A Modeling of Lettuce Growth by System Identification (Part 1)

A Measurement of Identification Output by Image Analysis

Abstract

This research is a fundamental analysis to find a universal model of the plant response to variations of cultivation environments. A transfer function between the photon flux density and the flesh weight of a lettuce, which is a single input-single output model, was derived by using the system identification method. In this report the measurement of the identification output was explained. Using an image analysis, a non-contact and a real time measurement of the flesh weight as the identification output was achieved. Then the continuous measurement with a constant sampling period was realized. Considering the dense planting as well seen in the plant factory, a measurement algorithm, which is applicable to the case of the leaf overlap between the two stocks, was developed.