About Object Tracing

private void timer2_Tick(object sender, EventArgs e)
        {
            Bitmap myBitmap1 = pictureBox1.Image as Bitmap;
            if (myBitmap1 == null)
            {
                timer2.Stop();
            }
            else
            {
                // Here to Get BackGround Image and save to disk
                int[, ,] ImgData1 = GetImgData(myBitmap1);
                GrayProcess(ImgData1);
                GrayThreshold(ImgData1);
                Bitmap ProcessedBitmap1 = CreateBitmap(ImgData1);
                ProcessedBitmap1.Save(@"c:\temp1.jpg");

                delay(1);
                
                // Here to Get another Image and save to disk
                int[, ,] ImgData2 = GetImgData(myBitmap1);
                GrayProcess(ImgData2);
                GrayThreshold(ImgData2);
                Bitmap ProcessedBitmap2 = CreateBitmap(ImgData2);
                ProcessedBitmap2.Save(@"c:\temp2.jpg");
            }

            // Here I try to calculate changed pixel and compare both pictures to find out location
            Bitmap source1 = new Bitmap(@"c:\temp1.jpg");
            Bitmap source2 = new Bitmap(@"c:\temp2.jpg");

            int[, ,] New1 = new int[source1.Width, source1.Height, 3];
            int[, ,] New2 = new int[source2.Width, source2.Height, 3];
            BitmapData byteArray1 = source1.LockBits(new Rectangle(0, 0, source1.Width, source1.Height), 

ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
            BitmapData byteArray2 = source2.LockBits(new Rectangle(0, 0, source2.Width, source2.Height), 

ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
            int ByteOfSkip1 = byteArray1.Stride - byteArray1.Width * 3;
            int ByteOfSkip2 = byteArray2.Stride - byteArray2.Width * 3;
            unsafe
            {
                byte* imgPtr1 = (byte*)(byteArray1.Scan0);
                byte* imgPtr2 = (byte*)(byteArray2.Scan0);
                for (int y = 0; y <byteArray1.Height; y++)
                {
                    for (int x = 0; x < byteArray1.Width; x++)
                    {
                        New1[x, y, 2] = (int)*(imgPtr1);
                        New1[x, y, 1] = (int)*(imgPtr1+1);
                        New1[x, y, 0] = (int)*(imgPtr1+2);
                        New2[x, y, 2] = (int)*(imgPtr2);
                        New2[x, y, 1] = (int)*(imgPtr2 + 1);
                        New2[x, y, 0] = (int)*(imgPtr2 + 2);
                        imgPtr1 += 3;
                        imgPtr2 += 3;

                        int a = New1[x, y, 1];
                        int b = New2[x, y, 1];

                        if (a != b)
                        {

                            //Here to identify the location and circular it out
                            Graphics g = pictureBox1.CreateGraphics();
                            Pen pen = new Pen(Color.Red, 5);
                            int width, height,width1,height1;
                            width = source1.Width;
                            height = source1.Height;
                            width1 = pictureBox1.Size.Width;
                            height1 = pictureBox1.Size.Height;
                            int width_diff, height_diff;
                            width_diff = width1 - width;
                            height_diff = height1 - height;
                            g.DrawRectangle(pen, x, y, width_diff, height_diff);
                            //Refresh();
                        }

                    }
                    imgPtr1 += ByteOfSkip;
                    imgPtr2 += ByteOfSkip;
                }
            }
            source1.UnlockBits(byteArray1);
            source2.UnlockBits(byteArray2);
        }