Invalidity dossier
US 7003666
Apparatus and method for embedding information for tamper detection and detecting tamper and recording medium having program for carrying out the method recorded thereon
Current assignee: Sovereign Peak Ventures LLC
Added 9/23/2026, 3:44:04 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US 7003666 B1
Title: "Apparatus and method for embedding information for tamper detection and detecting tamper and recording medium having program for carrying out the method recorded thereon."
Inventors: Hisashi Inoue and Takashi Katsura. Original Assignee: Matsushita Electric Industrial Co., Ltd. Current Assignee (per listing): Sovereign Peak Ventures LLC (the source notes assignee listings may be inaccurate). Priority date: 1999-11-25. Filing date: 2000-11-21. Publication/grant date: 2006-02-21. Legal status: Expired – Lifetime, adjusted expiration 2023-01-02.
Purpose and Problem Addressed:
Digital images transmitted over networks may be tampered with by third parties without the recipient's knowledge. Conventional electronic authentication requires transmitting both an image and an encrypted digest, creating management burdens; a watermarking-based alternative described in the source embeds information only in high-frequency components, so monotonous (low-contrast) image regions may not receive evenly embedded information and tampering there may go undetected. The stated object is to embed information not only in high-frequency components but across the entire image, including relatively low-frequency transform coefficients, enabling detection of tampering and localization of the tampered position.
Plain-Language Scope (per the described aspects):
The patent describes an apparatus and method that hierarchically divide a digital image signal into frequency bands, then embed authentication data in transform coefficients of a band referred to as "MRR." Authentication data is generated from a pseudo-random number series using key data, and the key data is embedded in transform coefficients of "MRA." Embedding in relatively low-frequency components is said to make embedded data vary less under irreversible image processing than under intentional tampering, aiding distinction between the two. On detection, the image is divided into unit blocks of pixels; information embedded in MRR coefficients representing the same spatial region is read and compared for verification against the authentication data assumed embedded, allowing localization of tampering on a unit-block regional basis. Not knowing the frequency bands, coefficient reading order, and key data makes deciphering difficult. A recording medium bearing a program for the method is also claimed.
What the excerpt does not establish: It does not explain the abbreviations "MRR" or "MRA," specify the exact transform used, identify the prior-art document fully (given only as an IEEE Proceedings citation), or describe claim language in detail—the source text is only an excerpt.
Generated 10/1/2026, 9:51:24 PM
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Litigation summary
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Proceedings on file (0)
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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