摘要:
The present invention relates generally to digital watermarking holographic structures. One method recites: creating a computer model; executing a transform domain iterative method to convert the computer model into a holographic structure; combining a digital watermark with the holographic structure; and conveying the combined digital watermark and holographic structure to a surface. Other combinations are provided and claimed as well.
摘要:
Methods for integrating digital watermarks into holograms, watermarked hologram structures, and related applications. One method creates a watermark image, and then embeds the watermark image into a holographic structure. The holographic structure is created using computer generated holography to create a digital representation of the holographic structure. This digital representation is recorded on a physical substrate using optical techniques or microlithography. As an alterative, a watermark signal is embedded in a physical holographic structure by embedding the signal into an image that is optically merged with the holographic structure as it is optically recorded, or by embedding the signal into an image or physical model from which the holographic structure is formed. Another approach the creates a halftone watermarked image, and forms the halftone watermarked image in the hologram by creating hologram dots corresponding to the dots in the halftone watermarked image.
摘要:
The present invention relates to digital watermarks integrated into holograms, watermarked hologram structures, and related applications as an authentication technique. One method creates a watermark image, and then embeds the watermark image into a holographic structure. The holographic structure is carried by a smart card. The smart card includes additional information. In one embodiment, the digital watermark includes information bits, and these information bits are used to authenticate the hologram, or the smart card. In another embodiment, the watermark's information bits are compared with the additional information carried by the smart card. The result of the comparison is used to authenticate the smart card or the hologram.
摘要:
Driver's licenses and other security documents include one or more machine-readable features, each conveying plural bits of information. These features are used in a variety of ways to increase security, and/or to enhance functionality. In one embodiment, data encoded on a driver's license is used at airport check-in, to link to a state DMV database and obtain information by which the document, and its custodian, can be authenticated. In like fashion, a license can be used to authenticate a bearer and/or his/her age prior to the sale of alcohol or tobacco products. In other embodiments, different elements of a driver's license (e.g., the substrate, photo, text data, and machine-readable data) are logically bound together (e.g., interlinked through payloads conveyed by different machine-readable features) as a deterrent against counterfeiting. Driver's licenses can be similarly logically bound to personal checks and other documents. Many other arrangements are also disclosed.
摘要:
The present invention relates to digital watermarks integrated into holograms, watermarked hologram structures, and related applications as an authentication technique. One method creates a watermark image, and then embeds the watermark image into a holographic structure. The holographic structure is carried by a smart card. The smart card includes additional information. In one embodiment, the digital watermark includes information bits, and these information bits are used to authenticate the hologram, or the smart card. In another embodiment, the watermark's information bits are compared with the additional information carried by the smart card. The result of the comparison is used to authenticate the smart card or the hologram.
摘要:
The disclosure describes an authentication system and related methods for authenticating printed objects. The system uses an information-based metric along with one or more print quality metrics to provide accurate detection or classification of a counterfeit printed object. The print quality metric evaluates attributes of a subject image associated with the original printer, ink or paper to detect degradation of those operations due to copying operations like an image scanning and halftone printing subsequent to the original printing of the object. The information-based metric measures message symbol errors in an optically readable code, such as a digital watermark.
摘要:
A watermark embedder transforms a media signal from its perceptual domain to frequency domain regions and embeds a hash of data from one frequency domain region into a watermark in another frequency domain region. Alternatively, it encodes instances of the same message into the frequency domain regions. To detect alteration of the media signal, a watermark decoder transforms a suspect signal into the frequency domain regions, extracts the watermark message from a first frequency domain region and compares it with a reference derived from another frequency domain region. The reference signal is either a hash computed from the other frequency domain region of the watermarked signal, or another instance of the same message embedded into the other frequency domain region. The decoder can be used to detect alteration of the signal, such as alteration that occurs with reproduction (printing, scanning, copying, D/A-A/D conversion, etc.), compression, cropping or swapping of media signal content, etc.
摘要:
The disclosure describes pattern recognition detectors and software used to detect patterns in image streams. The detectors operate on streams of image data, making them suitable for detecting certain types of patterns in documents and images passed between processes and devices. For instance, the streaming mode detectors operate in printer drivers on streams of image data being passed to a printer. Also, the streaming mode detectors operate in scanner drivers on streams of image data being passed from a scanner. The disclosure describes pattern detectors for shapes with complex features as well as objects comprised of many smaller shapes. The disclosure also describes novel raster line and edge tracing pattern techniques.
摘要:
The disclosure describes pattern recognition detectors and software used to detect objects in image streams. The detectors operate on streams of image data, making them suitable for detecting certain types of objects in documents and images passed between processes and devices. For instance, the streaming mode detectors operate in printer drivers on streams of image data being passed to a printer. Also, the streaming mode detectors operate in scanner drivers on streams of image data being passed from a scanner. The disclosure describes pattern detectors for shapes with complex features as well as objects comprised of many smaller shapes. The disclosure also describes novel raster line and edge tracing pattern techniques.
摘要:
An integrated read/write head assembly incorporates a thin film inductive write head subassembly comprising first and second pole pieces that define a write transducing gap, and a magnetoresistive read subassembly disposed in the write gap. The first write pole piece is extended so as to provide a planar conductive path from the terminal connections or studs to the magnetoresistive read subassembly, thereby forming a uniform surface for deposition of the magnetoresistive read subassembly.