Matsushita Electric Industrial Co., Ltd.

Yoshito Aoki

Takashi Ishida

Shunji Ohara

Shigeru Furumiya

Toyoji Gushima

Yoshinari Takemura

Yuichi Kamioka

Yuji Hisakado

Mamoru Shoji

Isao Satoh

Yuji Takagi

Takahiro Nagai

Shinichi Konishi

Hironori Deguchi

Yoshiyuki Miyabata

Takeo Azuma

Kenji Kondo

Naoyasu Miyagawa

Kenya Uomori

A plurality of iris images of a person to be authenticated in which the positions of extraneous light reflection are respectively different are captured by using an image capturing device. Iris codes, that is, features for authentication, are respectively extracted from the plural iris images, and the plural iris codes thus extracted are respectively compared with a registered iris code, so as to generate a plurality of comparison results. The plural comparison results are integrated to obtain an ultimate comparison score, which is used for the authentication.

Personal authentication method, personal authentication apparatus and image capturing device

First modification detection data is generated from the (compressed) video data. The video data is combined with the first modification detection data. The combined data is recorded on a recording medium. The read combined data is separated into the compressed video data and the first modification detection data. Second modification detection data is generated according to the separated compressed data. The separated first data modification detection data is compared with the second data modification detection data to detect data modification. Outputting expanded video data is controlled according to the comparing result. The recorded data may be copied on a removable disc. A data reproducing apparatus having the second modification detection data generation circuit and the comparing circuit reproduces the removable disc. The reproduced video data may be further processed by a watermark processing circuit to embed watermark data in the video data which are recorded on another removable disc. The compressed video data may be transmitted through a network with encrypting. Encrypting key data is exchanged between the data transmitting side and the receiving side for decrypting. Encrypted video data may be recorded or transmitted and the encrypting key is stored for decrypting or transmitted for decrypting.

Video data recording and reproducing apparatus, a video data reproducing apparatus, and a method of recording and reproducing video data with data modification detection

Information is recorded on and reproduced from a disk ECC-block by ECC-block. Every ECC block is composed of plural sectors. A recording command is generated which contains information of a recording position on the disk. The information of the recording position is stored into a nonvolatile memory. Data is recorded on the disk in response to the recording command. In cases where power supply is turned on after interruption of power supply terminates, a specified ECC block is detected from the information stored in the nonvolatile memory. The specified ECC block is adversely affected by the interruption of power supply during the recording of data on the disk. One of a reproducing command and a verify command is generated for at least one sector of the specified ECC block. Data is reproduced from the specified ECC block on the disk in response to the one of the reproducing command and the verify command. A decision is made as to whether or not the reproduction of data from the specified ECC block succeeds or fails. In cases where it is decided that the reproduction of data from the specified ECC block fails, data is recorded on a whole of the specified ECC block to convert the specified ECC block into a normal ECC block.

Method and apparatus for recording and reproducing information on and from disk

Address groups are composed of two of address blocks , and , where the address blocks , and are disposed in a sector address region and include identifiable information of address numbers and overlapping sequential numbers . The address groups are disposed so that each group is alternately shifted from a track center toward the inner periphery side or the outer periphery side, by a width substantially equal to half the track pitch, along the radius direction.

Optical disk and a recording/reproduction apparatus using multiple address block groups shifted oppositely with multiple address blocks and non-pit data

Optical disk and a recording/reproduction apparatus using multiple address block groups shifted oppositely with multiple address blocks having clock synchronization, address number and address ID

Optical disk and a recording/reproduction apparatus using multiple address block groups shifted oppositely with multiple address blocks and clock synchronization

Optical disk and a recording/reproduction apparatus thereof

Address groups are composed of two of address blocks,, and,, where the address blocks,, and,are disposed in a sector address region,and include identifiable information of address numbers,and overlapping sequential numbers,. The address groups are disposed so that each group is alternately shifted from a track center,toward the inner periphery side or the outer periphery side, by a width substantially equal to half the track pitch, along the radius direction.

Optical disk and recording/reproducing apparatus using multiple address block groups shifted oppositely with multiple address blocks

A two-layer optical disk has a first layer of a disk shaped recording medium for storing data and a second layer of a disk shaped recording medium placed over the first layer for storing data. Data blocks A, B, C are stored in the first layer in said order. Similarly, data blocks X, Y, Z are stored in the second layer in said order. When reading the data from the two-layer optical disk, the data blocks are read in the order of A, X, B, Y, C, Z.

Two-layer optical disk

An optical disk according to the present invention includes a first track having a spiral shape and a second track having a spiral shape, the first track and the second track adjoining each other, and information being recorded on or reproduced from the first track and the second track. The optical disk further includes an address region including: a first address block formed so as to be on both the first track and the second track adjoining the first track on an inner periphery side; and a second address block formed so as to be on both the first track and the second track adjoining the first track on an outer periphery side.

Optical disk and an optical disk recording/reproduction device having

Optical disk and an optical disk recording reproduction device

A read-only zone or control zone is formed in an optical information recording medium wherein information signal are formed in both grooves and lands. Grooves are not formed in the control zone or read-only zone, and read-only data such as control data, audio-video data, or computer data is pre-recorded as a sequence of pre-formed pits on the track center line. The track pitch of the pre-formed pit sequences in the control zone or read-only zone is equal to the groove pitch in the read-write zones.

Optical information recording medium

An optical disk of the present invention has one or more recording tracks formed concentrically or spirally on the disk to which data signals are recorded by forming different-length marks and spaces on the tracks. An ID signal combining marks and spaces of two or more predetermined lengths approximately equal to the length of the marks and spaces forming the data signals is recorded to the recording tracks within a predetermined disk area, thus creating the ID signal by aligning the marks and spaces in the radial direction and recording the aligned marks and spaces to adjacent tracks in a predetermined radial disk area. Also, a reproduction apparatus for reproducing signals from the optical disk is disclosed.

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Moriguchi, Japan

Yoshito Aoki