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US 7,742,619 B2Granted
Image watermarking based on sequency and wavelet transforms
AssigneeTexas Instruments Incorporated
InventorsSanjeev Kumar, Raghuram Karthik Jayaraman
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AssigneeTexas Instruments Incorporated
InventorsSanjeev Kumar, Raghuram Karthik Jayaraman
Estimating the term…
This invention is a new approach for the image watermarking in the wavelet transform domain based on sequency of the host and watermark image. For each sub-band a first transform level of the host image is thresholded and binarized. Sequencies of thresholded and binarized data host image are compared with sequencies of the discrete wavelet transformed watermark image to form a watermarking sequency mask. The watermarked wavelet domain data is formed by combining data elements of the discrete wavelet transformed host image with corresponding data elements of the wavelet transformed watermark image as filtered by the watermarking mask. A reverse process can extract the watermark with a high degree of accuracy even after attack upon the watermarked host image.
A method for embedding a binary watermark image into a gray scale host image comprising the steps of:
The method of extracting a watermark from a watermarked host image comprising the steps of:
Dependencies are inferred from the claim text.