WO1986003867A1 - Image analysis apparatus - Google Patents
Image analysis apparatus Download PDFInfo
- Publication number
- WO1986003867A1 WO1986003867A1 PCT/GB1985/000587 GB8500587W WO8603867A1 WO 1986003867 A1 WO1986003867 A1 WO 1986003867A1 GB 8500587 W GB8500587 W GB 8500587W WO 8603867 A1 WO8603867 A1 WO 8603867A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chart
- carrier
- analysing
- illuminating
- imaging
- Prior art date
Links
- 238000010191 image analysis Methods 0.000 title description 2
- 238000003384 imaging method Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 abstract description 10
- 238000005286 illumination Methods 0.000 abstract description 3
- 230000007246 mechanism Effects 0.000 description 3
- 241001553014 Myrsine salicina Species 0.000 description 1
- 229920005439 Perspex® Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000002547 anomalous effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/002—Specific input/output arrangements not covered by G06F3/01 - G06F3/16
- G06F3/005—Input arrangements through a video camera
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/002—Analysing tachograph charts
Definitions
- This invention relates to apparatus for analysing graph cal in ormation on a planar carrier.
- the inven- tion is particularly, but not exclusively, applicable to the analysis of graphical data such as the traces on a tachograph chart-
- tachographs are now compulsory on certain classes of vehicle. These devices have various benefits in improving road safety and regulating transport operations.
- analysis of tachograph charts has hitherto been carried out in practice by eye, which is time consuming and inaccurate.
- An ob ect of the present invention is to provide an apparatus for the automatic analysis of tachograph charts, or similar data, which will enhance the practical useful- ness of such charts.
- the invention provides apparatus for analysing graphical informartion on a planar carrier, compri s ng: means for illuminating said carrier; imaging means operable to provide an accurate representation of the graphical information by means of a digitised video signal or a numerical array; and means defining a datum point within the area viewed by the imaging means.
- the invention provides a method of analysing a tachograph or like chart, including illu ⁇ minating the chart from behind, and imaging the front of the chart to provide a digitized video signal or numerical array.
- Fig. 1 is a block diagram of an apparatus embodying the invention
- Fig. 2 is a schematic cross-sectional view of a chart platen and associated parts used in the apparatus of Fig. 1;
- Fig. 3 is a plan view of a lens member ⁇ f Fig. 2;
- Fig. 4 is a cross-sectional side view of a boss used in Fig. 2.
- tachograph charts are loaded into a hopper 100 from which they are removed one at a time by a pick/feed mechanism 102 and loaded by a loader mechanism 104 onto a chart platen assembly 106 for analysis. After analysis, the charts are discharged to an analysed chart hopper 108. Suitable mechanisms for handling the charts will be apparent to those skilled in the art, and thus the parts 100, 102, 104, 108 are not described in detail herein. Alternat vely, charts could be loaded in and removed from the platen assembly 106 by hand.
- the analysis of the chart is performed by imaging the chart by a video camera 110 to provide an analog video signal which is converted to digital format in A/D converter 112 and suppl ed to a microcomputer 114.
- the microcomputer 114 is programmed to extract the desired information from the video signal and to provide a desired analysis on a printer 116. Data can also be transferred to a mainframe computer or other data handling devices.
- the apparatus also includes a video monitor 118 driven by the microcomputer 114 via a D/A converter 120.
- the video image can also be displayed on the monitor 118 via the D/A converter 120, and can be multiplexed with text resulting from the analysis. This allows areas of the chart image which are unusual or anomalous to be drawn to the operator's attention on a real-time basi s .
- the whole chart area is imaged by video camera 110, and the record traces are identified and quantized by examination of the digitized video signal.
- a datum point is established, e.g. by a fixed central l- ' ght spot as in Fig. 4 below, or by means of a special marking on the chart .
- the chart could be rotated past a camera or an array of light sensitive elements to provide a video signal or a numerical array.
- Figs. 2 to 4 illustrate a preferred form of the platen assembly 106.
- the preferred embodiment to be described has two features which over ⁇ come or itigate these problems, namely (1) illu ination of the chart from the rear, and (2) the use of a special lens men.ber .
- a tachograph chart 10 is mounted on a transparent holder 12, which may suitably be in the form of a slide or drawer.
- the central aper ⁇ ture of the chart 10 is engaged by a boss 40.
- a lens 16 images the chart 10 in the video camera.
- the chart 10 is illuminated from below by a toro dal lamp 18, which is provided with a toroidal reflector 20 and a plane circular reflector 22.
- the geometrical relationship of the lens 16, lamps 18, and plane reflec- tor 22 is such that the i age in the latter of the lamp 18 ( as indicated at 18') fills the field of view of the lens 16, indicated at 24.
- maximum utilisation of the available light is achieyed.
- Tachograph charts, and certain other charts, are recorded by means of styli which form substantially V-shaped grooves in a coating.
- rear illumination gives a sharper and hence more accurate image; it causes the grooves to be illuminated in a distinct manner which can be readily imaged regardless of the body colour of the chart, whilst surface marks such as finger marks are not illuminated and thus do not give rise to spurious images.
- a colour filter between the chart 10 and the lamp 18. This may be used to remove from view printed matter on the underside of the chart.
- the imaging is further improved by the lens member 26.
- the member 26 comprises a plane base 28 from which project two toroidal segments 30,32 of semi-circular cross-section. In use, the segments 30, 32 overlie inner and outer tracks of a conventional tachograph chart 10 and enhance their i aging by providing both magnification (approx mately x 3) and a condenser lens effect.
- the lens member 26 as shown has a segmental opening 36 to allow the chart 10 and means carrying it, such as boss 40, to be sl d into place.
- the lens member 26 could be vertically displaceable in which case the parts 30,32 could extend through 360°C.
- the boss 40 is provided (Fig. 4) with a central aperture 38 which passes illumination from the lamp 18 to produce a bright light spot in the centre of the field of view of the lens 16, the remainder of the central area being dark because of, the member 42.
- This light spot is imaged by the video camera to provide a datum for establishing coordinates of the chart indicia, thus reducing the mechanical accuracy required in positioning the chart .
- Tachograoh charts in current use may have either of two forms of central aperture, one relatively small and circular, the other larger and elongate or pear- shaped.
- the boss 40 is adapted for the first type of chart and a cap 44 may be press-fitted thereon to receive the second type.
- the cap 44 is provided with an aperture 46 to reveal the aperture 38.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Multimedia (AREA)
- Human Computer Interaction (AREA)
- General Engineering & Computer Science (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Apparatus for analysing graphical data on a planar carrier, e.g. a tachograph chart, uses a video camera (110) and A/D converter (112) or equivalent devices to provide a digitised video signal for analysis by a microcomputer (118) via a D/A converter (120), and can be multiplexed with text resulting from the analysis. In a preferred form (Fig. 2) the chart is illuminated from the rear and this illumination in conjunction with an aperture provides a datum.
Description
IMAGE ANALYSIS APPARATUS
This invention relates to apparatus for analysing graph cal in ormation on a planar carrier. The inven- tion is particularly, but not exclusively, applicable to the analysis of graphical data such as the traces on a tachograph chart- In many countries tachographs are now compulsory on certain classes of vehicle. These devices have various benefits in improving road safety and regulating transport operations. However, analysis of tachograph charts has hitherto been carried out in practice by eye, which is time consuming and inaccurate.
An ob ect of the present invention is to provide an apparatus for the automatic analysis of tachograph charts, or similar data, which will enhance the practical useful- ness of such charts.
Accordingly, the invention. provides apparatus for analysing graphical informartion on a planar carrier, compri s ng: means for illuminating said carrier; imaging means operable to provide an accurate representation of the graphical information by means of a digitised video signal or a numerical array; and means defining a datum point within the area viewed by the imaging means. From another aspect, the invention provides a method of analysing a tachograph or like chart, including illu¬ minating the chart from behind, and imaging the front of the chart to provide a digitized video signal or numerical array. An embodiment of the invention will now be des¬ cribed, by way of example, with reference to the drawings, in which:-
Fig. 1 is a block diagram of an apparatus embodying the invention; Fig. 2 is a schematic cross-sectional view of a chart
platen and associated parts used in the apparatus of Fig. 1;
Fig. 3 is a plan view of a lens member σf Fig. 2; and
Fig. 4 is a cross-sectional side view of a boss used in Fig. 2.
Referring to Fig. 1, tachograph charts are loaded into a hopper 100 from which they are removed one at a time by a pick/feed mechanism 102 and loaded by a loader mechanism 104 onto a chart platen assembly 106 for analysis. After analysis, the charts are discharged to an analysed chart hopper 108. Suitable mechanisms for handling the charts will be apparent to those skilled in the art, and thus the parts 100, 102, 104, 108 are not described in detail herein. Alternat vely, charts could be loaded in and removed from the platen assembly 106 by hand.
The analysis of the chart is performed by imaging the chart by a video camera 110 to provide an analog video signal which is converted to digital format in A/D converter 112 and suppl ed to a microcomputer 114. The microcomputer 114 is programmed to extract the desired information from the video signal and to provide a desired analysis on a printer 116. Data can also be transferred to a mainframe computer or other data handling devices.
The apparatus also includes a video monitor 118 driven by the microcomputer 114 via a D/A converter 120. Preferably, the video image can also be displayed on the monitor 118 via the D/A converter 120, and can be multiplexed with text resulting from the analysis. This allows areas of the chart image which are unusual or anomalous to be drawn to the operator's attention on a real-time basi s .
In the preferred embodiment shown, the whole chart
area is imaged by video camera 110, and the record traces are identified and quantized by examination of the digitized video signal. Suitably, a datum point is established, e.g. by a fixed central l-'ght spot as in Fig. 4 below, or by means of a special marking on the chart .
Alternative imaging methods are possible; for example, the chart could be rotated past a camera or an array of light sensitive elements to provide a video signal or a numerical array.
Figs. 2 to 4 illustrate a preferred form of the platen assembly 106. We have found that there can be difficulties in obtaining a good video signal arising from (a) the fact that charts in common use are of a variety of colours and (b) the presence of smudges or fingermarks on the surface of the chart. The preferred embodiment to be described has two features which over¬ come or itigate these problems, namely (1) illu ination of the chart from the rear, and (2) the use of a special lens men.ber .
Referring to Fig. 2, a tachograph chart 10 is mounted on a transparent holder 12, which may suitably be in the form of a slide or drawer. The central aper¬ ture of the chart 10 is engaged by a boss 40. A lens 16 images the chart 10 in the video camera.
The chart 10 is illuminated from below by a toro dal lamp 18, which is provided with a toroidal reflector 20 and a plane circular reflector 22. The geometrical relationship of the lens 16, lamps 18, and plane reflec- tor 22 is such that the i age in the latter of the lamp 18 (as indicated at 18') fills the field of view of the lens 16, indicated at 24. Thus maximum utilisation of the available light is achieyed.
Tachograph charts, and certain other charts, are recorded by means of styli which form substantially
V-shaped grooves in a coating. We have found that rear illumination gives a sharper and hence more accurate image; it causes the grooves to be illuminated in a distinct manner which can be readily imaged regardless of the body colour of the chart, whilst surface marks such as finger marks are not illuminated and thus do not give rise to spurious images. It is useful in certain cases to interpose a colour filter between the chart 10 and the lamp 18. This may be used to remove from view printed matter on the underside of the chart. The imaging is further improved by the lens member 26.
This may conveniently be formed from 'Perspex' or other transparent plastics material by machining or moulding. The member 26 comprises a plane base 28 from which project two toroidal segments 30,32 of semi-circular cross-section. In use, the segments 30, 32 overlie inner and outer tracks of a conventional tachograph chart 10 and enhance their i aging by providing both magnification (approx mately x 3) and a condenser lens effect.
The circular area 34 between the segments 30,32 s plane. This area 34 registers with a bar-type trace found on certain forms of tachograph chart which can be easily read without magnification.
The lens member 26 as shown has a segmental opening 36 to allow the chart 10 and means carrying it, such as boss 40, to be sl d into place. Alternatively, the lens member 26 could be vertically displaceable in which case the parts 30,32 could extend through 360°C.
The boss 40 is provided (Fig. 4) with a central aperture 38 which passes illumination from the lamp 18 to produce a bright light spot in the centre of the field of view of the lens 16, the remainder of the central area being dark because of, the member 42. This light
spot is imaged by the video camera to provide a datum for establishing coordinates of the chart indicia, thus reducing the mechanical accuracy required in positioning the chart . '
Tachograoh charts in current use may have either of two forms of central aperture, one relatively small and circular, the other larger and elongate or pear- shaped. As shown in Fig. 3, in a further modification the boss 40 is adapted for the first type of chart and a cap 44 may be press-fitted thereon to receive the second type. The cap 44 is provided with an aperture 46 to reveal the aperture 38.
Claims
1. Apparatus for analysing graphical information on a planar carrier, comprising: means for holding said carrier at a predetermined location; means for illuminating said carrier; imaging means operable to provide an accurate representation of the graphical information by means of a digitised video signal or a numerical array; and means defining a datum point within the area viewed by the imaging means.
2. The apparatus of clai 1 , in which the holding means is at least partially transparent, the illuminating means is disposed on one side of said carrier, and the imaging means is disposed at the opposite side of said carrier.
3. The apparatus of claim 2, in which the illuminating means is a toroidal tubular lamp positioned on a planar reflecting surface parallel to the carrier, and the image of the lamp in said surface is located to fill the field of view of the imaging means.
4. The apparatus of any preceding claim, for use in analysing a chart bear ng one or more generally circular traces, including a lens member overlying the chart position, the lens member comprising a planar base portion and one or more toroidal segments of part- circular cross section positioned to overlie, in. use, said t race (s ) .
5. The apparatus of clai 2, in which said datum means comprises an apertured member in said holding means, the aperture cooperating with the illuminating means to provide a fixed light spot.
6. The apparatus of any of claims 1 to 4, in which said datum means comprises an indicium printed on said carrier.
7. The apparatus of any preceding claim, for use in analysing generally circular charts having central apertures, in which said holding means includes a central boss dimensioned to receive one standard aperture, and there is provided a cap removably engageable over the boss and dimensioned to receive another standard aperture.
8. A method of analysing a tachograph or like chart, including illuminating the chart from behind, and imaging the front of the chart to provide a digitized video signal or numerical array.
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8431982 | 1984-12-19 | ||
GB848431982A GB8431982D0 (en) | 1984-12-19 | 1984-12-19 | Automatic chart analyser |
GB8503588 | 1985-02-12 | ||
GB858503588A GB8503588D0 (en) | 1984-12-19 | 1985-02-12 | Image analysis apparatus |
GB858518810A GB8518810D0 (en) | 1984-12-19 | 1985-07-25 | Image analysis |
GB8518810 | 1985-07-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1986003867A1 true WO1986003867A1 (en) | 1986-07-03 |
Family
ID=27262543
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1985/000587 WO1986003867A1 (en) | 1984-12-19 | 1985-12-16 | Image analysis apparatus |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0205529A1 (en) |
WO (1) | WO1986003867A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993008543A1 (en) * | 1991-10-16 | 1993-04-29 | Trutac Limited | Method and apparatus for reading tachograph charts |
EP0550080A1 (en) * | 1991-10-18 | 1993-07-07 | Wouterus Hendrikus Maria Dekkers | Method and device for the automatic processing of data recorded on a tachograph chart |
FR2700868A1 (en) * | 1993-01-22 | 1994-07-29 | Atcom Sarl | Process and device for reading and processing information from a chronotachograph disk |
EP0854450A2 (en) * | 1997-01-17 | 1998-07-22 | Mauro Balestra | Method for microscopical evaluation of the tachograph discs |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3003066A (en) * | 1959-02-25 | 1961-10-03 | Benjamin L Snavely | Gating circuit for scanning trace converter |
US3639767A (en) * | 1969-09-16 | 1972-02-01 | Valentin Mikhailovich Sitniche | Photoelectric tracer comprising two lenses or apertures located along a common radius from an axis of rotation |
US3655948A (en) * | 1969-04-26 | 1972-04-11 | Kienzle Apparate Gmbh | Apparatus for automatically evaluating recordings on a record carrier |
FR2107647A5 (en) * | 1970-09-14 | 1972-05-05 | Itek Corp | |
GB1354335A (en) * | 1971-12-15 | 1974-06-05 | Atomic Energy Authority Uk | Apparatus for causing relative movement of a point along a trace |
US3829660A (en) * | 1971-11-19 | 1974-08-13 | H Ruhl | Pen chart analyser |
US3908081A (en) * | 1972-02-03 | 1975-09-23 | Efficient Instr Corp | Apparatus for converting graph data into a form suitable for computer processing |
US3982105A (en) * | 1973-11-16 | 1976-09-21 | Tvi-Television Industrielle S.A. | Device for the automatic reading and evaluation of recorded curves |
FR2305799A1 (en) * | 1975-03-24 | 1976-10-22 | Smiths Industries Ltd | PROCEDURE FOR READING TACHOGRAPHIC RECORDINGS |
FR2344076A1 (en) * | 1976-03-09 | 1977-10-07 | Messerschmitt Boelkow Blohm | INSTALLATION OF ANALYSIS OF INFORMATION CONTAINED IN PLANNED DOCUMENTS |
DE3221823A1 (en) * | 1982-06-09 | 1983-12-15 | Ainedter Beteiligungs- und Entwicklungsgesellschaft mbH, 5020 Salzburg | Semiautomatic digitising method |
-
1985
- 1985-12-16 EP EP19860900209 patent/EP0205529A1/en not_active Withdrawn
- 1985-12-16 WO PCT/GB1985/000587 patent/WO1986003867A1/en not_active Application Discontinuation
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3003066A (en) * | 1959-02-25 | 1961-10-03 | Benjamin L Snavely | Gating circuit for scanning trace converter |
US3655948A (en) * | 1969-04-26 | 1972-04-11 | Kienzle Apparate Gmbh | Apparatus for automatically evaluating recordings on a record carrier |
US3639767A (en) * | 1969-09-16 | 1972-02-01 | Valentin Mikhailovich Sitniche | Photoelectric tracer comprising two lenses or apertures located along a common radius from an axis of rotation |
FR2107647A5 (en) * | 1970-09-14 | 1972-05-05 | Itek Corp | |
US3829660A (en) * | 1971-11-19 | 1974-08-13 | H Ruhl | Pen chart analyser |
GB1354335A (en) * | 1971-12-15 | 1974-06-05 | Atomic Energy Authority Uk | Apparatus for causing relative movement of a point along a trace |
US3908081A (en) * | 1972-02-03 | 1975-09-23 | Efficient Instr Corp | Apparatus for converting graph data into a form suitable for computer processing |
US3982105A (en) * | 1973-11-16 | 1976-09-21 | Tvi-Television Industrielle S.A. | Device for the automatic reading and evaluation of recorded curves |
FR2305799A1 (en) * | 1975-03-24 | 1976-10-22 | Smiths Industries Ltd | PROCEDURE FOR READING TACHOGRAPHIC RECORDINGS |
FR2344076A1 (en) * | 1976-03-09 | 1977-10-07 | Messerschmitt Boelkow Blohm | INSTALLATION OF ANALYSIS OF INFORMATION CONTAINED IN PLANNED DOCUMENTS |
DE3221823A1 (en) * | 1982-06-09 | 1983-12-15 | Ainedter Beteiligungs- und Entwicklungsgesellschaft mbH, 5020 Salzburg | Semiautomatic digitising method |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993008543A1 (en) * | 1991-10-16 | 1993-04-29 | Trutac Limited | Method and apparatus for reading tachograph charts |
GB2275336A (en) * | 1991-10-16 | 1994-08-24 | Philip Cyril West | Method and apparatus for reading tachograph charts |
GB2275336B (en) * | 1991-10-16 | 1995-08-23 | Philip Cyril West | Method and apparatus for reading tachograph charts |
EP0550080A1 (en) * | 1991-10-18 | 1993-07-07 | Wouterus Hendrikus Maria Dekkers | Method and device for the automatic processing of data recorded on a tachograph chart |
FR2700868A1 (en) * | 1993-01-22 | 1994-07-29 | Atcom Sarl | Process and device for reading and processing information from a chronotachograph disk |
EP0854450A2 (en) * | 1997-01-17 | 1998-07-22 | Mauro Balestra | Method for microscopical evaluation of the tachograph discs |
EP0854450A3 (en) * | 1997-01-17 | 2001-05-02 | Mauro Balestra | Method for microscopical evaluation of the tachograph discs |
Also Published As
Publication number | Publication date |
---|---|
EP0205529A1 (en) | 1986-12-30 |
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