Method Of Generating Interface Surface Having Rotationally Symmetric Coded Data

• US 20090212118A1
• Filed: 05/04/2009
• Published: 08/27/2009
• Est. Priority Date: 09/17/1999
• Status: Active Grant

• Current Assignee: Silverbrook Research Pty Limited
• Original Assignee: Silverbrook Research Pty Limited
• Inventors: Silverbrook, Kia, Lapstun, Paul
• Granted Patent: US 7,715,662 B2
• Time in Patent Office: Days
• US Class Current: 235/494
• CPC Class Codes: G06F 3/0321 by optically sensing the absolute position with respect to a regularly patterned surface forming a passive digitiser, e.g. pen optically detecting position indicative tags printed on a paper sheet constructional details of pen-shaped pointing devices G06F3/03545, G06F3/03542, G06F3/037
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06K 19/06046 Constructional details
• CPC Class Codes: G06K 19/06075 the marking containing means for error correction

Abstract

A method of generating an interface surface is provided in which machine-readable coded data is generated to be arranged in accordance with a layout having n-fold rotational symmetry about a center of rotation, where n is at least two, the layout including n identical sub-layouts rotated 1/n revolutions apart about the center of rotation, each sub-layout defining the position of data elements, and including rotation-indicating data that distinguishes that sub-layout from at least one other sub-layout, and the coded data is printed onto a surface to generate an interface surface.

Claims

1. A method of generating an interface surface comprising the steps of:

generating machine-readable coded data to be arranged in accordance with a layout having n-fold rotational symmetry about a center of rotation, where n is at least two, the layout including n identical sub-layouts rotated 1/n revolutions apart about the center of rotation, each sub-layout defining the position of data elements, and including rotation-indicating data that distinguishes that sub-layout from at least one other sub-layout; and

printing the coded data onto a surface to generate an interface surface.

2. A method according to claim 1, wherein the coded data being substantially invisible to the unaided human eye.

3. A method according to claim 1, wherein the printing step comprises printing visible markings on the surface substantially simultaneously with the coded data.

4. A method according to claim 1, wherein the sub-layouts are arranged such that each data element has a unique position.

5. A method according to claim 1, wherein the positions of the data elements of respective sub-layouts are interleaved.

6. A method according to claim 1, wherein the coded data has a plurality of layouts, each layout having at least one codeword that is different to at least one codeword of at least one other layout.