Qualcomm Incorporated (San Diego, CA)

A video decoder can take pictures out of an uncoded buffer by with the help of an explicit coded syntax element. A video decoder could be set to decode a syntax indicating a picture to remove from a decoded picture buffer and remove the previous image from the DPB. The video decoder will decode the present picture and save it in the DPB.

There are many devices that have digital video features, for instance digital TVs, digital direct broadcasts systems, wireless broadcasting systems Personal digital assistants (PDAs) tablets computers, laptops or desktop computers and tabletcomputers. These include digital cameras and digital recording equipment. Video players and digital media players. games devices, satellite or cell phones, also known as smart phones as well as video teleconferencing devices, streaming devices and others. Digital video devices use video coding techniques such as those described in MPEG-2, MPEG-4 and ITU.T H.263, ITU.T H.264/MPEG-4 Part 10, Advanced Video Coding, (AVC), ITU.T H.265/High Efficiency VideoCoding, (HEVC), and extensions to such standards. These techniques for video coding allow video devices to transmit as well as receive video data efficiently.

Video coding techniques can comprise spatial (intrapicture) and/or temporal prediction to reduce redundancy in video sequences. Block-based video coding employs the term “video slice,” that could be an element of a picture or a video image, to split into video blocks. These may be referred to as coding tree units, coding units code nodes, or CUs. Video blocks inside the intra-coded slices (I) of a picture may be encoded with spatial prediction in relation to the reference samples of a neighboring blocks within the same image. Video blocks in an inter-coded (P or B) slice of a photograph may employ spatial prediction based on references samples found in blocks in the same picture ortemporal prediction with respect to references samples from other reference pictures. Frames can be referred to as pictures and reference photos may be called reference frames.

Video coders (e.g. video encoders and decoders) can use a decoded picture buffer (DPB) to save decoded pictures. Display of decoded images may be feasible. Additionally, decoded pictures stored in the DPB could be used as reference images to aid in inter-prediction. Pictures are stored in the DPB as long as the pictures remain usable as reference pictures. To allow room for new decoded images, pictures must be removed from the DPB. Pictures are usually removed from a DPB by an image marking process that is based upon the reference pictures lists. If a picture isn’t in the reference list, or isn’t specified as being required to be output, the coder could declare it “unused for reference” and remove it from the DPB.

This disclosure outlines general methods to use for DPB administration. It also outlines methods to take pictures off a DPB. In certain instances the disclosure provides DPB indexing techniques. Instead of performing a picture marking process where images are marked as unusable and removed from DPB by reference to pictures in an index or reference list, a coder could create the DPB index that clearly indicates which images can be removed from DPB to make space for the currently coded image.

DPB indexing methods of the disclosure could allow for more flexibility in signaling reference picture lists. There is no need to specify which images to keep. Signaling which pictures are to be included in the DPB is done by including images in an index of reference. However, some pictures are just signaled in the reference list of a present image that is to be saved for later images (e.g. transferred) however, these pictures are not used to identify the current picture. With this disclosure, a video encoder could signal an index (e.g. one called a DPB index) to indicate a picture that can either be replaced or bumped from theDPB. This means that only the pictures actually used for reference need to be included in the reference list of pictures. This reduces the overhead of signaling and improves coding efficiency.

The process of removing pictures from the DPB is a simple process due to the fact that the pictures to be removed are identified by the DPB Index. Since the image or photos to be eliminated are signaled with the DPB index, it’s not necessary to check whether they are still needed to be output.

In one case, a method includes decoding a first syntax element which indicates a first picture to remove from a DPB and removing the initial picture from the DPB, decoding a current image, and then keeping the decoded picture within the DPB.

Another example is a device that has a memory for video data and one or several processors. The processors are designed to recognize the first syntax element that indicates the first picture that needs that needs to be removed from a DPB. Decode the current image and save it in the DPB.

Another instance is a device which contains a means of decoding the first syntax element that signifies the first picture that needs to be taken out of a DPB. It also includes ways to remove the first image from the DPB and decoding the current image and means for storing this decoded image inside the DPB.

In a different way, a computer-readable storage medium is encoded with instructions that, when executed trigger a processor programmable to decode a first syntax element that indicates an initial picture to be removed from a DPB, remove the first picture from the DPB and decode a new image, and save the decoded picture inside the DPB.

You can find the details for each example in the drawings accompanying them as well as the description. The claims, drawings, as well as the description will also reveal additional features benefits, features, and other objects.

Click here to view the patent on USPTO website.


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