C#getPixel和記憶體法讀取灰階圖資訊

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getPixel方法：

        private int getPixels(Bitmap bmpobj)        {            int[,] data = new int[1920, 1200];            int max = 0;            for (int i = 0; i < bmpobj.Height; i++)            {                for (int j = 0; j < bmpobj.Width; j++)                {                    Color b = bmpobj.GetPixel(j, i);                    if (max < b.R)                    {                        max = b.R;                    }                }            }            return max;        }

 

記憶體法：

private int GetImgInfo(Bitmap a)        {            Bitmap src = new Bitmap(a);            int w = src.Width;            int h = src.Height;            int max = 0;            BitmapData srcData = src.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);            unsafe            {                byte* p = (byte*)srcData.Scan0;                int gray = 0;                for (int j = 1; j < h - 1; j++)                {                    for (int i = 1; i < w - 1; i++)                    {                        gray = p[0] ;//+= (p[0] + p[1] + p[2]) / 3;                        p += 4;                        if (max < gray)                        {                            max = gray;                        }                    }                    p += srcData.Stride - w * 4;                }                src.UnlockBits(srcData);                return  max ;            }        }

 

C#getPixel和記憶體法讀取灰階圖資訊