Moving body measuring device and an image processing device for measuring traffic flows

• US 5,691,902 A
• Filed: 10/07/1996
• Issued: 11/25/1997
• Est. Priority Date: 03/19/1991
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation), Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Taniguchi, Hiroyasu, Seki, Akinobu, Furusawa, Haruki, Hatakenaka, Jun
• Primary Examiner(s): PARK, COLLIN
• Application Number:
  US08/726,945
• Time in Patent Office: 414 Days
• Field of Search: 364/436, 364/438, 364/437, 348/143, 348/148, 348/149, 348/135
• US Class Current: 701/119
• CPC Class Codes: G01S 11/12 using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 3/7864 T.V. type tracking systems
• CPC Class Codes: G08G 1/04 using optical or ultrasonic detectors

Abstract

A moving body measuring device, having an image taking unit for taking an image of a moving body, a controller for controlling the image taking unit and a frame memory for memorizing an image data of the image of the image taking unit, which processes the image data, detects the moving body and obtains an information of the moving body which comprises an existence domain setting circuit for previously setting an existence domain of the moving body extended along a moving path of the moving body based on the image data, a sampling circuit for sampling a data showing the moving body based on the image data in the existence domain, and a timewise data accumulating circuit for timewisely and continuously accumulating at every constant period, the data showing the moving body sampled by the sampling circuit which detects a timewise change of the moving body moving in the previously set existence domain.

Claims

1. An image processing device for measuring traffic flows which comprises:

means for taking an image;

a frame memory for storing a plurality of image data elements that define the image;

means for selecting a set of image data elements from the plurality of image data elements, the selected set of image data elements being indicative of a portion of the image within an existence domain, the existence domain defining an intended vehicle path in the image;

means for selecting vehicle data representing potential vehicles from the set of image data elements, the vehicle data defining line edges;

means for generating information that defines one of a center of gravity value and a width based upon the vehicle data defining the line edges, and preserving the information;

means for selecting projection data from the vehicle data based on the information from the means for generating and preserving;

accumulating means for timewisely accumulating the projection data selected by the means for selecting the projection data;

vehicle determining means for determining the existence of a vehicle moving in the portion of the image within the existence domain based on the timewisely accumulated projection data;

a vehicle motion detecting device for detecting a behavior of the vehicle determined by the vehicle determining means based on said generated information defining one of the center of gravity value and the width; and

means for measuring state quantities of the vehicle determined by the vehicle determining means.

2. The device of claim 1, further comprising a binarizing circuit for receiving the timewisely accumulated projection data and for forming two-dimensional locus data indicating timewise movement of the vehicle, the two-dimensional locus data having one of a first value and a second value.

3. The device of claim 2, wherein a portion of the locus data defines a hole, wherein the portion of the locus data has the second value and is bound by other portions of the locus data having the first value, and wherein the device further comprises a hole-filling circuit that recognizes the hole defined by the portion of the locus data having the second value, and reassigns the portion of the locus data having the second value to the first value to fill the hole.

4. The device of claim 1, wherein the vehicle motion detecting device includes means for determining a speed of the vehicle based on the timewisely accumulated projection data.

5. The device of claim 1, wherein the vehicle motion detecting device includes means for determining an inter-vehicle distance from three-dimensional position information of a starting point and an end point based on the timewisely accumulated projection data.