Patent EP0600690A2 successfully refreshed from Google Patents.
EP0600690A2
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EP
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Digital image recording
Assignee: Samsung Electronics Co Ltd
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Filing: 1993-11-29
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Granted: —
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Expires: 2013-11-29
Abstract
Abstract A method for recording images in a digital video cassette recorder, which utilizes high compressibility which is an advantage in an interframe coding method, regularly and repeatedly records low-frequency data 120 of an intraframe corresponding to the outline of a picture in a group of pictures (GOP) and provides a remaining data recording area 130 in an end area of each GOP to resolve a problem of data quantity fixation and in order to perform trick play operations. Further, the method may group sub-images of a picture regularly or irregularly and record the low-frequency data of all of the sub-images which belong to a same group in a low-frequency data recording area 120 of each sub-image, thereby to raise picture quality during trick play.
Inventors
- 👤 Ku-Man 4-106 Donga Apt. Park
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 01:49
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/926; H04N5/9261; H04N5/9264; H04N5/78; H04N5/782; H04N5/783
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
165 words
A method of recording images on tape in a digital video recorder in GOP units (groups of pictures) constituted by randomly combining an I-picture coded using only information of the corresponding picture itself, a B-picture coded using a motion-compensated prediction from a past and/or future reference picture and a P-picture coded using the motion-compensated prediction from the past reference picture, characterized in that low-frequency data of each sync block of the I-picture is recorded for a certain distance on each track for the I-picture, the B-picture and the P-picture, high-frequency data of each sync block of the I-picture is sequentially recorded on a non-recorded area of the tracks for the I-picture, data of the P-picture is sequentially recorded on the area which remains after low-frequency data of the I-picture is recorded on the tracks for the P-picture, and the data of the B-picture is sequentially recorded on the area which remains after low-frequency data of the I-picture is recorded on the tracks for the B-picture.
Claim 2
Dependent Claim
48 words
An image recording method according to claim 1, wherein said data is recorded in a data recording area of a predetermined size separately provided on a track in a picture's end recording area of each said GOP unit, for fixing the data quantity of each said GOP unit.
Claim 3
Dependent Claim
38 words
An image recording method according to claim 2, wherein said predetermined size is a tape recording area corresponding to the data storage size of an output buffer for controlling an output bit rate of compressed and coded data.
Claim 4
Independent Claim
123 words
A method of recording images in a digital video recorder in which a compressed digital video signal of each sub-image of a picture divided into a predetermined number of sub-images is divided into low-frequency data and high-frequency data, so that low-frequency data is recorded for a certain distance on tracks of a length of tape and high-frequency data is sequentially recorded on the remaining area of the tracks, characterized in that the predetermined number of sub-images is divided into a plurality of groups in accordance with a predetermined method and then the low-frequency data of all of the sub-images which belong to the same group is recorded together on the low-frequency data recording area 120 of each sub-image belonging to the same group.
Claim 5
Dependent Claim
38 words
A method according to claim 4, wherein, when dividing said predetermined number of sub-images into said plurality of groups, said sub-images evenly distributed over the whole picture are classified so as to be included in the same group.
Claim 6
Dependent Claim
67 words
A method according to claim 4. wherein, when dividing said predetermined number of sub-images into said plurality of groups, and when said predetermined number of sub-images are serially numbered from left to right and from top to bottom and each serial sub-image is divided by a divisor of a predetermined magnitude, the sub-image whose serially assigned number has the same remainder is classified into the same group.
Claim 7
Dependent Claim
19 words
A method according to claim 4, 5 or 6, wherein said low-frequency data comprises a direct current component only.
Claim 8
Dependent Claim
27 words
A method according to claim 4, 5 or 6, wherein said low-frequency data comprises a direct current component and low-frequency data portions of an alternating current component.
Claim 9
Dependent Claim
16 words
A digital video recorder adapted to perform a method according to any of the preceding claims.
Claim 10
Dependent Claim
20 words
A digital video recorder according to claim 9, utilising a recording medium which comprises a tape contained in a cassette.
References Cited (Backward Citations)
No citation records indexed.
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