简版的雷电，OpenGL所编写，用方向键控制方向，空格控制发射-Simplified version of the lightning, OpenGL written, with the arrow keys to control direction, space launch control

实现了球体在左上角点以45度角运行，可以发射多颗球体，并相撞四围墙壁的反弹。-The ball in the upper left point run to a 45-degree angle, you can launch multiple satellites sphere collided all around the walls rebound.

NL-MEANS图像去噪算法。 该算法对于灰度图像的高斯白噪声的去除效果极好，但是在计算时间上耗时较高。本程度对于256*256的灰度图像，约在30s以上。 运行，请输入“main”。-NL-means algorithm is a good way for grey image denoising on AWN, but it has high cost on the computation. The program here may cost beyond 30s for 256