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Video coding with helper data for spatial intra-prediction

A predictive value and video stream technology, applied in the field of image and video encoding, decoding and storage, can solve the problems of unreliable prediction tendency and unpredictable texture category, etc.

Inactive Publication Date: 2018-07-31
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This scheme is able to model some types of structures in blocks well, but at the same time it cannot predict some common texture classes
For example, orientation-sample predictions are able to accurately model shapes that match supported predicted orientations, but as one moves farther away from the reference sample, the predicted propensities become less reliable and often align with some of the chosen predicted orientations. Forecast Errors Begin to Emerge

Method used

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  • Video coding with helper data for spatial intra-prediction
  • Video coding with helper data for spatial intra-prediction
  • Video coding with helper data for spatial intra-prediction

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Experimental program
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Embodiment Construction

[0017] Video is a sequential stream of individual pictures or images, and video coding takes advantage of the fact that, in a discrete set of images, usually most images remain the same or change only slightly. Since such an image can be constructed with reference to other images that are sequentially close around the picture of interest and with reference to other parts of the same image, individual images of a video are often referred to as frames. Video encoding / decoding thus uses both inter prediction, which predicts a subject frame from one or more other frames, and intra prediction, which predicts a part of a subject frame from one or more other parts of the subject frame . A codec generally refers to software that performs a specific encoding and decoding process, but in principle nothing prevents a codec from being embodied in hardware (circuitry) or in a combination of hardware and software. To better understand these teachings provide advantages over conventional co...

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Abstract

For decoding a video stream, an encoded video stream is received with an indication of a prediction mode and an indication of one or more prediction helper values. While decoding this encoded video stream, a predicted value is calculated for each of at least one sample based on the indicated prediction mode and on the prediction helper value(s). The decoded video stream, incorporating each of theat least one samples as decoded using the respective calculated predicted value,is then output to at least one of a computer readable memory and a graphical display. An optional step function can be utilized to aid the helper values and enable non-linear prediction values in a given row or column of a prediction unit. At the encoder side the encoder decides the prediction helper values that it uses to encode the video stream that is stored or transmitted to the decoder.

Description

technical field [0001] The described invention relates to the processing of digital images and videos, and in particular to the encoding and decoding of such images and videos and their storage for telecommunications. Background technique [0002] The acronyms (Acronyms) used herein are listed below after the detailed description. Recommendations ITU-TH.263 and H.264 (04 / 2015) provide typical hybrid video codecs as they encode video information in two stages. First, the pixel values ​​in a certain picture area (called "block") are predicted, eg by means of motion compensation or by spatial means. Motion compensation typically involves finding and indicating an area in one of the previously encoded video frames that closely corresponds to the block being encoded; spatial arrangement typically involves using pixel values ​​around the block to be encoded in a specified manner. Second, the prediction error is encoded; the prediction error is the difference between the predicte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/593H04N19/159H04N19/186H04N19/176
CPCH04N19/593H04N19/103H04N19/159H04N19/44
Inventor J·莱内玛A·阿明洛
Owner NOKIA TECHNOLOGLES OY