private void button5_Click(object sender, EventArgs e)
        {
            Image <Gray, byte>[] selfCheckImageList = db.getTrainedImageList();
            int[] selfCheckLabel = db.getAllImageID();
            int   count          = 0;

            foreach (var image in selfCheckImageList)
            {
                string[] matchedData = imageCheckRecognize(image);
                db.updateSelfChecking(matchedData[0], matchedData[1], selfCheckLabel[count].ToString());
                count++;
            }
            MessageBox.Show("Self Checking Finished.");
        }