C#2008实现人脸识别：光线补偿与亮度调节

        private void button12_Click(object sender, EventArgs e)
        {
          
            int xres, yres, i, j,k,l,m,n,calnum,total,num,averagegray;
            
            
            Bitmap box1 = new Bitmap(pictureBox1.Image);//图片类

            xres = box1.Width;
            yres = box1.Height;
            total = box1.Width * box1.Height;//面积
            calnum = 0;
            averagegray = 0;
            num = 0;


            const int thresholdnum = 100;
            int [] histogram=new int[256];//图片的灰度表，记录在图片中出现的所有灰度
            const float threshlidco = 0.05f;
            for (i = 0; i < 256; i++) histogram[i]=0;
            if (box1.Width * box1.Height * threshlidco < thresholdnum) return;
            int colorr, colorg, colorb,gray;
            float color;



            Rectangle rt = new Rectangle(0, 0, box1.Width, box1.Height);//设定以矩形，也就是图片边框
            BitmapData dt = box1.LockBits(rt, ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);//内存锁定，以实现unsafe代码
            unsafe