Abstract

An apparatus for passively measuring vehicle speed includes at least one video camera or acquiring images of a roadway upon which at least one moving vehicle travels upon, each of the images comprising a plurality of pixels. A computer processes pixel data associated with the plurality of pixels, including using a adaptive background subtraction model to perform background subtraction on the pixel data to identify a plurality of foreground pixels, extracting a plurality of blobs from the foreground pixels, and rectifying the blobs to form a plurality of rectified blobs using a homography matrix. The homography matrix is obtained by comparing at least one known distance in the roadway with distances between the pixels. Using a planar homography transform, the moving vehicle is identified from the plurality of rectified blobs, wherein the respective ones of the plurality of rectified blobs include vehicle data associated with the moving vehicle.The speed of the moving vehicle is computed from the vehicle data.

Document Type

Patent

Patent Number

US 8,238,610 B2

Application Serial Number

12/642,719

Issue Date

8-7-2012

Current Assignee

UCFRF

Assignee at Issuance

UCFRF

College

College of Engineering and Computer Science (CECS)

Department

Computer Science

Allowance Date

6-11-2012

Filing Date

12-18-2009

Assignee at Filing

UCFRF

Filing Type

Nonprovisional Application Record

Donated

no

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