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An apparatus, a method and a computer program for image sequence coding and decoding

A sequence and coding technology, applied in the field of image sequence coding and decoding devices, can solve problems such as difficulty

Active Publication Date: 2017-08-01
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in known methods, random access to any sample may require decoding all reference pictures starting from previous IDR pictures etc., since it may not be easy to conclude which subset of reference pictures needs to be decoded

Method used

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  • An apparatus, a method and a computer program for image sequence coding and decoding
  • An apparatus, a method and a computer program for image sequence coding and decoding
  • An apparatus, a method and a computer program for image sequence coding and decoding

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Embodiment Construction

[0057] Suitable means and possible mechanisms for identifying pictures that need to be decoded in order to correctly decode the desired random access picture are described in more detail below. In this regard, first refer to figure 1 and figure 2 ,in figure 1A block diagram of a video encoding system according to an example embodiment is shown as a schematic block diagram of an example apparatus or electronic device 50, which may integrate a codec according to an embodiment of the invention. figure 2 A layout of an apparatus according to an example embodiment is shown. will be explained next figure 1 and figure 2 components.

[0058] The electronic device 50 may eg be a mobile terminal or user equipment of a wireless communication system. It should be understood, however, that embodiments of the present invention may be implemented within any electronic device or apparatus that may require encoding and decoding video images, or encoding or decoding video images.

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Abstract

A method for signaling reference pictures of a picture sequence encoded in a bitstream, the method comprising classifying pictures of the picture sequence into reference pictures and non-reference pictures; providing each reference picture with a unique picture identifier; determining, at least for inter-coded picturesof the picture sequence, all unique combinations of the picture identifier and at least one reference picture identifier, where the at least one reference picture identifier for a particular picture identifies all pictures that may be used as a reference for predicting said particular picture;and assigning intra-coded reference pictures at least with their unique picture identifier and the inter-coded pictures with their corresponding unique combination of the picture identifier and the at least one reference picture identifier.

Description

technical field [0001] The present invention relates to an apparatus, method and computer program for encoding and decoding of image sequences. Background technique [0002] A video codec consists of an encoder that converts the images of an input video into a compressed representation suitable for storage / transmission, and a decoder that decompresses the compressed video representation back into a viewable form. A sequence of images can be compressed as a sequence of still pictures coded by means of spatial prediction or as an intra-picture coded by means of spatial and temporal prediction. Image sequences with random access and support for editing individual pictures are traditionally enabled by representing the sequence as a series of independently coded intra pictures. Such formats include, for example, Motion JPEG, Animated GIF, and H.264's Intra Profile. [0003] If the image sequence is represented as a series of still pictures, coding efficiency is generally poor, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/70H04N19/159G06T9/00
CPCH04N19/105H04N19/107H04N19/46H04N19/503H04N19/61H04N19/70H04N19/85H04N19/172
Inventor V·K·玛拉玛尔瓦达基塔尔M·安尼克塞拉
Owner NOKIA TECHNOLOGLES OY