C#圖象灰度級拉伸的辦法。本站提示廣大學習愛好者:(C#圖象灰度級拉伸的辦法)文章只能為提供參考,不一定能成為您想要的結果。以下是C#圖象灰度級拉伸的辦法正文
本文實例講述了C#圖象灰度級拉伸的辦法。分享給年夜家供年夜家參考。詳細以下:
//界說圖象灰度拉伸函數 private static Bitmap GrayLP (Bitmap a) { Rectangle rect = new Rectangle(0, 0, a.Width, a.Height); System.Drawing.Imaging.BitmapData srcData = a.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, a.PixelFormat); IntPtr ptr = srcData.Scan0; int bytes = 0; if (a.PixelFormat == System.Drawing.Imaging.PixelFormat.Format8bppIndexed) { bytes = a.Width * a.Height; } else { bytes = a.Width * a.Height * 3; } byte[] grayValues = new byte[bytes]; System.Runtime.InteropServices.Marshal.Copy(ptr, grayValues, 0, bytes); byte n = 255, m = 0; double p; //盤算最年夜和最小灰度級 for (int i = 0; i < bytes; i++) { //盤算最小灰度級 if (n > grayValues[i]) { n = grayValues[i]; } //盤算最年夜灰度級 if (m < grayValues[i]) { m = grayValues[i]; } } //獲得斜率 p = 255.0 / (m - n); //灰度拉伸 for (int i = 0; i < bytes; i++) { grayValues[i] = (byte)(p * (grayValues[i] - n) + 0.5); } System.Runtime.InteropServices.Marshal.Copy(grayValues, 0, ptr, bytes); a.UnlockBits(srcData); return a; }
願望本文所述對年夜家的C#法式設計有所贊助。