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 主控制線程實(shí)現(xiàn)整個(gè)編碼端系統(tǒng)的初始化和處理用戶界面?zhèn)飨聛?lái)的控制信息;預(yù)覽線程從編碼系統(tǒng)讀取預(yù)覽數(shù)據(jù)并按照用戶界面?zhèn)飨聛?lái)的要求在屏幕上顯示預(yù)覽視頻;編碼線程從編碼系統(tǒng)讀取編碼數(shù)據(jù)并把數(shù)據(jù)轉(zhuǎn)發(fā)給服務(wù)器進(jìn)程,由服務(wù)器進(jìn)程實(shí)現(xiàn)數(shù)據(jù)的錄象存盤或通過(guò)網(wǎng)絡(luò)向遠(yuǎn)程客戶端傳輸。
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 本文提出了兩次分類錯(cuò)切變形體繪制算法,該算法充分發(fā)掘體數(shù)據(jù)的一致性,首先對(duì)數(shù)據(jù)進(jìn)行第一次分類,對(duì)第一次分類的結(jié)果進(jìn)行行程編碼,實(shí)現(xiàn)了數(shù)據(jù)的壓縮,對(duì)壓縮的體數(shù)據(jù)進(jìn)行第二次分類繪制;同時(shí)依據(jù)兩次分類的特點(diǎn),利用八叉樹進(jìn)行加速,實(shí)現(xiàn)了有效的體繪制算法。
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 現(xiàn)有的即時(shí)通信系統(tǒng)在支持圖形即時(shí)雙向交互方面還存在著如下問(wèn)題: ( 1 )不能支持基于圖形的即時(shí)通信,在即時(shí)通信系統(tǒng)中缺少即時(shí)繪制圖形的環(huán)境,只支持基于文字、文件、語(yǔ)音和視頻的通信; ( 2 )部分支持基于圖形的即時(shí)會(huì)話的系統(tǒng),傳輸?shù)臄?shù)據(jù)是圖像壓縮數(shù)據(jù),單位時(shí)間內(nèi)傳輸?shù)臄?shù)據(jù)量大,不適合在開放互聯(lián)網(wǎng)上廣泛使用。