Apparatus and method for monitoring moving objects in sensing area

• US 9,766,056 B2
• Filed: 03/19/2014
• Issued: 09/19/2017
• Est. Priority Date: 03/29/2013
• Status: Active Grant

• Current Assignee: DENSO Corporation, Denso PS Corporation (DENSO Corporation)
• Original Assignee: DENSO Corporation, Denso PS Corporation (DENSO Corporation)
• Inventors: Takiguchi, Masahiro, Iwasaki, Tetsuya
• Primary Examiner(s): Gray, Sunghee Y
• Application Number:
  US14/780,887
• Publication Number:
  US 20160040979A1
• Time in Patent Office: 1,280 Days
• Field of Search: 356614
• CPC Class Codes: G01B 11/00 Measuring arrangements characterised by the use of optical techniques
• CPC Class Codes: G01P 13/045 with speed indication
• CPC Class Codes: G01P 3/36 Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light G01P3/68 takes precedence; gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams G01C19/64
• CPC Class Codes: G01S 17/42 Simultaneous measurement of distance and other co-ordinates indirect measurement G01S17/46
• CPC Class Codes: G01S 17/58 Velocity or trajectory determination systems; Sense-of-movement determination systems
• CPC Class Codes: G08B 13/187 by interference of a radiation field

Abstract

In a monitoring apparatus, an optical sensor senses objects present in a sensing area, and moving speeds and moving directions of the objects are calculated based on changes with time in positional information of the sensed objects. An object which meets a predetermined moving condition is determined as a moving object. Hence an entrance of the moving object into the sensing area can be monitored. In this apparatus, by a determining section, it is determined whether or not an object is sensed in an area (after-passage sensing area) which is set to include positions adjacent to positions through which the sensed moving object has passed. When the object has been sensed in the area, by the determining section, it is further determined whether or not the object has remained for a predetermined determination period of time or more. This determined result is outputted by an outputting section.

Claims

1. An apparatus for monitoring objects, comprising a processor configured to function as:

an object detecting unit that detects objects in a sensing area by an optical sensor and calculates moving speeds and moving directions of the detected objects based on changes in positional information with time of the detected objects;

a moving object determining unit that determines, of the objects detected by the object detecting unit, moving objects that meet a predetermined moving condition;

an object-stay determining unit that determines whether or not another object is sensed in an after-passage sensing area that is set to each of the moving objects and whether or not, when the other object is sensed in the after-passage sensing area, the sensed other object has stayed at a sensed position in the after-passage sensing area for a predetermined period of time or more, the after-passage sensing area being set as a predetermined size area through which the corresponding moving object has passed; and

an outputting unit that outputs results determined by the object-stay determining unit.

2. The apparatus of claim 1, wherein the after-passage sensing area is set to include an undetectable area that prohibits detection due to interruption of the optical sensor during the detection of the objects by the object detecting unit.

3. The apparatus of claim 1, wherein the after-passage sensing area for each of the moving objects is set to follow the moving object and has an area reachable by movable portions of the moving object.

4. The apparatus of claim 2, wherein the after-passage sensing area for each of the moving objects is set to follow the moving object and has an area reachable by movable portions of the moving object.

5. A method of monitoring a moving object, comprising:

detecting objects in a sensing area by an optical sensor and calculating moving speeds and moving directions of the detected objects based on changes in positional information with time of the detected objects;

first determining, of the objects detected, moving objects that meet a predetermined moving condition;

second determining whether or not another object is sensed in an after-passage sensing area that is set to each of the moving objects and whether or not, when the other object is sensed in the after-passage sensing area, the sensed other object has stayed at a sensed position in the after-passage sensing area for a predetermined period of time or more, the after-passage sensing area being set as a predetermined size area through which the corresponding moving object has passed; and

outputting results determined by the second determining step.

6. The method of claim 5, wherein the after-passage sensing area for each of the moving objects is set to follow the moving object and has an area reachable by movable portions of the moving object.

7. An apparatus for monitoring objects, comprising a processor configured to implement the steps of:

sensing objects in a sensing area by an optical sensor and calculating moving speeds and moving directions of the sensed objects based on changes in positional information with time of the sensed objects;

first determining, of the sensed objects, moving objects that meet a predetermined moving condition;

second determining whether or not another object is sensed in an after-passage sensing area that is set to each of the moving objects and whether or not, when the other object is sensed in the after-passage sensing area, the sensed other object has stayed at a position in the after-passage sensing area for a predetermined period of time or more, the after-passage sensing area being set as a predetermined size area through which the corresponding moving object has passed; and

outputting results determined by the second determining step.

8. The apparatus of claim 7, wherein the after-passage sensing area for each of the moving objects is set to follow the moving object and has an area reachable by movable portions of the moving object.