Method and apparatus of adaptive intra prediction for inter-layer and inter-view coding

An apparatus of inter-layer or inter-view prediction for an inter-layer or inter-view video coding system, wherein video data is configured into a Base Layer (BL) and an Enhancement Layer (EL) for the inter-layer video coding system, and the video data is configured into a Base View (BV) and an Enhancement View (EV) for the inter-view video coding system, the apparatus comprising one or more electronic circuits or processor configured to:

• receive a to-be-processed block in the EL or the EV;
• determine a collocated block in the BL or the BV, wherein the collocated block is located at a location in the BL or the BV corresponding to the to-be-processed block in the EL or in the EV;
• derive a predictor for the to-be-processed block in the EL or the EV from the collocated block in the BL or the BV based on pixel data of the BL or the BV, wherein the predictor corresponds to a linear function of pixel data in the collocated block according to P′EL/EV(x,y)=αP′BL/BV(x,y)+β, wherein P′EL/EV(x,y) corresponds to the predictor for the to-be-processed block in the EL or the EV, P′BL/BV(x,y) corresponds to the pixel data of the collocated block in the BL or the BV, and α and β are parameters, and wherein α and β are derived based on a least-squares method using two pixel sets corresponding to a prediction set (PS) associated with the EL or the EV and a collocated set (CS) associated with the BL or the BV, wherein the PS is formed by first boundary pixels above the to-be-predicted block of the EL or the EV, and second boundary pixels adjacent to the left of the to-be-predicted block of the EL or the EV, and the CS is formed by third boundary pixels above the collocated block of the BL or the BV, and fourth boundary pixels to the left of the collocated block of the BL or the BV;
• and
• encode or decode the to-be-processed block in the EL or the EV using the predictor.

A non-transitory computer readable medium storing a computer-executable program, the computer-executable program, when executed, causing a decoder to perform the following steps:

• receiving a to-be-processed block in an Enhancement Layer (EL) for an inter-layer video coding system or an Enhancement View (EV) for an inter-view video coding system;
• determining a collocated block in a Base Layer (BL) for the inter-layer video coding system or a Base View (BV) for an inter-view video coding system, wherein the collocated block is located at a location in the BL or the BV corresponding to the to-be-processed block in the EL or in the EV;
• deriving a predictor for the to-be-processed block in the EL or the EV from the collocated block in the BL or the BV based on pixel data of the BL or the BV, wherein the predictor corresponds to a linear function of pixel data in the collocated block according to P′EL/EV(x,y)=αP′BL/BV(x,y)+β, wherein P′EL/EV(x,y) corresponds to the predictor for the to-be-processed block in the EL or the EV, P′BL/BV(x,y) corresponds to the pixel data of the collocated block in the BL or the BV, and α and β are parameters, and wherein α and β are derived based on a least-squares method using two pixel sets corresponding to a prediction set (PS) associated with the EL or the EV and a collocated set (CS) associated with the BL or the BV, wherein the PS is formed by first boundary pixels above the to-be-predicted block of the EL or the EV, and second boundary pixels adjacent to the left of the to-be-predicted block of the EL or the EV, and the CS is formed by third boundary pixels above the collocated block of the BL or the BV, and fourth boundary pixels to the left of the collocated block of the BL or the BV;
• and
• decoding the to-be-processed block in the EL or the EV using the predictor.