CN107071417A - A kind of intra-frame prediction method for Video coding - Google Patents

A kind of intra-frame prediction method for Video coding Download PDF

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CN107071417A
CN107071417A CN201710228419.6A CN201710228419A CN107071417A CN 107071417 A CN107071417 A CN 107071417A CN 201710228419 A CN201710228419 A CN 201710228419A CN 107071417 A CN107071417 A CN 107071417A
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predicted
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CN107071417B (en
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朱策
毛敏
刘宇洋
宋世昶
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University of Electronic Science and Technology of China
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/117—Filters, e.g. for pre-processing or post-processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • H04N19/126—Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
    • H04N19/159—Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/167—Position within a video image, e.g. region of interest [ROI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding 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 adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding 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 adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding 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 adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/80—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation

Abstract

The invention belongs to technical field of video coding, a kind of intra-frame prediction method for Video coding is particularly related to.The method of the present invention includes：Predicted value is generated using the unfiltered reference pixel generation filtered reference pixel of multiple lines and multiple rows, using filtered reference pixel, smoothly generate new predicted value using the unfiltered reference pixel of multiple lines and multiple rows and predicted value.Beneficial effects of the present invention are, relatively existing PDPC technologies, the present invention can more efficiently, robustly carry out intraframe coding.

Description

A kind of intra-frame prediction method for Video coding
Technical field
The invention belongs to technical field of video coding, a kind of infra-frame prediction side for Video coding is particularly related to Method.
Background technology
In recent years, colourful video content is all being produced all the time, and number of videos is even more exponentially level explosion type Increase.Counted according to YouTube, the amount of video of user's upload per minute was up to more than 300 hours；AT＆T Labs's prediction, the year two thousand twenty sound Video data flow will account for the 80% of new flow increasing, there is some evidence, video data turns into the big data in big data, I Be in the multimedia era surrounded by magnanimity audio, video data.In order to save memory space reduction transmission band occupation rate, Generally require and do video compression coding processing.
Intraframe coding is a kind of coded system in video encoding standard.The reference pixel of traditional intraframe coding merely with Apart from the row pixel of a line one of the nearest reconstructed block of current block to be encoded, by selecting a kind of prediction angle mode to carry out linear prediction Obtain.
The single-row Forecasting Methodology of this utilization single file has been proved to be very effective to small size encoding block, but this Kind of method is to the effect of large scale encoding block and bad, and the position of current block to be encoded is different, the prediction that encoder needs Pixel filter strategy is also not quite similar.For example, more low intensive smooth relative to being needed away from the upper left pixel of block to be encoded. In addition, even for the block of formed objects, because encoding block content is different, encoder needs different filtering strategies.
In the past period, researchers are proposed using recursion filter smoothing prediction value, and experiment proof can be with Improve code efficiency.
W.-J.Han and J.Min (" Improved video compression efficiency through flexible unit representation and corresponding extension of coding tools,” IEEE Trans.Circuits Syst.Video Technol.,vol.20,no.12,pp.1709–1720,Dec.2010.) And Y.Chen and J.Han, (" A recursive extrapolation approach to intra prediction in video coding,”in Proc.IEEE Int.Conf.Acoustics Speech Signal Process., Vancouver, BC, Canada, May 2013, pp.1734-1738.), it is to carry out smoothing prediction value using recursion filter group.Though Right recursive method can be carried out smoothly to prediction pixel to a certain extent, and test result indicates that recursion filter can be carried Coding efficiency is risen, however, recursion filter is not particularly suited for parallel computation, and the overall change of signal is not considered.
The content of the invention
In order to preferably utilize block to be encoded inner vein feature, the present invention propose a kind of position based on multiple lines and multiple rows according to Rely intra-frame prediction method (the Enhanced Position dependent intra prediction of prediction combination combination,EPDPC)。
The technical scheme is that：
A kind of intra-frame prediction method for Video coding, it is characterised in that comprise the following steps：
S1, generation filtered reference pixel：
Filtered reference pixel S is obtained by equation below 1：
S=Ak·R+(E-Ak)·(Hk* R) (formula 1)
In formula 1, HkFilter parameter under the coding block size, R is the multiple lines and multiple rows for the current block to be encoded chosen Reference pixel, * is convolution operator, AkThe weighted factor exported for wave filter；
S2, the predicted pixel values for calculating present encoding block：
Coding block size is set as M × N, to the prediction pixel P of each pixel (x, y) in encoding blockx,yCarry out pre- Survey, wherein, N >=x >=1, M >=y >=1；Assuming that Sx,0With S0,yIt is most to lean in the filtered reference pixel S of current block to be encoded respectively The row pixel of a line one of nearly current block to be encoded, then the generation method of predicted pixel values include：
Under plane (Planar) predictive mode：
By prediction pixel Px,yLevel, the average value of vertical both direction predicted value are defined as, then passes through equation below 2, public affairs Formula 3 and formula 4 obtain predicted pixel values：
Under DC component (DC) predictive mode：
Luminance component for chromatic component and more than 16x16, predicted pixel values are obtained by equation below 5：
Other situations are then obtained by equation below 6：
Under angle mode：
For giving vertical class angle mode M, the reference pixel used is needed to be mapped as shape using projected pixel method Formula, is designated as Ref, equation below 7 and formula 8：
Position of the current pixel correspondence reference pixel in is calculated, pos, equation below 9 is designated as：
Pos=(yoffset [M])>>5 (formula 9)
Calculate the weighted factor w of current pixel correspondence reference pixel, equation below 10：
W=(yoffset [M]) ＆31 (formula 10)
The predicted pixel values of current pixel are calculated by equation below 11：
Px,y=((32-w) Ref [pos]+wRef [pos+1]+16)>>5 (formula 11)
Wherein, offset [M] is angle commutation factor, and Round () is the operation function that rounds up；
S3, new predicted value smoothly generated according to the unfiltered reference pixel of multiple lines and multiple rows and predicted value：
According to the predicted value P obtained in step S2x,y, obtain final current to be encoded by equation below 12- formula 16 The predicted pixel values of block：
Wherein,It is the Prediction Parameters of storage, for 16 × 16 block, d=1 is set, for bigger Block, set d=2；bx,yIt is normalization factor, equation below 16：
It is to be to rely on horizontal level, the weighting weight of upright position respectively,It is one group and is directed to upper left corner position The weighting weight put,Dependent on horizontal level, upright position, upper left position convolution mask,It is downward Rounding operation is accorded with,>>Left shift operator.
The total technical scheme of this law, according to prediction angle mode, coded block size and the location of pixels of encoding block, using many The unfiltered reference pixel of row multiple row predicts the predicted value of current block to be encoded, and with after obtained predicted value and filtering (smooth) The unfiltered reference pixel weighted array of multiple lines and multiple rows obtains final predicted value.Realize efficiently intraframe coding.
The beneficial effects of the invention are as follows：Compared with the prior art, the present invention can more efficiently, robustly carry out frame in volume Code.
Brief description of the drawings
Fig. 1 is two rows two row EPDPC schematic diagrames in the present invention, wherein (a) current block to be encoded and unfiltered reference image Plain schematic diagram, (b) is current block to be encoded and filtered reference pixel schematic diagram；
Fig. 2 is frame in angle mode prediction direction schematic diagram, and each of which arrow represents a prediction direction.
Embodiment
With reference to the accompanying drawings and examples, technical scheme is described in detail：
Embodiment
This example is the validity that the EPDPC arranged with two rows two verifies the method for the invention.
The method of this example includes：
A plan Gaussian filter is built using formula (1), upper unfiltered two row two of current block to be encoded is arranged into ginseng Examine pixel Unfiltered Refline2 and Unfiltered Refline1 filtering (Fig. 1 (a)) generation (Fig. 1 (b)) filtering Reference pixel Filtered Refline1：
S=Ak·R+(E-Ak)·(Hk* R) (formula 1)
Step 2, according to angle mode in Fig. 2, calculate current compile with filtered reference pixel Filtered Refline1 Prediction pixel Prediction (the P of code block pixel (x, y)x,y)；
Step 3, with Unfiltered Refline2 and Unfiltered Refline1 and PredictionP (x, y) Filtering generation FPrediction (FPx,y).P is obtained by the method for step 2x,yAfterwards, b is calculated according to formula (16)x,y：
Then the predicted pixel values FP of final current block is calculated using formula (15)x,y：
Parameter in formula (15) can utilize formula (12), and formula (13) and formula (14) are even if obtain；Wherein, for 16 × 16 block, sets d=1, for bigger block, sets d=2；And set It is one group of convolution mask.
Table 3 is the coding result that embodiment is obtained：
The coding result that the embodiment of table 3 is obtained
Sequence Y U V
Traffic - 0.1% 0.0% 0.0%
PeopleOnStreet - 0.2% - 0.3% - 0.2%
Nebuta - 0.2% - 0.4% - 0.2%
SteamLocomotive - 0.2% - 0.8% - 0.1%
ParkScene - 0.2% - 0.1% - 0.1%
Cactus - 0.1% - 0.1% - 0.2%
BasketballPass - 0.1% - 0.1% - 0.4%
BQSquare - 0.1% 0.1% - 0.1%
BlowingBubbles - 0.1% - 0.2% - 0.1%
RaceHorses - 0.1% - 0.2% - 0.1%
FourPeople - 0.2% - 0.2% - 0.3%
Johnny - 0.1% - 0.1% - 0.1%
KristenAndSara - 0.1% 0.0% 0.0%
SlideShow - 0.2% - 0.2% - 0.6%
(average) Average - 0.1% - 0.2% - 0.2%
It can be drawn from the coding efficiency shown in table 3, the encoding efficiency of tri- components of YUV is improved.

Claims (1)

1. a kind of intra-frame prediction method for Video coding, it is characterised in that comprise the following steps：
S1, generation filtered reference pixel：
Filtered reference pixel S is obtained by equation below 1：
S=Ak·R+(E-Ak)·(Hk* R) (formula 1)
In formula 1, HkFilter parameter under the coding block size, R is the multiple lines and multiple rows reference image for the current block to be encoded chosen Element, * is convolution operator, AkThe weighted factor exported for wave filter；
S2, the predicted pixel values for calculating present encoding block：
Coding block size is set as M × N, to the prediction pixel P of each pixel (x, y) in encoding blockx,yIt is predicted, Wherein, N >=x >=1, M >=y >=1；Assuming that Sx,0With S0,yBe respectively in the filtered reference pixel S of current block to be encoded near The row pixel of a line one of current block to be encoded, then the generation method of predicted pixel values include：
Under plane prediction mode：
By prediction pixel Px,yLevel, the average value of vertical both direction predicted value are defined as, then passes through equation below 2, formula 3 Predicted pixel values are obtained with formula 4：
Under DC component predictive mode：
Luminance component for chromatic component and more than 16x16, predicted pixel values are obtained by equation below 5：
Other situations are then obtained by equation below 6：
Under angle mode：
For giving vertical class angle mode M, needed the reference pixel used to be mapped as form using projected pixel method, remembered For Ref, equation below 7 and formula 8：
Position of the current pixel correspondence reference pixel in is calculated, pos, equation below 9 is designated as：
Pos=(yoffset [M])>>5 (formula 9)
Calculate the weighted factor w of current pixel correspondence reference pixel, equation below 10：
W=(yoffset [M]) ＆31 (formula 10)
The predicted pixel values of current pixel are calculated by equation below 11：
Px,y=((32-w) Ref [pos]+wRef [pos+1]+16)>>5 (formula 11)
Wherein, offset [M] is angle commutation factor, and Round () is the operation function that rounds up；
S3, new predicted value smoothly generated according to the unfiltered reference pixel of multiple lines and multiple rows and predicted value：
According to the predicted value P obtained in step S2x,y, final current block to be encoded is obtained by equation below 12- formula 16 Predicted pixel values：
Wherein,It is the Prediction Parameters of storage, for 16 × 16 block, d=1 is set, for bigger Block, sets d=2；bx,yIt is normalization factor, equation below 16：
It is to be to rely on horizontal level, the weighting weight of upright position respectively,It is one group and is directed to upper left position Weight weight,Dependent on horizontal level, upright position, upper left position convolution mask,It is to round downwards Operator,>>Left shift operator.
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CN112889286A (en) * 2018-12-21 2021-06-01 华为技术有限公司 Method and apparatus for mode-dependent and size-dependent block-level limiting of position-dependent prediction combinations
CN116567207A (en) * 2018-12-29 2023-08-08 华为技术有限公司 Method and apparatus for intra prediction
CN116567207B (en) * 2018-12-29 2024-02-13 华为技术有限公司 Method and apparatus for intra prediction
WO2020258001A1 (en) * 2019-06-25 2020-12-30 Oppo广东移动通信有限公司 Luminance component prediction method, encoder, decoder and storage medium
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WO2020258010A1 (en) * 2019-06-25 2020-12-30 Oppo广东移动通信有限公司 Image encoding method, image decoding method, encoder, decoder and storage medium
RU2790323C2 (en) * 2019-06-25 2023-02-16 Гуандун Оппо Мобайл Телекоммьюникейшнс Корп., Лтд. Image encoding method, image decoding method, encoder, decoder and data carrier
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CN111787334A (en) * 2020-05-29 2020-10-16 浙江大华技术股份有限公司 Filtering method, filter and device for intra-frame prediction
CN114363632A (en) * 2021-12-10 2022-04-15 浙江大华技术股份有限公司 Intra-frame prediction method, encoding and decoding method, encoder and decoder, system, electronic device and storage medium

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