CN110113619A - A kind of coding method, device, electronic equipment and storage medium - Google Patents
A kind of coding method, device, electronic equipment and storage medium Download PDFInfo
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- CN110113619A CN110113619A CN201910308701.4A CN201910308701A CN110113619A CN 110113619 A CN110113619 A CN 110113619A CN 201910308701 A CN201910308701 A CN 201910308701A CN 110113619 A CN110113619 A CN 110113619A
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- H—ELECTRICITY
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- 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
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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
- H04N19/169—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
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- 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
- H04N19/186—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 a colour or a chrominance component
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- H—ELECTRICITY
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
- H04N19/63—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using sub-band based transform, e.g. wavelets
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Abstract
The invention discloses a kind of coding method, device, electronic equipment and storage mediums, the described method includes: being directed to each image block of image to be encoded, a sub-symmetric transformation is carried out respectively to Y, U and V of described image block, and c sub-level transformation is carried out respectively to the Y progress b sub-level transformation after progress symmetry transformation, the U after symmetry transformation and V, wherein a, b, c are integer, and c is greater than b；According to the coefficient of the corresponding each subband of Y, U and V of transformed each image block, the image to be encoded is encoded.Occur overflowing the boundary effect of chromatic effect and image block to improve the image after coding and rebuilding.
Description
Technical field
The present invention relates to technical field of image processing more particularly to a kind of coding method, device, electronic equipment and storage to be situated between
Matter.
Background technique
Wavelet transform (Discrete Wavelet Transformation, DWT) is modern spectral image analysis work
Tool is widely used in image coding.Referring to Fig.1 shown in, wavelet transform can by image be representative 2D signal from
Time-domain signal is transformed to frequency-region signal, and every sub-symmetric transformation, alternatively referred to as every grade of symmetry transformation, including a vertical transitions
With a horizontal transformation, four subbands can be divided an image into, respectively correspond to horizontal low frequencies (L)-vertical low frequency component
(LL) the vertical low frequency sub-band of horizontal low frequencies-, the horizontal low frequencies-of corresponding horizontal low frequencies-vertical high frequency (H) component (LH) are vertical high
Frequency subband, the vertical low frequency sub-band of horizontal high-frequent-, the corresponding horizontal high-frequent-of the vertical low frequency component (HL) of corresponding horizontal high-frequent-are vertical
The horizontal high-frequent of high fdrequency component (HH)-vertical high frequency subband, and successively to the vertical low frequency sub-band of the horizontal low frequencies-obtained every time into
Row symmetry transformation, obtains four subbands of next sub-symmetric transformation, and the number until meeting wavelet transform reaches to image
The purpose that frequency is segmented at high frequency treatment time subdivision, low frequency, so as to focus in any details of image.
However, the existing International compression standards JPEG2000 based on wavelet transform is carrying out wavelet transform
When, image is changed and is divided into the identical image block of size (tile), and for luminance component (Y), the color for including in each image block
It spends component (U) and chromatic component (V) carries out identical wavelet transform, and each image block Y, U and V are carried out respectively discrete small
The coefficient that wave conversion obtains is encoded, however this encoding scheme will lead to the image after rebuilding and significantly excessive chromatic effect occurs
With image block boundaries effect, visual experience is affected.
Summary of the invention
The present invention provides a kind of coding method, device, electronic equipment and storage medium, to solve existing encoding scheme meeting
The problem of causing the image after rebuilding significantly excessive chromatic effect and image block boundaries effect occur, influencing visual experience.
In a first aspect, the invention discloses a kind of coding methods, which comprises
For each image block of image to be encoded, to luminance component Y, chromatic component U and coloration points of described image block
Amount V carries out a sub-symmetric transformation respectively, and U and V after the transformation of b sub-level, symmetry transformation are carried out to the Y after progress symmetry transformation
The transformation of c sub-level is carried out respectively, and wherein a, b, c are integer, and c is greater than b；
According to the coefficient of the corresponding each subband of Y, U and V of transformed each image block, to the figure to be encoded
As being encoded.
In an optional design, each image block for image to be encoded, Y, U to described image block and
Before V carries out a sub-symmetric transformation respectively, the method also includes:
Level shift is carried out to the image to be encoded.
In an optional design, the corresponding every height of described Y, U and V according to transformed each image block
The coefficient of band, before being encoded to the image to be encoded, the method also includes:
It is corresponding right according to the subband for the corresponding each subband of Y, U and V of transformed each image block
Claim the number of transformation, the number and frequency range of horizontal transformation, determines the corresponding quantized value of the subband；And it is corresponding according to the subband
Quantized value, the coefficient of the subband is quantified.
In an optional design, time of the number, horizontal transformation according to the corresponding symmetry transformation of the subband
Several and frequency range, determines that the corresponding quantized value of the subband includes:
Judge whether the number of the corresponding horizontal transformation of the subband is greater than the number of symmetry transformation；
If not, according to the corresponding frequency range of the subband and the corresponding frequency range of number and subband of symmetry transformation and symmetrically
The number of transformation and the corresponding relationship of quantized value determine the corresponding quantized value of the subband；
If so, corresponding according to the number of the corresponding symmetry transformation of the subband and preset target frequency bands and subband
The corresponding relationship of the number and quantized value of frequency range and symmetry transformation determines the corresponding benchmark quantized value of the subband；And according to institute
State the corresponding benchmark quantized value of subband, the subband corresponds to the number of horizontal transformation and the difference of symmetry transformation number, and default
Quantized value determine algorithm, determine the corresponding quantized value of the subband, wherein the target frequency bands be horizontal low frequencies-vertical high frequency
Or the vertical low frequency of horizontal high-frequent-.
It is described corresponding horizontal according to the corresponding benchmark quantized value of the subband, the subband in an optional design
The number of transformation and the difference of symmetry transformation number and preset quantized value determine algorithm, determine the corresponding quantization of the subband
Value includes:
According to Qhor=Qver_horx2n-mDetermine the corresponding quantized value of subband, wherein QhorFor the corresponding quantized value of subband,
Qver_horFor the corresponding benchmark quantized value of subband, n be the number of the corresponding horizontal transformation of subband, m is the corresponding symmetrical change of subband
The number changed.
Second aspect, the invention discloses a kind of code device, described device includes:
Conversion module, for being directed to each image block of image to be encoded, to the luminance component Y of described image block, coloration
Component U and chromatic component V carries out a sub-symmetric transformation respectively, and carries out b sub-level transformation, symmetrical to the Y after symmetry transformation is carried out
Transformed U and V carries out c sub-level transformation respectively, and wherein a, b, c are integer, and c is greater than b；
Coding module, for the coefficient of the corresponding each subband of Y, U and V according to transformed each image block,
The image to be encoded is encoded.
In an optional design, described device further include:
Preprocessing module, for carrying out level shift to the image to be encoded.
In an optional design, the conversion module is also used to Y, U and V for transformed each image block
Corresponding each subband is determined according to the number of the corresponding symmetry transformation of the subband, the number of horizontal transformation and frequency range
The corresponding quantized value of the subband；And according to the corresponding quantized value of the subband, the coefficient of the subband is quantified.
In an optional design, the conversion module, specifically for judging the corresponding horizontal transformation of the subband
Whether number is greater than the number of symmetry transformation；If not, according to the number of the subband corresponding frequency range and symmetry transformation, and son
The corresponding relationship of number and quantized value with corresponding frequency range and symmetry transformation determines the corresponding quantized value of the subband；If
It is, according to the number of the corresponding symmetry transformation of the subband and preset target frequency bands and the corresponding frequency range of subband and symmetrical change
The corresponding relationship of the number and quantized value that change determines the corresponding benchmark quantized value of the subband；And it is corresponding according to the subband
Benchmark quantized value, the subband correspond to the number of horizontal transformation and the difference of symmetry transformation number and preset quantized value determines
Algorithm determines the corresponding quantized value of the subband, wherein the target frequency bands are horizontal low frequencies-vertical high frequency or horizontal high-frequent-
Vertical low frequency.
In an optional design, the conversion module is specifically used for according to Qhor=Qver_horx2n-mDetermine subband pair
The quantized value answered, wherein QhorFor the corresponding quantized value of subband, Qver_horIt is that subband is corresponding for the corresponding benchmark quantized value of subband, n
The number of horizontal transformation, the number that m is the corresponding symmetry transformation of subband.
The third aspect, the invention discloses a kind of electronic equipment, including processor and memory；
It is stored with computer program in the memory, when described program is executed by the processor, so that the place
Reason device executes method described in any optional design of above-mentioned first aspect or first aspect.
Fourth aspect, the invention discloses a kind of computer readable storage medium, being stored with can be executed by electronic equipment
Computer program, when described program is run on the electronic equipment, so that the electronic equipment executes above-mentioned first party
Method described in any optional design of face or first aspect.
The present invention has the beneficial effect that:
U and V due in embodiments of the present invention, treating each image block of coded image carry out the number of horizontal transformation
Greater than the number of symmetry transformation, and it is greater than the number that horizontal transformation is carried out to Y, so that the energy of U and V coefficient is with respect to Y coefficient
Energy more concentrates on low frequency part, so that the profile information of image block is more concentrated, avoids the profile information quilt of image block
Erroneous judgement, and then the boundary effect of image appearance excessive chromatic effect and image block after coding and rebuilding is improved, improve visual experience.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is existing wavelet transform process schematic；
Fig. 2 is EBCOT coding structure schematic diagram；
Fig. 3 is a kind of one of coding method schematic diagram provided in an embodiment of the present invention；
Fig. 4 is a kind of wavelet transform process schematic provided in an embodiment of the present invention；
Fig. 5 is the subband resolution ratio schematic diagram that a kind of wavelet transform provided in an embodiment of the present invention obtains；
Fig. 6 is the corresponding quantized value schematic diagram of subband that a kind of wavelet transform provided in an embodiment of the present invention obtains；
Fig. 7 A-7B is that a kind of pair of image block provided in an embodiment of the present invention carries out wavelet transform process schematic；
Fig. 8 is the two of a kind of coding method schematic diagram provided in an embodiment of the present invention；
Fig. 9 is that reconstruction image compares the two of schematic diagram after a kind of coding provided in an embodiment of the present invention；
Figure 10 is a kind of code device structural schematic diagram provided in an embodiment of the present invention；
Figure 11 is a kind of electronic equipment schematic diagram provided in an embodiment of the present invention.
Specific embodiment
Hereinafter, the part term in the embodiment of the present invention is explained, so as to those skilled in the art understand that.
(1) YUV, colour coding method similar and a kind of with red (R) green (G) blue (B), YUV can also be divided into three points
Amount, wherein " Y " indicates brightness (Luminance or Luma), that is, gray value, " U " and " V " expression coloration
(Chrominance or Chroma) effect is description colors of image and saturation degree, the color for specified pixel.In image procossing
The common Y'UV in field, YUV, YCbCr, YPbPr etc. can be known as YUV.
(2) optimization interception built-in code block encodes (embedded block coding with optimized
Truncation, EBCOT), it is made of tier1 coding and tier2 coding two-stage (tier), shown in Figure 2, tier1 coding
Consist of three parts, respectively Bit-Plane Encoding, count (MQ) coding and multi-scale entropy (Mechanical Science and
Engineering, MSE), Bit-Plane Encoding is raw for being scanned to each bit plane of encoding block coefficient each in subband
At context (Context), MQ coding is for the coefficient to be encoded and corresponding Context according to input, after generating coding
Data, MSE is for the distortion in calculation code；Tier2 coding consists of two parts, respectively code stream organization and code rate control,
Code rate control is sent out according to the length of the data after the coding of the information and MQ of the MSE distortion calculated coding generation to code stream organization
The length of data after the coding for including in the packet for sending truncation control instruction, truncated data, and then control stream tissue to generate.
In addition, it is necessary to understand, it is multiple involved in the description of the present application, refer to two or more.
Below in conjunction with attached drawing, the embodiment of the present application is described in detail.
Embodiment 1:
Fig. 3 is a kind of coding method schematic diagram provided in an embodiment of the present invention, this method comprises:
S301: for each image block of image to be encoded, a sub-symmetry change is carried out respectively to Y, U and V of described image block
It changes, and c sub-level transformation is carried out respectively to the Y progress b sub-level transformation after progress symmetry transformation, the U after symmetry transformation and V,
Wherein a, b, c are integer, and c is greater than b.
Coding method provided in an embodiment of the present invention is applied to electronic equipment, which can set for Image Acquisition
It is standby, such as video camera, camera, it is also possible to the equipment such as mobile phone, PC (PC), tablet computer.
When treating coded image and being encoded, usually firstly the need of the division for treating coded image and carrying out image block,
In the image to be encoded of larger size can be divided into do not overlap the multiple images block with identical size, for smaller
The image to be encoded of size, can be without the division of image block, i.e., image to be encoded is directly as an image block.
Specifically, electronic equipment carries out discrete wavelet variation for each image block of image to be encoded, specifically, to every
Tri- components of Y, U and V of a image block carry out a sub-symmetric transformation respectively, and carry out b sub-level to the Y after progress symmetry transformation
U and V after transformation, symmetry transformation carry out c sub-level transformation respectively, i.e., the transformation of a sub-symmetric transformation+b sub-level are carried out to Y, to U
The transformation of a sub-symmetric transformation+c sub-level is carried out respectively with V, wherein c > b, b >=0, a > 0, preferably, b > 0.
Illustratively, it is illustrated, joins so that the Y to a certain image block carries out the transformation of+1 sub-level of 2 sub-symmetric transformation as an example
According to shown in Fig. 4, the size of image block is M*N, step 1: the image block of M*N is subjected to the vertical transitions in the 1st sub-symmetric transformation,
Obtain the vertical L subband and vertical H subband in vertical direction；Step 2: hanging down what vertical transitions in the first sub-symmetric transformation obtained
Straight L subband and vertical H subband carry out horizontal transformation, obtain four subband LL1,1, HL1,1, LH1,1, HH1, the 1, first sub-symmetry
The width of four subbands is M/2 after transformation, is highly N/2；Step 3: the LL subband that the first sub-symmetric transformation is obtained, i.e. LL1,
1 subband carries out symmetry transformation, obtains four subband LL2,2, HL2,2, LH2,2, HH2, four sons after the 2, second sub-symmetric transformation
The width of band be LL1, the 1/2 of 1 width, be highly LL1, the 1/2 of 1 height, i.e., width be M/4, be highly N/4；Step 4: right
The LL subband that second sub-symmetric transformation obtains, i.e. LL2,2 subbands carry out a horizontal transformation, obtain LL3,2 subbands, HL3,2 sons
Band completes 2 sub-symmetric transformations and the transformation of 1 sub-level, wherein LLn, m or HLn, m or LHn, m or HHn, and the n in m is horizontal transformation
Number, the number of m vertical transitions.
9/7 wavelet transform, 5/3 discrete wavelet transformer can be used by carrying out wavelet transform in embodiments of the present invention
It changes, can be configured according to demand, without repeating.
S302: according to the coefficient of the corresponding each subband of Y, U and V of transformed each image block, to it is described to
Coded image is encoded.
Specifically, electronic equipment carries out discrete wavelet transformer for Y, U and V of each image block of image to be encoded respectively
It changes, generates multiple subbands respectively for Y, U and V of each image block, as shown in figure 4, the Y for a certain image block is carried out 2 times
The transformation of+1 sub-level of symmetry transformation, symbiosis are the number of horizontal transformation at 3*m+ (n-m)+1, n, the number of m vertical transitions, totally 8
A subband, electronic equipment carry out the more of wavelet transform acquisition for Y, U and V of each image block of image to be encoded respectively
The coefficient of a subband is encoded, the compressed bit stream after generating coding.
Preferably, can be encoded in embodiments of the present invention using EBCOT, specifically, treating the every of coded image
After Y, U and V of a image block carry out wavelet transform respectively, respectively corresponded according to Y, U and V of transformed each image block
Each subband coefficient, carry out tier1 coding and tier2 coding, generate coding after compressed bit stream.
U and V due in embodiments of the present invention, treating each image block of coded image carry out the number of horizontal transformation
Greater than the number of symmetry transformation, and it is greater than the number that horizontal transformation is carried out to Y, so that the energy of U and V coefficient is with respect to Y coefficient
Energy more concentrates on low frequency part, so that the profile information of image block is more concentrated, avoids the profile information quilt of image block
Erroneous judgement, and then the boundary effect that excessive chromatic effect and image block occurs in the image after coding and rebuilding is improved, improve visual experience.
Embodiment 2:
On the basis of the above embodiments, in embodiments of the present invention, each image block for image to be encoded,
Before carrying out a sub-symmetric transformation respectively to Y, U and V of described image block, the method also includes:
Level shift is carried out to the image to be encoded.
It under normal conditions, is RGB color coding mode by the image that the image capture devices such as camera acquire, in image
The pixel value of pixel is between 0-255, no symbol, and the image by RGB color coding mode is needed to be converted to YUV color volume
The image of pattern.
Specifically, signless pixel value is converted to the pixel value of symbol by level shift by electronic equipment, such as will
Pixel value will go 128, and the value of the pixel value that will turn into symbol corresponding R, G, B, be converted to the value of Y, U, V.
It is illustrative: P can be passed throughDC(m, n)=P (m, n) -2prec- 1, signless image pixel value has been converted to
The pixel value of symbol, wherein PDC (m, n) be conversion after have the pixel value of symbol, P (m, n) be convert before pixel value, prec be
Image depth values, m, n are the coordinate of pixel.And R, G, B can be realized by Y=(R+2*G+B)/4, U=R-G, V=B-G
The conversion of value of value to Y, U, V determine that image depth values are the prior arts in embodiments of the present invention, no longer repeated.
Embodiment 3:
For the boundary effect for further improving excessive chromatic effect, weakening image block, on the basis of the various embodiments described above,
In the embodiment of the present invention, the coefficient of the corresponding each subband of described Y, U and V according to transformed each image block is right
Before the image to be encoded is encoded, the method also includes:
It is corresponding right according to the subband for the corresponding each subband of Y, U and V of transformed each image block
Claim the number of transformation, the number and frequency range of horizontal transformation, determines the corresponding quantized value of the subband；And it is corresponding according to the subband
Quantized value, the coefficient of the subband is quantified.
In embodiments of the present invention, frequency range refers to horizontal low frequencies-vertical low frequency, horizontal low frequencies-vertical high frequency, horizontal high-frequent-
One of vertical low frequency, horizontal high-frequent-vertical high frequency.
In embodiments of the present invention, can become for the number of the corresponding identical or different symmetry transformation of subband, level
Identical or different quantized value is arranged in the number and frequency range changed, quantifies to the coefficient of subband, illustratively, to all symmetrical
The number of transformation, the number of horizontal transformation and frequency range are arranged identical quantized value and are quantified, and being such as respectively provided with quantized value is 2, right
The coefficient of coefficient being quantified as after coefficient * 2=quantization.
Preferably, it is described according to the number of the corresponding symmetry transformation of the subband, the number of horizontal transformation and frequency range, it determines
The corresponding quantized value of the subband includes:
Judge whether the number of the corresponding horizontal transformation of the subband is greater than the number of symmetry transformation；
If not, according to the corresponding frequency range of the subband and the corresponding frequency range of number and subband of symmetry transformation and symmetrically
The number of transformation and the corresponding relationship of quantized value determine the corresponding quantized value of the subband；
If so, corresponding according to the number of the corresponding symmetry transformation of the subband and preset target frequency bands and subband
The corresponding relationship of the number and quantized value of frequency range and symmetry transformation determines the corresponding benchmark quantized value of the subband；And according to institute
State the corresponding benchmark quantized value of subband, the subband corresponds to the number of horizontal transformation and the difference of symmetry transformation number, and default
Quantized value determine algorithm, determine the corresponding quantized value of the subband, wherein the target frequency bands be horizontal low frequencies-vertical high frequency
Or the vertical low frequency of horizontal high-frequent-.It is calculated to simplify, it can be only using horizontal low frequencies-vertical high frequency as target frequency bands.
Number and the symmetry transformation that horizontal transformation is corresponded to according to the corresponding benchmark quantized value of the subband, the subband
The difference of number and preset quantized value determine algorithm, determine that the corresponding quantized value of the subband includes:
According to Qhor=Qver_horx2n-mDetermine the corresponding quantized value of subband, wherein QhorFor the corresponding quantized value of subband,
Qver_horFor the corresponding benchmark quantized value of subband, n be the number of the corresponding horizontal transformation of subband, m is the corresponding symmetrical change of subband
The number changed.
In embodiments of the present invention, the corresponding relationship of the number and quantized value of the corresponding frequency range of subband and symmetry transformation can be with
It presets, can also be known by consulting JPEG2000 standard, without limiting.
Illustratively, by taking the Y to image block carries out into 2 sub-symmetric transformations and the transformation of 1 sub-level as an example, as shown in figure 5, becoming
The image block for changing acquisition includes 4 class resolution ratios, and LL3,2 be the first class resolution ratio (R0), and HL3,2 be the second class resolution ratio (R1),
And LL3,2 and HL3,2 subband only to carry out horizontal transformation acquisition, HL2,2, LH2,2, HH2,2 be third class resolution ratio (R2),
HL1,1, LH1,1, HH1,1 is fourth stage resolution ratio (R3).Wherein R2 is the minimum class resolution ratio that Symmetric Decomposition obtains.
The corresponding relationship of the number and quantized value of the corresponding frequency range of subband and symmetry transformation is to provide in JPEG2000 standard
The corresponding frequency range of subband and symmetry transformation number and quantized value corresponding relationship, referring to shown in Fig. 6, HL2,2 corresponding amounts
It is 3.989, HH2,2 corresponding quantized values is 3.865, HL1,1 corresponding quantization that change value, which is 3.989, LH2,2 corresponding quantized values,
It is 2.022, HH1,1 corresponding quantized value is 2.080, LL3,2 and HL3 that value, which be 2.022, LH1,1 corresponding quantized value, 2 correspondences
Benchmark quantized value be LH2,2 corresponding quantized values, LL3,2 and HL3,2 corresponding quantized values be LH2,2 corresponding quantized value *
2n-m, it is 2*3.989.
It in embodiments of the present invention, is according to discrete for only carrying out the corresponding quantized value of subband of horizontal transformation acquisition
What the gain analysis that wavelet transformation converts the coefficient of acquisition every time determined, according to the standard analysis data of JPEG2000, only carry out
The horizontal transformation or vertical transitions of wavelet transform, the i.e. gain of the one-dimensional transform of wavelet transform are exported such as 1 institute of table
Show, it includes 6 that the shift step used image block or subband progress horizontal transformation or vertical transitions is identical with transformation for mula altogether
Shift step (step), step is as follows:
Y (2n+1)=x (2n+1)+α [x (2n)+x (2n+2)] --- step1
Y (2n)=x (2n)+β [x (2n-1)+x (2n+1)] --- step2
Y (2n+1)=y (2n+1)+γ [y (2n)+y (2n+2)] --- step3
Y (2n)=y (2n)+δ [y (2n-1)+y (2n+1)] --- step4
Y (2n+1)=κ [y (2n+1)] --- step5
Y (2n)=1/ κ [y (2n)] --- step6
Wherein, α=1.586134342, β=0.052980118, γ=- 0.882911075, δ=- 0.443506852, κ
=1.625732422, (2n), (2n+1), (2n-1), (2n+2) etc. are used to indicate the position of pixel in image block or subband, n
Original (initial) pixel value of pixel, the y of each step left side of the equal sign are indicated in=0,1,2 ..., x expression image block or subband
By the pixel value of the step pixel obtained, the y of right side of the equal sign indicates the pixel value in the step preceding pixel point, such as
The y of left side of the equal sign indicates that the pixel value by the step4 pixel obtained, the y of right side of the equal sign are indicated before step4 in step4
The pixel value of pixel, i.e., the pixel value of pixel after step1-step3.
What the gain of each step transformation coefficient horizontally or vertically converted and each step of final one-dimensional transform obtained
The gain of coefficient is identical as follows:
Table 1
Table 1 is the gain of the coefficient of the every step output of wavelet transform subband, wherein the gain of the coefficient of every step output is
log2(H/Q), wherein H is that the mean value of coefficient, Q are the first of sub-band coefficients after subband is converted by each step of above-mentioned transformation for mula
Beginning mean value.As shown in table 1, dispersion wavelet transformation includes 6 setp, and the gain for the coefficient that each setp is obtained is as listed in Table 1,
Setp5 is completed, that is, obtains the high frequency coefficient of one-dimensinal discrete small wave transformation, step6 is completed, that is, obtains one-dimensinal discrete small wave transformation
Low frequency coefficient.By above-mentioned table 1 it is found that the gain for completing coefficient after one-dimensinal discrete small wave transformation is no more than 1 (bit).Complete
One-dimensinal discrete small wave transformation obtain coefficient as a result, divided by initial input coefficient quotient without departing from 2.Thus only horizontal to become
Change the subband of acquisition, the determination algorithm of LL and the corresponding quantized value of HL is approximately as described below:
Qhor=Qver_horx2n-m
This programme is suitable for all coding methods using wavelet transform, is not limited solely to JPEG2000 coding.
Fig. 7 A is that a kind of couple of image block Y provided in an embodiment of the present invention carries out wavelet transform process schematic, step
1: obtaining the number for needing number and horizontal transformation to the Y vertical transitions carried out；Step 2: vertical transitions being carried out to Y, obtain Y
The subband that vertical transitions obtain；Step 3: horizontal transformation being carried out to the subband that step 2 obtains, the symmetry transformation of a Y is completed, obtains
Take the LL subband of Y, HL subband, LH subband, HH subband；Step 4: judging whether Y vertical transitions are completed, that is, judge to have carried out hangs down
Whether the number directly converted, which is equal to, needs the number to the Y vertical transitions carried out to enter step 5 if vertical transitions are completed, if
Then return step 2 are not completed；Step 5: judging whether Y horizontal transformation is completed, that is, judge the number of horizontal transformation carried out
Whether it is equal to the number needed to the Y horizontal transformation carried out, if horizontal transformation is completed, step 7 is carried out, if not completing to carry out
Step 6；Step 6: the LL subband that last time horizontal transformation is got carries out horizontal transformation, obtains LL subband and HL subband,
And return step 5；Step 7: the corresponding quantized value of each subband of Y is determined, and according to the corresponding quantized value of each subband, to each subband
Coefficient quantified.
Fig. 7 B is that the U or V of a kind of pair of image block provided in an embodiment of the present invention carry out wavelet transform process schematic,
In embodiments of the present invention, to the U of image block or V carry out wavelet transform process schematic with to the Y of image block carry out from
The process for dissipating wavelet transformation is similar, is no longer repeated.
Fig. 8 is a kind of coding method schematic diagram provided in an embodiment of the present invention, treats coded image and carries out level shift, and
Carry out wavelet transform respectively for Y, U and V of each image block of image to be encoded, and carried out respectively according to Y, U and V from
The corresponding quantized value of each subband that wavelet transformation obtains is dissipated, carries out every height of wavelet transform acquisition respectively to Y, U and V
The coefficient of band is quantified, and carries out the progress of the coefficient after each quantized subband of wavelet transform acquisition respectively to Y, U and V
Tier1 coding and tier2 coding, export compressed bit stream.
Referring to shown in Fig. 9, using the image after the image after this programme coding and rebuilding compared with the existing technology coding and rebuilding,
Avoid the boundary effect of excessive chromatic effect and image block.
Embodiment 4:
Figure 10 is a kind of code device structural schematic diagram provided in an embodiment of the present invention, and described device includes:
Conversion module 11, for being directed to each image block of image to be encoded, to Y, U and V of described image block respectively into
Row a sub-symmetric transformation, and c is carried out respectively to the Y progress b sub-level transformation after progress symmetry transformation, the U after symmetry transformation and V
Sub-level transformation, wherein a, b, c are integer, and c is greater than b；
Coding module 12, what it is for the corresponding each subband of Y, U and V according to transformed each image block is
Number, encodes the image to be encoded.
Preferably, described device further include:
Preprocessing module 13, for carrying out level shift to the image to be encoded.
Preferably, the conversion module 11, Y, U and the V for being also used to be directed to transformed each image block are corresponding
Each subband determines the subband pair according to the number of the corresponding symmetry transformation of the subband, the number of horizontal transformation and frequency range
The quantized value answered；And according to the corresponding quantized value of the subband, the coefficient of the subband is quantified.
Preferably, whether the conversion module 11, the number specifically for judging the corresponding horizontal transformation of the subband are big
In the number of symmetry transformation；If not, according to the corresponding frequency of number and subband of the corresponding frequency range of the subband and symmetry transformation
The corresponding relationship of the number and quantized value of section and symmetry transformation, determines the corresponding quantized value of the subband；If so, according to described
The number and amount of the number of the corresponding symmetry transformation of subband and preset target frequency bands and the corresponding frequency range of subband and symmetry transformation
The corresponding relationship of change value determines the corresponding benchmark quantized value of the subband；And according to the corresponding benchmark quantized value of the subband, institute
State that subband corresponds to the number of horizontal transformation and the difference of symmetry transformation number and preset quantized value determines algorithm, determine described in
The corresponding quantized value of subband, wherein the target frequency bands are horizontal low frequencies-vertical high frequency or the vertical low frequency of horizontal high-frequent-.
Preferably, the conversion module 11 is specifically used for according to Qhor=Qver_horx2n-mDetermine the corresponding quantization of subband
It is worth, wherein QhorFor the corresponding quantized value of subband, Qver_horIt is the corresponding horizontal change of subband for the corresponding benchmark quantized value of subband, n
The number that changes, the number that m is the corresponding symmetry transformation of subband.
Embodiment 5:
Based on the same inventive concept, a kind of electronic equipment is additionally provided in the embodiment of the present invention, due to above-mentioned electronic equipment
The principle solved the problems, such as is similar to coding method, therefore the implementation of above-mentioned electronic equipment may refer to the implementation of method, repetition
Place repeats no more.
It as shown in figure 11, is the structural schematic diagram of electronic equipment provided in an embodiment of the present invention, wherein in Figure 11, always
Line architecture may include the bus and bridge of any number of interconnection, the one or more processors for specifically having processor 111 to represent
The various circuits of the memory represented with memory 112 link together.Bus architecture can also will such as peripheral equipment, pressure stabilizing
Various other circuits of device and management circuit or the like link together, and these are all it is known in the art, therefore, this
Text is no longer described further it.Bus interface provides interface.Processor 111 is responsible for management bus architecture and common place
Reason, memory 112 can store the used data when executing operation of processor 111.
In electronic equipment provided in an embodiment of the present invention:
The processor 111 executes following procedure: for be encoded for reading the computer program in memory 112
Each image block of image carries out a sub-symmetric transformation to Y, U and V of described image block respectively, and to symmetry transformation is carried out after
Y carries out the U after the transformation of b sub-level, symmetry transformation and V carries out c sub-level transformation respectively, and wherein a, b, c are integer, and c is greater than b；
According to the coefficient of the corresponding each subband of Y, U and V of transformed each image block, the image to be encoded is compiled
Code.
Preferably, the processor 111 is also used to carry out level shift to the image to be encoded.
Preferably, the processor 111, Y, U and the V for being also used to be directed to transformed each image block are corresponding every
A subband determines that the subband is corresponding according to the number of the corresponding symmetry transformation of the subband, the number of horizontal transformation and frequency range
Quantized value；And according to the corresponding quantized value of the subband, the coefficient of the subband is quantified.
Preferably, the processor 111, specifically for judging whether the number of the corresponding horizontal transformation of the subband is greater than
The number of symmetry transformation；If not, according to the corresponding frequency range of number and subband of the corresponding frequency range of the subband and symmetry transformation
With the number of symmetry transformation and the corresponding relationship of quantized value, the corresponding quantized value of the subband is determined；If so, according to the son
Number and the quantization of number with corresponding symmetry transformation and preset target frequency bands and the corresponding frequency range of subband and symmetry transformation
The corresponding relationship of value determines the corresponding benchmark quantized value of the subband；And according to the corresponding benchmark quantized value of the subband, described
Subband corresponds to the number of horizontal transformation and the difference of symmetry transformation number and preset quantized value determines algorithm, determines the son
With corresponding quantized value, wherein the target frequency bands are horizontal low frequencies-vertical high frequency or the vertical low frequency of horizontal high-frequent-.
Preferably, the processor 111 is specifically used for according to Qhor=Qver_horx2n-mDetermine the corresponding quantized value of subband,
Wherein QhorFor the corresponding quantized value of subband, Qver_horIt is the corresponding horizontal transformation of subband for the corresponding benchmark quantized value of subband, n
Number, m be the corresponding symmetry transformation of subband number.
On the basis of the various embodiments described above, the embodiment of the invention also provides a kind of computers to store readable storage medium
Matter is stored with the computer program that can be executed by electronic equipment in the computer readable storage medium, when described program is in institute
It states when being run on electronic equipment, so that the electronic equipment executes the coding method of above-described embodiment description.
For systems/devices embodiment, since it is substantially similar to the method embodiment, so the comparison of description is simple
Single, the relevent part can refer to the partial explaination of embodiments of method.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although the preferred embodiment of the application has been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the application range.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (12)
1. a kind of coding method, which is characterized in that the described method includes:
For each image block of image to be encoded, to luminance component Y, chromatic component U and chromatic component V points of described image block
Not carry out a sub-symmetric transformation, and to carry out the Y after symmetry transformation carry out the transformation of b sub-level, the U after symmetry transformation and V respectively into
The transformation of row c sub-level, wherein a, b, c are integer, and c is greater than b；
According to the coefficient of the corresponding each subband of Y, U and V of transformed each image block, to the image to be encoded into
Row coding.
2. the method as described in claim 1, which is characterized in that each image block for image to be encoded, to described
Before Y, U and V of image block carry out a sub-symmetric transformation respectively, the method also includes:
Level shift is carried out to the image to be encoded.
3. the method as described in claim 1, which is characterized in that described to be distinguished according to Y, U and V of transformed each image block
The coefficient of corresponding each subband, before being encoded to the image to be encoded, the method also includes:
For the corresponding each subband of Y, U and V of transformed each image block, according to the corresponding symmetrical change of the subband
The number and frequency range of the number, horizontal transformation that change determine the corresponding quantized value of the subband；And according to the corresponding amount of the subband
Change value quantifies the coefficient of the subband.
4. method as claimed in claim 3, which is characterized in that the number according to the corresponding symmetry transformation of the subband,
The number and frequency range of horizontal transformation determine that the corresponding quantized value of the subband includes:
Judge whether the number of the corresponding horizontal transformation of the subband is greater than the number of symmetry transformation；
If not, according to the corresponding frequency range of number and subband and symmetry transformation of the corresponding frequency range of the subband and symmetry transformation
Number and quantized value corresponding relationship, determine the corresponding quantized value of the subband；
If so, according to the number of the corresponding symmetry transformation of the subband and preset target frequency bands and the corresponding frequency range of subband
With the number of symmetry transformation and the corresponding relationship of quantized value, the corresponding benchmark quantized value of the subband is determined；And according to the son
The number of horizontal transformation and the difference and preset amount of symmetry transformation number are corresponded to corresponding benchmark quantized value, the subband
Change value determines algorithm, determines the corresponding quantized value of the subband, wherein the target frequency bands are horizontal low frequencies-vertical high frequency or water
The vertical low frequency of flat high frequency-.
5. method as claimed in claim 4, which is characterized in that it is described according to the corresponding benchmark quantized value of the subband, it is described
Subband corresponds to the number of horizontal transformation and the difference of symmetry transformation number and preset quantized value determines algorithm, determines the son
Include: with corresponding quantized value
According to Qhor=Qver_horx2n-mDetermine the corresponding quantized value of subband, wherein QhorFor the corresponding quantized value of subband, Qver_horFor
The corresponding benchmark quantized value of subband, n are the number of the corresponding horizontal transformation of subband, the number that m is the corresponding symmetry transformation of subband.
6. a kind of code device, which is characterized in that described device includes:
Conversion module, for being directed to each image block of image to be encoded, luminance component Y, chromatic component U to described image block
A sub-symmetric transformation is carried out respectively with chromatic component V, and the transformation of b sub-level, symmetry transformation are carried out to the Y after progress symmetry transformation
U and V afterwards carries out c sub-level transformation respectively, and wherein a, b, c are integer, and c is greater than b；
Coding module, for the coefficient of the corresponding each subband of Y, U and V according to transformed each image block, to institute
Image to be encoded is stated to be encoded.
7. device as claimed in claim 6, which is characterized in that described device further include:
Preprocessing module, for carrying out level shift to the image to be encoded.
8. device as claimed in claim 6, which is characterized in that the conversion module is also used to for transformed each figure
As the corresponding each subband of Y, U and V of block, according to time of the number of the corresponding symmetry transformation of the subband, horizontal transformation
Several and frequency range, determines the corresponding quantized value of the subband；And according to the corresponding quantized value of the subband, to the coefficient of the subband
Quantified.
9. device as claimed in claim 8, which is characterized in that the conversion module is specifically used for judging that the subband is corresponding
The number of horizontal transformation whether be greater than the number of symmetry transformation；If not, according to the corresponding frequency range of the subband and symmetrical change
The number of the corresponding frequency range of number and subband and symmetry transformation changed and the corresponding relationship of quantized value determine that the subband is corresponding
Quantized value；If so, corresponding according to the number of the corresponding symmetry transformation of the subband and preset target frequency bands and subband
The corresponding relationship of the number and quantized value of frequency range and symmetry transformation determines the corresponding benchmark quantized value of the subband；And according to institute
State the corresponding benchmark quantized value of subband, the subband corresponds to the number of horizontal transformation and the difference of symmetry transformation number, and default
Quantized value determine algorithm, determine the corresponding quantized value of the subband, wherein the target frequency bands be horizontal low frequencies-vertical high frequency
Or the vertical low frequency of horizontal high-frequent-.
10. device as claimed in claim 9, which is characterized in that the conversion module is specifically used for according to Qhor=Qver_ horx2n-mDetermine the corresponding quantized value of subband, wherein QhorFor the corresponding quantized value of subband, Qver_horFor the corresponding datum quantity of subband
Change value, n are the number of the corresponding horizontal transformation of subband, the number that m is the corresponding symmetry transformation of subband.
11. a kind of electronic equipment, which is characterized in that including processor and memory；
It is stored with computer program in the memory, when described program is executed by the processor, so that the processor
Perform claim requires the step of any one of 1-5 the method.
12. a kind of computer readable storage medium, which is characterized in that it is stored with the computer journey that can be executed by electronic equipment
Sequence, when described program is run on the electronic equipment, so that the electronic equipment perform claim requires described in any one of 1-5
The step of method.
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