System and method of transmission and reception of progressive content with isolated fields for conversion to interlaced display
View Patent ↗Systems and methods of coding progressive content with isolated fields for conversion to interlaced display are provided. Some systems and methods may find use in, for example, digital video compression systems and methods. Film material may be encoded as video material with an intended field polarity and an explicit 3:2 pull-down operation for interlaced display (e.g., a 30-frames-per-second display).
1. A system for facilitating a display of a video, the system comprising:
an encoder operable to encode a film material as a video with a field polarity and a 3:2 pull-down operation for an interlaced display format,
wherein the encoder is operable to insert an isolated field with the field polarity, and the encoder is operable to generate a time stamp for a particular picture without knowledge of a film mode state of the particular picture.
2. The system according to claim 1 , wherein the encoder is operable to insert the isolated field between a first frame and a second frame to achieve 3:2 pull-down for coding the film material.
3. The system according to claim 1 , wherein the encoder is operable to encode a 24 frames-per-second film sequence as a 30 frames-per-second video sequence for transmission.
4. The system according to claim 1 , wherein the encoder is operable to encode the film material into a bitstream.
5. The system according to claim 4 , wherein the bitstream comprises an alternate field polarity scheme.
6. The system according to claim 5 , wherein a polarity of a field other than the isolated field is determined from at least the field polarity of the isolated field.
7. The system according to claim 1 , wherein the encoder is operable to generate a decoding time stamp (DTS) or a presentation time stamp (PTS) for a particular picture without knowledge of a particular film mode state of the particular picture.
8. The system according to claim 1 , wherein the encoder is operable to generate a DTS or a PTS for the inserted isolated field.
9. The system according to claim 1 , further comprising:
a decoder coupled to the encoder via a network.
10. The system of claim 1 , wherein the encoder is operable to insert the isolated field with an indication of the field polarity of the isolated field.
11. The system of claim 1 , wherein the encoder is operable to indicate field polarity of inserted isolated fields and not indicate polarity of fields associated with a frame.
12. The system of claim 1 , wherein the inserted isolated field is predicted from at least a field of a frame immediately preceding the inserted isolated field.
13. A system for facilitating a display of a video, the system comprising:
an encoder operable to encode a film material as a video with a field polarity and a 3:2 pull-down operation for an interlaced display format, wherein the encoder is operable to insert an isolated field with the field polarity; and
a decoder coupled to the encoder via a network, wherein the decoder is operable to determine a decoding time or a presentation time for a particular picture based upon at least one DTS or at least one PTS for a previously decoded picture.
14. The system according to claim 13 , wherein the decoder is operable to determine the decoding time or the presentation time for the particular picture using a particular frame rate or a particular field rate.
15. The system according to claim 14 , wherein the particular frame rate or the particular field rate is indicated in a bitstream comprising encoded film material received from the encoder.
16. A system for facilitating a display of a video, the system comprising:
an encoder operable to encode a film material as a video with a field polarity and a 3:2 pull-down operation for an interlaced display format, wherein the encoder is operable to insert an isolated field with the field polarity; and
a decoder coupled to the encoder via a network, wherein the decoder is operable to detect and to remove the isolated field.
17. A system for facilitating a display of a video, the system comprising:
an encoder operable to encode a film material as a video with a field polarity and a 3:2 pull-down operation for an interlaced display format, wherein the encoder is operable to insert an isolated field with the field polarity; and
a decoder coupled to the encoder via a network, wherein the decoder is operable to decode and to present a video sequence without using a film mode flag.
18. A method for facilitating a display of a video, comprising:
encoding a source material as a video material with a field polarity and a 3:2 pull-down operation for an interlaced display format;
wherein the encoding comprises:
inserting an isolated field with the field polarity between two frames to achieve 3:2 pull-down for coding the source material; and
encoding the source material without specific knowledge concerning film mode states of the source material.
19. The method according to claim 18 , wherein a polarity of a field other than the isolated field is determined based upon at least the field polarity of the isolated field.
20. The method according to claim 18 , further comprising:
encoding progressive content with one or more of the isolated fields for conversion into the interlaced display format.
21. The method according to claim 18 , wherein the encoded source material forms a bitstream.
22. The method according to claim 18 , further comprising:
generating a time stamp for a coded frame or a coded field.
23. The method according to claim 18 , further comprising: detecting and removing the isolated field.
24. A method for facilitating a display of a video, the method comprising:
encoding a source material as a video material with a field polarity and a 3:2 pull-down operation for an interlaced display format, wherein the encoding comprises inserting an isolated field with the field polarity between two frames to achieve 3:2 pull-down for coding the source material and
determining a time stamp for a particular coded picture based upon a value of a previous time stamp of a previous coded picture.
25. The method according to claim 24 , further comprising:
determining a time stamp for a particular coded picture based upon a frame rate or a field rate.
26. The method according to claim 25 , further comprising:
indicating the frame rate or the field rate in a bitstream comprising the encoded source material.
27. A method for facilitating a display of a video, the method comprising:
encoding a source material as a video material with a field polarity and a 3:2 pull-down operation for an interlaced display format, wherein the encoding comprises inserting an isolated field with the field polarity between two frames to achieve 3:2 pull-down for coding the source material; and
providing a time stamp for a particular picture without knowledge of a film mode state of the particular picture.
28. A method for facilitating a display of a video, the method comprising:
encoding a source material as a video material with a field polarity and a 3:2pull-down operation for an interlaced display format, wherein the encoding comprises inserting an isolated field with the field polarity between two frames to achieve 3:2 pull-down for coding the source material; and
decoding and presenting a video sequence without using a film mode flag.
29. A system for facilitating a display of a video, the system comprising:
an encoder operable to encode a film material as a video with a field polarity and a 3:2 pull-down operation for an interlaced display format, wherein:
the encoder is operable to insert an isolated field with the field polarity;
and
the encoder is operable to encode the film material such that the frame rate and buffer removal times are consistent with or without the use of a film mode.