AForge.Imaging.Filters.IterativeThreshold.CalculateThreshold C# (CSharp) Method

        public int CalculateThreshold( Bitmap image, Rectangle rect )
        {
            int calculatedThreshold = 0;

            // lock source bitmap data
            BitmapData data = image.LockBits(
                new Rectangle( 0, 0, image.Width, image.Height ),
                ImageLockMode.ReadOnly, image.PixelFormat );

            try
            {
                calculatedThreshold = CalculateThreshold( data, rect );
            }
            finally
            {
                // unlock image
                image.UnlockBits( data );
            }

            return calculatedThreshold;
        }