Method for obtaining leaf area index and average leaf inclination of rice canopy by using hemisphere photographic process
A technology of leaf area index and leaf inclination angle, which is applied in image data processing, instrumentation, calculation, etc., can solve the problems of difficulty in obtaining results quickly and accurately in real time, time-consuming and labor-intensive problems, etc.
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[0019] In the selected fields, 8 shooting plots of 1m×1m were set up according to the "S" shape distribution, with an average of 36 rice plants in each plot. Choose early rice, late rice and single-cropping rice as the shooting objects. Shoot once a week during the growing season of each season of rice, and shoot 5-7 times per rice season.
[0020] 1) Take the image of the rice canopy hemisphere:
[0021] Place the fisheye camera at the center of each plot, keep it horizontal, and shoot upwards; choose cloudy or sunny days when the sun is blocked by clouds; rotate the camera horizontally, take a picture every 45°, every A total of 8 hemispherical images of the rice canopy were obtained for each plot; the average value of the porosity obtained by processing these 8 images was used as the basic data for inversion of canopy structure parameters.
[0022] 2) Color image grayscale conversion:
[0023] The conversion formula uses:
[0024] Gray (x, y) = B (x, y) (1)
[0025] In...
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