Screen watermarking methods and arrangements
First Claim
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1. A method comprising the acts:
- determining a display scale for presentation of information on a display screen;
based on said determined display scale, establishing a scale parameter for use in generating a scale-dependent pattern that conveys a plural-bit payload;
using said established scale parameter in generating said scale-dependent pattern that conveys the plural-bit payload, said generating employing a hardware processor that is configured to perform said generating act; and
combining the scale-dependent pattern with said information, in a combined presentation on said display screen.
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Abstract
In an exemplary embodiment, image content is rendered to include a digital watermark pattern at an essentially fixed scale, regardless of the size of screen on which the content is displayed. In one particular embodiment, CSS and JavaScript are responsive to the rendering context (which can include screen size, and/or viewer position) to define the geometry of a watermarked texture block, which is tiled to serve as a background of an HTML-defined page. A great variety of other features and arrangements are also detailed.
33 Citations
13 Claims
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1. A method comprising the acts:
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determining a display scale for presentation of information on a display screen; based on said determined display scale, establishing a scale parameter for use in generating a scale-dependent pattern that conveys a plural-bit payload; using said established scale parameter in generating said scale-dependent pattern that conveys the plural-bit payload, said generating employing a hardware processor that is configured to perform said generating act; and combining the scale-dependent pattern with said information, in a combined presentation on said display screen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising the acts:
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detecting a scale change, when information presented to a user on a display screen is changed from a first scale to a second scale; and controlling a scale of a digital watermark pattern also presented on the display screen, so that an absolute value of the scale change of the digital watermark pattern is less than an absolute value of said scale change of the information presented to the user. - View Dependent Claims (10, 11, 12)
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13. An apparatus comprising:
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means for detecting a scale change, when information presented to a user on a display screen is changed from a first scale to a second scale; and means for controlling a scale of a digital watermark pattern also presented on the display screen, so that an absolute value of the scale change of the digital watermark pattern is less than an absolute value of said scale change of the information presented to the user.
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Specification