JPH04357441A - Apparatus for evaluating crops in greenhouse - Google Patents

Abstract

PURPOSE:To evaluate the optimum harvesting period of crops by quantifying a growing state by spectrally diffracting the reflected lights from the surfaces of crops to grasp the growing state of crops on the basis of the frequency components of the spectrally diffracted spectra. CONSTITUTION:The reflected lights from the surfaces of crops are incident to a prism 2 through a slit 1 and spectrally diffracted at every spectrum to be taken in a photodetector 3, for example, a CCD. The spectra are converted to digital data to be once stored in a memory 5 and the output from the memory 5 is normalized by the normalization circuit of an operation part 6. The spectrum data thus inputted are integrated with respect to a predetermined wavelength region by an integrating circuit in order to be allowed to correspond to R, G, B values being the three primary colors of light. Since this result of color separation is converted to R, G, B values, output data is high in reproducibility and becomes simple data and, when the growing state of crops is formed, the growing state can be quantified and the optimum harvesting period can be simply evaluated within a real time.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a greenhouse crop evaluation system that evaluates the optimum harvest time of crops by quantifying the growth status of the crops.

0002

[Prior Art] Regarding methods of growing crops in greenhouses, automation of temperature adjustment and watering has been successful in terms of reducing labor. Currently, evaluations rely on trained personnel. However, there have been problems such as a decrease in the number of farmers and the complexity and oversight of human evaluation of the growing status of all crops each time.

0003

[Problem to be solved by the invention] This invention was devised to solve these conventional problems, and by making it possible to quantify the growth status, it is possible to evaluate the optimal harvest time of crops, etc. The purpose is to provide an evaluation device for greenhouse crops.

0004

[Means for Solving the Problems] A greenhouse crop evaluation device according to the present invention spectrally reflects light reflected from the crop surface and determines the crop growth status based on the frequency components of the spectra. It is used to determine the appropriate harvest time, etc.

[0005]

[Embodiment] Next, one embodiment of the evaluation device according to the present invention will be explained based on the drawings. FIG. 1 is a block diagram of the present invention, including a slit 1, a prism 2, a CCD camera 3, and a
First, it consists of a /D converter 4, a memory 5, and an arithmetic unit 6.
The reflected light from the surface of the crop to be evaluated enters the prism through a slit and is separated into spectra. FIG. 2 is a table showing the wavelength and intensity of the separated spectra. The separated spectrum is then transmitted to a light receiving element, such as a CC
It is taken into D.

[0006] Since this captured spectrum is analog information, it is converted into digital information to enable subsequent calculations. This information is temporarily stored in memory, and the output from this memory is normalized by the normalization circuit of the arithmetic unit. This normalization makes it possible to obtain accurate color data even if there are changes in the incident light level itself, such as differences between sunny days and cloudy days.

[0007] In order to associate the spectrum data input in this way with R, G, and B values, which are the three primary colors of light,
It is integrated over a predetermined wavelength region by an integrating circuit. The range of this integral is set as shown in Figure 2, and is so-called R
, G, and B in a predetermined range centered on the wavelengths.

[0008] Color separation using dichroic mirrors and color filters, which is normally performed in color cameras, has low reliability in color measurement due to the low precision of these optical systems and large variations in performance. Color separation using a prism is highly reliable. Then, the results of this color separation are converted into R, G, and B values, so the output data is highly reproducible and simple data, and the growing status of crops,
For example, by creating a comparison table with maturity level, etc., it is possible to quantify the growth status. This makes it possible to judge the growth status of crops without requiring any skill, and can contribute to automation of greenhouse management.

[0009]

[Effects of the Invention] As described above, according to the present invention, by quantifying the growth status of crops, it is possible to easily evaluate the optimum time for harvesting in real time, and there is no need for people to constantly monitor the growth status of crops. It is possible to obtain the effect of reducing labor without

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of an evaluation device according to the present invention.

FIG. 2 is a diagram showing integration ranges centered on R, G, and B wavelengths.

[Explanation of symbols]

2 Prism 3 CCD camera (light receiving element)

Claims (1)

[Claims] 1. A prism that separates light reflected from the surface of crops in a greenhouse, a plurality of light receiving elements that receive each frequency component of the separated spectrum, and a normalization circuit that normalizes the output of each light receiving element. , and an integration circuit that integrates the output of the normalization circuit for each range corresponding to the three primary colors of light.