Decoding apparatus for encoded video signals

Abstract

The present invention is a decoding apparatus for decoding an encoded video signal capable of displaying a secondary video synchronously with a primary video. The decoding apparatus includes: an auxiliary information analyzing part that analyzes auxiliary information including display auxiliary information about a display position and/or a display size of the secondary video, and applied time information by which the display auxiliary information is applied; a reference time counter that indicates a reference time at which a video is decoded and displayed; a comparing part that compares the applied time information with the reference time counter; a display screen forming part that uses a primary video and a secondary video to form a display screen; and a control part that controls the display screen forming part, wherein the control part controls the display position and/or the display size of the secondary video by affording a command to the display screen forming part using the display auxiliary information, based on an output result of the comparing part.

1 . A decoding apparatus that decodes an encoded video signal capable of displaying a secondary video synchronously with a main image, comprising:
 an auxiliary information analyzing part that analyzes auxiliary information including display auxiliary information about a display position and/or a display size of the secondary video, and applied time information by which the display auxiliary information is applied;   a reference time counter that indicates a reference time at which a video is decoded and displayed;   a comparing part that compares the applied time information with the reference time counter;   a display screen forming part that uses a primary video and a secondary video to form a display screen; and   a control part that controls the display screen forming part,   wherein the control part controls the display position and/or the display size of the secondary video by affording a command to the display screen forming part using the display auxiliary information, based on an output result of the comparing part.   
   
   
       2 . A decoding apparatus that decodes an encoded video signal including a frame ID for uniquely identifying a frame in encoded information of the frame and decodes an encoded video signal capable of displaying a secondary video synchronously with a primary video, comprising:
 an auxiliary information analyzing part that analyzes auxiliary information including display auxiliary information about a display position and/or a display size of the secondary video, and applied frame ID information by which the display auxiliary information is applied;   a frame ID analyzing part that analyzes the frame ID of a frame included in the encoded video signal;   a comparing part that compares the applied frame ID information with the frame ID of the frame;   a display screen forming part that uses a primary video and a secondary video to form a display screen; and   a control part that controls the display screen forming part,   wherein the control part controls the display position and/or the display size of the secondary video by affording a command to the display screen forming part using the display auxiliary information, based on an output result of the comparing part.   
   
   
       3 . The decoding apparatus according to  claim 1 ,
 wherein the auxiliary information is transmitted by a data stream independent of the encoding video signal.   
   
   
       4 . The decoding apparatus according to  claim 2 ,
 wherein the auxiliary information is transmitted by a data stream independent of the encoding video signal.   
   
   
       5 . The decoding apparatus according to  claim 1 ,
 wherein the auxiliary information analyzing part is implemented by a processor that executes software programs, and the auxiliary information is afforded as a command to the processor.   
   
   
       6 . The decoding apparatus according to  claim 2 ,
 wherein the auxiliary information analyzing part is implemented by a processor that executes software programs, and the auxiliary information is afforded as a command to the processor.   
   
   
       7 . The decoding apparatus according to  claim 1 ,
 wherein the display size is represented by the respective numbers of horizontal and vertical pixels of an image to be displayed.   
   
   
       8 . The decoding apparatus according to  claim 2 ,
 wherein the display size is represented by the respective numbers of horizontal and vertical pixels of an image to be displayed.   
   
   
       9 . The decoding apparatus according to  claim 1 ,
 wherein the display size is represented by a scale factor of the size of an image to be displayed to an image size of the encoded video signal.   
   
   
       10 . The decoding apparatus according to  claim 2 ,
 wherein the display size is represented by a scale factor of the size of an image to be displayed to an image size of the encoded video signal.   
   
   
       11 . The decoding apparatus according to  claim 1 ,
 wherein the display auxiliary information includes special effect reproduction information about the movement of the display position of the secondary video, and the special effect reproduction information includes a movement amount per unit time, an applied start time at which the application of the display position is started, an applied duration during which the movement of the display position is applied, or an applied end time at which the movement of the display position ends.   
   
   
       12 . The decoding apparatus according to  claim 2 ,
 wherein the display auxiliary information includes special effect reproduction information about the movement of the display position of the secondary video, and the special effect reproduction information includes a movement amount per unit time, an applied start frame ID for which the application of the display position is started, or an applied duration frame count for which the movement of the display position is applied, or an applied end frame ID for which the movement of the display position ends.   
   
   
       13 . The decoding apparatus according to  claim 1 ,
 wherein the auxiliary information includes special effect reproduction information about change of the display size of the secondary video, and the special effect reproduction information includes a change amount of a display scale factor per unit time, an applied start time at which the application of the display size is started, an applied duration during which the change of the display size is applied, or an applied end time at which the change of the display size ends.   
   
   
       14 . The decoding apparatus according to  claim 2 ,
 wherein the auxiliary information includes special effect reproduction information about change of the display size of the secondary video, and the special effect reproduction information includes a change amount of a display scale factor per unit frame, an applied start frame ID for which the application of the display size is started, an applied duration frame count for which the change of the display size is applied, or an applied end time at which the change of the display size ends.   
   
   
       15 . A decoding apparatus comprising:
 a first input part to which a first encoded video signal is inputted;   a second input part to which a second encoded video signal is inputted;   a first decoding part that decodes the first encoded video signal;   a second decoding part that decodes the second encoded video signal;   an output part that outputs video signals decoded by the first and the second decoding parts to display them in a display part; and   a control part that controls information about a display position and/or a display size for the display part, of the video signal decoded by the second decoding part,   wherein the control part performs control so that the video signal decoded by the second decoding part is displayed synchronously with the video signal decoded by the first decoding part.   
   
   
       16 . The decoding apparatus according to  claim 15 ,
 wherein information about time is included in the information about a display position and/or a display size for the display part, and the control part performs control to display the video signal decoded by the second decoding part synchronously with the video signal decoded by the first decoding part according to the information about time.