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基于粒子濾波的蘋果采摘機器人目標姿態(tài)估算
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國家自然科學(xué)基金資助項目(31071325)和中國農(nóng)業(yè)大學(xué)、南京農(nóng)業(yè)大學(xué)青年教師開放科研基金資助項目(NC2008008)


Apple Attitude Estimation Based on Particle Filter for Harvesting Robot
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    摘要:

    針對蘋果采摘機器人中果實姿態(tài)信息缺失造成果實損傷及采摘失敗等問題,根據(jù)蘋果尾部花萼遺跡區(qū)域是否可見分析了果實姿態(tài)信息機器視覺測量方法,研究了果實姿態(tài)信息的粒子濾波估計。將單目攝像機固定在機器人末端手爪上,在手爪趨近果實的采摘過程中,隨機采集多幀果實圖像。對每幀圖像運用慣性主軸或重心點偏移兩種方法計算果實在機器人坐標系下的姿態(tài)向量值,并通過粒子濾波融合來得到果實姿態(tài)信息的最優(yōu)估計。實驗結(jié)果表明,粒子濾波方法可以有效地融合多幀圖像的蘋果姿態(tài)信息,能夠減小因依靠單幀圖像直接測量而產(chǎn)生的誤差。

    Abstract:

    In view of harvesting damages and failures caused by the absence of attitude information in the current apple harvesting robot, the method of measuring apple attitude was put forward with the machine vision, and the optimal estimation of apple attitude was carried out based on the particle filter in real time. A camera was fixed on the robotic gripper, in the process of picking the camera vision field was controlled to cover the expected fruit target, and a series of apple images were sampled randomly. The algorithms of the inertial axis and the center offset were applied to calculate the apple attitude at the robotic coordinate according to the each apple image. Finally, the attitude data extracted from many apple images was fused with the particle filter, and the optimal estimation of the apple attitude was obtained. The experimental results showed that the multiple information of apple attitude was fused successfully, and the measurement error of apple attitude was decreased effectively.

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周俊,張高陽,劉銳,金月.基于粒子濾波的蘋果采摘機器人目標姿態(tài)估算[J].農(nóng)業(yè)機械學(xué)報,2011,42(3):161-165. Zhou Jun, Zhang Gaoyang, Liu Rui, Jin Yue. Apple Attitude Estimation Based on Particle Filter for Harvesting Robot[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(3):161-165.

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