Abstract:
This paper proposes a new method of estimation
of the wet biomass of three floating aquatic plants, Spirodela
polyrhiza, Lemna minor and Azolla pinnata. The method uses a
homogeneity measure known as the J-value to detect the texture
of the fronds of the plants from the uniform water surface. The
proposed method is called J-value thresholding (JVT) and is
highly accurate compared to the alternative green layer extraction
(GLE). The average accuracy under normal illumination for the
proposed method is 91.59% for Spirodela polyrhiza, 80.11% for
Lemna minor and 77.4% for Azolla pinnata. Furthermore, it is
robust to different illumination levels with the Pearson correlation
coefficient of the estimates of different illumination levels being
above 95%. When used to obtain the growth rate of each plant
specie through linear regression, the result from the proposed
method is highly consistent with the ground truth of the image.
