Human perceptual model applied to rendering of watermarked signals
First Claim
Patent Images
1. A method of digitally watermarking visual media comprising:
- passing a reference image and a watermarked image through a model of an output device;
passing the output of the model of the output device to a visual quality metric; and
using the output of the quality metric to adjust watermark embedding to achieve a desired visual quality in a watermarked image.
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Abstract
A digital watermarking system uses a model of a rendering device to take into account the impact of the rendering device on visual or auditory quality of the watermarked signal. For visual content, a reference image and watermarked image are passed through the model and then supplied to a visual quality metric that assesses the visibility of the watermark. The digital watermark embedding is adjusted iteratively with each pass through this process to produce a watermarked signal that has the desired visual quality.
48 Citations
16 Claims
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1. A method of digitally watermarking visual media comprising:
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passing a reference image and a watermarked image through a model of an output device;
passing the output of the model of the output device to a visual quality metric; and
using the output of the quality metric to adjust watermark embedding to achieve a desired visual quality in a watermarked image. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A storage medium on which is stored instructions for performing a method of digitally watermarking visual media, the method comprising:
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passing a reference image and a watermarked image through a model of an output device;
passing the output of the model of the output device to a visual quality metric; and
using the output of the quality metric to adjust watermark embedding to achieve a desired visual quality in a watermarked image.
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8. A method of digitally watermarking a signal comprising:
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passing a reference signal and a watermarked signal through a model of an output device;
passing the output of the model of the output device to a perceptual quality metric; and
using the output of the quality metric to adjust watermark embedding to achieve a desired perceptual quality in a watermarked signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A storage medium on which is stored instructions for performing a method of digitally watermarking a signal, the method comprising:
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passing a reference signal and a watermarked signal through a model of an output device;
passing the output of the model of the output device to a perceptual quality metric; and
using the output of the quality metric to adjust watermark embedding to achieve a desired perceptual quality in a watermarked signal.
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Specification