Methods for detecting alteration of audio and images
First Claim
1. A method of detecting alteration of a complete data object, the data object comprising image or audio data, the method comprising—
- in order;
providing the object with supplemental data, the supplemental data being below a threshold of human perception when represented in the data object;
distributing the data object with the supplemental data;
acquiring a complete suspect data object;
discerning, by reference to any supplemental data in the suspect data object, an alteration of the suspect object.
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Accused Products
Abstract
The adage “photos don'"'"'t lie” is no longer reliable. The advent of digital editing tools makes it relatively easy to move, add, or delete features from photographs. Other digital content is similarly susceptible to alteration. This problem is at least partially overcome by providing a photograph with supplemental data. This supplemental data is below a threshold of human perception (e.g., is essentially invisible) yet can extend throughout the image. If a version of the image is thereafter encountered with the supplemental data missing or attenuated, the image is known to have been altered. By reference to such supplemental data, it is often possible to identify particular regions within the image that have been altered.
254 Citations
19 Claims
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1. A method of detecting alteration of a complete data object, the data object comprising image or audio data, the method comprising—
- in order;
providing the object with supplemental data, the supplemental data being below a threshold of human perception when represented in the data object;
distributing the data object with the supplemental data;
acquiring a complete suspect data object;
discerning, by reference to any supplemental data in the suspect data object, an alteration of the suspect object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- in order;
- 10. A method of determining alteration of an image, characterized by sensing an auxiliary signal at different regions of the image, said auxiliary signal not being apparent to a human observer of the image, and, by reference to the signal so-sensed, identifying at least one region as having been altered.
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15. A method of detecting alteration of a data object, the data object comprising image or audio data, the method comprising—
- in order;
providing an original data object with supplemental data, the supplemental data being below a threshold of human perception when represented in the original data object;
distributing the data object with the supplemental data;
acquiring a suspect data object; and
discerning, by reference to any supplemental data in the suspect data object, alteration within the suspect data object as compared to the original object. - View Dependent Claims (16, 17, 18, 19)
- in order;
Specification