Imaging Systems

Development of a multispectral imaging prototype for real-time detection of apple fruit firmness

[+] Author Affiliations
Renfu Lu

U.S. Department of Agriculture, Agricultural Research Service, Michigan State University,224 Farrall Hall, East Lansing, Michigan 48824

Yankun Peng

China Agricultural University (East Campus),College of Engineering, Number 17 Qinghua East Road, Haidian District, Beijing 100083, China

Opt. Eng. 46(12), 123201 (December 07, 2007). doi:10.1117/1.2818812
History: Received December 07, 2006; Revised May 22, 2007; Accepted July 10, 2007; Published December 07, 2007
Text Size: A A A

Multispectral scattering is a promising nondestructive technique for assessing the firmness of fruit. We report on the development of a laser-based multispectral imaging prototype for real-time detection of apple firmness. The prototype consists of a common aperture multispectral imaging unit, a specially designed multilaser unit, and a fruit handling unit, which simultaneously capture and process four spectral scattering images at a speed up to two fruit per second. The multispectral imaging system is tested for detecting the firmness of Golden Delicious and Red Delicious apples at a rate of one fruit every two seconds. The original 2-D scattering images are corrected by removing noise pixels and incorporating fruit size into the calculations of the scattering distance and intensity. The 1-D scattering profiles are fitted with a four-parameter Lorentzian distribution function. Multilinear regression models are developed using the four Lorentzian parameters for the four wavelengths to predict the firmness of apples. The multispectral imaging system achieves good firmness predictions with the correlation coefficient of 0.86 for both Golden Delicious and Red Delicious. The technique is fast and relatively easy to implement, and has the potential to meet the requirement for online sorting and grading of apples.

Figures in this Article
© 2007 Society of Photo-Optical Instrumentation Engineers

Citation

Renfu Lu and Yankun Peng
"Development of a multispectral imaging prototype for real-time detection of apple fruit firmness", Opt. Eng. 46(12), 123201 (December 07, 2007). ; http://dx.doi.org/10.1117/1.2818812


Tables

Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

PubMed Articles
Advertisement

 

 

  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.