Motion field upsampling for scalable coding based on high efficiency video coding

A method of encoding video information, the method comprising:

• receiving video data associated with a first layer having a first spatial resolution and a corresponding second layer having a second spatial resolution, wherein the first spatial resolution is less than the second spatial resolution, the video data including at least motion field information associated with the first layer;
• for each respective block of an inter-layer reference picture usable to predict the second layer and having a plurality of blocks:
• determining whether a corresponding portion of the first layer corresponding to the respective block is intra coded;
• and
• performing one of (i) based on determining that the corresponding portion of the first layer is intra coded, setting a coding mode associated with the respective block of the inter-layer reference picture to be an intra mode, or (ii) based on determining that the corresponding portion of the first layer is not intra coded, upsampling motion field information associated with the corresponding portion of the first layer and associate the upsampled motion field information with the respective block;
• adding the inter-layer reference picture to a reference picture list to be used for inter prediction of at least a portion of the second layer;
• predicting at least a portion of the second layer based on the inter-layer reference picture;
• and
• signaling at least one syntax element associated with the second layer in a bitstream,
• wherein for each N×N block in the second layer:
• mapping a center position to a unique position in the first layer, and
• deriving motion field information of the entire N×N block in the second layer from the upsampled motion field information associated with the unique position in the first layer, wherein N can be at least 16, wherein each N×N block in the second layer has a particular co-located N×N block in the inter-layer reference picture, the particular N×N block having a co-located block in the first layer from which the motion field information is up sampled for the particular N×N block of the inter-layer reference picture.

A method of decoding video information, the method comprising:

• receiving syntax elements extracted from an encoded video bitstream, wherein the syntax elements comprise video data associated with a first layer having a first spatial resolution and a corresponding second layer having a second spatial resolution, wherein the first spatial resolution is less than the second spatial resolution, the video data including at least motion field information associated with the first layer;
• for each respective block of an inter-layer reference picture usable to predict the second layer and having a plurality of blocks:
• determining whether a corresponding portion of the first layer corresponding to the respective block is intra coded;
• and
• performing one of (i) based on determining that the corresponding portion of the first layer is intra coded, setting a coding mode associated with the respective block of the inter-layer reference picture to be an intra mode, or (ii) based on determining that the corresponding portion of the first layer is not intra coded, upsampling motion field information associated with the corresponding portion of the first layer and associate the upsampled motion field information with the respective block;
• adding the inter-layer reference picture to a reference picture list to be used for inter prediction of at least a portion of the second layer;
• and
• predicting at least a portion of the second layer based on the inter-layer reference picture,
• wherein for each N×N block in the second layer:
• mapping a center position to a unique position in the first layer, and
• deriving motion field information of the entire N×N block in the second layer from the upsampled motion field information associated with the unique position in the first layer, wherein N can be at least 16, wherein each N×N block in the second layer has a particular co-located N×N block in the inter-layer reference picture, the particular N×N block having a co-located block in the first layer from which the motion field information is up sampled for the particular N×N block of the inter-layer reference picture.

A non-transitory computer readable medium comprising code that, when executed, causes an apparatus to:

• store video data associated with a first layer having a first spatial resolution and a corresponding second layer having a second spatial resolution, wherein the first spatial resolution is less than the second spatial resolution, the video data including at least motion field information associated with the first layer;
• for each respective block of an inter-layer reference picture usable to predict the second layer and having a plurality of blocks:
• determine whether a corresponding portion of the first layer corresponding to the respective block is intra coded;
• and
• perform one of (i) based on a determination that the corresponding portion of the first layer is intra coded, set a coding mode associated with the respective block of the inter-layer reference picture to be an intra mode, and (ii) based on a determination that the corresponding portion of the first layer is not intra coded, upsample motion field information associated with the corresponding portion of the first layer and associate the upsampled motion field information with the respective block;
• add the inter-layer reference picture to a reference picture list to be used for inter prediction of at least a portion of the second layer;
• and
• predict at least a portion of the second layer based on the inter-layer reference picture,
• wherein for each N×N block in the second layer, the code, when executed, further causes the apparatus to:
• map a center position to a unique position in the first layer, and
• derive motion field information of the entire N×N block in the second layer from the upsampled motion field information associated with the unique position in the first layer, wherein N can be at least 16, wherein each N×N block in the second layer has a particular co-located N×N block in the inter-layer reference picture, the particular N×N block having a co-located block in the first layer from which the motion field information is up sampled for the particular N×N block of the inter-layer reference picture.

A video coding device configured to code video information, the video coding device comprising:

• means for storing video data associated with a first layer having a first spatial resolution and a corresponding second layer having a second spatial resolution, wherein the first spatial resolution is less than the second spatial resolution, the video data including at least motion field information associated with the first layer;
• means for performing, for each respective block of an inter-layer reference picture usable to predict the second layer and having a plurality of blocks:
• determining whether a corresponding portion of the first layer corresponding to the respective block is intra coded;
• and
• performing one of (i) based on determining that the corresponding portion of the first layer is intra coded, setting a coding mode associated with the respective block of the inter-layer reference picture to be an intra mode, and (ii) based on determining that the corresponding portion of the first layer is not intra coded, upsampling motion field information associated with the corresponding portion of the first layer and associate the upsampled motion field information with the respective block;
• means for adding the inter-layer reference picture to a reference picture list to be used for inter prediction of at least a portion of the second layer;
• means for predicting at least a portion of the second layer based on the inter-layer reference picture, and
• for each N×N block in the second layer:
• means for mapping a center position to a unique position in the first layer, and
• means for deriving motion field information of the entire N×N block in the second layer from the upsampled motion field information associated with the unique position in the first layer, wherein N can be at least 16, wherein each N×N block in the second layer has a particular co-located N×N block in the inter-layer reference picture, the particular N×N block having a co-located block in the first layer from which the motion field information is upsampled for the particular N×N block of the inter-layer reference picture.