New coding and decoding method for digital level meter
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摘要: 鉴于数字水准测量时，线阵CCD采集信号使视场和分辨率受视距大范围变化的制约，水准仪编解码困难，提出一套新的编解码方案，采用混合编码，基于面阵CCD接收器，利用二维信号的优越性，解决视距太小不能满足条码样本数与视距太大图像分辨率低的矛盾，研究水准测量的技术核心问题，并通过算法优化，达到实时在线测量的要求。测试结果表明，测量范围为2m～10m时，测量绝对误差在-1mm～1mm之间，证明了所提出的编解码方法的正确性与可行性。Abstract: Since the signals were obtained by line CCD in digital level measurement, field range and resolution was restricted because of great changes in viewing distance. It is very difficult for level meter to code and decode. A new coding and decoding method is proposed. Based on area-array CCD, this solution uses mixed coding technology and takes advantage of two-dimensional signal. The tradeoff between a lack of barcode samples when distance is too short and low resolution of image when distance is too long was overcome, and the key technical problem was completely resolved. By optimizing the algorithm, we also achieved real-time online measurement. The results show that measurement of absolute error is between -1mm and 1mm when measuring range is between 2m and 10m, which proved that the proposed method is correct and feasible.
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Keywords:
- digital Level meter /
- area-array CCD /
- mixed coding /
- decoding
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