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基于雙目立體視覺的苗期玉米株形測
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of Maize Seedling Morphological Traits Based on Binocular Stereovision
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    摘要:

    將田間正常生長的待測玉米植株帶土移至測定臺(tái)上，標(biāo)定雙目立體視覺系統(tǒng)，提取、分割葉片圖像，以Douglas-Peucker多邊形法逼近葉片邊緣,去除兩幅對應(yīng)圖像中沒有匹配關(guān)系的多邊形頂點(diǎn)，結(jié)合投影矩陣計(jì)算出葉片邊緣點(diǎn)的三維坐標(biāo)。分別投影葉片邊緣點(diǎn)到植株平面和植株水平平面，對投影的離散點(diǎn)分段二次擬合、Cardinal樣條插值，得到代表葉片形狀的曲線，計(jì)算出葉長、葉片著生高度、莖葉夾角、葉片方位角等株形指標(biāo)。測量實(shí)驗(yàn)表明，本方法快速、準(zhǔn)確、自動(dòng)化程度高，能夠滿足苗期玉米株形測量的要求。

    Abstract:

    Field-growing maize seedling was transplanted onto measuring board with soil reserved. Images of plant were captured with calibrated binocular stereovision system. The binary images were extracted and segmented into leaves and stems according to phyllotaxis. An algorithm of Douglas-Peucker polygonal approximation of leaf contour was applied to find matching points of two corresponding images. Projecting 3-D points of maize seedling onto plant plane and plant horizontal plane, fitting and interpolating the projected points to generate leaf curve so that the leaf length, leaf insertion height, azimuth and inclination angle could be calculated.

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王傳宇,趙明,閻建河.基于雙目立體視覺的苗期玉米株形測[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2009,40(5):145-148. of Maize Seedling Morphological Traits Based on Binocular Stereovision[J]. Transactions of the Chinese Society for Agricultural Machinery,2009,40(5):145-148.

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