US 2019/0058880 A1 · COMPRESSING GROUPS OF VIDEO FRAMES USING REVERSED ORDERING

Abstract

Groups of video frames can be compressed using reversed ordering. For a group of a video sequence having a display order, a determination is made as to whether to arrange the group in a reversed display order before a prediction process of an encoder for the group. Responsive thereto, the group is arranged in the reversed display order as an input order to the prediction process. Otherwise, the group is provided to the prediction process in the display order as the input order. In performing the prediction process, the group, received in the input order, is arranged in a coding order using a group coding structure that defines at least one backward reference frame for inclusion within a set of candidate reference frames. Multiple backward reference frames may also be defined. The group is predicted in the coding order using the set of candidate reference frames.

Claims20

Dependent claims

A method, comprising:

before a prediction process of an encoder for a group of frames, the group of frames formed of a proper subset of frames of a video sequence having a display order, determining whether to arrange the group of frames in a reversed display order;
responsive to a determination to arrange the group of frames in the reversed display order, arranging the group of frames in the reversed display order before the prediction process for the group of frames;
and
performing the prediction process for the group of frames by:
receiving the group of frames as input to the prediction process in an input order, the input order comprising one of the display order or the reversed display order;
arranging the group of frames, received in the input order, in a coding order using a group coding structure that defines at least one backward reference frame for inclusion within a set of candidate reference frames;
and
predicting the group of frames in the coding order using the set of candidate reference frames.

5 more elements

A method, comprising:

determining, from an encoded bitstream, whether a prediction process of an encoder received a group of frames as input in one of a display order or a reversed display order, the group of frames formed of a proper subset of frames of a video sequence having the display order;
performing a prediction process of a decoder for the group of frames by:
receiving, from the encoded bitstream, the group of frames as input to the prediction process of the decoder in a coding order arranged using a group coding structure that defines at least one backward reference frame for inclusion within a set of candidate reference frames;
and
predicting the group of frames in the coding order using the set of candidate reference frames;
generating a decoded group of frames using prediction results of the prediction process;
and
responsive to a determination that the prediction process of the encoder received the group of frames as input in the reversed display order:
buffering the decoded group of frames;
and
outputting the buffered decoded frames in the display order.

8 more elements

An apparatus, comprising:

a processor;
and
a non-transitory storage medium that includes instructions executable by the processor to carry out a method comprising:
determining, from an indication in an encoded bitstream, whether a prediction process of an encoder received a group of frames in an input order, the input order comprises one of a display order or a reversed display order, and the group of frames formed of a proper subset of frames of a video sequence having the display order;
performing a prediction process of a decoder for the group of frames by:
receiving, from the encoded bitstream, the group of frames as input to the prediction process of the decoder in a coding order arranged using a group coding structure that modifies the input order such that an individual frame of the group of frames input to the prediction process before an adjacent, preceding frame only if the individual frame is used as a backward prediction frame within a set of candidate reference frames;
and
predicting the group of frames in the coding order using the set of candidate reference frames;
generating a decoded group of frames using prediction results of the prediction process;
and
responsive to the input order being the reversed display order:
buffering each of the decoded group of frames until all of the frames of the decoded group of frames are generated;
and
outputting the buffered decoded group of frames in the display order only after all of the frames of the decoded group of frames are buffered.

11 more elements

Dependencies are inferred from the claim text.

Compressing groups of video frames using reversed ordering

Life of this patent

Compressing groups of video frames using reversed ordering

Life of this patent

Abstract

Claims20