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基于邊緣曲率分析的重疊番茄識別
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國家高技術(shù)研究發(fā)展計劃(863計劃)資助項目(2006AA10Z257);國家自然科學(xué)基金資助項目(61105024)


Recognition of Overlapping Tomatoes Based on Edge Curvature Analysis
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    為提高重疊番茄的識別正確率,提出了一種基于邊緣曲率分析的重疊番茄識別方法。該方法從二值圖像中提取番茄區(qū)域的邊緣,并且為進(jìn)一步計算出邊緣點曲率,對邊緣點按逆時針方向進(jìn)行排序。計算出邊緣點曲率后,剔除掉曲率異常的邊緣點。最后通過對各剩余邊緣分別進(jìn)行圓回歸,實現(xiàn)重疊番茄的識別。為減小作業(yè)環(huán)境光照變化及枝葉遮擋等因素給識別帶來的影響,采用了基于歸一化色差的固定閾值分割方法,6條邊緣識別準(zhǔn)則及3條圓回歸準(zhǔn)則。119幅圖像的試驗結(jié)果表明,存在輕微遮擋的重疊番茄識別正確率為90.9%;遮擋率大于25%且小于50%時,識別正確率為76.9%;遮擋率大于50%時,識別正確率為23%。

    Abstract:

    In order to improve the recognition accuracy, a method of overlapping tomatoes recognition based on curvature analysis of edge points was presented. Edges of tomatoes were extracted from binary image at first. Then curvature values could be acquired after edge points were sorted counterclockwise. The edge points with abnormal curvature values were abandoned. After circle regression for remaining edges, overlapping tomatoes could be recognized. In order to decrease the negative impact on recognition aroused from environmental lighting variation and occlusion caused by leaves and branches, threshold segmentation method based on normalization aberration, 6 rules for edge recognition and 3 rules for circle regression were adopted. The experimental results of 119 images showed that the recognition accuracy for overlapping tomatoes with slight occlusion was 90.9%, it was 76.9% when the occlusion rate was between 25% and 50%, and it was 23% when the occlusion rate was larger than 50%.

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項榮,應(yīng)義斌,蔣煥煜,饒秀勤,彭永石.基于邊緣曲率分析的重疊番茄識別[J].農(nóng)業(yè)機(jī)械學(xué)報,2012,43(3):157-162. Xiang Rong, Ying Yibin, Jiang Huanyu, Rao Xiuqin, Peng Yongshi. Recognition of Overlapping Tomatoes Based on Edge Curvature Analysis[J]. Transactions of the Chinese Society for Agricultural Machinery,2012,43(3):157-162.

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  • 在線發(fā)布日期: 2012-03-17
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