Patent ID: 9443318
Filing Date: 2016-09-13
CPC Classification: G06K,G06T

Claim Text:
1. A detection apparatus for detecting a line segment in a specified image, comprising: a feature quantity calculating part configured to determine a feature quantity of each point in the specified image; a Hough transform part configured to convert a straight line that passes through an arbitrary point in the specified image to a value set of coordinates (θ,ρ) in a Hough space by representing an arbitrary straight line in the specified image using a length ρ of a perpendicular extending from a reference point of the specified image to the arbitrary straight line in the specified image and an angle θ formed by the perpendicular with a reference axis that passes through the reference point; a counting part configured to add a value weighted by a feature quantity of a point in the specified image to a count in a storage entry corresponding to a value set of coordinates (θ,ρ) in the Hough space to which the point in the specified image is converted by the Hough transform part, each point in the specified image having an individual feature quantity which weights a particular value to be added to a count corresponding to a value set of coordinates (θ,ρ) in the Hough space to which the each point is converted by the Hough transform part; and a detection part configured to detect the straight line in the specified image by identifying a value set of coordinates (θ,ρ) for which the count exceeds a first threshold, wherein the feature quantity calculating part determines a contour intensity represented by the feature quantity of the point in the specified image by performing contour extraction.