Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Hisashi Inoue

Takashi Katsura

Kenichi Noridomi

Masataka Ejima

Masaaki Kobayashi

Yoshihiro Morioka

Kenji Matsuura

Shinya Kadono Kadono

Kazuhiko Nakamura

Akihiro Takeuchi

Takanori Okada

Takeshi Hamasaki

Shiro Iwasaki

Shuichi Ojima

Yuji Shimizu

Yuichi Kawaguchi

Eiichi Hatae

Masakazu Mimura

Mikio Shimazu

Koji Arimura

Michifumi Inai

Shinichi Tsumori

Shugo Horikami

Takashi Kurama

Koji Sugishita

Akio Miyazaki

A content shooting apparatus is provided which is suitable for generating a digest meeting the user's desire. A scene information generation portion detects a characteristic scene with reference to a parameter contained in either video/audio in content recorded during shooting operation information for the shooting apparatus, and generates scene information, an auxiliary information assignment portion assigns the scene information its type, priority, start time, end time, or representative time as auxiliary information in accordance with a prescribed rule, a listing portion makes a list of the scene information and the auxiliary information thereof, and a scene sorting-out portion sorts out scenes from the content with reference to the priority, such that the number of scenes is within a predetermined range.

Content shooting apparatus

In a content shooting apparatus (Acc) for recording content data (Sav) containing video, audio, or data onto an information recording medium (), in combination with first metadata (Di, Dm) containing a parameter representing scene information (SI), and allowing access to a specific portion of the content (Sav) with reference to the scene information (SI), a camera microcomputer () detects movement of a camera () to generate the first metadata (Di, Dm) by comparing the detected movement with a predetermined value (Th), and also generates second meta data (Di, Dm) by filtering out the first metadata (Di, Dm) generated within a predetermined specific window period (W) via a predetermined function.

Content shooting apparatus for generating scene representation metadata

Even in the case where a positional misalignment occurs to an embedded digital watermark, watermark information is accurately detected. A digital watermark embedding device includes a block dividing section for dividing digital data into a plurality of blocks each having a predetermined size, and a block selecting section for selecting m blocks (m is an integer no less than 2) from the plurality of the blocks in accordance with a predetermined order. The device further includes an additional pattern setting section for setting a combination of m additional patterns which are selected from a plurality types of additional patterns, the combination corresponding to one data element to be embedded into the selected m blocks, and an additional pattern embedding section for embedding each of the set additional patterns into each of the selected blocks.

Device, method, and recording medium for embedding/detecting a digital watermark

Information embedding is performed by extracting vertices constituting a polygon from vector data, and changing a number of points that exist on sides of the polygon based on embedment information. Further, information reading is performed by extracting points existing on the sides of the polygon from the embedment information and embedded vector data, and by reading the embedment information according to a predetermined rule.

Information embedding device and program for changing a number of points that exist on sides of a polygon

An information-detecting apparatus () including a receiving unit () operable to receive digital data () that includes several pieces of element data, in which a change amount is imparted to a value of each of first and second element data among the several pieces of element data, a first selecting unit () operable to select, as target data (), a data set that includes the first and second element data, a second selecting unit () operable to select, as neighboring data (), element data in proximity to each of the first and second element data, a calculating unit () operable to calculate, based on both of the target data () and the neighboring data (), the change amount imparted to each of the first and second element data, and a detecting unit () operable to detect the additional information in accordance with the change amount.

Information-detecting apparatus and method

A bit stream is decoded to generate first quantized DCT-coefficients. The first quantized DCT-coefficients are inversely quantized using a first quantization table, thereby generating DCT-coefficients. The resulting DCT-coefficients are quantized using a second quantization table, thereby generating second quantized DCT-coefficients. Elements in the second quantization table are smaller in value than those in the first quantization table. Predetermined additional information is embedded into the second quantized DCT-coefficients. The second quantized DCT-coefficients having the additional information embedded therein are encoded to produce a bit stream having the additional information embedded therein. The second quantization table is set to be smaller in value than the first quantization table.

Image-processing apparatus and method

A digital image signal based on transformed in frequency, thereby providing partitioned frequency components. Characteristic information is calculated in accordance with a coefficient at a first frequency domain that is selected from among the partitioned frequency components. A coefficient at a second frequency domain is handled in accordance with predetermined rules, thereby embedding the characteristic information into the coefficient at the second frequency domain. The second frequency domain is selected from among areas that differ from the first frequency domain. The frequency coefficients that exhibit several frequency components are encoded in a predetermined manner, thereby producing compressed image data.

Information-embedding apparatus, encoder, tamper-detecting apparatus, information-embedding method, tamper-detecting method, and recording medium having program recorded therein for executing both of the methods

A digital image signal is divided into blocks. Each of the divided blocks is subjected to orthogonal transformation. As a result, the divided blocks are transformed into several frequency components. One or more frequency components are selected in accordance with a characteristic amount that is extracted from the several frequency components. Values of the selected frequency components are operated under a predetermined rule in accordance with an embedment signal that is generated from embedment information.

Digital watermark-embedding apparatus and method, digital watermark-detecting apparatus and method, and recording medium

A characteristic amount is retained and calculated from an entered video signal. Embedment intensity is retained and calculated from the retained characteristic amount. Embedment information is embedded as digital watermarks into the entered video signal in accordance with the retained embedment intensity of the previous frame or field that is located at a position earlier in time than a target image subject to digital watermark embedment. As a result, an output signal of video having the digital watermarks embedded therein is produced. The digital watermarks are embedded into the target image with reference to another image located at a position earlier in time than the target image. Such digital watermark embedment suppresses a delay in output of an output image with reference to an input image.

Digital watermark-embedding apparatus, digital watermark-embedding method, and recording medium

An input image is divided into local regions, each of which is formed by a macro block. An embedment intensity is determined for each of the local regions by using a calculated characteristic amount and a compression bit rate. Digital watermarks are embedded at the determined embedment intensity into the input image at each of the local regions thereof. The input image is encoded, thereby providing a compressed bit stream that has the digital watermarks embedded therein.

Digital watermark-embedding apparatus, digital watermark-embedding method, and recording medium having recoded therein a program for performing the digital watermark-embedding method

A reproduction equipment converts an identification code of the reproduction equipment into a plurality of signal sequences using a correspondence table and embeds the obtained plurality of signal sequences in AV signals as a digital watermark. A reproduction equipment specifying equipment compares correlation values of the AV signals, containing the digital watermark embedded therein with all signal sequences contained in a correspondence table. A comparison of the correlation values with a previously set threshold value determines the embedded signal sequences and the identification code of the reproduction equipment which may be extracted.

Reproduction equipment, reproduction equipment specifying equipment, reproduction equipment specifying system and methods and recording media for said equipment and system

A justification/authentication personal certificate system stores in a remote database a counterpart of an identifier and a digital watermark contained in the personal certificate. The personal certificate includes the digital watermark embedded in an authentic image such as a facial photograph, a retinal scan, or a fingerprint. When the personal certificate is used, the authentic image is read from the personal certificate, and the digital watermark information is extracted. The digital watermark information and the identifier are compared with the counterparts stored in the database. If the extracted digital watermark information is identical to the information in the database, then the personal certificate is judged to be unjustifiable. In one embodiment, at least one of the identifier and digital watermark are changed each time the system justifies the personal certificate.

Justification authenticating system, personal certificate issuing system, and personal certificate

An object of the present invention is to provide an information embedding/tamper detecting apparatus and method capable of distinguishing between changes caused by image processing and intentional image tampering, and further capable of localizing, on a regional basis, a tampered position on an image. A tamper-detection-information embedding apparatusdivides the image into a plurality of frequency bands to obtain transform coefficients, and then generates a pseudo-random number series by using key data, and further generates authentication data. The key data and the authentication data are embedded in the transform coefficients of MRA and MRR, respectively. the image in which the information is embedded is reconstructed by using MRA and MRR. A tamper-detecting apparatusextracts the key data from MRA obtained by dividing the image into frequency bands and generates the authentication data assumed to have been embedded, and further extracts the embedded information from MRR. The image is divided in to a plurality of blocks composed of a predetermined number of pixels. For each block, an information series embedded in the transform coefficients of MRR representing the same spatial region as the unit block is compared, for verification, with the corresponding authentication data series so that the tamper is determined on a regional basis.

Apparatus and method for embedding information for tamper detection and detecting tamper and recording medium having program for carrying out the method recorded thereon

Embedding data to be embedded as a digital watermark is acquired. Packing data is formed in which the embedding data is repeatedly connected three times or more sequentially without interval. Real embedding information is formed such that a redundancy bit with a fixed length that is used for an error correction of an information bit is added immediately after the information bit in which the packing data is subdivided into data each having a fixed length. The real embedding information is embedded into the image data itself. The embedding mechanism for the information is not easily understood, and security level is high.

Digital watermark embedding method, digital watermark extracting method, recording medium, image recording device, and image replaying device

In an embedding apparatus, a transform section divides an original image into a plurality of blocks to perform orthogonal transform every block. An embedding section embeds a pseudo-random number sequence mapped with inherent digital information in part of a transform coefficients sequence obtained by the orthogonal transform using a weight sequence. In an extracting apparatus, a calculation section reads transform coefficients sequences for respective blocks from the data including the pseudo-random number sequence embedded therein in a predetermined order, and calculates an inner product between the transform coefficients sequences and a pseudo-random number sequence. A determination section determines that the pseudo-random number sequence has been embedded when the inner product is greater than a predetermined threshold value. A generation section extracts inherent digital information mapped with the determined pseudo-random number sequence. This method discourages deciphering of the digital information, suppresses image quality deterioration, and improves the detection rate of watermark data.

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Fukuoka, Japan

Hisashi Inoue