Method and apparatus for modifying a video stream to encode metadata
First Claim
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1. A method of processing a video data stream to encode metadata, comprising:
- receiving in a video processor a sequence of video images, the pixel data of one video image having been modified to encode current metadata associated with that image and to encode other metadata for N other images respectively in the sequence of images, where N is equal to or greater than four;
testing for validity of the metadata encoded in an image;
if the metadata encoded in that image is valid, extracting in the video processor the metadata associated with that image and the other metadata for said N other images; and
associating said other metadata respectively with said N other images.
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Abstract
A watermark encoder receives a current video image together with current metadata associated with the current image. A metadata delay also makes available to the watermark decoder delayed metadata associated respectively with four or more of the preceding. Then the watermark encoder modifies pixel values of the current image not only to encode the current metadata but also the delayed metadata. At a decoder, if metadata for the current image is corrupted or missing, it can be recovered from one of the succeeding images.
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Citations
2 Claims
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1. A method of processing a video data stream to encode metadata, comprising:
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receiving in a video processor a sequence of video images, the pixel data of one video image having been modified to encode current metadata associated with that image and to encode other metadata for N other images respectively in the sequence of images, where N is equal to or greater than four; testing for validity of the metadata encoded in an image; if the metadata encoded in that image is valid, extracting in the video processor the metadata associated with that image and the other metadata for said N other images; and associating said other metadata respectively with said N other images. - View Dependent Claims (2)
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Specification