| 摘要 |
<p>Method (200; 300) and portable electronic equipment (100) for determining leaf area index, or LAI, of a plant canopy sample. The equipment is movable with respect to an axis (X) perpendicular to the ground and to (Y) and (Z) axes parallel to the ground and orthogonal to said first axis and it has a digital image acquisition module (40, 102) and an accelerometer module (50). The method of invention comprises the steps of: - positioning (202; 202') said equipment at the plant canopy sample; - rotating (203) said equipment about axis (Y) from a first position, in which a camera lens (102) of said image acquisition module lies on a reference plane (XY), to a second position in which said camera lens (102) lies on a first plane (YZ); - during the rotation of the equipment, detecting, by the accelerometer module (50), the attainment of an intermediate position between the first and second position, in such intermediate position the equipment being inclined with respect to the reference plane (XY) by a reference inclination angle of about 57.5°; - acquiring (204) at least one digital image of said plant canopy sample at the intermediate position of the equipment; - sending (205) said at least one acquired digital image to a processing module (10) in the portable electronic equipment; - processing (206; 206') said at least one digital image to measure a parameter indicative of a light radiation transfer through the plant canopy sample at said reference inclination angle.</p> |
