Journal of Biosystems Engineering

Korean Society for Agricultural Machinery (한국농업기계학회)
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Apple Quality Measurement Using Hyperspectral Reflectance and Fluorescence Scattering

하이퍼 스펙트랄 반사광 및 형광 산란을 이용한 사과 품질 측정

  • Noh, Hyun-Kwon (Dept. of Biosystems Engineering, Chungbuk National University) ;
  • Lu, Renfu (Sugarbeet and Bean Research Unit in EastLansing)
  • Published : 2009.02.25
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Abstract

Hyperspectral reflectance and fluorescence scattering have been researched recently for measuring fruit post-harvest quality and condition. And they are promising for nondestructive detection of fruit quality. The objective of this research was to develop a model, which measure the quality of apple by using hyperspectral reflectance and fluorescence. A violet laser (408 nm) and a quartz tungsten halogen light were used as light sources for generating laser induced fluorescence and reflectance scattering in apples, respectively. The laser induced fluorescence and reflectance of 'Golden Delicious' apples were measured by using a hyperspectral imaging system. Fruit firmness, soluble solids and acid content were measured using standard destructive methods. Principal component analyses were performed to extract critical information from both hyperspectral reflectance and fluorescence data and this information was then related to fruit quality indexes. The fluorescence models had poorer predictions of the three quality indexes than the reflectance models. However, the prediction models of integrating fluorescence and reflectance performed consistently better than the individual models of either reflectance or fluorescence. The correlation coefficient for fruit firmness, soluble solid content, and tillable acidity from the integrated model was 0.86, 0.75, and 0.66 respectively. Also the standard errors were 6.97 N, 1.05%, and 0.07% respectively.

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References

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