US 11,451,799 B2Granted

Transmission bit-rate control in a video encoder

AssigneeTexas Instruments Incorporated

InventorsSoyeb Nagori, Naveen Srinivasamurthy, Anurag Jain

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Abstract

A video encoder receives a minimum number of bits (MIN) and a maximum number of bits (MAX) to be used to encode a segment of a sequence of image frames, the segment including a set of pictures contained in the sequence of image frames. The video encoder encodes the set of pictures using a total number of bits greater than the minimum number of bits (MIN), and not exceeding the maximum number of bits (MAX). Thus, the transmission bit-rate of the video encoder can be constrained to lie within a maximum and minimum rate. In an embodiment, the constraints are enforced over relatively short time intervals.

Claims8

Dependent claims

A method comprising:

obtaining a number of bits for encoding a sequence of image frames, the sequence including a set of pictures included in the sequence of image frames;
determining a base quantization scale for a picture in the set of pictures based on a target average bit rate;
determining an average quantization scale value as an average of a plurality of quantization values used for encoding pictures in the set of pictures;
determining a minimum quantization scale for the picture using:
(a) the average quantization scale value, (b) a first number of previously encoded pictures, and (c) the number of bits;
determining a quantization scale for encoding the picture based on a comparison to determine a maximum between (A) the base quantization scale and (B) the minimum quantization scale;
and
encoding the picture using the quantization scale.

5 more elements

An encoder comprising one or more processors, the one or more processors configured to:

obtain a number of bits for encoding a sequence of image frames, the sequence including a set of pictures;
and
determine a base quantization scale for a picture in the set of pictures based on a target average bit rate;
determine an average quantization scale value as an average of a plurality of quantization values used for encoding pictures in the set of pictures;
determine a minimum quantization scale for the picture based on:
(a) the average quantization scale value, (b) a first number of previously encoded pictures, and (c) the number of bits;
determine a quantization scale for encoding the picture based on a comparison to determine a maximum between (A) the base quantization scale and (B) the minimum quantization scale;
and
encode the set of pictures using the quantization scale.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/934,274Filed 21 Jul 2020 · continuation
Priority: IN 2715/CHE/20096 Nov 2009
Published: US 2020/0351508 A15 Nov 2020
Granted: 20 Sep 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

H04N 19/184
Characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the…: the…
H04N 19/124
Characterised by the element, parameter or selection affected or controlled by the adaptive coding: quantisation
H04N 19/146
Characterised by the element, parameter or criterion affecting or controlling the adaptive coding: data rate or code amount at the encoder output
H04N 19/149
Data rate or code amount at the encoder output: by estimating the code amount by means of a model, e.g. mathematical model or statistical model

Family

Application12/938,397Parent of this continuation · filed 3 Nov 2010
Application14/934,145Parent of this continuation · filed 5 Nov 2015
US 2020/0351508 A1Pre-grant publication · published 5 Nov 2020
US 10,764,591 B2Parent of this continuation
US 2011/0110422 A1Published application
US 2016/0191924 A1Published application
US 11,451,799 B2This patent

From the US filing history. Foreign family members aren’t listed.

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