Modifying video signals by converting non-intra pictures

A technology of intra-frame images and video segments, applied in the field of video recording systems, can solve the problems of image quality degradation and unacceptability

Inactive Publication Date: 2004-09-08
INTERDIGITAL CE PATENT HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the reduction in picture quality that is acceptable during normal playback may become unacceptable during trick mode operation

Method used

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  • Modifying video signals by converting non-intra pictures
  • Modifying video signals by converting non-intra pictures
  • Modifying video signals by converting non-intra pictures

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Embodiment Construction

[0011] figure 1 A system or storage media device 10 for implementing various advanced operating features in accordance with aspects of the present invention is shown in block diagram form. However, the present invention is not limited to figure 1 The specific device is shown, as the invention may be practiced with any other storage media device capable of receiving digitally encoded signals. Additionally, device 10 is not limited to reading data from or writing data to any particular type of storage medium, as any storage medium capable of storing digitally encoded data may be used for device 10 .

[0012] Device 10 may include a controller 24 for reading data from and writing data to a storage medium 26 . Device 10 may also include a controlling central processing unit (CPU) 14 . Control and data interfaces may also be provided to allow controlling CPU 14 to control the operation of encoder 20 , decoder 18 , search engine 16 and controller 24 . Appropriate software or fir...

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Abstract

The invention concerns a method ( 200 ) and system ( 10 ) for recording onto a storage medium ( 26 ) a video segment. The method includes the steps of: receiving the video segment ( 210 ) in which the video segment contains at least one predictive picture; and selectively converting the at least one predictive picture into an intra picture thereby replacing the at least one predictive picture with the intra picture. In one arrangement, the video segment can contain at least one introductory predictive picture, and the converting step can further include selectively decoding a predetermined number of the introductory predictive pictures to obtain a properly decoded predictive picture ( 212 ). Additionally, the video segment can contain at least one subsequent predictive picture and the converting step can further include selectively decoding the subsequent predictive pictures ( 214 ) and selectively re-encoding into intra pictures the subsequent predictive pictures, the introductory predictive pictures or a combination thereof ( 216 ).

Description

technical field [0001] The present invention relates generally to video recording systems, and more particularly to video recording systems for recording digitally encoded video sequences on disk media such as recordable digital video disks, hard disk drives, and magneto-optical disks. Background technique [0002] MPEG video generally uses three picture coding methods: intra (I) pictures, predictive (P) pictures and bidirectional predictive (B) pictures. I pictures are encoded and decoded independently of any other pictures. This establishes a reference picture from which P and B pictures or non-I pictures can be constructed. [0003] However, many MPEG video signals are encoded without using I pictures. In particular, many US cable system broadcasts use MPEG signals that do not include I pictures. At first glance, such a video signal may appear impossible to decode because there are no I pictures from which P and B pictures can be constructed. [0004] Nevertheless, mo...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H04N5/76G06T9/00G11B27/00G11B27/034G11B27/036H04N5/781H04N5/783H04N5/85H04N5/92H04N7/32H04N9/804
CPCH04N5/85H04N5/783H04N5/781G06T9/004G11B2220/2562H04N9/8042G11B27/036G11B2220/216G11B2220/213G11B2220/218G11B2220/2525G11B27/034G11B27/005H04N5/92
Inventor唐纳德·H·威利斯
OwnerINTERDIGITAL CE PATENT HLDG