An illumination system for machine vision inspection of agricultural products

Naoshi Kondo, Kazuhiko Namba, Kentaro Nishiwaki, Peter P. Ling, Mitsuji Monta

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

An effect of PL filter on imaging that eliminates halation on object surface is well known. However, it has not been easy to use the filter in front of halogen, incandescent, or HID lamps which radiate a lot of heat, because PL film is melted with a temperature of about 60 degree centigrade. Although fluorescence lamps or LEDs can be used with PL filters, their intensity and color rendering are inferior to them. Diffusers or domes with reflection plates are often used when halogen lamps are used, but unavoidable halation and surroundings reflection occur on glossy surface. In this presentation, a direct lighting device (called DL) developed for fruit grading systems is introduced. DL mainly consisted of a PL filter, two heat absorption filters, a halogen lamp, and a fan. Since the absorption wavelength bands of the two filters were different, major heat did not reach the PL filter. In addition, cold air was introduced to the PL filter by its fan. Most parts of plants have cuticular layers on their surfaces to keep moisture within themselves. In this study, three categories are created for objects corresponding to degree of gloss on surfaces and surface materials: Category 1 (apples, tomato, eggplants, bell peppers), category 2 (pear, kiw peach), and category 3 (potatoes, radish). A color CCD camera was set at the top of object with four DLs and images were acquired. To compare the PL filtering images, a dome and diffusers were also used for the image acquisition. From experiments through three types of illumination devices, it was observed that PL filtering images not only could eliminate halation on products of the category 1 but also could express true colors of the products. Microscopic images showed proportional relation between thickness of cuticular layers and halation on surfaces.

Original languageEnglish
Title of host publication2006 ASABE Annual International Meeting
Publication statusPublished - 2006
Event2006 ASABE Annual International Meeting - Portland, OR, United States
Duration: Jul 9 2006Jul 12 2006

Other

Other2006 ASABE Annual International Meeting
CountryUnited States
CityPortland, OR
Period7/9/067/12/06

Fingerprint

Halogens
computer vision
agricultural products
Lighting
lighting
Color
Hot Temperature
halogens
Solanum melongena
diffusers
Raphanus
Pyrus
Equipment and Supplies
Capsicum
fans (equipment)
Malus
Lycopersicon esculentum
Solanum tuberosum
heat
color

Keywords

  • Agricultural product
  • Cuticular layer
  • Halation
  • Halogen lamp
  • Image
  • Machine vision
  • Polarizing filter

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

Cite this

Kondo, N., Namba, K., Nishiwaki, K., Ling, P. P., & Monta, M. (2006). An illumination system for machine vision inspection of agricultural products. In 2006 ASABE Annual International Meeting

An illumination system for machine vision inspection of agricultural products. / Kondo, Naoshi; Namba, Kazuhiko; Nishiwaki, Kentaro; Ling, Peter P.; Monta, Mitsuji.

2006 ASABE Annual International Meeting. 2006.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kondo, N, Namba, K, Nishiwaki, K, Ling, PP & Monta, M 2006, An illumination system for machine vision inspection of agricultural products. in 2006 ASABE Annual International Meeting. 2006 ASABE Annual International Meeting, Portland, OR, United States, 7/9/06.
Kondo N, Namba K, Nishiwaki K, Ling PP, Monta M. An illumination system for machine vision inspection of agricultural products. In 2006 ASABE Annual International Meeting. 2006
Kondo, Naoshi ; Namba, Kazuhiko ; Nishiwaki, Kentaro ; Ling, Peter P. ; Monta, Mitsuji. / An illumination system for machine vision inspection of agricultural products. 2006 ASABE Annual International Meeting. 2006.
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