Information insertion method, information extraction method, and information extraction apparatus using dot-based information robust to geometric distortion
First Claim
Patent Images
1. An information extraction method, comprising:
- identifying a set of at least one dot output to a target;
extracting information from the set of at least one dot; and
performing correction on geometric distortion of the set of at least one dot, wherein;
performing correction on the geometric distortion comprises performing correction on projection and rotation distortion of the set of at least one dot;
performing correction on the projection and rotation distortion comprises detecting four reference dots in a region of the set of at least one dot and performing correction on the projection and rotation distortion using the four reference dots; and
performing correction on the projection and rotation distortion comprises generating a set of horizontal lines and a set of vertical lines passing through the at least one dot, extracting two horizontal lines from the set of horizontal lines, and extracting two vertical lines from the set of vertical lines;
the four reference dots are intersections of the two horizontal lines and the two vertical lines;
the two horizontal lines comprise a horizontal line closest to an origin and a horizontal line farthest from the origin; and
the two vertical lines comprise a vertical line closest to the origin and a vertical line farthest from the origin.
1 Assignment
0 Petitions
Accused Products
Abstract
An information insertion method, an information extraction method, and an information extraction apparatus using dot-based information are provided herein. The information extraction apparatus includes an identification unit and an extraction unit. The identification unit identifies a set of at least one dot output to a target. The extraction unit extracts information from the set of at least one dot.
12 Citations
10 Claims
-
1. An information extraction method, comprising:
-
identifying a set of at least one dot output to a target; extracting information from the set of at least one dot; and performing correction on geometric distortion of the set of at least one dot, wherein; performing correction on the geometric distortion comprises performing correction on projection and rotation distortion of the set of at least one dot; performing correction on the projection and rotation distortion comprises detecting four reference dots in a region of the set of at least one dot and performing correction on the projection and rotation distortion using the four reference dots; and performing correction on the projection and rotation distortion comprises generating a set of horizontal lines and a set of vertical lines passing through the at least one dot, extracting two horizontal lines from the set of horizontal lines, and extracting two vertical lines from the set of vertical lines; the four reference dots are intersections of the two horizontal lines and the two vertical lines; the two horizontal lines comprise a horizontal line closest to an origin and a horizontal line farthest from the origin; and the two vertical lines comprise a vertical line closest to the origin and a vertical line farthest from the origin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. An information extraction apparatus, comprising:
-
a hardware processor configured to identify a set of at least one dot output to a target, to extract information from the set of at least one dot, and to perform correction on size distortion of the set of at least one dot by; generating a cumulative value in a horizontal and a cumulative value in a vertical direction by accumulating values of the central coordinates of the at least one dot in the horizontal direction and the vertical direction; detecting a horizontal period and a vertical period, in which the at least one dot appears, by analyzing the cumulative value in the horizontal direction and the cumulative value in the vertical direction; and correcting an image of the set of at least one dot so that the horizontal period and the vertical period match an original period.
-
Specification