[函数名称]

图像非线性变换函数NonlinearTransformProcess(WriteableBitmap src,int k ) 

[函数代码]

        /// <summary>

        /// Nonlinear transform process.

        /// </summary>

        /// <param name="src">The source image.</param>

        /// <param name="k">Param to adjust nonlinear transform, from 0 to 255.</param>

        /// <returns></returns>

        public static WriteableBitmap NonlinearTransformProcess(WriteableBitmap src,int k )////37

        {

            if (src != null)

            {

                int w = src.PixelWidth;

                int h = src.PixelHeight;

                WriteableBitmap linearImage = new WriteableBitmap(w, h);

                byte[] temp = src.PixelBuffer.ToArray();

                int r = 0, g = 0, b = 0;

                for (int i = 0; i < temp.Length; i += 4)

                {

                    b = (int)(k * Math.Log10(1 + temp[i]));

                    g = (int)(k * Math.Log10(1 + temp[i + 1]));

                    r = (int)(k * Math.Log10(1 + temp[i + 2]));

                    temp[i] = (byte)(b > 0 ? (b < 255 ? b : 255) : 0);

                    temp[i + 1] = (byte)(g > 0 ? (g < 255 ? g : 255) : 0);

                    temp[i + 2] = (byte)(r > 0 ? (r < 255 ? r : 255) : 0);

                }

                Stream sTemp = linearImage.PixelBuffer.AsStream();

                sTemp.Seek(0, SeekOrigin.Begin);

                sTemp.Write(temp, 0, w * 4 * h);

                return linearImage;

            }

            else

            {

                return null;

            }

        }