Games like quake have graphics engines tuned for specific angles and types of images ; they are not general - purpose 3d rendering engines 诸如quake之类的游戏的引擎针对特定的角度和图像类型进行了优化；它们并不是通用的3d呈现引擎。
None of the current still - image compression and coding standards can match all the new requirements of image processing , such as compression , roi coding , robustness , different types of still images , interactivity , security , expansion and open architecture . however , by using new techniques and depending on its new features , jpeg 2000 can address all the needs 本文的立题意义在于利用jpeg2000具有的特性和采用的新技术，解决包括这些压缩、 roi编码、健壮性、多种图像类型、交互性、安全性、可扩充性和开放性等新的图像应用领域的不同需求。
3 . the coder class is defined introducing the object oriented programming , the important member function is realized such as the beginning and end of coding , the getting of image type , the conversion of image type etc . according to the bandwidth of different users , the bitrate is adjusted and the algorithm is simulatively realized 采用面向对象的程序设计思想和方法，定义了编码器类，给出了重要成员函数如编码开始、编码结束、获取图像类型、图像类型转换的程序实现；根据用户带宽的不同，调整编码时用到的位率并且进行了程序的模拟实现。
