Compared with the ordinary optimization algorithm of calibration , this algorithm gains simplicity , less computing quantity , and also keeping high accuracy . camera self - calibration is becoming the important field of calibration research . camera self - calibration based on active vision makes the problem simplified taking advantage of controlling camera to do known movement 不需要标定参照物的自标定技术正成为目前摄像机标定研究的重点，其中基于主动视觉的自标定算法可以通过控制摄像机做已知的运动而使问题简化，正在成为当今研究的一个热点。
Our empirical analysis shows that no significant difference can be found between european countries and china from the 16th to mid - 18th century . they almost equaled in the growth rate of population , the efficiency of market , the level of science and technology and even the environment of institutions 首先，笔者用相关资料和数据证明，前工业革命时期欧洲与其参照物中国之间并不存在显著的差异，双方在总体上势均力敌；这种均势主要体现在人口增长规模、人均gdp水平、市场运作状况、技术条件及所处之制度环境等方面。
