CN103796023B - H.265/HEVC transcoding method and transcoder based on H.264/AVC macro block structure and texture - Google Patents
H.265/HEVC transcoding method and transcoder based on H.264/AVC macro block structure and texture Download PDFInfo
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- CN103796023B CN103796023B CN201410077616.9A CN201410077616A CN103796023B CN 103796023 B CN103796023 B CN 103796023B CN 201410077616 A CN201410077616 A CN 201410077616A CN 103796023 B CN103796023 B CN 103796023B
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Abstract
The invention relates to an H.264/AVC to H.265/HEVC transcoding method and transcoder based on an H.264/AVC macro block structure and texture. The method includes the steps of extracting inter-frame macro block division mode information in a code stream of H.264/AVC standard codes, combining every four 16*16 H.264/AVC macro blocks to form one 32*32 large macro block, judging whether four division modes of the four 16*16 H.264/AVC macro blocks in each 32*32 large macro block are all 16*16 division modes or not, if not, mapping the macro block division modes to an H.265/HEVC coding mode in a direct mapping mode, if yes, judging other modes of each 32*32 large macro block through a mode judging method based on texture, enabling the division mode selected through judgment to serve as the macro block division mode for H.265/HEVC codes, and coding the code stream of the H.265/HEVC codes according to the macro block division modes of the H.265/HEVC codes. By means of the H.264/AVC to H.265/HEVC transcoding method and transcoder based on the H.264/AVC macro block structure and texture, by selecting and using the macro block division mode information in the code stream of H.264/AVC codes, the transcoding speed is increased, and the coding effect is improved.
Description
Technical field
The present invention relates to the transcoding of video data, in particular to a kind of based on h.264/avc macroblock structure and texture
H.265/hevc code-transferring method and transcoder, for being h.265/hevc standard by the video data transcoding of h.264/avc standard
Video data.
Background technology
The popularization of HD video and the appearance of ultra high-definition video, have promoted the development of video coding and decoding technology, mpeg energetically
It is organized in 2013 with the itu Liang great world and has formally issued h.265/hevc new-generation digital video encoding and decoding standard, to adapt to
Network transmission and the development of high-quality video application.H.265/hevc it is the extension further in h.264/avc technical foundation
And expansion, since 2010 beginning draft collections, by countries in the world hundreds expert's R ＆ D Cooperation, until 2013 by two big countries
Border normal structure itu and mpeg announce to external world and formally become video encoding and decoding standard of future generation, last 3 years, therebetween through excessive
Secondary modification and perfect.
Video code conversion is that compressed video data is processed end to end, and the input/output of transcoder is all compressed data,
Compressed bit stream after transcoding is suitable for the requirement of transmission bandwidth and receiving terminal.In traditional tandem type pixel domain code conversion device
In (cascade pixel domain transcoder, cpdt), decoder and encoder are separate, use such transcoder
Carry out transcoding from h.264/avc standard to h.265/hevc standard when, first decode h.264 video flowing, then recompile, finally
It is compressed into h.265/hevc video code flow.
H.264/avc the method adopting macroblock partition and sub-split in interframe encode, each macro block can by 16 × 16,
16 × 8,8 × 16,8 × 8 four kinds of Fractionation regimen segmentations, moreover it is possible to be further divided into 8 × 4,4 in 8 × 8 macro-block partition modes
× 8,4 × 4 three kinds of Fractionation regimen segmentations.
And in h.265/hevc, the size of macro block be extend to 64x64 from 16x16 h.264/avc, in order to height
The compression of resolution video.Meanwhile, employ more flexible coding structure to improve code efficiency, including coding unit
(coding unit), predicting unit (predict unit) and converter unit (transform unit).
Wherein coding unit similar to the concept of the macro block in h.264/avc, for the process of coding, predicting unit be into
The elementary cell of row prediction, converter unit is by the elementary cell of transform and quantization.The separation of these three units is so that become
Change, predict and encode that each processing links is more flexible, the division being also beneficial to each link more conforms to the texture of video image
Feature, be conducive to unit more optimization completes respective function.
Each predicting unit corresponds to a motion vector, in encoding-decoding process, encoder to each motion vector and
The Fractionation regimen of corresponding predicting unit is encoded, and decoder is believed according to the Fractionation regimen of each predicting unit and motion vector
Breath is decoded.Need when h.265/hevc encoding first the Fractionation regimen of each predicting unit to be scanned for, and lost with rate
True majorized function calculation code cost, finally compares result of calculation, selects the prediction as interframe encode for the pattern of Least-cost
Unit Fractionation regimen, therefore, in existing transcoding process, due to not added using the effective information in h.264/avc code stream
Fast h.265/hevc cataloged procedure, therefore transcoding process is computationally intensive, and transcoding efficiency is restricted.
Content of the invention
Present invention aim to overcome that above-mentioned the deficiencies in the prior art and provide a kind of based on h.264/avc macroblock structure and
H.265/hevc the code-transferring method of texture and transcoder, the method is by the segmentation of macro block in Selection utilization h.264/avc code stream
Pattern information, accelerates the speed of transcoding, improves the effect of coding.
Realize the object of the invention the technical scheme is that a kind of based on h.264/avc macroblock structure and texture
H.265/hevc code-transferring method, the method includes:
Extract with the inter macroblocks Fractionation regimen information in the code stream of h.264/avc standard code；
H.264/avc 4 16x16 macro blocks are combined as a big macro block meeting h.265/hevc Fractionation regimen；
Judge whether 4 Fractionation regimen of 4 16x16 macro blocks in each big macro block are split for 16x16, if not, then
Using directly map by the way of using described macroblock partition mode map in h.265/hevc coding mode as h.265/hevc
The macroblock partition pattern of coding；If so, then with the pattern discrimination method based on texture, to 32x32, big macro block carries out other patterns and carries out
Judge, using the Fractionation regimen judging selection as the macroblock partition pattern h.265/hevc encoding；
H.265/hevc code stream coding is carried out according to the described macroblock partition pattern h.265/hevc encoding.
Present invention also offers a kind of h.265/hevc transcoder based on h.264/avc macroblock structure and texture, this turn
Code device includes:
Information extraction modules, extract with the inter macroblocks Fractionation regimen information in the code stream of h.264/avc standard code；
H.265/hevc, macro block composite module, divides for 4 16x16 macro blocks h.264/avc being combined as one meeting
Cut the big macro block of pattern；
Whether macroblock partition mode decision module, judge 4 Fractionation regimen of 4 16x16 macro blocks in each big macro block
Be all 16x16 segmentation, if not, then by the way of direct mapping by described macroblock partition mode map to h.265/hevc encoding
As the macroblock partition pattern h.265/hevc encoding in pattern；If so, then big to 32x32 with the pattern discrimination method based on texture
Macro block carries out other patterns and is judged, using the Fractionation regimen judging selection as the macroblock partition mould h.265/hevc encoding
Formula；
H.265/hevc h.265/ encoder, for carrying out according to the described macroblock partition pattern h.265/hevc encoding
Hevc code stream encodes.
The process that the present invention is the h.265/hevc video data of standard in the video data transcoding to h.264/avc standard
In, make use of the macroblock partition information in h.264/avc code stream, will h.264/avc in code stream 4 not all divide for 16x16
Cut the 16x16 macro block of pattern segmentation information map directly to h.265/hevc coding in, this operation decreases amount of calculation.This
Outward moreover it is possible to quickly determine to the segmentation information of the 16x16 macro block of 4 in h.264/avc code stream all 16x16 Fractionation regimen
Fractionation regimen, reduces computational complexity, thus ensure that high-quality encoding efficiency.
Brief description
Fig. 1 is the present invention in the structured flowchart of h.264/avc macroblock structure and the h.265/hevc transcoder of texture.
Fig. 2 is the flow chart based on h.264/avc macroblock structure and the h.265/hevc code-transferring method of texture for the present invention.
Specific embodiment
With specific embodiment, the present invention is described in further detail below in conjunction with the accompanying drawings.
As shown in figure 1, information retrieval mould is included based on the h.265/hevc transcoder of h.264/avc macroblock structure and texture
Block, macro block composite module, macroblock partition mode decision module, the mode decision selecting module based on texture and h.265/hevc compile
Code device.
Above-mentioned h.265/hevc transcoder realizes the video data transcoding to h.264/avc standard for h.265/hevc standard
Video data process as shown in Fig. 2 specifically including following steps:
S100, information extraction modules carry out information retrieval to the code stream inputting h.264/avc normal video data therein,
Extract the inter macroblocks Fractionation regimen information in code stream.
H.264/avc 4 16x16 macro blocks are combined as one and meet h.265/hevc dividing by s200, macro block composite module
Cut the big macro block of pattern.The present embodiment is carried out so that 4 16x16 macro blocks h.264/avc are combined as the big macro block of 32x32 in detail
Describe in detail bright.
S300, macroblock partition mode decision module judge to the inter macroblocks Fractionation regimen information extracted.Judge every
Whether 4 Fractionation regimen of 4 16x16 macro blocks in the big macro block of individual 32x32 are all 16x16 segmentation, if not, then using directly reflecting
The mode penetrated is by described macroblock partition mode map in h.265/hevc coding mode；If so, then with the pattern based on texture
To 32x32, big macro block carries out other patterns and judges diagnostic method, using the Fractionation regimen judging selection as h.265/hevc compiling
The macroblock partition pattern of code.
In the present embodiment, carry out judging to select to include following two steps based on the mode decision selecting module of texture:
S301, corresponding Fractionation regimen is selected according to grain details degree α of macro block.
First, calculate grain details degree α of m × n macro block according to the following formula,
Wherein,
In above formula, the gross energy of the AC compounent coefficient of e spatial domain, emax is maximum ac coefficient gross energy, f(x,
Y) represent that the component in spatial domain position (x, y) for certain predicting unit, fmax (x, y) and fmin (x, y) are respectively f (x, y)
Big value and minima.
α span is [0,1], and grain details degree is higher, and e more levels off to emax, thus α more levels off to 1.So,
May determine that the level of detail of macro block according to the value of α.In the present invention, as α > t1 when it is believed that macro block has very high details, right
Fractionation regimen in this block selection of small；When α is < it is believed that macro block details is not enriched during t2, using bigger Fractionation regimen；When t2 <
α < it is believed that macro block has higher details during t1, for this block adopt predicting unit Fractionation regimen between the above two.Wherein
T1 and t2 is empirical parameter set in advance, such as t1=0.9, t2=0.4 or other values, t1 and t2 can be according to different Fractionation regimen
The data statisticss of lower macro block level of detail and obtain.Some patterns are excluded in advance by this step, it is to avoid all patterns are all entered
Line search, reduces computation complexity.
S302, when t2 < α is < during t1, according to the corresponding Fractionation regimen of feature selection of macroblock level and vertical direction.
Due to 2n × n, 2n × nu, 2n × nd model comparision be suitable for the obvious region of horizontal texture, and n × 2n, nl × 2n,
Nr × 2n is compared with the obvious region of suitable vertical texture.Therefore, the difference of this step difference calculated level and vertical adjacent pixels is put down
Fang He, when horizontal adjacent pixels squared difference and more than vertically adjacent pixel quadratic sum when, from 2n × n, 2n ×
Nu or 2n × nd, otherwise selects n × 2n, nl × 2n or nr × 2n.
S400, h.265/hevc encoder carry out h.265/hevc code stream according to the macroblock partition pattern that above-mentioned steps obtain
Coding.
Claims (6)
1. a kind of h.264/avc h.265/hevc code-transferring method is arrived based on h.264/avc macroblock structure and texture, its feature exists
In, comprising:
Extract with the inter macroblocks Fractionation regimen information in the code stream of h.264/avc standard code；
H.264/avc 4 16x16 macro blocks are combined as a big macro block of 32x32 meeting h.265/hevc Fractionation regimen；
Judge whether 4 Fractionation regimen of 4 16x16 macro blocks in each big macro block are split for 16x16, if not, then adopt
Directly the mode of mapping using described macroblock partition mode map in h.265/hevc coding mode as h.265/hevc encoding
Macroblock partition pattern；If so, then with the pattern discrimination method based on texture, to 32x32, big macro block carries out other patterns and sentences
Fixed, using the Fractionation regimen judging selection as the macroblock partition pattern h.265/hevc encoding；Described with the segmentation based on texture
Pattern discrimination method carries out to other patterns judging to include:
Calculate m × n macro block grain details degree α, as α > t1 when, from the Fractionation regimen of 2nx2n；When α is < during t2, using nxn
Fractionation regimen；When t2 < α < during t1, the predicting unit Fractionation regimen of employing is 2n × n, 2n × nu, 2n × nd, n × 2n, nl ×
The Fractionation regimen of 2n or nr × 2n, wherein t1 and t2 are empirical parameter set in advance.
Described grain details degree α calculates according to the following formula:
Wherein,
In above formula, f (x, y) represents the component in spatial domain position (x, y) for certain predicting unit, fmax(x, y) and fmin(x, y) difference
Maximum for f (x, y) and minima；
H.265/hevc encoded according to the described macroblock partition pattern h.265/hevc encoding.
2. the h.265/hevc coded method based on h.264/avc macroblock structure and texture according to claim 1, its feature
Be: when t2 < α < during t1, respectively calculate m × n macro block the squared difference of horizontal and vertical neighbor and, when horizontally adjacent
The squared difference of pixel and more than vertically adjacent pixel quadratic sum when, from 2n × n, 2n × nu or 2n × nd, no
Then select n × 2n, nl × 2n or nr × 2n.
3. the h.265/hevc coded method based on h.264/avc macroblock structure and texture according to claim 1 or claim 2, its
It is characterised by: described t1=0.9, t2=0.4.
4. a kind of h.264/avc h.265/hevc transcoder is arrived based on h.264/avc macroblock structure and texture, its feature exists
In, comprising:
Information extraction modules, for extracting with the inter macroblocks Fractionation regimen information in the code stream of h.264/avc standard code；
Macro block composite module, meets h.265/hevc segmentation mould for 4 16x16 macro blocks h.264/avc are combined as one
The big macro block of 32x32 of formula；
Macroblock partition mode decision module, judges that whether 4 Fractionation regimen of 4 16x16 macro blocks in each big macro block are
16x16 split, if not, then using directly mapping by the way of by described macroblock partition mode map to h.265/hevc coding mode
Middle as the macroblock partition pattern h.265/hevc encoding；If so, then with the pattern discrimination method based on texture to 32x32 big macro block
Carry out other patterns to be judged, using the Fractionation regimen judging selection as the macroblock partition pattern h.265/hevc encoding；Institute
State macroblock partition mode decision module to include:
Calculate m × n macro block grain details degree α, as α > t1 when, from the Fractionation regimen of 2nx2n；When α is < during t2, using nxn
Fractionation regimen；When t2 < α < during t1, the predicting unit Fractionation regimen of employing is 2n × n, 2n × nu, 2n × nd, n × 2n, nl ×
The Fractionation regimen of 2n or nr × 2n, wherein t1 and t2 are empirical parameter set in advance.
Described grain details degree α calculates according to the following formula:
Wherein,
In above formula, f (x, y) represents the component in spatial domain position (x, y) for certain predicting unit, fmax (x, y) and fmin (x, y) point
Wei not the maximum of f (x, y) and minima；
H.265/hevc encoder, for carrying out code stream coding according to the described macroblock partition pattern h.265/hevc encoding.
5. according to claim 4 h.264/avc h.265/hevc transcoding is arrived based on h.264/avc macroblock structure and texture
Device it is characterised in that: when t2 < α < during t1, respectively calculate m × n macro block the squared difference of horizontal and vertical neighbor and, when
The squared difference of horizontal adjacent pixels and more than vertically adjacent pixel quadratic sum when, from 2n × n, 2n × nu or 2n
× nd, otherwise selects n × 2n, nl × 2n or nr × 2n.
6. the h.265/hevc coded method based on h.264/avc macroblock structure and texture according to claim 4 or 5, its
It is characterised by: described t1=0.9, t2=0.4.
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| CN104038764B (en) * | 2014-06-27 | 2016-12-28 | 华中师范大学 | A kind of H.264 arrive video transcoding method H.265 and transcoder |
| CN104079937B (en) * | 2014-07-16 | 2017-06-23 | 山东大学 | It is a kind of based on motion vector analysis by H.264 to the quick interframe code-transferring method and transcoding device of HEVC |
| CN104320656B (en) * | 2014-10-30 | 2019-01-11 | 上海交通大学 | Interframe encoding mode fast selecting method in x265 encoder |
| CN104539954B (en) * | 2014-12-01 | 2017-12-15 | 上海交通大学 | A kind of Cascading Methods of acceleration HEVC coding rates |
| CN104837019B (en) * | 2015-04-30 | 2018-01-02 | 上海交通大学 | AVS to HEVC optimization video transcoding methods based on SVMs |
| CN105430407B (en) * | 2015-12-03 | 2018-06-05 | 同济大学 | Applied to the fast inter mode decision method for H.264 arriving HEVC transcodings |
| CN105898309A (en) * | 2015-12-25 | 2016-08-24 | 乐视云计算有限公司 | Transcoding method and device |
| CN105872564B (en) * | 2016-05-27 | 2019-02-19 | 武汉拓宝科技股份有限公司 | H.264/AVC the intra prediction mode determining method and system of H.265/HEVC transcoding are arrived |
| CN106454343B (en) * | 2016-08-30 | 2019-05-14 | 电子科技大学 | The H.265 fast transcoding method of mapping is divided based on code stream bit number and block |
| CN106791828B (en) * | 2016-12-21 | 2019-05-07 | 四川大学 | Video transcoding method and its transcoder based on machine learning |
| CN109495739B (en) * | 2018-10-26 | 2021-01-15 | 杭州联海网络科技有限公司 | Image encoding method and apparatus thereof |
| CN109379592B (en) * | 2018-10-26 | 2021-04-30 | 北京北方安恒利数码技术有限公司 | Image encoding method and apparatus thereof |
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