Low-cost hyper-spectral imaging system using a linear variable bandpass filter for agritech applications

Appl Opt. 2020 Feb 10;59(5):A167-A175. doi: 10.1364/AO.378269.

Abstract

Hyperspectral imaging for agricultural applications provides a solution for non-destructive, large-area crop monitoring. However, current products are bulky and expensive due to complicated optics and electronics. A linear variable filter was developed for implementation into a prototype hyperspectral imaging camera that demonstrates good spectral performance between 450 and 900 nm. Equipped with a feature extraction and classification algorithm, the proposed system can be used to determine potato plant health with ∼88% accuracy. This algorithm was also capable of species identification and is demonstrated as being capable of differentiating between rocket, lettuce, and spinach. Results are promising for an entry-level, low-cost hyperspectral imaging solution for agriculture applications.

MeSH terms

  • Algorithms
  • Biosensing Techniques / instrumentation
  • Biosensing Techniques / methods
  • Calibration
  • Crops, Agricultural / metabolism*
  • Hyperspectral Imaging / instrumentation*
  • Hyperspectral Imaging / methods*
  • Light
  • Membranes, Artificial
  • Microwaves
  • Niobium / chemistry
  • Optical Devices / economics*
  • Oxides / chemistry
  • Oxygen / chemistry
  • Plant Leaves / metabolism*
  • Plasma Gases / chemistry
  • Refractometry
  • Silicon / chemistry
  • Spectrum Analysis
  • Surface Properties

Substances

  • Membranes, Artificial
  • Oxides
  • Plasma Gases
  • Niobium
  • Oxygen
  • Silicon