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農(nóng)田圖像采集與無線傳輸系統(tǒng)設(shè)計
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國家高技術(shù)研究發(fā)展計劃(863計劃)資助項目（2008AA10Z226）


Design on System of Acquisition and Wireless Transmission for Farmland Image
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    摘要:

    結(jié)合ZigBee和GPRS，設(shè)計了農(nóng)田圖像采集與無線傳輸系統(tǒng)。系統(tǒng)由MESH型ZigBee圖像采集網(wǎng)絡(luò)和遠(yuǎn)程服務(wù)器構(gòu)成，服務(wù)器與ZigBee網(wǎng)絡(luò)的協(xié)調(diào)器通過GPRS網(wǎng)絡(luò)進(jìn)行數(shù)據(jù)傳輸。基于V4L技術(shù)采集了農(nóng)田圖像，闡述了JPEG壓縮和解壓縮流程，使用改進(jìn)的離散余弦變換減小了圖像壓縮的運(yùn)算量，并對壓縮后的圖像作了數(shù)據(jù)分組和校驗，保證了數(shù)據(jù)傳輸?shù)目煽啃?。在選定農(nóng)田對系統(tǒng)進(jìn)行實地測試，系統(tǒng)能夠順利采集圖像，無線傳輸成功率為76%，同時分析了傳輸一幅圖像的理論最短時間和實際平均傳輸時間產(chǎn)生的差異。

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    Based on ZigBee and GPRS, a system was designed to acquire farmland images and transfer the images wirelessly. The system consisted of MESH-type ZigBee network for image acquisition and a remote server which could communicate with the ZigBee network coordinator via GPRS network. The image acquisition based on the V4L technology was introduced first, and the process of JPEG compression and decompression was described, the method of reducing the computational complexity of image compression by the improved discrete cosine transform (DCT) was studied, then how to improve reliability in the data transmission by partitioning and checking image data was discussed. At last, the system was tested in the given field and it proved that the successful rate of farmland image acquisition was 76%. Furthermore, the difference between the theoretical and practical transmission time was analyzed.

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熊迎軍,沈明霞,孫玉文,徐友,林相澤.農(nóng)田圖像采集與無線傳輸系統(tǒng)設(shè)計[J].農(nóng)業(yè)機(jī)械學(xué)報,2011,42(3):184-187. Xiong Yingjun, Shen Mingxia, Sun Yuwen, Xu You, Lin Xiangze. Design on System of Acquisition and Wireless Transmission for Farmland Image[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(3):184-187.

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