineSize; x++, ptr++, ovr++ )
                {
                    *ptr = (byte) ( ( sourcePercent * ( *ptr ) ) + ( q * ( *ovr ) ) );
                }
                ptr += offset;
                ovr += ovrOffset;
            }
        }
    }