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针对我国农田作物生长状况需大量人力监测的问题,以大麦农田为试验对象,设计一种大麦田间视频采集的无线传输系统。主要对视频图像的采集与传输进行了理论分析和设计,通过田间试验对结果进行验证。相关分析结果表明,本系统采用的有损压缩算法(Discrete cosine transform,DCT),在1 000m以内传输时间<70ms,数据包发送成功率>98%,与农田监控直送系统采用的无损压缩算法(Differential pulse-code modulation,DPCM)相比,在相同传输距离下,数据量小,传输时间短,传输成功率高,具有较好的实时性和稳定性;而且成本低、体积小、易于安装,可实现对大麦生长视频信息的自动采集及无线传输。
Aiming at the problem of a large amount of manpower monitoring in the growth of cropland in our country, taking barley farmland as test object, we design a wireless transmission system of barley video capture. Mainly on the video image acquisition and transmission of a theoretical analysis and design, field test results to verify. The results of the correlation analysis show that the proposed system uses a DCT (Discrete Cosine Transform) with transmission time less than 1 000 m <70 ms and packet transmission success rate> 98%. Compared with the lossless compression algorithm Differential pulse-code modulation, DPCM), the data transmission rate is small, the transmission time is short, and the transmission success rate is high, which has good real-time and stability under the same transmission distance. Moreover, the method has the advantages of low cost, Barley can achieve the growth of video information automatically capture and wireless transmission.