EP1022066A1 - Tri optique d'asperges - Google Patents

Tri optique d'asperges Download PDF

Info

Publication number
EP1022066A1
EP1022066A1 EP00200188A EP00200188A EP1022066A1 EP 1022066 A1 EP1022066 A1 EP 1022066A1 EP 00200188 A EP00200188 A EP 00200188A EP 00200188 A EP00200188 A EP 00200188A EP 1022066 A1 EP1022066 A1 EP 1022066A1
Authority
EP
European Patent Office
Prior art keywords
asparagus
angle
picture
camera
tip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00200188A
Other languages
German (de)
English (en)
Other versions
EP1022066B1 (fr
Inventor
Jean Paul Charles Francois Hubert Smeets
Erik Matthijs Walstra
Erwin Paul Maria Bakker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kwestar BV
Original Assignee
Kwestar BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kwestar BV filed Critical Kwestar BV
Publication of EP1022066A1 publication Critical patent/EP1022066A1/fr
Application granted granted Critical
Publication of EP1022066B1 publication Critical patent/EP1022066B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C2501/00—Sorting according to a characteristic or feature of the articles or material to be sorted
    • B07C2501/009—Sorting of fruit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/04—Sorting according to size

Definitions

  • the invention relates to a device for sorting asparagus comprising transport facilities for the feeding of asparagus, a camera for taking a picture of an asparagus, electronic processing facilities in order to assign a qualification to the picture taken by the camera, and sorting facilities for sorting the asparagus according to the qualification.
  • Such a device is known from the American patent US 4.271.967.
  • the picture information is used to determine the diameter and length of the asparagus and then the asparagus is sorted according to diameter and length.
  • the picture information is used to determine the diameter and length of the asparagus and then the asparagus is sorted according to diameter and length.
  • An objective of the invention is to provide a device of the type described above in which asparagus can be sorted according to whether they are blooming or not.
  • the device according to the invention is characterized in that it comprises a light source for illuminating an asparagus, which light source emanates light in a structured manner, and the electronic processing facilities are such that they analyze the image of the light projected on an asparagus in order to establish a qualification for blooming of the tip of the asparagus. If structured light is projected on a smooth surface the image of the projection will be smooth and regular. On projection on an uneven surface such as the open tip of a blooming asparagus the image will be uneven and irregular. The degree of irregularity forms the qualification for the extent of blooming of the tip of an asparagus.
  • structured light should be understood to mean light that has a defined form and/or demonstrates a defined pattern, for example a straight line or a meshwork of straight lines.
  • the degree of blooming can be derived from the shape of the image of the light projected on the asparagus.
  • an embodiment of the device according to the invention is characterized in that the light source illuminates the asparagus at an angle that differs from the angle at which the camera takes a picture of the asparagus. This shows irregularities of the asparagus more clearly.
  • the light source illuminates the asparagus at an angle that is almost a right angle to the longitudinal direction of the asparagus and the camera takes a picture of the asparagus at an angle with regard to the longitudinal direction of the asparagus.
  • Another embodiment of the device is characterized in that, because the light source projects structured light on the tip of the asparagus and the electronic processing equipment only analyzes the image of the light projected on the tip of an asparagus.
  • An asparagus only blooms on its tip. By only analyzing the image of the portion of the asparagus where blooming occurs, the sorting can be done more quickly than by analysis of an image over a larger portion of the asparagus.
  • the device comprises holders for the asparagus in which all the asparagus are oriented in the same direction. This makes it unnecessary to first determine the tip of the asparagus in order to be able to ascertain whether it is blooming or not.
  • the invention also relates to a working method for sorting asparagus in which asparagus are transported to a camera, after which a picture of an asparagus is taken by the camera and using electronic processing equipment a qualification is established from the picture of the asparagus which is then sorted depending on the qualification of the asparagus.
  • the invention is characterized in that the structured light is projected on the asparagus to be sorted and the qualification is made on the basis of the image of the light projected on the asparagus, in which the degree of blooming of the tip of the asparagus is ascertained.
  • an embodiment of the working method according to the invention is characterized in that the asparagus is illuminated at an angle that differs from the angle at which the camera takes a picture of the asparagus.
  • the asparagus is illuminated at an angle that is almost a right angle in terms of the longitudinal direction of the asparagus and the camera takes a picture of the asparagus at an angle with regard to the longitudinal direction of the asparagus.
  • a further embodiment of the working method according to the invention is characterized in that structured light is projected on the tip of the asparagus and only the image of the light projected on the tip of an asparagus is analyzed.
  • FIG. 1 shows a schematic image of an embodiment of the device for sorting asparagus according to the invention.
  • the device 1 comprises transport facilities for the feeding of asparagus 3.
  • the transport facilities comprise a belt 5, schematically illustrated by broken lines, on which holders 7 for asparagus can be seen.
  • the asparagus 3 are oriented lengthwise with the tip 9 extending on one side.
  • the holders 7 can rotate around an axis 11.
  • the rotation is driven by sorting facilities 13 that can activate movable arms 15 that are located across from receptacles 17.
  • the sorting facilities 13 will tilt the asparagus into the receptacle 17 belonging to the qualification.
  • the qualification originates in electronic processing facilities 19 that use the picture taken by a camera 21 to establish a qualification of the asparagus with regard to the blooming of the tip of the asparagus.
  • This camera 21 is at an angle with regard to the longitudinal direction 23 of the asparagus 3 and takes a picture of the light that is projected by a light source 25 on the tip 9 of the asparagus.
  • This light source 25 is at a right angle to the longitudinal direction 23 of the asparagus 3 and projects structured light in the form of a straight line diagonal to the asparagus, which is shown in more detail in the following figures.
  • Figure 2 shows a portion of an asparagus 27 with a closed tip (this is an asparagus that is not blooming) with the image 29 of a projected line on it in a view at an angle to the longitudinal direction of the asparagus.
  • the projected straight line is perceived as a curved line, such that the shape of the asparagus is better visualized.
  • an asparagus 31 with an open tip (this is a blooming asparagus) is shown at the same angle.
  • This asparagus 31 demonstrates blooming 33 on the tip such that the image 35 of the light is irregular, which represents a degree of blooming.

Landscapes

  • Sorting Of Articles (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Preparation Of Fruits And Vegetables (AREA)
  • Medicines Containing Plant Substances (AREA)
EP00200188A 1999-01-20 2000-01-19 Tri optique d'asperges Expired - Lifetime EP1022066B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1011080 1999-01-20
NL1011080A NL1011080C2 (nl) 1999-01-20 1999-01-20 Inrichting en werkwijze voor het sorteren van asperges.

Publications (2)

Publication Number Publication Date
EP1022066A1 true EP1022066A1 (fr) 2000-07-26
EP1022066B1 EP1022066B1 (fr) 2006-07-12

Family

ID=19768509

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00200188A Expired - Lifetime EP1022066B1 (fr) 1999-01-20 2000-01-19 Tri optique d'asperges

Country Status (4)

Country Link
EP (1) EP1022066B1 (fr)
AT (1) ATE332766T1 (fr)
DE (1) DE60029265T2 (fr)
NL (1) NL1011080C2 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6378013A (ja) * 1986-09-19 1988-04-08 Iseki & Co Ltd 農産物等の形状識別装置
US4875777A (en) * 1987-09-30 1989-10-24 Industrial Technology Institute Off-axis high accuracy structured light profiler
JPH03278870A (ja) * 1990-03-27 1991-12-10 Toshiba Eng Co Ltd グリーンアスパラガスの選別方法
US5381236A (en) * 1991-02-12 1995-01-10 Oxford Sensor Technology Limited Optical sensor for imaging an object
EP0881002A1 (fr) * 1997-05-30 1998-12-02 Besnard Père et Fils (Sarl) Système pour le calibrage automatique des asperges incluant un dispositif de reconnaissance optique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6378013A (ja) * 1986-09-19 1988-04-08 Iseki & Co Ltd 農産物等の形状識別装置
US4875777A (en) * 1987-09-30 1989-10-24 Industrial Technology Institute Off-axis high accuracy structured light profiler
JPH03278870A (ja) * 1990-03-27 1991-12-10 Toshiba Eng Co Ltd グリーンアスパラガスの選別方法
US5381236A (en) * 1991-02-12 1995-01-10 Oxford Sensor Technology Limited Optical sensor for imaging an object
EP0881002A1 (fr) * 1997-05-30 1998-12-02 Besnard Père et Fils (Sarl) Système pour le calibrage automatique des asperges incluant un dispositif de reconnaissance optique

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 307 (P - 747) 22 August 1988 (1988-08-22) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 098 (C - 0918) 11 March 1992 (1992-03-11) *

Also Published As

Publication number Publication date
EP1022066B1 (fr) 2006-07-12
DE60029265T2 (de) 2007-08-30
DE60029265D1 (de) 2006-08-24
ATE332766T1 (de) 2006-08-15
NL1011080C2 (nl) 2000-07-21

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