Back to results
US 2003/0076544 A1Published application
Scanning device capable of calibrating step angle errors
AssigneeAvision Inc.
InventorMichael Chen
Life of this patent
Estimating the term…
Abstract
A scanner includes a housing, a transparent platform, a scanning module, a motor and a calibration paper. The transparent platform is installed on the housing for a document to be placed on. The scanning module is moveably installed inside the housing for scanning the document. The motor is installed inside the housing for driving the scanning module. The calibration paper is installed at a front end of the housing and has a graph for calibrating step angle errors of the motor.
Claims9
A scanner comprising:
- a housing;
- a transparent platform installed on the housing for a document to be placed on;
- a scanning module moveably installed inside the housing for scanning the document;
- a motor installed inside the housing for driving the scanning module;
- and
- a calibration paper installed at a front end of the housing, the calibration paper having a graph for calibrating step angle errors of the motor;
- wherein the scanning module scans the graph before scanning the document, and calibrates an image generated by scanning the document according to differences between an image generated by scanning the graph and a true image of the graph.
4 more elements
Dependencies are inferred from the claim text.