Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1999-12-06
2004-03-02
Tran, Thai (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C345S215000
Reexamination Certificate
active
06701064
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to multimedia presentations in which graphics objects are presented interactively over a video background.
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for playing back a record carrier on which are recorded at least a first stream of data representing a video item, a second stream of data representing a graphics item, and a control program for controlling interactive playback of said items, said apparatus comprising,
means for selecting a stream of data to be read from the record carrier, which means are controlled by the control program,
reading means for reading the control program and the selected stream from the record carrier,
video generating means for generating a pixel based representation of the video item in the first stream,
graphics generating means for generating a pixel based representation of the graphics item in the second stream, input means for receiving user input,
which apparatus is adapted for executing a first program portion of the control program which comprises at least primary data relating to shape properties of a graphics object, for executing a test for compliance of user input with a condition specified in the control program and for executing a second program portion of the control program for giving visual feedback in response to the user input,
The invention further relates to a method for playing back a record carrier, said method comprising the following steps,
reading a control program having a first and second program portion from the record carrier,
executing the first program portion comprising primary data relating to shape properties of a graphics object,
requesting user input,
performing a test comprised in said program for compliance of said user input with a condition,
upon compliance of the user input with said condition executing the second program portion for giving visual feedback to the user input,
selecting a stream of data representing a video item and/or a graphics item, the selection being dependent on the user input,
reading said stream from the record carrier and generating a pixel based representation from the item in said stream.
The invention further relates to a record carrier on which is recorded at least
a first stream of data representing a video item,
a second stream of data representing a graphics item,
a control program for controlling interactive playback of said items, which program has a first program portion which comprises primary data relating to shape properties of a graphics object and a second program portion which is to be executed after the first program portion in case of compliance of user input with a predetermined condition specified in the program, which second program portion specifies a visual feedback in response to the user input.
The invention also relates to a method of manufacturing a record carrier according to which method
a first stream of data representing a video item is stored at the record carrier,
a second stream of data representing a graphics item is stored at the record carrier,
a control program for controlling interactive playback of said items is stored at the record carrier, which program has a first program portion which comprises primary data, relating to shape properties of a graphics object and a second program portion which is to be executed after the first program portion in case of compliance of user input with a predetermined condition specified in the program, which second program portion specifies a visual feedback in response to the user input, characterised in that the second program portion comprises secondary data, relating to at least an additional visual property of the graphics object.
The SVCD standard as layed down in the working draft SC100B/NP177/PTD-003 specifies an apparatus for playback of play items, a play item being an audio, and/or a video and/or a graphics item. If so desired a graphics item can be reproduced synchronously with a video item, e.g. in the form of subtitling accompanying a video item. A pixel based representation is to be interpreted as a representation in the form of a two-dimensional array of picture elements. According to the SVCD standard the apparatus is to comprise means for controlling interactive playback of the items at the record carrier by means of a play back control program. This program comprises structures denoted as “play list” and “selection list”. The former structure specifies a sequence of play items to be played sequentially. The latter structure enables a user to choose which play items are to be reproduced and in which order. The selection list contains amongst others a reference to a play item. The latter is for example a graphics item which comprises a graphics object representing a menu having different menu parts which correspond to play items at the record carrier which are available to the user. The menu parts for example are in the form of a short description of the corresponding play item or a logo representing the available play item. The shape properties of a graphics object are defined as properties necessary to reconstruct the shape of the graphics object in the pixel based representation. In the SVCD standard the shape properties are defined in the structure “display data” in the form of runlength encoded data. The reference in the selection list is primary data relating to the shape properties in that it refers to the graphics item comprising the display data. The selection list in addition contains references to play items from which the user can make a choice (available play items) and assigns a rectangular region to each of the available play items. By pointing at a rectangular region, the user can focus on an available play item. That available play item can subsequently be activated by the user, for example by pushing a button. By focussing on or activating an available play item the menu part within the corresponding rectangular region is highlighted as a visual feedback upon the user input. Highlighting of the rectangular region is realised by means of a color lookup table. In the rectangular region corresponding to the play item which is focussed upon or activated the color lookup table is loaded with color values differing from those outside the rectangular region. This has the disadvantage that a menu part can only be highlighted individually if that menu part has a rectangular region which does not contain another menu part. This restricts the feedback capabilities of the known apparatus.
The above references are hereby incorporated herein in whole by reference.
SUMMARY OF THE INVENTION
It is a purpose of the invention to provide means which enable an improved feedback upon user input.
According to this purpose the apparatus is characterized in that, the second program portion of the control program comprises secondary data which relates to an additional visual property of the graphics object, the apparatus being adapted for generating the visual feedback by reproducing a pixel based representation of the graphics object on the basis of the primary data and the secondary data.
According to this purpose the method for playing back is characterised in that the second program portion comprises secondary data relating to at least one additional visual property of the graphics object and in that the visual feedback is a representation of the graphics object on the basis of the primary and the secondary data.
According to this purpose the record carrier of the invention is characterised in that the second program portion comprises secondary data, relating to at least an additional visual property of the graphics object.
According to this purpose the method for manufacturing a record carrier is characterised in that the second program portion comprises secondary data relating to at least an additional visual property of the graphics object. The measures of the invention enable an improved response to user input.
According to these measures execution of the second program portion of the control program has the effect that an ad
De Haan Wiebe
Suzuki Kazuhiro
Belk Michael E.
Koninklijke Philips Electronics , N.V.
Onuaku Christopher
Tran Thai
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