中文说明：
半色调技术对图像进行打印和显示。半色调技术是一种基于点模式的灰度级图像打印方案。在本实验中，给出了用点模式近似表示的10个灰度级
English Description：
Halftone technology prints and displays images. Halftone technology is a gray level image printing scheme based on point mode. In this experiment, 10 gray levels approximately represented by point mode are given