Method and Apparatus for Using a Current Picture as a Reference Picture
First Claim
1. A method of managing a DPB (decoded picture buffer) for a video coding system, wherein the video coding system uses coding modes including an Inter prediction mode and an Intra Block Copy (IntraBC) mode, comprising:
- determining a current-picture-usage flag in a picture level or slice level, wherein the current-picture-usage flag indicates whether the IntraBC mode is enabled for a current picture and the current picture is allowed to be used as a reference picture for the current picture;
if the current-picture-usage flag indicates that the IntraBC mode is not enabled and the current picture is not allowed to be used as the reference picture for the current picture;
allocating only one picture buffer in the DPB (decoded picture buffer) for the current picture; and
storing a reconstructed current picture after in-loop filtering or the reconstructed current picture before the in-loop filtering in said one picture buffer in the DPB; and
if the current-picture-usage flag indicates that the IntraBC mode is enabled for the current picture and the current picture is allowed to be used as the reference picture for the current picture;
allowing to allocate up to two picture buffers in the DPB for the current picture; and
allowing to store both the reconstructed current picture after the in-loop filtering and the reconstructed current picture before the in-loop filtering in said up to two picture buffers in the DPB.
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Accused Products
Abstract
Methods and apparatus of managing decoded picture buffer for a video coding system are disclosed for a system using an Inter prediction mode and an Intra Block Copy mode. According to one method, a current-picture-usage flag in a picture or slice level is determined. If the current-picture-usage flag indicates that the current picture is not allowed to be used as the reference picture for the current picture, only one picture buffer is allocated in a DPB (decoded picture buffer) for the current picture and a reconstructed current picture after in-loop filtering is stored in the picture buffer in the DPB. According to another method, the system allocates only one picture buffer in the DPB for both the Inter prediction mode and the Intra Block Copy mode of the current picture if all of one or more in-loop filters are disabled for the entire part of the current picture.
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Citations
11 Claims
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1. A method of managing a DPB (decoded picture buffer) for a video coding system, wherein the video coding system uses coding modes including an Inter prediction mode and an Intra Block Copy (IntraBC) mode, comprising:
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determining a current-picture-usage flag in a picture level or slice level, wherein the current-picture-usage flag indicates whether the IntraBC mode is enabled for a current picture and the current picture is allowed to be used as a reference picture for the current picture; if the current-picture-usage flag indicates that the IntraBC mode is not enabled and the current picture is not allowed to be used as the reference picture for the current picture; allocating only one picture buffer in the DPB (decoded picture buffer) for the current picture; and storing a reconstructed current picture after in-loop filtering or the reconstructed current picture before the in-loop filtering in said one picture buffer in the DPB; and if the current-picture-usage flag indicates that the IntraBC mode is enabled for the current picture and the current picture is allowed to be used as the reference picture for the current picture; allowing to allocate up to two picture buffers in the DPB for the current picture; and allowing to store both the reconstructed current picture after the in-loop filtering and the reconstructed current picture before the in-loop filtering in said up to two picture buffers in the DPB. - View Dependent Claims (2, 3, 4)
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5. A method of managing a DPB (decoded picture buffer) for a video coding system, wherein the video coding system uses coding modes including an Inter prediction mode and an Intra Block Copy (IntraBC) mode, comprising:
determining whether one or more in-loop filters are used for an entire part of a current picture; and if all of said one or more in-loop filters are disabled for the entire part of the current picture; allocating only one picture buffer in the DPB (decoded picture buffer) for both the Inter prediction mode and the Intra Block Copy (IntraBC) mode of the current picture; and storing only an unfiltered version of a reconstructed current picture in said one picture buffer. - View Dependent Claims (6, 7, 8, 9)
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10. An apparatus for managing a DPB (decoded picture buffer) for a video coding system, wherein the video coding system uses coding modes including an Inter prediction mode and an Intra Block Copy (IntraBC) mode, comprising one or more electronic circuits arranged to:
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determine a current-picture-usage flag in a picture level or slice level, wherein the current-picture-usage flag indicates whether the IntraBC mode is enabled for a current picture and the current picture is allowed to be used as a reference picture for the current picture; if the current-picture-usage flag indicates that the IntraBC mode is not enabled and the current picture is not allowed to be used as the reference picture for the current picture; allocate only one picture buffer in the DPB (decoded picture buffer) for the current picture; and store a reconstructed current picture after in-loop filtering or the reconstructed current picture before the in-loop filtering in said one picture buffer in the DPB; and if the current-picture-usage flag indicates that the IntraBC mode is enabled for the current picture and the current picture is allowed to be used as the reference picture for the current picture; allow to allocate up to two picture buffers in the DPB for the current picture; and allow to store the reconstructed current picture after the in-loop filtering and the reconstructed current picture before the in-loop filtering in said up to two picture buffers in the DPB.
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11. An apparatus for managing a DPB (decoded picture buffer) for a video coding system, wherein the video coding system uses coding modes including an Inter prediction mode and an Intra Block Copy (IntraBC) mode, comprising one or more electronic circuits arranged to:
determine whether one or more in-loop filters are used for an entire part of a current picture; and if all of said one or more in-loop filters are disabled for the entire part of the current picture; allocate only one picture buffer in the DPB (decoded picture buffer) for both the Inter prediction mode and the Intra Block Copy (IntraBC) mode of the current picture; and store only an unfiltered version of a reconstructed current picture in said one picture buffer.
Specification