WO2003073379A2 - Verfahren zur signalauswertung eines elektronischen bildsensors und eine anordnung zur auswertung der lage einer körperkante eines prüfkörpers - Google Patents
Verfahren zur signalauswertung eines elektronischen bildsensors und eine anordnung zur auswertung der lage einer körperkante eines prüfkörpers Download PDFInfo
- Publication number
- WO2003073379A2 WO2003073379A2 PCT/DE2003/000568 DE0300568W WO03073379A2 WO 2003073379 A2 WO2003073379 A2 WO 2003073379A2 DE 0300568 W DE0300568 W DE 0300568W WO 03073379 A2 WO03073379 A2 WO 03073379A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- image sensor
- pixel
- body edge
- pixels
- light
- 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.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30108—Industrial image inspection
- G06T2207/30124—Fabrics; Textile; Paper
Definitions
- the invention relates to a method for signal evaluation of an electronic image sensor and an arrangement for evaluating the position of a body edge of a test specimen according to claims 1 or 8.
- a frequently asked task when using electronic image sensors in the pattern recognition of test specimens is to recognize or to assess the position and the course of body edges, in particular straight body edges.
- Image sensors that are designed as line sensors are usually used for such tasks.
- the light-sensitive pixels are arranged side by side in at least one line. Since the edge position of the body edge to be assessed can vary widely in many applications, the absolute number of light-sensitive pixels must be adjusted in accordance with this expected range. The expectation range can be mapped on the line sensor using optics adapted to the corresponding application.
- EP 0 704 821 A2 describes a method for checking objects which are moved past a camera in different positions.
- EP 0 108 470 A1 describes a rotating line sensor, past which objects are transported.
- the invention has for its object to provide a method for signal evaluation of an electronic image sensor and an arrangement for evaluating the position of a body edge of a test specimen.
- the invention is based on the basic idea of replacing the line sensors previously used in evaluating the position of a body edge with surface sensors which have at least two pixel lines and two pixel columns. Because of the widespread use of area sensors, for example in digital cameras, such area sensors are available at low cost.
- the maximum achievable resolution when using such surface sensors is increased in that the body edge to be evaluated is moved past the image sensor in such a way that the body edge does not run parallel to the pixel rows and pixel columns.
- the maximum resolution of the pixels in only one pixel row or only one pixel column is essentially determined by the distance between the light-sensitive areas of the neighboring pixels.
- the body edge to be evaluated is not moved past the image sensor parallel to the pixel rows and pixel columns, it can be achieved that all Areas of the body edge are detected by the pixels arranged one behind the other in the direction of movement. If you look at the image sensor in the direction of movement of the test specimen, the tilting angle between the direction of movement of the test specimen and the edges of the pixel rows or pixel columns shows that the light-sensitive areas of each of the gaps between the light-sensitive areas of the pixels in a pixel row or pixel column Pixels are arranged in the next row of pixels or the column of pixels or pixel column that extends further behind.
- the image sensor Since the image sensor is not arranged in the direction of the direction of movement, there is a certain offset between the light-sensitive areas between the pixels arranged in series in a row or pixel column.
- the light-sensitive area should take up an area proportion of approximately 30% to 45% of the total area of a pixel.
- the body edge of the test body is then recorded at least in two relative positions in succession as it moves past the image sensor and the output signals emitted by the corresponding pixels, which are arranged below the body edge at the respective recording times, are evaluated together in the evaluation unit. If the speed of movement of the test specimen and the time interval between the individual recordings is known, the image data of the recordings taken in succession can be related to one another by appropriate conversion such that the body edge to be evaluated can be assessed in all areas.
- the image sensor is mounted such that it can be adjusted so that the position of the pixel rows or pixel columns can be adjusted relative to the course of the body edge to be evaluated during the conveying movement past the image sensor.
- this makes it possible to change the offset between the light-sensitive areas of the pixels in rows or columns running one behind the other.
- the resolution of the used surface sensor are changed, but it must be taken into account that the effective width of the image sensor decreases in accordance with the tilt angle.
- the only drawing shows the principle of evaluating the position of a body edge of a test specimen with a surface sensor.
- test specimen 01 for example a printed sheet, with body edges 02, 03, 04 and 06 drawn in dashed lines in the drawing is to be by means of a surface sensor 07, which is designed in particular in the manner of a CMOS image sensor and an evaluation electronics connected therein in its position and its cut be checked.
- CMOS sensors have an image structure corresponding to a memory chip, so that individual pixels such as memory cells can be queried. It is therefore only necessary to read out picture elements that are actually to be evaluated.
- the surface sensor 07 has a plurality of pixels 08, in the center of which there is a light-sensitive surface 09. A light signal received at the light-sensitive surfaces 09 is converted into an electrical output signal in the pixel 08, which can be evaluated as image information in the downstream evaluation electronics.
- the pixels 08 form in the area sensor 07 a plurality of pixel rows 11 arranged one behind the other and a plurality of pixel columns 12 arranged side by side.
- the body edge 02 of the test specimen 01 is to be assessed by the surface sensor 07.
- the test specimen 01 is moved past the surface sensor 07 at a specific speed.
- the direction of movement of the test specimen 01 results from the movement arrow 13 in the drawing.
- the surface sensor 07 is rotated counterclockwise by a tilt angle 14.
- the body edge 02 is pulled over the area sensor 07 in such a way that the body edge 02 does not run parallel to the pixel rows 11 and the pixel columns 12.
- the body edge 02 While the test specimen 01 with the body edge 02 is moved past the surface sensor 07, the body edge 02 is recorded several times in succession by the pixels 08 of the surface sensor 07 at equidistant time intervals.
- the position of the body edge 02 during the first four recordings is indicated in dashed lines in the drawing.
- the offset between the light-sensitive surfaces of the pixels 08 in pixel rows 11 arranged one behind the other makes it possible to assess the body edge 02 with very high resolution despite the scanning gaps between the pixels 08 in the individual pixel rows 11.
- the image data recorded in succession in different relative positions between the test specimen 01 and the image sensor 07 by the body edge 02 are offset against one another.
- the speed of movement of the test specimen 01 and the time intervals between the individual images are included in this calculation.
- the dashed lines show possible edge positions and the pixels of the image lines used, on which the edge then comes to rest. This is intended to demonstrate that the pixels of the following lines represent subpixels to the first lines and that different subpixels are “fully modulated” according to the true edge position.
- the pixel grid in the fourth line is exactly the same as that in the first line, that in the second line is the same in the fifth, that in the third is the same in the sixth, etc.
- a measurement deviation which is derived from a paper fiber or the like, can be eliminated by averaging.
- This multiple evaluation refers to an image of the edge position.
- the temporal progression in the edge position can also be recorded using temporally successive image recordings.
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Image Analysis (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2003221587A AU2003221587A1 (en) | 2002-02-26 | 2003-02-22 | Method for evaluating the signals of an electronic image sensor and system for evaluating the position of the edge of a test piece |
| EP03717107A EP1488378A2 (de) | 2002-02-26 | 2003-02-22 | Verfahren zur signalauswertung eines elektronischen bildsensors und eine anordnung zur auswertung der lage einer k rperkante eines pr fk rpers |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2002108287 DE10208287A1 (de) | 2002-02-26 | 2002-02-26 | Verfahren zur Signalauswertung eines elektronischen Bildsensors und eine Anordnung zur Auswertung der Lage einer Körperkante eines Prüfkörpers |
| DE10208287.1 | 2002-02-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2003073379A2 true WO2003073379A2 (de) | 2003-09-04 |
| WO2003073379A3 WO2003073379A3 (de) | 2004-02-12 |
Family
ID=27762462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE2003/000568 Ceased WO2003073379A2 (de) | 2002-02-26 | 2003-02-22 | Verfahren zur signalauswertung eines elektronischen bildsensors und eine anordnung zur auswertung der lage einer körperkante eines prüfkörpers |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1488378A2 (de) |
| AU (1) | AU2003221587A1 (de) |
| DE (1) | DE10208287A1 (de) |
| WO (1) | WO2003073379A2 (de) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2202087A1 (de) * | 1971-02-26 | 1972-09-07 | Polygraph Leipzig | Lichtelektrische Messeinrichtung an bogenbe- und bogenverarbeitenden Maschinen |
| EP0108470A1 (de) * | 1982-08-13 | 1984-05-16 | Bl Technology Limited | Vorrichtung und Verfahren zur Überprüfung eines Teiles |
| JPH0891543A (ja) * | 1994-09-28 | 1996-04-09 | Omron Corp | 画像処理方法およびその装置 |
| US6023535A (en) * | 1995-08-31 | 2000-02-08 | Ricoh Company, Ltd. | Methods and systems for reproducing a high resolution image from sample data |
| US6208765B1 (en) * | 1998-06-19 | 2001-03-27 | Sarnoff Corporation | Method and apparatus for improving image resolution |
| US6804419B1 (en) * | 1998-11-10 | 2004-10-12 | Canon Kabushiki Kaisha | Image processing method and apparatus |
| US6285804B1 (en) * | 1998-12-21 | 2001-09-04 | Sharp Laboratories Of America, Inc. | Resolution improvement from multiple images of a scene containing motion at fractional pixel values |
-
2002
- 2002-02-26 DE DE2002108287 patent/DE10208287A1/de not_active Withdrawn
-
2003
- 2003-02-22 EP EP03717107A patent/EP1488378A2/de not_active Withdrawn
- 2003-02-22 WO PCT/DE2003/000568 patent/WO2003073379A2/de not_active Ceased
- 2003-02-22 AU AU2003221587A patent/AU2003221587A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| AU2003221587A8 (en) | 2003-09-09 |
| WO2003073379A3 (de) | 2004-02-12 |
| DE10208287A1 (de) | 2003-09-18 |
| AU2003221587A1 (en) | 2003-09-09 |
| EP1488378A2 (de) | 2004-12-22 |
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