Method and apparatus for detecting and decoding bar code symbols using two-dimensional digital pixel images
First Claim
Patent Images
1. A method for detecting a bar code symbol with a bar code symbol reader, comprising the steps of:
- (a) receiving a two-dimensional image containing said symbol, wherein said bar code symbol reader has no a priori knowledge of the orientation of said symbol in said image;
(b) scanning said image in one dimension to locate a quiet zone for said symbol; and
(c) searching said image in one dimension to identify a start/stop character of said symbol using subpixel interpolation.
1 Assignment
0 Petitions
Accused Products
Abstract
A system for detecting a bar code symbol receives a two-dimensional image containing the symbol, where the system has no a priori knowledge of the orientation of the symbol in the image. The system scans the image in one dimension to locate a quiet zone for the symbol and searches the image in one dimension to identify a start/stop character of the symbol.
-
Citations
42 Claims
-
1. A method for detecting a bar code symbol with a bar code symbol reader, comprising the steps of:
-
(a) receiving a two-dimensional image containing said symbol, wherein said bar code symbol reader has no a priori knowledge of the orientation of said symbol in said image; (b) scanning said image in one dimension to locate a quiet zone for said symbol; and (c) searching said image in one dimension to identify a start/stop character of said symbol using subpixel interpolation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An apparatus for detecting a bar code symbol, comprising:
-
(a) means for receiving a two-dimensional image containing said symbol, wherein said apparatus has no a priori knowledge of the orientation of said symbol in said image; (b) scanning means for scanning said image in one dimension to locate a quiet zone for said symbol; and (c) searching means for searching said image in one dimension to identify a start/stop character of said symbol using subpixel interpolation. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A method for detecting a bar code symbol with a bar code symbol reader, comprising the steps of:
-
(a) receiving a two-dimensional image containing said symbol, wherein said bar code symbol reader has no a priori knowledge of the orientation of said symbol in said image; (b) scanning said image in one dimension to locate a quiet zone for said symbol; and (c) searching said image in one dimension to identify a start/stop character of said symbol, wherein said scanning is performed at low resolution and said searching is performed at high resolution. - View Dependent Claims (16, 17, 18, 19, 20, 21)
-
-
22. An apparatus for detecting a bar code symbol, comprising:
-
(a) means for receiving a two-dimensional image containing said symbol, wherein said apparatus has no a priori knowledge of the orientation of said symbol in said image; (b) scanning means for scanning said image in one dimension to locate a quiet zone for said symbol; and (c) searching means for searching said image in one dimension to identify a start/stop character of said symbol, wherein said scanning means scans at low resolution and said searching means searches at high resolution. - View Dependent Claims (23, 24, 25, 26, 27, 28)
-
-
29. A method for detecting a bar code symbol with a bar code symbol reader, comprising the steps of:
-
(a) receiving a two-dimensional image containing said symbol, wherein said bar code symbol reader has no a priori knowledge of the orientation of said symbol in said image; (b) scanning said image in one dimension to locate a quiet zone for said symbol; (c) searching said image in one dimension to identify a start/stop character of said symbol; (d) locating first and second corners of said symbol; (e) scanning said image to locate a second quiet zone for said symbol; (f) searching said image to identify a second start/stop character of said symbol; and (g) locating third and fourth corners of said symbol. - View Dependent Claims (30, 31, 32, 33, 34, 35)
-
-
36. An apparatus for detecting a bar code symbol, comprising:
-
(a) means for receiving a two-dimensional image containing said symbol, wherein said apparatus has no a priori knowledge of the orientation of said symbol in said image; (b) scanning means for scanning said image in one dimension to locate a quiet zone for said symbol; (c) searching means for searching said image in one dimension to identify a start/stop character of said symbol; (d) means for locating first and second corners of said symbol; (e) means for scanning said image to locate a second quiet zone for said symbol; (f) means for searching said image to identify a second start/stop character of said symbol; and (g) means for locating third and fourth corners of said symbol. - View Dependent Claims (37, 38, 39, 40, 41, 42)
-
Specification