EP0403497A1 - Vorrichtung und verfahren zum messen eines stapels von baumstämmen - Google Patents

Vorrichtung und verfahren zum messen eines stapels von baumstämmen

Info

Publication number
EP0403497A1
EP0403497A1 EP89902391A EP89902391A EP0403497A1 EP 0403497 A1 EP0403497 A1 EP 0403497A1 EP 89902391 A EP89902391 A EP 89902391A EP 89902391 A EP89902391 A EP 89902391A EP 0403497 A1 EP0403497 A1 EP 0403497A1
Authority
EP
European Patent Office
Prior art keywords
pile
equipment
accordance
logs
carrier
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.)
Withdrawn
Application number
EP89902391A
Other languages
English (en)
French (fr)
Inventor
Jorma Reponen
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.)
VISION-SYSTEMS Oy
Vision Systems Oy
Original Assignee
VISION-SYSTEMS Oy
Vision Systems Oy
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 VISION-SYSTEMS Oy, Vision Systems Oy filed Critical VISION-SYSTEMS Oy
Publication of EP0403497A1 publication Critical patent/EP0403497A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques

Definitions

  • the object of the invention is a method and equipment for measuring a pile of logs, in particular its volume.
  • Finnish patent publications Nos. 51584 and 54971 show a method of measuring the side density of a pile of wood. This takes place optically by measuring the ratio of dark and light areas at the end of the pile.
  • the end of the pile is filmed with a TV camera, on the basis of the video signal of which the ratio referred to is calculated.
  • the length and width of the pile must be measured separately in order to be able to calculate an estimate of the solid cubic measure.
  • the method does not provide an especially precise result, particu ⁇ larly as piles of wood are rarely the same length.
  • the height and length of the pile used in the calculations are average values, which must be estimated. A large possibility of error arises from this. Even the basic method, the measurement of the side density by means of the ratio referred to, has not been satisfactorily implemented in practice.
  • the intention of this invention is to create a new and simple method and equipment for the measurement of a pile of logs as automatically as possible.
  • the principal characteristics of the method in accordance with the invention are presented in the accompanying Patent Claim 1.
  • the basis of the invention is the application of object recognition to recognize the ends of the logs of the pile, by means of which their location can be measured.
  • object recognition in this connection substantially improves the reliability of the measurement compared with known methods. This is based especially on the registration of the form and location of the end of each individual log, on account of which the total magnitudes are not average magnitudes, but the total values of individual recognized objects. Because the logs may cross over inside the pile, it is not necessarily possible to recognize both sides of the ends of the same log.
  • the characteristic features of the equipment in accordance with the invention are presented in Patent Claim 4.
  • the camera can be either a matrix camera or a normal analog video camera, the picture from which is digitalized separately. It is particular ⁇ ly advantageous to use a linear camera, because it can be installed in the same carrier as the distance measurement device.
  • a log pile measurement system equipped with two measurement units.
  • the log pile 1 is placed for measurement in fork 2, which then delimits the measurement area.
  • the fork 2 is connected to an ordinary weighing device, by means of which to weight of the whole pile 1 is obtained.
  • the basic components of the system are the measuring units 3 and 8 on either side of the pile carried by the fork 2, and the calculating equipment 9.
  • Xt consists of an AT-type microcomputer and the data on each pile comes from the printer 7 connected to it.
  • the measuring units 3 and 8 consist of a carrier 4 and its transfer device 5 as well as the IR laser-pulse distance measurement device 10 and CCD linear video camera 6, which are installed on the carrier.
  • the measuring units 3 and 8 are located in relation to the pile fork 2 in such a way that they lie in the same line as the direction of the ends of the pile of logs. Fork 2 delimits the measurement area to about 2.8 m x 2.8 m.
  • the transfer device 5 of the carrier 4 is dimensioned to cover the whole of this area in such a way that both filming and distance measurement take place perpendicularly to the ends of the pile.
  • the measurement is carried out as follows.
  • the pile 1 of logs to be measured is placed in fork 2.
  • the transfer device 5 By means of the transfer device 5 the carrier 4 is moved in steps over the measuring area. After every horizontal pass the horizontal guide rail is lowered by a suitable step.
  • the distance measurements are registered in the calculation equipment 9 as a matrix.
  • the linear camera 6 does not necessarily need to be moved over such a dense field. If the line sensor of camera 6 is vertical, a few passes are sufficient. In practice it is simpler to carry out the filming separately.
  • the filming creates another matrix, in which one nucleus contains the picture nucleus in question as a numerical value of the strength of light from 0...255.
  • the treatment of the picture begins by searching the picture matrix for limit-value points, in which the brightness of the picture changes sharply. After this, an attempt is made to fit curves of various sizes to the limit-value points.
  • Various kinds of criteria can be used to approve the outline of the end of a log. If, for example, the space between two curves that are near to one another strike more limit-value points than are the limit of acceptance, it can be assumed that these points depict the end of a log. The remainder of the limit-value points that form part of the object can be easily found and the missing sections of the curve can be estimated.
  • Data on the outlines of the ends of the logs and their location in an XY direction are obtain as the final result of the treatment of the picture. The distance measurement data obtained from the places of the objects are added to these data.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
EP89902391A 1988-02-17 1989-02-16 Vorrichtung und verfahren zum messen eines stapels von baumstämmen Withdrawn EP0403497A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI880736 1988-02-17
FI880736A FI83910C (fi) 1988-02-17 1988-02-17 Foerfarande och apparatur foer maetning av storheterna hos ett timmerknippe.

Publications (1)

Publication Number Publication Date
EP0403497A1 true EP0403497A1 (de) 1990-12-27

Family

ID=8525932

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89902391A Withdrawn EP0403497A1 (de) 1988-02-17 1989-02-16 Vorrichtung und verfahren zum messen eines stapels von baumstämmen

Country Status (5)

Country Link
EP (1) EP0403497A1 (de)
JP (1) JPH03502835A (de)
AU (1) AU3058189A (de)
FI (1) FI83910C (de)
WO (1) WO1989007749A1 (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI85542C (fi) * 1989-11-27 1992-04-27 Vision Systems Oy Foerfarande och anordning foer maetning av knippen.
DE4303213C2 (de) * 1992-07-08 1995-05-11 Abb Patent Gmbh Verfahren und Anordnung zur Bestimmung des Auftreffgebietes eines Schüttgut-Massenstromes mittels Bildauswertung
SE515950C2 (sv) * 1999-06-23 2001-10-29 Acanova Ab Förfarande och anordning att mäta en timmerstocks vedyteprofil
AU7270200A (en) * 1999-09-14 2001-04-17 Opti-Wood Aps Method for quality determination and handling of elongate wood items
DE102009027449A1 (de) * 2009-07-03 2011-01-05 Hochschule für angewandte Wissenschaft und Kunst Fachhochschule Hildesheim/Holzminden/Göttingen Erfassung von Rundholzpoltern
EP2568252A1 (de) 2011-09-06 2013-03-13 HM Puidukaubandus OÜ Verfahren und Vorrichtung zur akkuraten Messung der Holzmenge
EA038155B1 (ru) * 2018-09-17 2021-07-15 Дейталог, Ллк Система обмеривания бревен и связанные способы
FI20195628A1 (fi) * 2019-07-11 2021-01-12 Teknosavo Oy Menetelmä kuitupuu- tai tukkinipun tilavuuden määrittämiseksi
JP7113533B2 (ja) * 2020-03-12 2022-08-05 株式会社オートインスペクト 管材自動検査装置
CN115839660B (zh) * 2022-11-02 2025-12-12 佛山市德维讯智能科技有限公司 一种圆形木材体积自动估算装置以及方法
FI131433B1 (fi) * 2023-10-20 2025-04-22 Teknosavo Oy Menetelmä kuitupuu- tai tukkinipun kiintotilavuuden määrittämiseksi

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI51534C (fi) * 1972-03-27 1977-01-10 Kajaani Oy Menetelmä ja laite puupinon kylkitiheyden mittaamiseksi.
US3852579A (en) * 1973-03-23 1974-12-03 Sun Studs Method and apparatus for determining the surface configuration of elongate objects, particularly logs
FI54971C (fi) * 1974-02-07 1979-04-10 Kajaani Oy Foerfarande foer maetning av flanktaetheten av en vedtrave

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8907749A1 *

Also Published As

Publication number Publication date
FI880736A0 (fi) 1988-02-17
JPH03502835A (ja) 1991-06-27
FI880736L (fi) 1989-08-18
AU3058189A (en) 1989-09-06
WO1989007749A1 (en) 1989-08-24
FI83910B (fi) 1991-05-31
FI83910C (fi) 1991-09-10

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