Method and Apparatus For Video Compression of Stationary Scenes
First Claim
1. A method for compressing an image comprising:
- Receiving an image region from an input image;
Determining if the image region is classified as a Background Region;
For an image region characterized as a Background Region;
Calculating a reconstruction error for the image region;
Comparing the error to a threshold;
Continuing to classify the image region as a Background Region when the error is below the threshold;
Changing the classification of the image region when the error is above the threshold.
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Abstract
The present system provides a method and apparatus for video compression of stationary scenes. These scenes may be taken by a fixed or temporarily fixed camera, such as, for example, a security camera. In theory, a stationary scene has a static background upon which objects move. However, due to environmental conditions, such as sun position, lighting changes, wind and weather, clouds, fog, and the like, the background is not consistently static. The system provides a dynamic and adaptive Scene Model to allow the subtraction of the static portions of a scene under a plurality of conditions, providing the bandwidth and storage capacity to record moving objects with higher fidelity at lower storage cost than prior art systems. In an alternate embodiment, the system uses Perceptual Filtering as a preliminary step to coding, significantly reducing the amount of data to be compressed at high fidelity.
16 Citations
18 Claims
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1. A method for compressing an image comprising:
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Receiving an image region from an input image; Determining if the image region is classified as a Background Region; For an image region characterized as a Background Region; Calculating a reconstruction error for the image region; Comparing the error to a threshold; Continuing to classify the image region as a Background Region when the error is below the threshold; Changing the classification of the image region when the error is above the threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of compressing an image comprising:
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Receiving an image region from an input image; Comparing the image region to a reference image to identify a difference value; Setting a change mask to a first value when the difference value is below a threshold value; Setting the change mask to a second value when the difference value is above a threshold value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification