Information recording media, information reproduction apparatus, and information reproducing method
AssigneeHitachi-LG Data Storage, Inc.
InventorsTakao Watanabe, Daisuke Tomita, Koichi Watanabe, Ryo Imai
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Abstract
A motion picture is captured while a focal position is changed in a predetermined reproduction layer of a recording medium, the resolutions of a plurality of still images acquired by the capturing of the motion picture are checked using check patterns, which are recorded at a predetermined frequency, of the medium, it is determined whether the still images are usable for the reproduction of data, and a plurality of the still images determined to be usable are composed.
Claims18
An information recording medium, in which recording dots of minute structural changed areas having a refractive index different from the periphery are formed inside in the shape of a layer, that is transparent for reproduction light,
- wherein a data area used for recording information and a resolution check pattern area used for checking the resolution of an image are included in the layer, and
- wherein the resolution check pattern is configured by a set of dots,
- and there are two or more spatial frequencies within the arrangement of the dots, each spatial frequency defining a spacing between adjacent dots in the set of dots.
An information reproduction apparatus that reproduces data recorded on a recording medium in which recording dots of minute structural changed areas having a refractive index different from the periphery are formed inside in the shape of a layer, the information reproduction apparatus comprising:
- a capturing unit that captures a motion picture while changing a focal position in a predetermined reproduction layer;
- a unit that reproduces a plurality of still images from the motion picture and determines whether the still images are usable for reproduction of data based on resolutions of resolution check patterns each configured by dots disposed in the recording medium;
- a unit that composes a plurality of the still images determined to be usable;
- a first buffer memory that stores an image captured from the motion picture;
- and
- a second buffer memory that is used for performing reproduction signal processing of the still images.
An information reproducing method for reproducing data recorded on a recording medium in which recording dots of minute structural changed areas having a refractive index different from the periphery are formed inside in the shape of a layer, the information reproducing method comprising:
- capturing a motion picture while changing a focal position in a predetermined reproduction layer;
- reproducing a plurality of still images of a same region from the motion picture;
- extracting still images that are usable for reproduction of data based on resolutions of resolution check patterns each configured by dots disposed in the recording medium from the plurality of still images;
- composing a plurality of the extracted still images;
- and
- outputting the composed image,
- wherein, in the composing of a plurality of the extracted still images, a darkest pixel located at a same XY position in the plurality of the still images is selected, and the selected pixels are composed.
An information reproducing method for reproducing data recorded on a recording medium in which recording dots of minute structural changed areas having a refractive index different from the periphery are formed inside in the shape of a layer, the information reproducing method comprising:
- capturing a motion picture while changing a focal position in a predetermined reproduction layer;
- reproducing a plurality of still images of a same region from the motion picture;
- extracting still images that are usable for reproduction of data based on resolutions of resolution check patterns each configured by dots disposed in the recording medium from the plurality of still images;
- composing a plurality of the extracted still images;
- and
- outputting the composed image,
- wherein, the step of composing of a plurality of the extracted still images is performed using an average of pixels, a minimum value, a maximum value, or a median value, after correcting a deviation and a rotation in the layer plane.
Dependencies are inferred from the claim text.