Apparatus, a method and a computer program for video coding and decoding
摘要
說(shuō)明書(shū)
The forward view synthesis process may comprise two conceptual steps: forward warping and hole filling. In forward warping, each pixel of the reference image is mapped to a synthesized image. When multiple pixels from reference frame are mapped to the same sample location in the synthesized view, the pixel associated with a larger depth value (closer to the camera) may be selected in the mapping competition. After warping all pixels, there may be some hole pixels left with no sample values mapped from the reference frame, and these hole pixels may be filled in for example with a line-based directional hole filling, in which a “hole” is defined as consecutive hole pixels in a horizontal line between two non-hole pixels. Hole pixels may be filled by one of the two adjacent non-hole pixels which have a smaller depth sample value (farther from the camera).
In a scheme referred to as a backward view synthesis or backward-projected view synthesis, the depth map co-located with the synthesized view is used in the view synthesis process. View synthesis prediction using such backward view synthesis may be referred to as backward view synthesis prediction or backward-projected view synthesis prediction or B-VSP. To enable backward view synthesis prediction for the coding of the current texture view component, the depth view component of the currently coded/decoded texture view component is required to be available. In other words, when the coding/decoding order of a depth view component precedes the coding/decoding order of the respective texture view component, backward view synthesis prediction may be used in the coding/decoding of the texture view component.
