EP0403497A1 - A method and equipment for measuring a pile of logs - Google Patents
A method and equipment for measuring a pile of logsInfo
- Publication number
- EP0403497A1 EP0403497A1 EP19890902391 EP89902391A EP0403497A1 EP 0403497 A1 EP0403497 A1 EP 0403497A1 EP 19890902391 EP19890902391 EP 19890902391 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- Withdrawn
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.
Abstract
La présente invention se rapporte à un procédé et à un équipement servant à mesurer les grandeurs d'une pile (1) de troncs d'arbres, tel notamment le volume de bois. Le but de la présente invention est de créer un procédé nouveau et simple pour mesurer les grandeurs d'une pile de troncs. Selon la présente invention, les contours des extrémités des troncs sont reconnus depuis les deux extrémités de la pile et l'emplacement des contours reconnus est mesuré et, si nécessaire, la totalité du poids de la pile est mesurée, et c'est sur la base de cette mesure que les grandeurs désirées sont calculées au moyen d'un modèle théorique.The present invention relates to a method and equipment used to measure the sizes of a stack (1) of tree trunks, such as the volume of wood. The object of the present invention is to create a new and simple method for measuring the sizes of a stack of trunks. According to the present invention, the contours of the ends of the trunks are recognized from the two ends of the stack and the location of the recognized contours is measured and, if necessary, the entire weight of the stack is measured, and this is on the based on this measurement that the desired quantities are calculated using a theoretical model.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI880736 | 1988-02-17 | ||
FI880736A FI83910C (en) | 1988-02-17 | 1988-02-17 | Method and apparatus for measuring the quantities of a timber knife |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0403497A1 true EP0403497A1 (en) | 1990-12-27 |
Family
ID=8525932
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890902391 Withdrawn EP0403497A1 (en) | 1988-02-17 | 1989-02-16 | A method and equipment for measuring a pile of logs |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0403497A1 (en) |
JP (1) | JPH03502835A (en) |
AU (1) | AU3058189A (en) |
FI (1) | FI83910C (en) |
WO (1) | WO1989007749A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI85542C (en) * | 1989-11-27 | 1992-04-27 | Vision Systems Oy | FOERFARANDE OCH ANORDNING FOER MAETNING AV KNIPPEN. |
DE4303213C2 (en) * | 1992-07-08 | 1995-05-11 | Abb Patent Gmbh | Method and arrangement for determining the impact area of a bulk material mass flow by means of image evaluation |
SE515950C2 (en) * | 1999-06-23 | 2001-10-29 | Acanova Ab | Method and apparatus for measuring the log surface profile of a log |
AU7270200A (en) * | 1999-09-14 | 2001-04-17 | Opti-Wood Aps | Method for quality determination and handling of elongate wood items |
DE102009027449A1 (en) * | 2009-07-03 | 2011-01-05 | Hochschule für angewandte Wissenschaft und Kunst Fachhochschule Hildesheim/Holzminden/Göttingen | Registration of round logs |
EP2568252A1 (en) | 2011-09-06 | 2013-03-13 | HM Puidukaubandus OÜ | Method and a device for accurate measuring of volume of timber |
CN114413761A (en) * | 2018-09-17 | 2022-04-29 | 数据储存有限责任公司 | Log sizing system and related method |
FI20195628A1 (en) * | 2019-07-11 | 2021-01-12 | Teknosavo Oy | Method for determination of volume of pulp wood or timber stack |
JP7113533B2 (en) * | 2020-03-12 | 2022-08-05 | 株式会社オートインスペクト | Automatic pipe inspection device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI51534C (en) * | 1972-03-27 | 1977-01-10 | Kajaani Oy | Method and device for measuring the flank density of a wood pile. |
US3852579A (en) * | 1973-03-23 | 1974-12-03 | Sun Studs | Method and apparatus for determining the surface configuration of elongate objects, particularly logs |
FI54971C (en) * | 1974-02-07 | 1979-04-10 | Kajaani Oy | FOERFARANDE FOER MAETNING AV FLANKTAETHETEN AV EN VEDTRAVE |
-
1988
- 1988-02-17 FI FI880736A patent/FI83910C/en not_active IP Right Cessation
-
1989
- 1989-02-16 AU AU30581/89A patent/AU3058189A/en not_active Abandoned
- 1989-02-16 JP JP50219489A patent/JPH03502835A/en active Pending
- 1989-02-16 EP EP19890902391 patent/EP0403497A1/en not_active Withdrawn
- 1989-02-16 WO PCT/FI1989/000028 patent/WO1989007749A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO8907749A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH03502835A (en) | 1991-06-27 |
FI83910B (en) | 1991-05-31 |
FI880736A0 (en) | 1988-02-17 |
AU3058189A (en) | 1989-09-06 |
WO1989007749A1 (en) | 1989-08-24 |
FI83910C (en) | 1991-09-10 |
FI880736A (en) | 1989-08-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19900704 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
17Q | First examination report despatched |
Effective date: 19910726 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19930730 |