Dynamically variable machine readable binary code and method for reading and producing thereof

• US 5,464,974 A
• Filed: 06/23/1994
• Issued: 11/07/1995
• Est. Priority Date: 05/05/1988
• Status: Expired due to Term

• Current Assignee: Microscan Systems Inc (Omron Corporation)
• Original Assignee: International Data Matrix Incorporated
• Inventors: Priddy, Dennis G., Cymbalski, Robert S.
• Primary Examiner(s): Hajec, Donald
• Assistant Examiner(s): Le, Thien Minh
• Application Number:
  US08/264,642
• Time in Patent Office: 502 Days
• Field of Search: 235/456, 235/494, 235/454, 235/469, 235/437, 235/432, 235/470, 380/55, 369/100, 511/43, 341/95
• US Class Current: 235/494
• CPC Class Codes: G06K 19/06037 multi-dimensional coding
• CPC Class Codes: G06K 2019/06262 with target- or other orientation-indicating feature
• CPC Class Codes: G06K 7/14 using light without selection of wavelength, e.g. sensing reflected white light G06K7/10831 - G06K7/1097 take precedence

Abstract

A machine readable binary code which is dynamically variable in size, format and density of information is provided. The binary code is formed as a matrix having a perimeter and data contained therein. The perimeter is provided with density indicia for indicating the density of data contained within the matrix. The perimeter is also provided with size indicia for indicating the size of the matrix. By utilizing the density indicia and size indicia, a scanning device is able to calculate the size and information density of the binary code.

Claims

1. A method for determining the location and orientation of a machine optically readable code formed of a plurality of data elements, the code having an identifiable perimeter, comprising the steps of:

scanning an image including said code;

converting said scanned image into a digitized image; and

conducting a binary search of said digitized image to locate said identifiable perimeter and calculating the position of each data element cell relative to said identifiable perimeter.

2. The method of claim 1, wherein the binary search includes the step of searching the digitized image for a user definable pattern sequence.

3. The method of claim 1, further comprising providing said identifiable perimeter with at least a first solid line and a second solid line intersecting said first solid line thereby forming a first corner.

4. The method of claim 3, further comprising the steps of measuring the length of said first solid line, measuring the length of said second solid line, measuring the angle at which said first solid line intersects said second line, and calculating the position of a second corner of said perimeter opposite said first corner.

5. The method of claim 1 wherein the scanning step further comprises providing a light sensitive device, detecting radiation reflected from a visual field containing the code, and forming a two-dimensional electronic representation of the visual field in response to the detected reflected radiation.

6. The method of claim 5 wherein the step of detecting radiation further comprises illuminating the visual field with radiation, wherein the detected reflected radiation is responsive to the illuminating radiation.

7. The method of claim 5 wherein the step of detecting radiation further comprises generating laser radiation, illuminating the visual field with said laser radiation, and detecting the radiation reflected in response to the laser radiation.

8. The method of claim 5 wherein the step of detecting radiation further comprises providing a light sensitive electronic array and capturing electronic data corresponding to a two-dimensional image of the visual field.

9. The method of claim 8 wherein the step of providing a light sensitive array further comprises providing light sensitive area array and a lens, focussing an image of the visual field on the area array, and capturing a two-dimensional electronic representation of the scanned visual field.

10. The method of claim 9 wherein providing a light sensitive area array and a lens further comprises providing an optical CCD camera.

11. The method of claim 8 wherein the step of providing a light sensitive array further comprises providing a linear array, and moving the linear array across the visual field and capturing a two-dimensional electronic representation of the visual field in response to said movement.

12. The method of claim 6 wherein the step of detecting radiation further comprises providing a light sensitive electronic array and capturing electronic data corresponding to a two-dimensional image of the visual field.

13. The method of claim 12 wherein the step of providing a light sensitive array further comprises providing light sensitive area array and a lens, focussing an image of the visual field on the area array, and capturing a two-dimensional electronic representation of the scanned visual field.

14. The method of claim 13 wherein providing a light sensitive area array and a lens further comprises providing an optical CCD camera.

15. The method of claim 12 wherein the step of providing a light sensitive array further comprises providing a linear array, and moving the linear array across the visual field and capturing a two-dimensional electronic representation of the visual field in response to said movement.

24. The apparatus of claim 1 wherein the optically scanning means further comprises a light sensitive electronic array.

25. The apparatus of claim 24 wherein the light sensitive electronic array further comprises a light sensitive area array and a lens to focus an image of the visual field onto the area array, wherein a two-dimensional image is captured by the area array.

26. The apparatus of claim 25 wherein the light sensitive area array and lens further comprise an optical CCD camera.

27. The apparatus of claim 25 wherein the light sensitive array further comprises a light sensitive linear array, wherein a two-dimensional image is captured in response to the linear array being moved across the visual field.

16. Apparatus for scanning a machine optically readable binary code in a computer binary language code comprising:

means for scanning an image field containing a machine readable binary code;

means for receiving a scanned image field containing a machine readable code in computer binary language code, said code being formed of a plurality of data elements forming a bit stream arranged in a two dimensional spatial array, each data element being in one of two visual states; and

means for converting said data elements to electronic binary values forming an electronic computer binary language code.

17. The apparatus of claim 16 wherein the scanning means further comprising means for optically scanning a visual field.

18. The apparatus of claim 17 wherein the optically scanning means further comprises a source of radiation directed to illuminate the visual field, wherein the optically scanning means detects radiation reflected from the visual field in response to the illuminating radiation.

19. The apparatus of claim 18 wherein the optically scanning means further comprises a laser reader having a source of laser radiation and means for illuminating the visual field with the laser radiation.

20. The apparatus of claim 17 wherein the optically scanning means further comprises a light sensitive electronic array.

21. The apparatus of claim 20 wherein the light sensitive electronic array further comprises a light sensitive are array and a lens to focus an image of the visual field onto the area array, wherein a two-dimensional image is captured by the area array.

22. The apparatus of claim 21 wherein the light sensitive area array and lens further comprise an optical CCD camera.

23. The apparatus of claim 20 wherein the light sensitive array further comprises a light sensitive linear array, wherein a two-dimensional image is captured in response to the linear array being moved across the visual field.