AForge.Imaging.ComplexImage.FromBitmap C# (CSharp) Method

        public static ComplexImage FromBitmap( BitmapData imageData )
        {
            // check image format
            if ( imageData.PixelFormat != PixelFormat.Format8bppIndexed )
            {
                throw new UnsupportedImageFormatException( "Source image can be graysclae (8bpp indexed) image only." );
            }

            // get source image size
            int width  = imageData.Width;
            int height = imageData.Height;
            int offset = imageData.Stride - width;

            // check image size
            if ( ( !Tools.IsPowerOf2( width ) ) || ( !Tools.IsPowerOf2( height ) ) )
            {
                throw new InvalidImagePropertiesException( "Image width and height should be power of 2." );
            }

            // create new complex image
            ComplexImage complexImage = new ComplexImage( width, height );
            Complex[,] data = complexImage.data;

            // do the job
            unsafe
            {
                byte* src = (byte*) imageData.Scan0.ToPointer( );

                // for each line
                for ( int y = 0; y < height; y++ )
                {
                    // for each pixel
                    for ( int x = 0; x < width; x++, src++ )
                    {
                        data[y, x].Re = (float) *src / 255;
                    }
                    src += offset;
                }
            }

            return complexImage;
        }