Frame advance and slide show trick modes
View Patent ↗A method of performing a trick mode on a video signal includes the steps of receiving a trick mode command and repeating a picture in the video signal to form a trick mode video signal in response to the trick mode command. If the picture being repeated is a bi-directional predictive picture, then the method can limit the repeating step to a predetermined number of times.
1. A method of performing a trick mode on a video signal, comprising the steps of:
in response to a trick mode command, repeating a picture in a group of pictures in the video signal to form a trick mode video signal by a processor;
determining whether to impose an upper limit on said repeating step, based on a picture type of the picture being repeated, by determining if the picture being repeated is a bi-directional predictive picture; and
selectively limiting the repeating step to a predetermined number of times up to a maximum number of pictures allowed in the group of pictures for a given standard only if the picture being repeated is a bi-directional predictive picture.
2. The method according to claim 1 , wherein the trick mode comprises a frame advance trick mode.
3. The method according to claim 1 , wherein the method further comprises the step of setting a display indicator of a subsequent adjacent picture to the repeated bi-directional predictive picture to a predetermined value limited to the maximum number of pictures allowed in the group of pictures.
4. The method according to claim 1 , wherein the display indicator comprises a temporal reference field having an integer value.
5. The method according to claim 1 , wherein the trick mode comprises a slide show trick mode.
6. The method according to claim 1 , wherein the trick mode comprises a field advance trick mode, and wherein each field in the picture is repeatedly displayed until a subsequent field is decoded.
7. The method according to claim 1 , wherein at least a portion of the trick mode video signal is decoded by a remote decoder.
8. The method according to claim 1 , wherein the method further comprises the step of successively increasing a temporal reference field for each of the pictures being repeated and limiting the temporal reference field of a last picture in a group of pictures to a maximum number allowed in a group of pictures for a given standard.
9. The method according to claim 1 , wherein the method further comprises the step of setting a temporal reference field of the picture being repeated to a value of a temporal reference field for the picture.
10. A method of performing a trick mode on a video signal, comprising the steps of:
in response to an advance trick mode command, repeating a bidirectional predictive picture in a group of pictures in the video signal to form a trick mode video signal by a processor, wherein the bidirectional predictive picture contains a display indicator having a display indicator value;
determining whether to impose an upper limit on said repeating step, based on a picture type of the picture being repeated, by determining if the picture being repeated is a bi-directional predictive picture
selectively limiting the repeating step to a predetermined number of times up to a maximum number of pictures allowed in the group of pictures for a given standard only if the picture being repeated is a bidirectional predictive picture; and
setting the display indicator of the repeated bidirectional predictive picture to the display indicator value.
11. The method according to claim 10 , wherein at least a portion of the trick mode video signal is decoded by a remote decoder.
12. The method according to claim 10 , wherein a last picture in a group of pictures of the video signal is set to the maximum number allowed in a group of pictures for a given standard.
13. The method according to claim 10 , wherein the advance trick mode command comprises a frame advance trick mode command requiring a repeat of at least one bi-directional predictive frame picture.
14. The method according to claim 10 , wherein the advance trick mode command comprises a field advance trick mode command requiring a repeat of at least one bi-directional predictive field picture.
15. A system for performing a trick mode on a video signal, comprising:
a controller for reading data from a storage medium and outputting the video signal; and
a processor programmed to:
receive a trick mode command;
in response to the advance trick mode command, repeat a bi-directional picture of an original bi-directional picture in a group of pictures in the video signal to form a trick mode video signal, wherein the picture contains a display indicator;
determine whether to impose an upper limit on said repeating step, based on a picture type of the picture being repeated, by determining if the picture being repeated is a bi-directional predictive picture
selectively limit the repeating of the bi-directional picture to a predetermined number of times up to a maximum number of pictures allowed in the group of pictures for a given standard only if the picture being repeated is a bidirectional predictive picture; and
set the display indicator of the repeated picture in the trick mode video signal to a value for the original bi-directional picture.
16. The system according to claim 15 , wherein the processor is further programmed to set the display indicator of a subsequent picture of the video signal to the maximum value allowed for a group of pictures for a given standard.
17. The system according to claim 15 , wherein the trick mode comprises an advance trick mode.
18. The system according to claim 15 , wherein the picture to be repeated comprises a bidirectional predictive picture.
19. The system according to claim 15 , wherein the display indicator comprises a temporal reference field having an integer value.
20. The system according to claim 16 , wherein the advance trick mode is selected from the group of modes comprising a frame advance trick mode, a frame 3 slide show trick mode, a field advance trick mode and a field slide show trick mode.
21. The system according to claim 15 , wherein at least a portion of the trick mode video signal is decoded by a remote decoder.
22. A system for performing a trick mode on a video signal, comprising:
a controller for reading data from a storage medium and outputting the video signal; and
a processor programmed to:
receive an advance trick mode command;
in response to the advance trick mode command, repeat a picture in a group of pictures in the video signal to form a trick mode video signal, wherein the picture contains a display indicator;
determine whether to impose an upper limit on a number of times the picture is repeated, based on a picture type of the picture, by determining if the picture is a bi-directional predictive picture; and
selectively limit the number of times the picture is repeated to a predetermined number of times up to a maximum number of pictures allowed in the group of pictures for a given standard only if the picture is a bi-directional predictive picture.
23. The system according to claim 22 , further comprising a remote decoder for decoding at least a portion of the trick mode video signal.