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黃瓜采摘機(jī)器人遠(yuǎn)近景組合閉環(huán)定位方法
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國家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃)資助項(xiàng)目(2007AA04Z222)和高等學(xué)校博士點(diǎn)專項(xiàng)科研基金資助項(xiàng)目(200800191014)


Feedback Locating Control Based on Close Scene for Cucumber Harvesting Robot
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    摘要:

    針對(duì)黃瓜采摘機(jī)器人遠(yuǎn)景定位精度不高,以致切傷果實(shí)和莖蔓的問題,設(shè)計(jì)了一種基于機(jī)器視覺具有空間位置反饋功能的末端執(zhí)行器。對(duì)溫室環(huán)境下黃瓜果實(shí)采摘區(qū)域圖像信息獲取方法加以研究,綜合HIS色彩空間H、S分量進(jìn)行閾值分割,結(jié)合RGB色彩空間G通道邊緣分布特征以及黃瓜形狀特征,提取黃瓜采摘區(qū)域?;跀z像機(jī)線性透視模型,研究了采摘切割點(diǎn)空間定位方法,最終向采摘機(jī)械臂控制器反饋位置微調(diào)信息。采用遠(yuǎn)近景組合閉環(huán)定位方法,對(duì)采摘目標(biāo)進(jìn)行閉環(huán)定位,有效地解決了采摘機(jī)器人一次遠(yuǎn)景定位誤差較大的問題。試驗(yàn)結(jié)果表明,排除溫室復(fù)雜光照情況,機(jī)器人末端執(zhí)行器定位精度達(dá)到2mm,滿足采摘作業(yè)要求。

    Abstract:

    In order to improve locating accuracy of cutting point and avoid injury of fruit and stem for cucumber harvesting robot, an end-effector with special position feedback was developed based on machine vision. As the differences of H and S distribution on HIS space between cucumber and background, the thresholds was used for image segmentation. Subsequently, the region for robotic harvesting was extracted with edge detection on G channel of RGB space and shape features analysis. Upon the data from the firstlylocating system, the spatial coordinate of the cutting point was acquired with respect to the model of linear projection. The position correction was fed back to the robot controller. The results showed that the maximum error for the cutting point location was less than 2mm, which met the demands of the robotic harvesting operation.

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馮青春,袁 挺,紀(jì) 超,李 偉.黃瓜采摘機(jī)器人遠(yuǎn)近景組合閉環(huán)定位方法[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2011,42(2):154-157. Feng Qingchun, Yuan Ting, Ji Chao, Li Wei. Feedback Locating Control Based on Close Scene for Cucumber Harvesting Robot[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(2):154-157.

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