Estimation of Light-Intercepting Characteristics of Plants Based on Kinect Sensor

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Other Title
  • Kinect（キネクト）の深度情報を利用した作物個体群の受光態勢の評価
  • Kinect(キネクト)ノ シンド ジョウホウ オ リヨウ シタ サクモツ コタイグン ノ ジュコウ タイセイ ノ ヒョウカ

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Abstract

Plant foliage depth data obtained with a Kinect for Windows sensor were used to estimate the light-intercepting characteristics of tomato and paprika plants. As a qualitative measure of plant growth, we calculated plant cover ratios per unit area (Ra), defined as the ratio of the area of a horizontal projection of the foliage for a unit plant to the floor area occupied by the plant. To obtain an additional metric for the light-intercepting characteristics of the plants, termed Rp, Ra values were calculated at 1 cm increments starting from the top of a plant to provide an integrated value, Ra’; Rp was then calculated by taking the distance from the plant top to the point at which the value of Ra’ was 80 % of the Ra value for the plant and dividing this distance by the vertical distance from top to bottom of the plant foliage. Analyses using dummy plants and tomato plants showed that Ra values increased and Rp values decreased as the total foliage area increased and light was less able to penetrate downward through the array of leaves. Changes in leaf angle also affected Ra and Rp values. Dummy plants with their leaves horizontal had larger Ra values and smaller Rp values than when the leaves were inclined downward. A comparison of data at sunrise and sunset for paprika plants cultivated in a greenhouse showed that Ra values were larger and Rp values were smaller at sunrise, compared with their respective values at sunset. These relationships are in agreement with changes in leaf attitudes, which were more horizontal at sunrise and slightly drooped at sunset.

Journal

  • Shokubutsu Kankyo Kogaku

    Shokubutsu Kankyo Kogaku 27 (2), 97-101, 2015

    Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists

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