公开(公告)号：US20180004424A1

公开(公告)日：2018-01-04

申请号：US15709534

申请日：2017-09-20

Applicant: FUJIFILM Corporation

Inventor： Kentaro MIYAMOTO

IPC: G06F3/06

CPC classification number: G06F3/065 ,  G06F3/0619 ,  G06F3/0643 ,  G06F3/067 ,  G06F12/00 ,  G06F19/00 ,  G06F21/6218 ,  G09C1/00 ,  G09C5/00 ,  H04L9/085

Abstract: Provided are an image file distribution apparatus, an image file recovery apparatus, an image file distribution method, an image file recovery method, an image file distribution program, an image file recovery program, and a recording medium storing the program which can prevent a relatively large increase in the amount of data of an image file even when an (k, n) secret sharing scheme with high security is used. For example, distributed tag information is obtained from tag information of the image file by a (k, n)-threshold secret sharing scheme. For example, distributed image data is obtained from image data by a (k, L, n)-threshold ramp secret sharing scheme. For example, the distributed tag information and the distributed image data are combined to obtain combined data. Since the amount of data in the tag information is small, the use of the (k, n) secret sharing scheme does not cause a large increase in the amount of data. Since the (k, L, n)-threshold ramp secret sharing scheme does not cause a large increase in the amount of data, an increase in the total amount of data in the image data is relatively small.

公开(公告)号：US20210366509A1

公开(公告)日：2021-11-25

申请号：US17393415

申请日：2021-08-04

Applicant: FUJIFILM CORPORATION

Inventor： Eiki OZAWA ,  Michitaka KONDO ,  Kentaro MIYAMOTO ,  Naoki SANO

IPC: G11B5/008 ,  G11B5/708 ,  G11B5/78

Abstract: An information processing device includes a recording unit that records a plurality of objects including data and metadata related to the data on a magnetic recording medium, and executes, after recording at least one of the objects, processing of recording first set data which is a set of the metadata included in the object. The first set data is the set of the metadata included in the object recorded after recording the first set data that is recorded immediately before. The magnetic recording medium has a magnetic layer containing a ferromagnetic powder and a binding agent on a non-magnetic support. A difference between spacings S0.5 and S13.5 measured under pressures of 0.5 atm and 13.5 atm by an optical interference method after n-hexane cleaning on a surface of the magnetic layer is equal to or less than 3.0 nm.

公开(公告)号：US20210210120A1

公开(公告)日：2021-07-08

申请号：US17210507

申请日：2021-03-24

Applicant: FUJIFILM CORPORATION

Inventor： Kentaro MIYAMOTO

IPC: G11B27/10 ,  G16H10/60 ,  G16H30/00 ,  G11B20/10 ,  G06F3/06

Abstract: A recording device that generates a hierarchy of groups for classifying each of a plurality of data to be recorded from information on each of the data, and performs a control of recording, for each group of a highest hierarchy, the plurality of data included in the group of the highest hierarchy on a recording medium in a recording order corresponding to an order from the top to the bottom of the hierarchy.

公开(公告)号：US20210383826A1

公开(公告)日：2021-12-09

申请号：US17393404

申请日：2021-08-04

Applicant: FUJIFILM CORPORATION

Inventor： Eiki OZAWA ,  Michitaka KONDO ,  Kentaro MIYAMOTO ,  Naoki SANO

IPC: G11B5/008 ,  G11B5/708 ,  G11B5/71 ,  G11B5/735 ,  G11B5/78

Abstract: An information processing device includes a generation unit that generates a hierarchy of a group that classifies each piece of data from information about each of a plurality of pieces of data to be recorded, and a control unit that controls recording of the plurality of pieces of data included in a group of the hierarchy at a highest level on a magnetic recording medium in a recording order according to an order from an upper hierarchy to a lower hierarchy, for each group of the hierarchy at the highest level. The magnetic recording medium has a magnetic layer containing a ferromagnetic powder and a binding agent on a non-magnetic support. A difference between spacings S0.5 and S13.5 measured under pressures of 0.5 atm and 13.5 atm by an optical interference method after n-hexane cleaning on a surface of the magnetic layer is equal to or less than 3.0 nm.

公开(公告)号：US20210005221A1

公开(公告)日：2021-01-07

申请号：US17022110

申请日：2020-09-16

Applicant: FUJIFILM CORPORATION

Inventor： Kentaro MIYAMOTO ,  Takashi MIYAMOTO ,  Michitaka KONDO

IPC: G11B20/10 ,  G11B5/008

Abstract: A recording device includes: a recording unit that records plural objects including data and metadata related to the data on a portable recording medium, and executes a process of recording first set data, which is a set of the metadata included in the object, at every predetermined timing after recording at least one of the objects, wherein each piece of the first set data is a set of the metadata included in the object recorded after recording of immediately preceding recorded first set data.