초록 ▼

Methods and apparatus for enhancing the robustness of watermark extraction from digital host content are provided. Embedded watermarks may be extracted from received digital host content in accordance with a stego key. A first watermark is extracted and a number of errors in the first extracted wate

Methods and apparatus for enhancing the robustness of watermark extraction from digital host content are provided. Embedded watermarks may be extracted from received digital host content in accordance with a stego key. A first watermark is extracted and a number of errors in the first extracted watermark is assessed. If the number of errors is above a first pre-determined value, at least a second watermark is extracted from the host content. A number of errors in at least the second extracted watermark is assessed. If the number of errors in at least the second extracted watermark is above a second pre-determined value, the extraction results for the extracted watermarks are combined in order to cumulatively assess the validity of the first extracted watermark and at least the second extracted watermark.

대표청구항 ▼

What is claimed is: 1. A method for watermark extraction from digital host content, comprising:receiving a digital host content at a reception device; andextracting embedded watermarks from the host content, using an extraction device, the extracting comprising:decoding individual symbols of an embe

What is claimed is: 1. A method for watermark extraction from digital host content, comprising:receiving a digital host content at a reception device; andextracting embedded watermarks from the host content, using an extraction device, the extracting comprising:decoding individual symbols of an embedded watermark in accordance with at least one watermark detection algorithm, wherein the decoding produces a correlation value, within a range of correlation values, for each individual symbol;assigning a discrete symbol value to each decoded symbol;associating a likelihood measure with each decoded symbol in accordance with the corresponding correlation value; anddetermining whether or not the decoded symbols constitute a valid watermark in accordance with a cumulative assessment of the discrete symbol values and the likelihood measures.