Method and apparatus for detecting motion in MPEG video streams
First Claim
Patent Images
1. A method of detecting motion in a video image comprising the steps of:
- connecting an MPEG compliant encoder to a video source that provides video images;
compressing the video data in the video images and generating a compressed video image bit stream having a motion compensation component;
receiving the generated compressed video image bit stream;
comparing the motion compensation component to a threshold value; and
indicating that motion has occurred if the motion compensation component is greater than the threshold value.
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Abstract
A method of detecting motion in a video image comprising the steps of connecting an MPEG compliant encoder to a video source that provides video images, compressing the video data in the video images and generating a compressed video image bit stream having a motion compensation component, receiving the generated compressed video image bit stream, comparing the motion compensation component to a threshold value, and indicating that motion has occurred if the motion compensation component is greater than the threshold value.
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Citations
18 Claims
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1. A method of detecting motion in a video image comprising the steps of:
- connecting an MPEG compliant encoder to a video source that provides video images;
compressing the video data in the video images and generating a compressed video image bit stream having a motion compensation component;
receiving the generated compressed video image bit stream;
comparing the motion compensation component to a threshold value; and
indicating that motion has occurred if the motion compensation component is greater than the threshold value.
- connecting an MPEG compliant encoder to a video source that provides video images;
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2. A method of detecting an abandoned object in a video image comprising the steps of:
- connecting an MPEG compliant encoder to a video source that provides video images;
storing a reference video frame;
obtaining the current video image frame;
determining the motion compensation for the current video image frame versus the reference video frame;
comparing the motion compensation to a threshold value;
compressing the current video image; and
storing an indication in the compressed video image that an abandoned object has been detected if the motion compensation is greater than the threshold value. - View Dependent Claims (3)
- connecting an MPEG compliant encoder to a video source that provides video images;
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4. A method of detecting the removal of an object in a video image comprising the steps of:
- connecting an MPEG compliant encoder to a video source that provides video images;
storing a reference video frame containing an object to be monitored;
defining a zone of interest around the object to be monitored;
obtaining the current video image frame;
determining the motion compensation for the current video image frame in the zone of interest versus the reference video frame zone of interest;
comparing the motion compensation to a threshold value;
compressing the current video image; and
storing an indication in the compressed video image that the removal of the object to be monitored has been detected if the motion compensation is greater than the threshold value. - View Dependent Claims (5)
- connecting an MPEG compliant encoder to a video source that provides video images;
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6. An apparatus for detecting motion in a video image comprising:
- an encoder adapted to be connected to a video image source, said encoder providing compressed video images including an MPEG compliant motion compensation between two video images; and
a comparator connected to said encoder for comparing the motion compensation with a predetermined threshold to determine if the motion compensation is greater than said predetermined threshold, said comparator providing an indication if the motion compensation is greater than said predetermined threshold. - View Dependent Claims (7, 12, 13, 14)
- an encoder adapted to be connected to a video image source, said encoder providing compressed video images including an MPEG compliant motion compensation between two video images; and
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8. An apparatus for detecting an abandoned object in a video image comprising:
- an encoder adapted to be connected to a video image source, said encoder providing compressed video images including an MPEG compliant motion compensation between two video images and comprising a first memory for storing the current video image frame and a processor;
a second memory for storing a reference video image;
said processor determining the motion compensation for the current video image stored in said first memory with the reference video image stored in said second memory, comparing said motion compensation with a threshold value, and providing an indication in the compressed image for the current frame that an abandoned object has been detected if the motion compensation is greater than the threshold value. - View Dependent Claims (9, 15, 16)
- an encoder adapted to be connected to a video image source, said encoder providing compressed video images including an MPEG compliant motion compensation between two video images and comprising a first memory for storing the current video image frame and a processor;
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10. An apparatus for detecting the removal of an object in a video image comprising:
- an encoder adapted to be connected to a video image source, said encoder providing compressed video images including an MPEG compliant motion compensation between two video images and comprising a first memory for storing the current video image frame and a processor;
a second memory for storing a reference video image containing an object to be monitored;
said processor being adapted to allow a zone of interest to be defined around the object in the reference image and determining the motion compensation for the zone of interest in the current video image stored in said first memory with the zone of interest in the reference video image stored in said second memory, comparing said motion compensation with a threshold value, and providing an indication in the compressed image for the current frame that the removal of the object has been detected if the motion compensation is greater than the threshold value. - View Dependent Claims (11, 17, 18)
- an encoder adapted to be connected to a video image source, said encoder providing compressed video images including an MPEG compliant motion compensation between two video images and comprising a first memory for storing the current video image frame and a processor;
Specification