JPS6474687A - Reading method for crossed square-shaped code - Google Patents
Reading method for crossed square-shaped codeInfo
- Publication number
- JPS6474687A JPS6474687A JP62229867A JP22986787A JPS6474687A JP S6474687 A JPS6474687 A JP S6474687A JP 62229867 A JP62229867 A JP 62229867A JP 22986787 A JP22986787 A JP 22986787A JP S6474687 A JPS6474687 A JP S6474687A
- Authority
- JP
- Japan
- Prior art keywords
- line
- coordinates
- code
- point
- scanning
- 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
Links
Abstract
PURPOSE:To allow scanning in a wide range of angles by setting a reference line of a prescribed size in parallel with a crossed square-shaped code set along a first direction, scanning the reference line within a prescribed angle to decide a scan starting point from the relative angle and based on one of both ends of the reference line, and reading the information on each mesh of the code. CONSTITUTION:A reference line 3 and the scanning direction of a crossed square-shaped code 1 are tilted and the coordinates X00Y00 are defined as the initial value of the line 3 when the number of continuous black picture elements exceeds a fixed value. The scans are successively carried out and a line along which the prescribed number of black picture elements are continuous is obtained. At the left end point, this end point is updated based on X20<X10<X00 together with updating of the X coordinates. No updating is carried out in case of X20<X30<.... At the right end point, the coordinates of this point are updated based on X00<X11<... together with the Y coordinates. While the X coordinates are not updated in case of X81>X91>.... The tilt of the line 3 is obtained from those coordinates and the left point is defined as a standard point. The points separate from the reference point of the line 3 in the (y) direction by 2.5, 7.5 and 9.5mm are decided as the mesh scanning start points of the code 1a for decision of the black or white meshes based on the known positional relation between the code 1 and the line 3. In such constitution, the errors in the (x) and (y) directions and the rotational direction error are allowed for recognition of the code 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62229867A JPS6474687A (en) | 1987-09-16 | 1987-09-16 | Reading method for crossed square-shaped code |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62229867A JPS6474687A (en) | 1987-09-16 | 1987-09-16 | Reading method for crossed square-shaped code |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6474687A true JPS6474687A (en) | 1989-03-20 |
JPH0413752B2 JPH0413752B2 (en) | 1992-03-10 |
Family
ID=16898943
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62229867A Granted JPS6474687A (en) | 1987-09-16 | 1987-09-16 | Reading method for crossed square-shaped code |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6474687A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5446271A (en) * | 1993-08-06 | 1995-08-29 | Spectra-Physics Scanning Systems, Inc. | Omnidirectional scanning method and apparatus |
JPH09171536A (en) * | 1996-11-18 | 1997-06-30 | Teiriyou Sangyo Kk | Two-dimensional data recording reading method of digital data recording paper and device therefor |
US5770847A (en) * | 1994-12-23 | 1998-06-23 | Spectra-Physics Scanning Systems, Inc. | Bar code reader with multi-focus lens |
US5814803A (en) * | 1994-12-23 | 1998-09-29 | Spectra-Physics Scanning Systems, Inc. | Image reader with multi-focus lens |
-
1987
- 1987-09-16 JP JP62229867A patent/JPS6474687A/en active Granted
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5446271A (en) * | 1993-08-06 | 1995-08-29 | Spectra-Physics Scanning Systems, Inc. | Omnidirectional scanning method and apparatus |
US6142376A (en) * | 1993-08-06 | 2000-11-07 | Spectra-Physics Scanning Systems, Inc. | Method and apparatus for reading symbols on items moved by conveyor |
US5770847A (en) * | 1994-12-23 | 1998-06-23 | Spectra-Physics Scanning Systems, Inc. | Bar code reader with multi-focus lens |
US5814803A (en) * | 1994-12-23 | 1998-09-29 | Spectra-Physics Scanning Systems, Inc. | Image reader with multi-focus lens |
US6042012A (en) * | 1994-12-23 | 2000-03-28 | Spectra-Physics Scanning Systems, Inc. | Method and apparatus for reading images without need for self-generated illumination source |
US6073851A (en) * | 1994-12-23 | 2000-06-13 | Spectra-Physics Scanning Systems, Inc. | Multi-focus optical reader with masked or apodized lens |
JPH09171536A (en) * | 1996-11-18 | 1997-06-30 | Teiriyou Sangyo Kk | Two-dimensional data recording reading method of digital data recording paper and device therefor |
Also Published As
Publication number | Publication date |
---|---|
JPH0413752B2 (en) | 1992-03-10 |
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