METHOD AND APPARATUS FOR CORRECTION OF PERSPECTIVE DISTORTION

• US 20070280554A1
• Filed: 07/02/2007
• Published: 12/06/2007
• Est. Priority Date: 02/17/2004
• Status: Active Grant

• Current Assignee: Corel Corporation (Corel Holdings LP)
• Original Assignee: Corel Corporation (Corel Holdings LP)
• Inventors: Zaklika, Krzysztof, Chernichenko, Dmitry
• Granted Patent: US 7,737,967 B2
• Time in Patent Office: Days
• US Class Current: 382/275
• CPC Class Codes: G06T 2207/20104 Interactive definition of region of interest [ROI]
• CPC Class Codes: G06T 5/80 Geometric correction
• CPC Class Codes: G06T 7/536 from perspective effects, e.g. by using vanishing points

Abstract

Perspective distortion in an imaged scene is corrected by identifying a group of points in the imaged scene such that the group of points define a shape. Two vanishing points are determined based on the group of points in the imaged scene. The process determines a first set of reference points within the shape defined by the group of points and transforms the first set of reference points into a second set of reference points. An aspect ratio associated with the first set of reference points is adjusted and the imaged scene is transformed to reduce perspective distortion in the imaged scene.

Claims

1. A method of correcting perspective distortion in an image, the method comprising:

identifying a plurality of points in the image;

determining two vanishing points associated with the plurality of points;

defining a reference rectangle centered about a singular reference point, the singular reference point being bounded within the plurality of points;

determining a set of reference points within the reference rectangle, each reference point being located at an intersection of two lines, each line connecting a point on the reference rectangle to one of the vanishing points, the set of reference points having an aspect ratio;

transforming the reference rectangle to have the aspect ratio of the set of reference points, so as to generate a modified reference rectangle;

mapping the set of reference points onto the modified reference rectangle to generate a new image.