Inter-layer motion vector scaling for scalable video coding

A method of inter-layer prediction for scalable video coding, wherein video sequence data is configured into a Base Layer (BL) and an Enhancement Layer (EL) and wherein an EL picture in the EL has higher spatial resolution than a BL picture in the BL, the method comprising:

• receiving image size information regarding the EL picture and the BL picture of the video sequence;
• determining an inter-layer position-mapping scaling factor based on the image size information regarding the EL picture and the BL picture;
• determining BL mapping positions corresponding to EL pixel positions based on the EL pixel positions and the inter-layer position-mapping scaling factor;
• and
• providing an up-sampled BL picture at the BL mapping positions for inter-layer coding of the EL picture,
• wherein the inter-layer position-mapping scaling factor is determined from a ratio of biased-pre-scaled cropped BL picture resolution to the cropped EL picture resolution, wherein the biased-pre-scaled cropped BL picture resolution is obtained by adding a bias value to pre-scaled cropped BL picture resolution, and wherein the pre-scaled cropped BL picture resolution is derived by applying arithmetic left shift by N bits to the cropped BL picture resolution and N is a non-negative integer.

A method of inter-layer prediction for scalable video coding, wherein video sequence data is configured into a Base Layer (BL) and an Enhancement Layer (EL) and wherein an EL picture in the EL has higher spatial resolution than a BL picture in the BL, the method comprising:

• receiving image size information regarding the EL picture and the BL picture of the video sequence;
• determining an inter-layer position-mapping scaling factor based on the image size information regarding the EL picture and the BL picture;
• determining BL mapping positions corresponding to EL pixel positions based on the EL pixel positions and the inter-layer position-mapping scaling factor;
• and
• providing an up-sampled BL picture at the BL mapping positions for inter-layer coding of the EL picture, wherein the BL mapping position for a given EL pixel position is determined by adding a first offset term to a first product, wherein the first offset term corresponds to BL picture first edge, the first product is obtained by multiplying the inter-layer position-mapping scaling factor by a first distance from the given EL pixel position to EL picture first edge.