MOTION DETECTION METHOD WITH USER-ADJUSTABLE PARAMETERS FOR BETTER DETECTION ACCURACY

• US 20030165198A1
• Filed: 02/25/2003
• Published: 09/04/2003
• Est. Priority Date: 03/01/2002
• Status: Abandoned Application

• Current Assignee: Huper Laboratories Co., Ltd.
• Original Assignee: Huper Laboratories Co., Ltd.
• Inventors: CHEN, HSIAO-PING, KAO, CHENG-LIANG
• Application Number:
  US10/248,851
• Publication Number:
  US 20030165198A1
• Time in Patent Office: Days
• US Class Current: 375/240.29
• CPC Class Codes: H04N 7/18 Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

Abstract

A motion detection method based on a detecting system is used to detect a moving object and trigger a corresponding event through a set of consecutive frames. The motion detection method includes comparing duration of the event with a first threshold value for determining whether the event is valid, comparing an interval between two successive events for determining whether the latter of the successive events is combined with the first of the events, and comparing size of the moving object with a predetermined rectangle for determining whether the moving object meets a size limitation of the predetermined rectangle.

Claims

1. A motion detection method used by a detecting system for detecting a plurality of moving objects moving inside a scene, the detecting system comprising:

a frame generator for periodically picturing the scene according to a predetermined period to generate a plurality of image frames; and

a calculating device for comparing successive image frames to detect the moving objects inside the scene and to generate an event corresponding to the moving objects, the event comprising image frames associated with the moving objects;

the motion detection method comprising;

comparing a duration of the event with a first threshold value to determine whether the event is valid.

2. The motion detection method of claim 1 wherein if the duration of the event is longer than the first threshold value, the event is valid and is recorded by the detecting system;

otherwise, the event is not valid and is not recorded by the detecting system.

3. The motion detection method of claim 1 wherein the detecting system detects a plurality of successful events which comprises a first event and a second event, the first event is generated prior to the second event, and there is an interval between a termination of the first event and a beginning of the second event;

the motion detection method further comprising;

comparing the interval with a second threshold value to determine whether the second event is related to the first event for merging the second event into the first event.

4. The motion detection method of claim 3 wherein if the interval is shorter than the second threshold value, the second event is merged into the first event, and the detecting system only records the first event, which includes image frames generated within the durations of the first and second events and the interval between the first and second events, and if the interval is longer than the second threshold value, the second event is not related to the first event, and the detecting system records both the first event and the second event.

5. The motion detection method of claim 1 further comprising:

setting at least a filtering range; and

comparing a size of the moving objects with the filtering range to determine whether the detecting system records an event associated with the moving objects.

6. The motion detection method of claim 5 wherein if the size of the moving objects is larger than the filtering range, the detecting system ignores the moving objects without recording the event associated with the moving objects.

7. The motion detection method of claim 5 wherein if the size of the moving objects is smaller than the filtering range, the detecting system ignores the moving objects without recording the event associated with the moving objects.

8. The motion detection method of claim 5 wherein the filtering range is a rectangle.

9. A motion detection method used by a detecting system for detecting moving objects moving inside a scene, the detecting system comprising:

a frame generator for periodically picturing the scene according to a predetermined period and generating a plurality of image frames; and

a calculating device for comparing successive image frames to detect the moving objects inside the scene and to generate an event corresponding to the moving objects, the event comprising image frames associated with the moving objects;

the motion detection method comprising;

detecting a plurality of successful events which comprises a first event and a second event, the first event being generated prior to the second event, an interval separating a termination of the first event and a beginning of the second even; and

comparing the interval with a second threshold value to determine whether the second event is related to the first event for merging the second event into the first event.

10. The motion detection method of claim 9 wherein if the interval is shorter than the second threshold value, the second event is merged into the first event, and the detecting system only records the first event, which includes image frames generated within the durations of the first and second events and the interval between the first and second events, and if the interval is longer than the second threshold value, the second event is not related to the first event, and the detecting system records both the first event and the second event.

11. The motion detection method of claim 9 further comprising:

comparing a duration of the event with a first threshold value to determine whether the event is valid.

12. The motion detection method of claim 11 wherein if the duration of the event is longer than the first threshold value, the event is valid and is recorded by the detecting system;

otherwise, the event is not valid and is not recorded by the detecting system.

13. The motion detection method of claim 9 further comprising:

setting at least a filtering range; and

comparing a size of the moving objects with the filtering range to determine whether the detecting system records an event associated with the moving objects.

14. The motion detection method of claim 13 wherein if the size of the moving objects is larger than the filtering range, the detecting system ignores the moving objects without recording the event associated with the moving objects.

15. The motion detection method of claim 13 wherein if the size of the moving objects is smaller than the filtering range, the detecting system ignores the moving objects without recording the event associated with the moving objects.

16. The motion detection method of claim 13 wherein the filtering range is a rectangle.

17. A motion detection method used by a detecting system for detecting moving objects moving inside a scene, the detecting system comprising:

a frame generator for periodically picturing the scene according to a predetermined period to generate a plurality of image frames; and

a calculating device for comparing successive image frames to detect the moving objects inside the scene and to generate an event corresponding to the moving objects, the event comprising image frames associated with the moving objects;

the motion detection method comprising;

setting at least a filtering range; and

comparing a size of the moving objects with the filtering range to determine whether the detecting system records an event associated with the moving objects.

18. The motion detection method of claim 17 wherein if the size of the moving objects is larger than the filtering range, the detecting system ignores the moving objects without recording the event associated with the moving objects.

19. The motion detection method of claim 17 wherein if the size of the moving objects is smaller than the filtering range, the detecting system ignores the moving objects without recording the event associated with the moving objects.

20. The motion detection method of claim 17 wherein the filtering range is a rectangle.

21. The motion detection method of claim 17 further comprising:

comparing a duration of the event with a first threshold value to determine whether the event is valid.

23. The motion detection method of claim 17 wherein the detecting system detects a plurality of successful events which comprises a first event and a second event, the first event is generated prior to the second event, and there is an interval between a termination of the first event and a beginning of the second event;

the motion detection method further comprising;

comparing the interval with a second threshold value to determine whether the second event is related to the first event for merging the second event into the first event.

24. The motion detection method of claim 23 wherein if the interval is shorter than the second threshold value, the second event is merged into the first event, and the detecting system only records the first event, which includes image frames generated within the durations of the first and second events and the interval between the first and second events, and if the interval is longer than the second threshold value, the second event is not related to the first event, and the detecting system records both the first event and the second event.

22. The motion detection method of claim 22 wherein if the duration of the event is longer than the first threshold value, the event is valid and is recorded by the detecting system;

otherwise, the event is not valid and is not recorded by the detecting system.