摘要：
Research of H. 263 video capture and transmission based on ZigBee realized H. 263 video capture and transmission. The hardware of H.263 video capture and transmission based on ZigBee consisted of CC2430, CH375,drive-free USB camera and power,etc. CH375 requested the drive-free USB camera for video capture as USB-HOST model,and acquires the video data or- . ganization and video format,then sents to CC2430 at asynchronous DART model,MCU 8051 in CC243O converted the video formate to H.263 standard. These video signals were transferred at ZigBee wireless network. After making image test about bit-rate, MSE and PSNR parameters, in the indoor 20-meter distance and barrier-free environment on QCIF image format and CIF image format of H. 263 standard with different frame rate,the results show that the video transmission is effective and stable.%基于ZigBee的H.263標準視頻采集傳輸研究實現(xiàn)H.263標準的無線視頻采集傳輸功能.由無線收發(fā)模塊( CC2430)、USB接口(CH375)、免驅(qū)USB攝像頭和電源等構(gòu)成基于ZigBee的H.263標準視頻采集傳輸硬件.CH375芯片以主機方式請求免驅(qū)USB攝像頭進行視頻采集,荻取視頻數(shù)據(jù)的組織及視頻格式,以異步UART模式傳送給CC2430芯片,由CC2430芯片自帶的8051微處理器將視頻格式轉(zhuǎn)換成H.263標準,通過ZigBee網(wǎng)絡無線傳輸.經(jīng)過在室內(nèi)測試距離為20m的無障礙環(huán)境中對H.263標準的QCIF和CIF圖像格式以不同的幀速進行比特率、MSE和PSNR等3個參數(shù)的畫面測試,結(jié)果表明視頻傳輸有效、穩(wěn)定.
摘要：
提出一種以Nios Ⅱ軟核處理器為核心,利用SOPC技術(shù)構(gòu)建硬件平臺,采用H.263協(xié)議壓縮視頻數(shù)據(jù)的網(wǎng)絡視頻監(jiān)控系統(tǒng)設(shè)計方案；詳細分析了系統(tǒng)的功能需求,確定了系統(tǒng)設(shè)計的總體方案；按照模塊化的思想,設(shè)計了各個功能模塊,并給出了網(wǎng)絡芯片DM9000A電路的具體實現(xiàn),利用μClinux中的TCP/IP協(xié)議棧進行數(shù)據(jù)通信,分析H.263視頻編碼協(xié)議基本原理,提出在硬件上實現(xiàn)H.263協(xié)議的設(shè)計方法;實驗結(jié)果顯示系統(tǒng)的網(wǎng)絡視頻傳輸速率達到25～30fps,滿足實時性的要求.本設(shè)計方法靈活、成本較低、易擴展,具有一定的實用價值.%A design plan was provided tor the network video momtonng system centered on Nios II sott processor, used SOPC technology to build hardware platform, adopted H. 263 protocol to compress video data. The overall design of system was decided by analyzing the functional requirements. The function modules were designed by the thought of modularization, and the implementation of network chip DM9000A was illustrated. The implementation of information data transmission method was presented by using the μClinux TCP/IP protocol. The hardware implementation of H. 263 protocol was illustrated by analyzing fundamentals. The result shows that the transmission rate of video data is up to 25～30fps, and meets the requirement of real time. This method is very flexible, cost low, easy to expand, and has certain practical value.
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