Moving object detection apparatus and method

• US 5,177,794 A
• Filed: 03/25/1991
• Issued: 01/05/1993
• Est. Priority Date: 03/26/1990
• Status: Expired due to Term

• Current Assignee: Toshiba Corporation
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Abe, Shozo, Ohata, Hajime, Togashi, Yuichi
• Primary Examiner(s): Mancuso, Joseph
• Application Number:
  US07/674,405
• Time in Patent Office: 652 Days
• Field of Search: 382/48, 382/22, 382/44, 382/50, 382/51, 382/52, 382/6, 382/30, 382/34, 382/, 382/18, 382/9, 358/105, 358/108
• US Class Current: 382/107
• CPC Class Codes: G06T 7/246 using feature-based methods, e.g. the tracking of corners or segments
• CPC Class Codes: G06V 10/421 by analysing segments intersecting the pattern
• CPC Class Codes: G08B 13/19602 Image analysis to detect motion of the intruder, e.g. by frame subtraction
• CPC Class Codes: G08B 13/19613 Recognition of a predetermined image pattern or behaviour pattern indicating theft or intrusion

Abstract

A moving object detection apparatus is disclosed and includes a TV camera for capturing images in a monitoring zone. An image changing area is defined within a rectangular region, and is extracted from image signals corresponding to the images captured by the TV camera. From the image changing area, horizontal projective data is obtained. The horizontal projective data is compared with a standard horizontal projective data corresponding to a standard moving object to distinguish the moving object.

Claims

1. An apparatus for detecting a moving object in a monitoring zone, the apparatus comprising:

input means for inputting image signals from the monitoring zone;

extraction means for extracting an image changing area from the image signals, the image changing area is defined as a rectangular region which encloses, or circumscribes, the moving object;

data means for obtaining projective data from the extracted image changing area by projecting in a horizontal or in a vertical direction of the rectangular region;

memory means for storing standard projective data corresponding to a standard moving object to be compared to a detected moving object; and

comparison means for comparing the projective data obtained by the data means with the standard projective data from the memory means to identify the moving object.

2. The apparatus of claim 1 wherein the extraction means includes means for forming a subtracted image from the image signals input by the input means at different times.

3. The apparatus of claim 1 wherein the standard projective data represents the degree of frequency of appearance of the projective data and includes a margin for the projective pattern in the horizontal direction.

4. The apparatus of claim 3 wherein the standard projective data is produced from images of a plurality of moving objects input by the input means.

5. The apparatus of claim 1 wherein the memory means includes a dictionary table containing first data to be assigned high values representing the first data close to the standard moving object and second data to be assigned low values representing the second data apart from the standard moving object.

6. An apparatus for detecting a person in a monitoring zone, the apparatus comprising:

input means for inputting image signals from the monitoring zone;

extraction means for extracting an image changing area from the image signals, the image changing area is defined as a rectangular region which includes a moving object;

data means for obtaining projective data from the rectangular region by projecting in a horizontal direction, the projective data having predetermined numerical values in a vertical direction;

memory means for storing standard projective data corresponding to standard person characteristics, the standard projective data having predetermined numerical values in the vertical direction;

comparison means for comparing each value of the projective data obtained by the obtaining means with corresponding values of the standard projective data from the memory means; and

determining means for determining whether the moving object is a person or not, in accordance with a result of the comparison means.

7. The apparatus of claim 6 wherein the extracting means includes means for forming a subtracted image from the image signals input by the input means at different times.

8. The apparatus of claim 6 wherein the standard projective data represents the degree of frequency of appearance of the projective data and includes a margin for the projective pattern in the horizontal direction.

9. The apparatus of claim 8 wherein the standard projective data is produced from images of a plurality of persons input by the input means.

10. The apparatus of claim 6 wherein the memory means includes a dictionary table containing first data to be assigned high values representing the first data close to the standard moving object and second data to be assigned low values representing the second data apart from the standard moving object.

11. A method for detecting a moving object, to be determined to be a person or not, by the comparison of the image of the moving object with a standard projective data corresponding to a standard person image which is previously prepared, the method comprising the steps of:

capturing images in a monitored zone by using a TV camera;

inputting images from the TV camera to generate image signals corresponding to the monitored zone;

extracting an image changing area distinguished by a moving object from the image signals;

defining a rectangular region including the changing image portion in the rectangular region;

obtaining projective data from the rectangular region by projecting to a horizontal direction;

comparing the projective data obtained by the obtaining step with the standard projective data; and

determining whether or not the moving object is a person in accordance with a comparing step.