MULTIPLE WATERMARKS FOR FIDELITY ASSESSMENT
First Claim
1. A method of assessing the perceptual quality of multimedia content provided over a communications channel, comprising the steps of:
- incorporating a plurality of digital watermarks in the multimedia content;
transmitting the multimedia content including the plurality of digital watermarks over the communications channel, each of the plurality of digital watermarks having an associated level of robustness with respect to at least one specified type of potential degradation of the respective digital watermark;
detecting at least one of the plurality of digital watermarks in the multimedia content; and
in response to having detected at least one of the plurality of digital watermarks in the multimedia content, generating an output indicative of at least the quality of the multimedia content based at least in part on the level of robustness of the at least one detected digital watermark.
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Abstract
A system and method of perceptual quality assessment for multimedia content in a communications network employing digital watermarking. A content preparer prepares content for quality assessment by embedding digital watermarks into the multimedia data, each watermark having a different level of robustness with respect to a specified type of potential degradation introduced during content transmission. A quality assessor provides an assessment of the quality of the transmitted content by attempting to detect the presence of at least one watermark, and calculating a quality assessment score based on the level(s) of robustness of the detected watermark(s) with respect to the specified type of potential degradation. The quality assessment score can be calculated based on the level of robustness of the least robust watermark whose presence was successfully detected by the quality assessor. The quality assessor generates an output indication of the transmitted content fidelity using any suitable type of output indication.
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Citations
26 Claims
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1. A method of assessing the perceptual quality of multimedia content provided over a communications channel, comprising the steps of:
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incorporating a plurality of digital watermarks in the multimedia content; transmitting the multimedia content including the plurality of digital watermarks over the communications channel, each of the plurality of digital watermarks having an associated level of robustness with respect to at least one specified type of potential degradation of the respective digital watermark; detecting at least one of the plurality of digital watermarks in the multimedia content; and in response to having detected at least one of the plurality of digital watermarks in the multimedia content, generating an output indicative of at least the quality of the multimedia content based at least in part on the level of robustness of the at least one detected digital watermark. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for assessing the perceptual quality of multimedia content provided over a communications channel, comprising:
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a multimedia content preparer including at least one digital watermark embedder, the at least one digital watermark embedder being operative to incorporate a plurality of digital watermarks in the multimedia content, each of the plurality of digital watermarks having an associated level of robustness with respect to at least one specified type of potential degradation of the respective digital watermark during transmission of the multimedia content over the communications channel; and a multimedia content quality assessor including at least one digital watermark detector and a multimedia quality assessment module, the at least one digital watermark detector being operative to detect at least one of the plurality of digital watermarks in the multimedia content, and the multimedia quality assessment module being operative, in response to the at least one digital watermark detector having detected at least one of the plurality of digital watermarks in the multimedia content, to generate an output indicative of at least the quality of the multimedia content based at least in part on the level of robustness of the at least one detected digital watermark. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification