CN107509075A - A kind of method of quick division CU for AVS2 Video codings - Google Patents

A kind of method of quick division CU for AVS2 Video codings Download PDF

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Publication number
CN107509075A
CN107509075A CN201710667562.5A CN201710667562A CN107509075A CN 107509075 A CN107509075 A CN 107509075A CN 201710667562 A CN201710667562 A CN 201710667562A CN 107509075 A CN107509075 A CN 107509075A
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cost
sub
coding
lcu
division
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叶锋
魏和文
张乐
赵宏宇
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Fujian Star-Net Wisdom Technology Co Ltd
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Fujian Star-Net Wisdom Technology Co Ltd
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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
    • H04N19/119—Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
    • 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
    • H04N19/103—Selection of coding mode or of prediction mode
    • 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
    • H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards
    • 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
    • H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
    • H04N19/96—Tree coding, e.g. quad-tree coding

Abstract

The present invention provides the method and system of quick division CU for AVS2 Video codings a kind of, which obviating one LCU of traditional quad-tree partition needs to travel through the problem of all partition mode CU efficiency are too low step by step, the Coding cost that this method is divided into sub- CU from single LCU with it is started with, for the CU (32 × 32 below LCU levels, 16 × 16) no longer by the way of quaternary tree divides step by step (8 × 8 CU without dividing again), but a LCU is divided into the sub- CU of 4 32 × 32, or it is divided into the sub- CU of 16 16 × 16, or the sub- CU of 64 8 × 8, division is terminated in advance using the Coding cost magnitude relationship of upper strata dividing mode and lower floor's dividing mode.This method can effectively lower the computation complexity of AVS2 video encoders on the premise of picture quality (quality, which slightly has, during low QP values is lifted) is ensured, improve code efficiency.

Description

A kind of method of quick division CU for AVS2 Video codings
【Technical field】
The present invention relates to AVS2 field of video encoding, more particularly to a kind of quick division CU's based on AVS2 Video codings Method.
【Background technology】
Along with the rapid development of scientific and technological progress, multimedia technology and computer technology, information processing is also faced with all More challenges, one of them is storage and the transmission problem of mass data.In the digital times of today, multimedia messages are As indispensable information resources in people's daily life.But ever-increasing information content for limited storaging medium, It is a problem urgently to be resolved hurrily for transmission bandwidth.Especially present user is to get over for the demand of high-definition digital video business Come higher, then solve the storage of HD video and transmission problem and also just seem significant.AVS2 video encoding standards push away Go out also is exactly to have complied with this tendency of the day and be conceived to solution high definition/ultra high-definition video compression coding and a series of deposit The problem of storage and transmission.
Such as conventional classical coding techniques H.264, AVS1, AVS2 Video codings employ classics mixing compile Code framework, as shown in Figure 1.AVS2 Video codings have also been introduced numerous new technologies on the basis of tradition, mainly include：More Flexible coding unit, CU shapes are not limited to traditional square, and CU size is greatly；More infra-frame prediction moulds Formula, more frame types etc..The use of these new technologies so that coded system is more flexible than ever, coding quality and effect It is more accurate, but this also brings some problems simultaneously, that is, encoder complexity is higher.
In standard AVS2 video coding process, it is necessary to be divided to CU, still before predict within the frame/frames CU many sizes, provide that CU has following several sizes available in AVS2 standards, be 64 × 64,32 × 32,16 respectively × 16、8×8.For how on earth divide a LCU (LCU is maximum coding unit, such as 64 × 64 pieces) the problem of, be attributed to as What picks out a kind of most reasonable manner from numerous dividing modes.Certainly, can carry out this precondition selected is, really It is more more reasonable than other dividing modes there is a kind of mode of division.In AVS2 canonical algorithms, selected most to realize This process of reasonable CU dividing modes, employs quaternary tree recurrence division CU mode, and which is as shown in Figure 2.It specific The process of realization is to travel through all possible partition mode step by step, describes this process with CU depth, can be attributed to " by depth To shallow " encode step by step, it is optimal dividing mode finally to pick out that minimum mode of Coding cost.However, it is possible to see Arrive, it is very time-consuming to have traveled through this method of all partition modes and implemented, therefore, it is necessary to it is further proposed that more added with The processing scheme of effect, the present invention just propose a kind of new quick division CU method for the part.
【The content of the invention】
One of the technical problem to be solved in the present invention, it is to provide a kind of quick division CU's based on AVS2 Video codings Method, this method solve one LCU of traditional quad-tree partition need to travel through all partition mode CU efficiency step by step it is too low Problem, and can reduce on the premise of encoded images mass conservation is ensured and travel through coding in AVS2 canonical algorithms step by step The complexity of CU processes, computational complexity is reduced, improve code efficiency.
The present invention is realized in one of above-mentioned technical problem：
A kind of method of quick division CU for AVS2 Video codings, its by the way of from shallow to deep, including：
A.1 a LCU, is encoded, i.e., the CU of one 64 × 64 is encoded, and the cost for recording coding is RD_cost_ 64×64；
A.2, the LCU is divided into the sub- CU of 4 32 × 32, and the sub- CU of described 4 32 × 32 is encoded, is remembered The cost of record coding is RD_cost_64 × 64；LCU is divided into the sub- CU of 4 32 × 32 can use quad-tree partition side Formula, but not in the sub- CU of the sub- CU and 8 × 8 using quaternary tree model split 16 × 16；
A.3 judgement, is performed：Determine whether current CU needs to continue to segment according to Coding cost magnitude relationship, if need not, CU subdivisions are then terminated in advance, it is specific as follows：
If RD_cost_64 × 64<RD_cost_32 × 32, then division is terminated, i.e., described LCU is without subdivided, directly Encode a LCU；
If RD_cost_64 × 64 >=RD_cost_32 × 32 are, it is necessary to further divide, execution step is A.4；
A.4, the LCU is divided into the sub- CU of 16 16 × 16, and the sub- CU of described 16 16 × 16 is encoded, The cost of record coding is RD_cost_16 × 16；
A.5 judgement, is performed：
If RD_cost_32 × 32<RD_cost_16 × 16, then division is terminated, using 4 32 × 32 sub- CU's of coding Mode；
If RD_cost_32 × 32 >=RD_cost_16 × 16 are, it is necessary to further divide, execution step is A.6；
A.6, the LCU is divided into the sub- CU of 64 8 × 8, and the sub- CU of described 64 8 × 8 is encoded, is recorded The cost of coding is RD_cost_8 × 8；
A.7 judgement, is performed：
If RD_cost_16 × 16<RD_cost_8 × 8, then division is terminated, using 16 16 × 16 sub- CU of coding side Formula；
If RD_cost_16 × 16 >=RD_cost_8 × 8, by the way of 64 8 × 8 sub- CU are encoded.
Further, it is described perform judge step A.3, A.5, A.7 in, two Coding costs to compare are equal When, it can also carry out termination division.
The second technical problem to be solved by the present invention, it is to provide a kind of quick division CU's based on AVS2 Video codings System.
The present invention is realized in the twos' of above-mentioned technical problem：
The system of quick division CU for AVS2 Video codings a kind of, including following module：
One coding module, for 1, CU, the i.e. LCU of coding 64 × 64, and the cost for recording coding is RD_cost_ 64×64；The 2nd, the LCU is divided into the sub- CU of 4 32 × 32, and it is encoded, record Coding cost be RD_cost_32 × 32；The 3rd, the LCU is divided into the sub- CU of 16 16 × 16, and it is encoded, record Coding cost is RD_cost_16 × 16； The 4th, the LCU is divided into the sub- CU of 64 8 × 8, and it is encoded, record Coding cost is RD_cost_8 × 8；
One determination module, perform following judgement：
(1) if, RD_cost_64 × 64<RD_cost_32 × 32, then terminate division, i.e., described LCU does not have to draw again Point, one LCU of direct coding；If RD_cost_64 × 64 >=RD_cost_32 × 32 are, it is necessary to further divide, by institute State coding module execution；
(2) if, RD_cost_32 × 32<RD_cost_16 × 16, then division is terminated, using 4 32 × 32 sons of coding CU mode；If RD_cost_32 × 32 >=RD_cost_16 × 16, it is necessary to further divide, are held by the coding module OK；
(3) if, RD_cost_16 × 16<RD_cost_8 × 8, then division is terminated, using 16 16 × 16 sons of coding CU mode；If RD_cost_16 × 16 >=RD_cost_8 × 8, by the way of 64 8 × 8 sub- CU are encoded.
The invention has the advantages that：
The present invention abandons 32 × 32,16 × 16 single CU of both sizes quaternary tree recurrence division, then uses straight The mode that a LCU is divided into more sub- CU is connect, than using the recursive mode letter step by step of quaternary tree mode in canonical algorithm It is single.
The present invention is divided into the CU of 4 32 × 32 from single LCU and single LCU, or is divided into 16 16 × 16 CU, or the CU of 64 8 × 8 start with, and according to the size of contrast adjacent two layers CU Coding costs, judge whether that needs will be current CU continues to be divided into smaller CU, terminates 8 × 8 sizes that CU is divided to the bottom in advance under many circumstances.
Present invention reduces the computational complexity of AVS2 Video codings, improves code efficiency.
【Brief description of the drawings】
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the basic framework of AVS2 Video codings in the prior art.
Fig. 2 is that quaternary tree recurrence divides CU schematic diagram and corresponding quad-tree structure in the prior art.
Fig. 3 does experiment for the present invention in RD14.0 and obtained on code check and picture quality (Y-PSNR：PSNR) Curve map, and the curve map of AVS2 officials default algorithm method, code check corresponds to QP values as 37,32,27,22 respectively in figure.
【Embodiment】
Embodiment one,
A kind of method of quick division CU for AVS2 Video codings, its by the way of from shallow to deep, including：
A.1 a LCU, is encoded, i.e., the CU of one 64 × 64 is encoded, and the cost for recording coding is RD_cost_ 64×64；
A.2, the LCU is divided into the sub- CU of 4 32 × 32, and the sub- CU of described 4 32 × 32 is encoded, is remembered The cost of record coding is RD_cost_64 × 64；
A.3 judgement, is performed：Determine whether current CU needs to continue to segment according to Coding cost magnitude relationship, if need not, CU subdivisions are then terminated in advance, it is specific as follows：
If RD_cost_64 × 64<RD_cost_32 × 32, then division is terminated, i.e., described LCU is without subdivided, directly Encode a LCU；
If RD_cost_64 × 64 >=RD_cost_32 × 32 are, it is necessary to further divide, execution step is A.4；
A.4, the LCU is divided into the sub- CU of 16 16 × 16, and the sub- CU of described 16 16 × 16 is encoded, The cost of record coding is RD_cost_16 × 16；
A.5 judgement, is performed：
If RD_cost_32 × 32<RD_cost_16 × 16, then division is terminated, using 4 32 × 32 sub- CU's of coding Mode；
If RD_cost_32 × 32 >=RD_cost_16 × 16 are, it is necessary to further divide, execution step is A.6；
A.6, the LCU is divided into the sub- CU of 64 8 × 8, and the sub- CU of described 64 8 × 8 is encoded, is recorded The cost of coding is RD_cost_8 × 8；
A.7 judgement, is performed：
If RD_cost_16 × 16<RD_cost_8 × 8, then division is terminated, using 16 16 × 16 sub- CU of coding side Formula；
If RD_cost_16 × 16 >=RD_cost_8 × 8, by the way of 64 8 × 8 sub- CU are encoded.
It is described perform judge step A.3, A.5, A.7 in, can also have another embodiment：Two compare Coding cost it is equal when, can also carry out termination division, for example, A.3, perform judgement：If RD_cost_64 × 64≤RD_ Cost_32 × 32, then terminate division, i.e., described LCU does not have to subdivided, one LCU of direct coding；
A.4 if ＞ RD_cost_32 × 32 of RD_cost_64 × 64, it is necessary to further divide, perform step；
It is implemented being advantageous in that and terminates division in advance, the time is saved, it is also possible to losing more preferably coded system.
Referring to Fig. 3, Video coding is tested using the quick division CU of present invention method,
Experimental situation and configuration are as follows：
Hardware condition：CPU--i5-4200 2.5GHz
Software environment：VS2013
Experiment condition：RD14.0, full I frames configuration, QP values are 32
Table 1 is the effect that test obtains.
In table 1, AVS2 represents the result measured using the AVS2 algorithms of standard, and Algorithm represents to use CU of the present invention The result that division methods measure.From this table it can be seen that using the CU division methods of the present invention, before picture quality is ensured (from figure 3, it can be seen that two curves are almost overlapping) is put, reduces for 35% or so scramble time, effectively reduces The computation complexity of encoder.
The present invention proposes a kind of quick division CU method for AVS2 Video codings, and this method is from single LCU and it The Coding cost for being divided into sub- CU is started with, and is no longer drawn step by step using quaternary tree for the CU (32 × 32,16 × 16) below LCU levels The mode (8 × 8 CU without divide again) divided, but a LCU is divided into the CU of 4 32 × 32, or it is divided into 16 16 × 16 CU, or the CU of 64 8 × 8, the Coding cost magnitude relationship using upper strata dividing mode and lower floor's dividing mode are entered Row terminates division in advance.This method can effectively subtract on the premise of picture quality (quality is slightly lifted during low QP values) is ensured The computation complexity of low AVS2 video encoders, improve code efficiency.
Embodiment two,
The system of quick division CU for AVS2 Video codings a kind of, including following module：
One coding module, for 1, CU, the i.e. LCU of coding 64 × 64, and the cost for recording coding is RD_cost_ 64×64；The 2nd, the LCU is divided into the sub- CU of 4 32 × 32, and it is encoded, record Coding cost be RD_cost_32 × 32；The 3rd, the LCU is divided into the sub- CU of 16 16 × 16, and it is encoded, record Coding cost is RD_cost_16 × 16； The 4th, the LCU is divided into the sub- CU of 64 8 × 8, and it is encoded, record Coding cost is RD_cost_8 × 8；
One determination module, perform following judgement：
(1) if, RD_cost_64 × 64<RD_cost_32 × 32, then terminate division, i.e., described LCU does not have to draw again Point, one LCU of direct coding；If RD_cost_64 × 64 >=RD_cost_32 × 32 are, it is necessary to further divide, by institute State coding module execution；
(2) if, RD_cost_32 × 32<RD_cost_16 × 16, then division is terminated, using 4 32 × 32 sons of coding CU mode；If RD_cost_32 × 32 >=RD_cost_16 × 16, it is necessary to further divide, are held by the coding module OK；
(3) if, RD_cost_16 × 16<RD_cost_8 × 8, then division is terminated, using 16 16 × 16 sons of coding CU mode；If RD_cost_16 × 16 >=RD_cost_8 × 8, by the way of 64 8 × 8 sub- CU are encoded.
The system of quick division CU for AVS2 Video codings a kind of, it performs method and compiled with a kind of AVS2 videos that are used for The quick division CU of code method is identical.
The beneficial effect of the system is identical with method, and the Coding cost using upper strata dividing mode and lower floor's dividing mode is big Small relation is terminated division in advance.This method can on the premise of picture quality (quality is slightly lifted during low QP values) is ensured The effective computation complexity for lowering AVS2 video encoders, improves code efficiency.
Although the foregoing describing the embodiment of the present invention, those familiar with the art should manage Solution, the specific embodiment described by us are merely exemplary, rather than for the restriction to the scope of the present invention, are familiar with this The equivalent modification and change that the technical staff in field is made in the spirit according to the present invention, should all cover the present invention's In scope of the claimed protection.

Claims (3)

  1. A kind of 1. method of quick division CU for AVS2 Video codings, it is characterised in that its by the way of from shallow to deep, Including：
    A.1, encode a LCU, i.e., the CU of one 64 × 64 encoded, and record the cost of coding for RD_cost_64 × 64；
    A.2, the LCU is divided into the sub- CU of 4 32 × 32, and the sub- CU of described 4 32 × 32 is encoded, record is compiled The cost of code is RD_cost_32 × 32；
    A.3 judgement, is performed：Determine whether current CU needs to continue to segment according to Coding cost magnitude relationship, if need not, carry Preceding termination CU subdivisions, it is specific as follows：
    If RD_cost_64 × 64<RD_cost_32 × 32, then terminate division, i.e., described LCU does not have to subdivided, direct coding One LCU；
    If RD_cost_64 × 64 >=RD_cost_32 × 32 are, it is necessary to further divide, execution step is A.4；
    A.4, the LCU is divided into the sub- CU of 16 16 × 16, and the sub- CU of described 16 16 × 16 is encoded, is recorded The cost of coding is RD_cost_16 × 16；
    A.5 judgement, is performed：
    If RD_cost_32 × 32<RD_cost_16 × 16, then division is terminated, by the way of 4 32 × 32 sub- CU are encoded；
    If RD_cost_32 × 32 >=RD_cost_16 × 16 are, it is necessary to further divide, execution step is A.6；
    A.6, the LCU is divided into the sub- CU of 64 8 × 8, and the sub- CU of described 64 8 × 8 is encoded, record coding Cost be RD_cost_8 × 8；
    A.7 judgement, is performed：
    If RD_cost_16 × 16<RD_cost_8 × 8, then division is terminated, by the way of 16 16 × 16 sub- CU are encoded；
    If RD_cost_16 × 16 >=RD_cost_8 × 8, by the way of 64 8 × 8 sub- CU are encoded.
  2. A kind of 2. quick division CU for AVS2 Video codings as claimed in claim 1 method, it is characterised in that：Institute State perform judge step A.3, A.5, A.7 in, when two Coding costs to compare are equal, can also carry out termination division.
  3. 3. a kind of quick division CU for AVS2 Video codings system, it is characterised in that including following module：
    One coding module, for 1, encode 64 × 64 CU, i.e. a LCU, and record the cost of coding for RD_cost_64 × 64；The 2nd, the LCU is divided into the sub- CU of 4 32 × 32, and it is encoded, record Coding cost is RD_cost_32 × 32； The 3rd, the LCU is divided into the sub- CU of 16 16 × 16, and it is encoded, record Coding cost is RD_cost_16 × 16；4、 The LCU is divided into the sub- CU of 64 8 × 8, and it is encoded, record Coding cost is RD_cost_8 × 8；
    One determination module, perform following judgement：
    (1) if, RD_cost_64 × 64<RD_cost_32 × 32, then division is terminated, i.e., described LCU is without subdivided, directly Meet one LCU of coding；If RD_cost_64 × 64 >=RD_cost_32 × 32 are, it is necessary to further divide, by the volume Code module performs；
    (2) if, RD_cost_32 × 32<RD_cost_16 × 16, then division is terminated, using 4 32 × 32 sub- CU's of coding Mode；If RD_cost_32 × 32 >=RD_cost_16 × 16, it is necessary to further divide, are performed by the coding module；
    (3) if, RD_cost_16 × 16<RD_cost_8 × 8, then division is terminated, using 16 16 × 16 sub- CU's of coding Mode；If RD_cost_16 × 16 >=RD_cost_8 × 8, by the way of 64 8 × 8 sub- CU are encoded.
CN201710667562.5A 2017-08-07 2017-08-07 A kind of method of quick division CU for AVS2 Video codings Pending CN107509075A (en)

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