Application program mainly contains a multi - thread program , including main control thread , preview thread and encoding thread . main control thread initializes encoder end system and deals with control message delivered from user interface ; preview thread reads preview data and displays it on the screen by the way of user ’ s request ; encoding thread reads encoded data and transfers it to server process . according to user ’ s requirement , server saves the encoded data or transfers it to client by network 主控制线程实现整个编码端系统的初始化和处理用户界面传下来的控制信息;预览线程从编码系统读取预览数据并按照用户界面传下来的要求在屏幕上显示预览视频;编码线程从编码系统读取编码数据并把数据转发给服务器进程,由服务器进程实现数据的录象存盘或通过网络向远程客户端传输。
In the thesis a volume rendering algorithm is put forward using shear - warp factorization of the viewing transformation and two - pass classification , it utilizes the coherence of volume data , classifies the data for the first pass and encodes the volume data using a run encoding , the encoded data is classified for the second pass when it is rendered . using the feature for two pass classification , it uses octree data structure speed up the rendering , realizes a very good volume rendering algorithm 本文提出了两次分类错切变形体绘制算法,该算法充分发掘体数据的一致性,首先对数据进行第一次分类,对第一次分类的结果进行行程编码,实现了数据的压缩,对压缩的体数据进行第二次分类绘制;同时依据两次分类的特点,利用八叉树进行加速,实现了有效的体绘制算法。
However , there are some questions about instant messenger : firstly , instant messengers existed ca n ' t support to draw instantly graphs for communicating with others because there is no environment to draw graphs in the local computer in instant messengers . secondly , or can do it , but for transferring too large picture encode data , the instant messengers are only running in local area networks , not in internet 现有的即时通信系统在支持图形即时双向交互方面还存在着如下问题: ( 1 )不能支持基于图形的即时通信,在即时通信系统中缺少即时绘制图形的环境,只支持基于文字、文件、语音和视频的通信; ( 2 )部分支持基于图形的即时会话的系统,传输的数据是图像压缩数据,单位时间内传输的数据量大,不适合在开放互联网上广泛使用。