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基于車載二維激光掃描的樹冠體積在線測量
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林業(yè)局948項目(2015—4—56)、江蘇省人社廳博士后科研計劃項目(KY201503551)和江蘇省產(chǎn)學研聯(lián)合創(chuàng)新資金——前瞻性聯(lián)合研究項目(BY2014006—02)


Online Measurement of Tree Canopy Volume Using Vehicle-borne 2-D Laser Scanning
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    摘要:

    采用車載二維激光掃描儀獲取樹木單側點云數(shù)據(jù),坐標變換后通過設置感興趣區(qū)域檢測樹木,利用垂直分布特性識別樹干,得到樹冠中心距離??紤]樹冠連續(xù)/不連續(xù)2種情況進行樹木分割,將樹冠外緣距離與對應樹干距離相減算出樹冠厚度。將樹冠體積離散化為長方體,利用樹冠厚度、相鄰測量點垂直方向距離、車輛速度、掃描周期等參數(shù)進行計算。采用FIFO緩沖區(qū)保存在線數(shù)據(jù),新采集的一幀數(shù)據(jù)寫入緩沖區(qū)末尾,同時從緩沖區(qū)開頭讀出處理好的數(shù)據(jù)幀輸出,實現(xiàn)樹冠體積的在線測量。實驗結果證明,樹冠連續(xù)/不連續(xù)場景下,方法均能準確檢測分割樹冠、識別樹干,實現(xiàn)樹冠體積的在線測量。

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    An online measurement method of tree canopy volume using vehicle-borne 2-D laser scanning was proposed. Firstly, the point cloud data of trees was obtained by using a vehicle-borne 2-D laser scanner. After coordinate transformation, trees within the region of interest were detected. Then trunks were recognized by using their vertical distribution characteristic and trunk distances were obtained. In the case of canopy continuity, tree segmentation was performed by finding minimum data frame between trunks. Crown thicknesses were computed by subtracting the crown outer edge distances from the corresponding trunk distance. Finally, tree canopy was discretized into small boxes and its volume was computed by using crown thickness, distance between adjacent measuring points in the vertical direction, vehicle speed and scanning circle. To meet the demand for online measurement, data was saved in FIFO buffer which included all information required for the calculation of tree canopy volume. New data frame was written to the end of the buffer and the processed data frame was read from the beginning of the buffer. The experimental results showed that in the continuous and discontinuous canopy scenarios, trees and trunks were detected effectively and tree canopy volume was measured online accurately. In the experiment, the average processing time per frame was 2.0 ms and the maximum processing time was 15.6 ms, which was less than laser scanning period (25ms) and met the needs of real-time processing.

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李秋潔,鄭加強,周宏平,張浩,束義平,徐波.基于車載二維激光掃描的樹冠體積在線測量[J].農(nóng)業(yè)機械學報,2016,47(12):309-314. Li Qiujie, Zheng Jiaqiang, Zhou Hongping, Zhang Hao, Shu Yiping, Xu Bo. Online Measurement of Tree Canopy Volume Using Vehicle-borne 2-D Laser Scanning[J]. Transactions of the Chinese Society for Agricultural Machinery,2016,47(12):309-314.

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  • 收稿日期:2016-09-08
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  • 在線發(fā)布日期: 2016-12-10
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