CN109618157A - A kind of system for implementing hardware and method of video display stream compressed encoding - Google Patents
A kind of system for implementing hardware and method of video display stream compressed encoding Download PDFInfo
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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
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- 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
- H04N19/182—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 pixel
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
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Abstract
The invention discloses system for implementing hardware and method that a kind of video shows stream compressed encoding, comprising: caches after converting the coding rgb format to be compressed of input and as raw pixel data；The reconstructed value of adjacent pixel needed for predicting is extracted, the pixel predictors for obtaining and currently organizing are calculated；It is made the difference with raw pixel data and obtains current group of pixels quantization residual values；The pixel predictors for quantifying residual values according to current group of pixels and currently organizing calculate, and obtain the reconstructed value of current group of pixels；The pixel reconstructed value and raw pixel data that history according to the pre-stored data uses compare, and obtain pixel reconstructed value and pixel index value under color history index；Reconstructed value is stored；Residual values are quantified to pixel and pixel index value carries out being separately encoded output entropy coding data, are multiplexed into a group data stream, and cache and export after splicing according to storage order.The present invention can effectively improve the processing speed of compression of images, while remain the compression of images performance of DSC encoder.
Description
Technical field
The present invention relates to system for implementing hardware and method that a kind of video shows stream compressed encoding, belong to image compression encoding
Technical field.
Background technique
Display technology is fast-developing at present, shows that the bandwidth requirement of link is proportional with the raising of monitor resolution
It is promoted.However some display links are unable to satisfy the bandwidth demand of high-clear display, can carry out compression of images to pixel data
Make lower display link bandwidth that can also provide the digital video for meeting high-clear display.
DSC algorithm be video electronic association (Video Electronic Standard Association, VESA) and
A kind of Standard of image compression that MIPI alliance formulates, compared with other videos, the relevant technology of image encoding context, DSC is being solved
Certainly have the advantages that at low cost, be delayed short, low-power consumption between processor and display in link bandwidth problem, by realization vision without
The picture compression of damage reduces transmitted data amount, and the video letter of transmission high definition or ultra high-definition is able to lower display link bandwidth
Number, while being implemented with more succinct hardware, it is operated to solve other image compression schemes in traditional display equipment
Complexity implements more expensive disadvantage.
DSC technique target is used in the display end (USB of smart phone, tablet computer of embedded product, mobile device
Type-C DP1.4 video interface), multimedia (real-time display of multi pass acquisition video in the AR/VR helmet), automobile (advanced driving
In auxiliary system (ADAS) in the multiplex of video information.With the promotion of screen resolution and frame per second, to code rate
Requirement it is higher and higher, software-based DSC algorithm is slower to the compression speed of image, when handling mass data need
Consume the long period.
Summary of the invention
Technical problem to be solved by the present invention lies in ask for the DSC compression algorithm rate currently based on software is low
Topic, the present invention proposes the system for implementing hardware and method of a kind of video display stream compressed encoding, to effectively improve pressure compression of images
When execution efficiency, thus effectively reduce compression consumed by the time.
The present invention specifically uses following technical scheme to solve above-mentioned technical problem:
A kind of system for implementing hardware of video display stream compressed encoding, comprising:
Color-space conversion module, for converting compressed encoding for the video source pixel of the coding rgb format to be compressed of input
The pixel data of required YCoCg format；
Picture element caching module, for using the pixel data of YCoCg format obtained by color-space conversion module as original image prime number
According to being cached；
Control module obtains raw pixel data for extracting from picture element caching module, and Ji Conghang cache module extracts to obtain pre-
The reconstructed value of adjacent pixel needed for surveying, and generate the control signal for being used for compressed encoding；
Prediction module, for being used for the control signal of compressed encoding according to produced by control module, by the adjacent picture of current pixel
The reconstructed value of element calculates the pixel predictors for obtaining and currently organizing；
Quantization modules, the raw pixel data for extracting the pixel predictors currently organized and control module make the difference acquisition pixel
Residual values obtain current group of pixels according to quantization parameter operation and quantify residual values；
Difference rebuilds module, and the current group of pixels quantization residual values and prediction module for obtaining quantization modules obtain current
The pixel predictors of group calculate the reconstructed value for obtaining current group of pixels；
The original that color history index module, the pixel reconstructed value used for history according to the pre-stored data and control module are extracted
Beginning pixel data compares, and obtains reconstructed value and pixel index value that color history indexes lower pixel；
Row cache module, for difference to be rebuild to reconstructed value and the color history index module institute of the current group of pixels that module obtains
The reconstructed value of pixel is obtained, the reconstructed value of pixel under one of mode is chosen, data storage is carried out using ping-pong operation mode；
Entropy code module, for current group of pixels quantify pixel index value that residual values and color history index module obtain into
Row is separately encoded to obtain two kinds of entropy coding data, and selects one of coding mode to export corresponding entropy coding number by calculating
According to；
A kind of code stream multiplex module, entropy coding data for being exported according to entropy code module, obtains tri- components of Y, CO, Cg
Compressed data stream, and the data flow multiplexing of three components is exported at a group data stream；
Rate caches fifo module, for carrying out caching to the group data stream that code stream multiplex module exports and according to storage order
It is exported after splicing.
Further, as a preferred technical solution of the present invention: further including flatness detection module and code rate control
Module, wherein flatness detection module, for sentencing to the flat case where the original pixels currently organized in control module
It is disconnected, obtain flatness signal；The rate control module, for exporting upper one group according to flatness signal and entropy code module
The QP value that the bit number of entropy coding data is currently organized is adjusted.
Further, as a preferred technical solution of the present invention: the rate control module includes empty full degree mould
Block, linear transformation module, advantage parameter selecting module, short item QP value adjust module, hollow full degree module, for according to entropy
It the bit number for upper one group of entropy coding data that coding module is exported and currently organizes the bit number to be compressed that get of encoding and is counted
It calculates, obtains sky full scale；The linear transformation module, an empty full scale for being converted in certain section according to empty full scale
Value；The advantage parameter selecting module, for carrying out the bound that section compares determining QP value according to empty full scale value；The short item
QP value adjusts module, the QP value adjustment for currently being organized according to the bound of flatness signal and QP value.
Further, as a preferred technical solution of the present invention: the color history index module includes that color is gone through
History memory module, difference calculating module, index value searching module, maximum accidentally value computing module, wherein difference calculating module, is used for
The pixel reconstructed value that the raw pixel data of input and the pre-stored history of color historical storage module are used carries out absolute
Difference calculates, and obtains difference；The index value searching module, the difference comparsion for being obtained according to difference calculating module obtain minimum
The group of difference and its corresponding index value；The maximum accidentally value computing module, the rope for obtaining index value searching module
Draw the corresponding pixel value of value to make the difference as pixel reconstructed value and with raw pixel data, to the errors of three pixels in one group into
Row relatively obtains wherein worst error value, and gained index value, worst error value are exported to entropy code module, and pixel is rebuild
Value determines whether to be input in row cache module by selector selection.
Further, as a preferred technical solution of the present invention: the entropy code module include check computing module,
Predicted size module, DSU_VLC coding module, ICH coding module, selecting module, wherein computing module is checked, for according to defeated
The current group of pixels quantization residual values calculation code length entered；The ICH coding module, for being compiled to the index value of input
Code obtains the coded data of index value；The DSU_VLC coding module, for every to current group according to calculated code length
A pixel quantization residual values coding obtains the coded data of current group of pixels quantization residual values；The predicted size module is used for root
Size prediction is carried out as next according to the coded data size of the current group of pixels quantization residual values of DSU_VLC coding module output
The inspection computing module input of group；The selecting module, for the coded data and current group of pixels quantization residual error from index value
One kind is selected in the coded data of value and is exported.
Further, as a preferred technical solution of the present invention: the rate caching fifo module is to code stream multiplex
One group data stream of module output cache and is exported after splicing according to storage order, specifically:
To code stream multiplex module output a group data stream splice according to storage order, and judge spliced data length with it is upper
Whether remaining bits meet splicing output condition after primary splicing, and satisfaction then exports the group data stream, and will exceed in data flow
The data of splicing output condition are remained as the remaining bits spliced next time.
Further, as a preferred technical solution of the present invention: the splicing output condition is data code flow splicing
It is 48 full.
The present invention also proposes a kind of hardware implementation method of video display stream compressed encoding, comprising the following steps:
By the video source pixel of the coding rgb format to be compressed of input, it is converted into the pixel number of YCoCg format needed for compressed encoding
According to and will cache as raw pixel data；
Extraction obtains extracting the reconstructed value for obtaining predicting required adjacent pixel in raw pixel data, and caching；According to generation
For the control signal of compressed encoding, the pixel prediction for obtaining and currently organizing is calculated by the reconstructed value of the adjacent pixel of current pixel
Value；
The pixel predictors currently organized and raw pixel data are made the difference and obtain pixel residual values, are obtained according to quantization parameter operation
Current group of pixels quantifies residual values；The pixel predictors for quantifying residual values according to the current group of pixels of acquisition and currently organizing calculate,
Calculate the reconstructed value for obtaining current group of pixels；
The pixel reconstructed value and raw pixel data that history according to the pre-stored data uses compare, and obtain color history index
The reconstructed value and pixel index value of lower pixel；The reconstructed value of the current group of pixels of acquisition and color history are indexed to the weight of lower pixel
Built-in value takes the reconstructed value of pixel under one of mode, carries out data storage using ping-pong operation mode；
Quantify the pixel index value that residual values and color history index module obtain to current group of pixels to be separately encoded to obtain
Two kinds of entropy coding data, and select one of coding mode to export corresponding entropy coding data by calculating；According to output
A kind of entropy coding data, obtain the compressed data stream of tri- components of Y, CO, Cg, by the data flow multiplexing of three components at one group of number
According to stream, and cache and exported after splicing according to storage order.
Further, as a preferred technical solution of the present invention: the method also includes to the original image currently organized
Flat case where plain is judged, flatness signal is obtained；According to the ratio of flatness signal and upper one group of entropy coding data
The QP value that special number is currently organized is adjusted.
Further, as a preferred technical solution of the present invention: the method also includes to a group data stream according to
Storage order splicing, and judge whether spliced data length meets splicing output bars with remaining bits after last splicing
Part, satisfaction then export the group data stream, otherwise remain the data beyond splicing output condition in data flow as next
The remaining bits of secondary splicing.
The present invention by adopting the above technical scheme, can have the following technical effects:
The system for implementing hardware and method of video display stream compressed encoding proposed by the present invention, can effectively improve the place of compression of images
Speed is managed, while remaining the compression of images performance of DSC encoder, meets the needs of display link bandwidth.
Therefore, the advantages of the present invention over the prior art are that:
(1) DSC coded hardware implementation method of the present invention can be realized all using on-site programmable gate array FPGA, have full stream
The good feature of waterline, real-time；
(2) present invention carries out hardware realization in accordance with DSC standard completely, calculated result and canonical algorithm equivalent, avoid for
Convenience in hardware realization and the shortcomings that causing compression of images performance to decline of modifying to former algorithm content, so that of the invention
With good compression of images performance；
(3) present invention is in prediction pixel, the advantage calculated using hardware concurrent, by different prediction technique calculating process using simultaneously
The processing of row computing technique, critical path delay is less, is more advantageous to the promotion of system operational speed；
(4) it is all possible as a result, in the look-up table being stored in inside FPGA to precompute prefix code for the method for the present invention, leads to
It crosses and compares mapping value and table look-up available corresponding result.Tabling look-up for the step can be completed with the monocycle, and assembly line is realized.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the system for implementing hardware of video of the present invention display stream compressed encoding.
Fig. 2 is the structural schematic diagram of color history index module in the present invention.
Fig. 3 is the structural schematic diagram of rate control module in the present invention.
Fig. 4 is the flow chart that code rate control is realized in the present invention.
Fig. 5 is the structural schematic diagram of entropy code module in the present invention.
Fig. 6 is the flow diagram of the hardware implementation method of video of the present invention display stream compressed encoding.
Specific embodiment
Embodiments of the present invention are described with reference to the accompanying drawings of the specification.
As shown in Figure 1, the present invention devises a kind of system for implementing hardware of video display stream compressed encoding, DSC coding
System for implementing hardware specifically include that color-space conversion module 101, data read in picture element caching module 102, control module
103, prediction module 104, quantization modules 105, difference rebuild module 106, color history index module 107, flatness and detect mould
Block 108, rate control module 109, entropy code module 110, row cache module 111, code stream multiplex module 112, rate caching
FIFO113。
Wherein, the color-space conversion module 101 will for receiving the rgb video source pixel for needing to compress from external
The video source pixel of the coding rgb format to be compressed of input is converted into the pixel data of YCoCg format needed for compressed encoding, wherein
Each pixel includes 3 components；Realize the format conversion of pixel between external pending data and DSC coded system.
The picture element caching module 102, for using the pixel data of YCoCg format obtained by color-space conversion module as
Raw pixel data is cached；By the pixel data converted be stored in picture element caching module 102, can from storage device by
Read the pixel data needed in address.In this way, pixel data caching directly to be encoded may be implemented in picture element caching module 102.
The control module 103 connects the picture element caching module 102 and row cache module 111, is used for from picture element caching
Module proposes 102 acquirements raw pixel data to required for quantifying, with 3 pixels for one group of carry out subsequent processing；And it is slow from row
Storing module 111 extracts the reconstructed value for obtaining predicting required adjacent pixel, and generates the control signal for being used for compressed encoding；
For example, a upper pixel number value information is transmitted at current pixel point coding, a upper pixel number value information is made
For the neighbor point of currently processed pixel.It being used in coding, for control module for the pixel read, 3 pixels are one group,
Judge whether currently processed pixel group is in the first trip of the picture, if it is, by its neighbor point of current pixel position
In the prediction reconstructed value of lastrow pixel be assigned a value of 128,256,256 respectively according to Y, Co, Cg.If it is not, by current pixel
The corresponding position relationship of pixel adjacent thereto successively reads the corresponding lastrow adjacent pixel letter of current pixel from memory
Breath.
The prediction module 104, link control module 103 are compiled for what is generated according to control module 103 for compressing
The control signal of code calculates the pixel predictors for obtaining and currently organizing by the reconstructed value of the adjacent pixel of current pixel；In the present invention
Pixel prediction is carried out using a variety of prediction modes, so multiple groups pixel predictors can be obtained accordingly.It is pre- according to DSC in the present embodiment
3 kinds of prediction modes of use of survey: improved adaptive median prediction MMAP, block predict BP and middle point prediction MPP.Respectively according to it
Predictor formula and method, while being predicted, obtain the pixel predictors currently organized.
The quantization modules 105 connect the prediction module 104, for by the pixel predictors currently organized respectively with
The raw pixel data that control module is extracted, which makes the difference, obtains pixel residual values, obtains current group of pixels amount according to quantization parameter operation
Change residual values；Using quantization parameter QP value, 2 power operations are done, multiple pixel residual errors are obtained using binary addition and displacement
The calculating of the quantized value of value, prediction residual value is completed within a clock cycle.Wherein quantization parameter QP value, by quantization level q,
It inquires to obtain by the quantized value table for being computed and having stored.
The difference rebuilds module 106, connects the quantization modules 105, works as what is obtained according to quantization modules 105
The pixel predictors currently organized that preceding group of pixel quantization residual values and prediction module obtain calculate, and are calculated and are obtained according to quantization parameter
The reconstructed value of current group of pixels；I.e. according to the size of multiple prediction quantization residual errors, one group of pixel quantization residual values and picture are selected
This group of pixel quantization residual values are sent to entropy code module 110 by plain predicted value.Wherein, using the specific model selection of DSC
Algorithm determines that, using one of MMAP, BP or the MPP prediction mode in prediction module 104, it is right under selected prediction mode to obtain
The one group of pixel quantization residual values and one group of predicted pixel values answered calculate, and obtain the reconstructed value of current group of pixels.
The color history index module 107, link control module 103 are used for history according to the pre-stored data
Pixel reconstructed value and the raw pixel data extracted of control module compare, obtain the reconstruction that color history indexes lower pixel
Value and pixel index value；For example, color history index module is from obtaining register in original pixels and module in control module 103
In pixel be compared after obtained most like pixel value, storage address, that is, index value of the pixel is sent to entropy coding mould
Block 110, and the pixel in register in module is updated.
The flatness detection module 108, link control module 103, for original to what is currently organized in control module
Flat or complex situations where pixel are judged, flatness signal is obtained；
The rate control module 109 connects flatness detection module 108, for according to flatness signal and entropy coding mould
The QP value that the bit number that block 110 exports the code stream of one group of entropy coding data is currently organized is adjusted；Such as pass through flatness
Detection module 108 obtains the minimax section of QP value, rebuilds the prediction residual size that module 106 obtains in conjunction with difference, passes through
It calculates, the size of dynamic adjusting quantization parameter QP value is transported to current QP value at next group of pixel coder, in complex region
Using larger QP value, smaller QP value is used in flat site, coding output is made to keep a more stable rate.
The row cache module 111, the reconstructed value and color of the current group of pixels for obtaining difference reconstruction module 106
The pixel reconstructed value that history index module 107 obtains, the reconstructed value of pixel under one of mode is taken using selection algorithm, is used
Ping-pong operation mode carries out data storage；Data storage device is written into a kind of reconstructed value of pixel of selection, is deposited using two
With ping-pong operation mode data storage device is written in reconstructed value by storage device, to use to subsequent pixel prediction, controls mould
Block 103 reads the data of needs from the pixel reconstructed value of storage.
The entropy code module 110, connection difference rebuild module 106 and color history index module 107, for working as
The pixel index value that preceding group of pixel quantization residual values and color history index module obtain is separately encoded, and two kinds of codings are obtained
Data, and select one of coding mode to export corresponding coded data by calculating；For example, pixel quantifies residual values through difference
Value rebuilds after module 106 selects and obtains adopted residual values, and pixel obtains pixel rope after color history index module 107
Draw value, pixel is quantified residual values to entropy code module 110 and pixel index value is encoded separately, then carries out selecting one of coding
Mode exports.
The code stream multiplex module 112 connects entropy code module 110, the entropy for exporting according to entropy code module 110
Coded data, obtains the compressed data stream of tri- components of Y, CO, Cg, and will be by the data flow multiplexing of three components through certain rule
It is exported at a group data stream；
The rate caches fifo module 113, for the group data stream that code stream multiplex module export cache and according to
It is exported after storage order splicing.
Fig. 2 is that the structure of the middle color history index module 107 of the system for implementing hardware of DSC provided by the invention coding is shown
It is intended to.As shown in Fig. 2, the color history index module specifically includes: color historical storage module 201, difference calculating module
202, index value searching module 203, maximum accidentally value computing module 204.Concrete operations are in embodiment, when DSC hardware is compiled
After code system initialization, when storing the used 32 groups of pixel reconstructed values of history in color historical storage module 201, and pressing use
Between sequencing arrange from top to bottom, raw pixel data be input to difference calculating module 202 carry out with color historical storage
The 32 groups of pixel reconstructed values stored in module 201 carry out absolute difference computation respectively, and the difference being calculated enters index value lookup
Module 203 obtains the group and its corresponding index value of minimal difference by comparing, and index value is input to maximum accidentally value and is calculated
In module 204；The corresponding pixel value of index value that value computing module 204 will obtain maximum accidentally as pixel reconstructed value, and
The raw pixel data being input in color history index module 107 after reading with control module 103 makes the difference, to three in one group
The error of a pixel is compared to obtain wherein worst error value, and tri- components of Y, Co, Cg are operated respectively, the picture that will be obtained
Plain index value, worst error value are exported to entropy code module 110, and pixel index value is used for next code, and worst error value is passed through
The signal for whether using ICH coding mode is calculated, pixel reconstructed value is passed through into selector, passes through ICH coding mode signal
Selection determine whether to be input in row caching 111 for next group of predictive coding.
Wherein, the color historical storage module 201 obtains the reconstructed value of upper one group of pixel by control module 103, weight
Built-in value is stored in the register that a depth is 32 in module, which deposits 32 and be the most recently used reconstruction pixel value, most
The data being newly stored in are placed on top, and other pixel values in register successively move down, lowermost end data with new pixel value into
Enter and remove register, if upper one group of coding mode is finally ICH mode, the corresponding pixel value of index value is advanced in register
Top corresponds to the pixel value in register less than index of reference value and successively moves down；The difference calculating module 202 calculates input
Current group of original pixel value and register in 32 groups of pixel values do the signed magnitude arithmetic(al) of difference respectively；
The index value searching module 203 passes through public affairs according to the original pixel value of input and subtracting each other in ICH register one by one
The weighting SAD that formula calculates each group of acquisition finds out three pixels in current group by quickly comparing for 32 groups of weighting sad values
Corresponding minimum sad value successively finds out number manipulative indexing value according to the value size of index value respectively in register
The smallest pixel value is as reconstructed value, wherein 32 group index value value ranges are the integer value that " 0 " arrives " 31 ".
In the system of the present embodiment, flatness detection module 108 includes two flatness detection modules, by same a line
Neighborhood pixels carry out maxima and minima searching, difference between the two is compared with specific threshold, determines flatness class
Type, a module are operated for currently organizing with previous group data, another module is to same in current group and later group pixel
Shi Jinhang detection obtains the signal results that flatness determines by signal decision module to the synthesis of two module testing results.
Fig. 3 is the structural representation that module 109 is drawn in code rate control in the system for implementing hardware of DSC provided by the invention coding
Figure.As shown in figure 3, the code rate control is drawn module and is specifically included: sky full degree module 301, linear transformation module 302, advantage
Parameter selecting module 303, short item QP value adjust module 304.Concrete operations are that the hardware of this DSC coding is real in embodiment
Code rate control, which is drawn after module receives previous group number of coded bits, in existing system starts to work, and the full degree module 301 of sky is according to entropy
The bit number and currently organize the ratio to be compressed for encoding and getting that the code stream for upper one group of entropy coding data that coding module 110 exports obtains
Special number is calculated, and corresponding empty full scale is provided, which is input to linear transformation module 302；302 basis of linear transformation module
An empty full scale value in certain section is obtained after empty full scale conversion, advantage parameter selecting module 303 carries out section ratio to the value
To the bound for determining QP value, flatness signal that the short item QP value adjustment module 304 is obtained according to pixel group and QP value
The QP value that bound is currently organized accordingly adjusts.
Fig. 4 is the flow chart that code rate control is realized in the system for implementing hardware of DSC provided by the invention coding, such as Fig. 4 institute
Show, realize that the process of code rate control includes: step 401, step 402, step 403 and step 404, detailed process is as follows:
Step 401, initiation parameter.DSC coded system is started to work, and first sets buffer-empty according to input picture digit size
The initial value of full initial value, quantization parameter QP value is set as 0.
Step 402, DSC compressed encoding is carried out to current group.The each pixel currently organized for treating packed pixel carries out DSC
Compressed encoding: obtaining the pixel predictors of the group according to the reconstructed value of the adjacent pixel of current pixel first, by predicted value and works as
Preceding original pixels, which make the difference, obtains a pixel residual values, is then quantified with current quantization parameter to the residual values, is obtained
Current group of pixels quantifies residual values, then carries out mapping or using color history indexed mode to current group of pixels quantization residual values
Obtain index value, by after mapping residual values and index value encode, the coding currently organized is recorded during coding
Number of bits.
Step 403, empty full linearisation conversion.After having compressed i-th group, according to i-th group of coded-bit number to buffering
The sky in area expires degree and carries out linearization calculation, and the comparison of threshold interval bound is carried out by the empty full degree of the linearisation after calculating
Obtain longer term parameters.
Step 404, further progress short term parameters QP is adjusted.It is combined with the complexity of the picture material of adjacent i+1,
Adjustment obtains new quantization parameter QP value, and obtained QP value is restored in the DSC compressed encoding link of a new round, mistake obtained
True quantization parameter can make the code rate of i+1 code set reach approximately target bit rate.
Fig. 5 is the structural schematic diagram of entropy code module in the system for implementing hardware of DSC provided by the invention coding.Such as Fig. 5
Shown, entropy code module includes: to check that computing module 501, predicted size module 502, DSU_VLC coding module 503, ICH are compiled
Code module 504, selecting module 505.Concrete operations are that entropy code module reads the current group of pixels after quantization in embodiment
Quantify residual values as the input for checking module 501 is calculated, by the size to pixel quantization residual values come calculation code length,
Achieve the purpose that data compression.The code length obtained after being computed is sent to ICH coding module 504 and DSU_VLC coding module
In 503, corresponding coding is carried out by classification to 3 pixel index values of input in ICH coding module 504, according to different points
Amount, by the way of being spliced to Y-component using " prefix+suffix ", to Co, Cg component is compiled only with the mode of index value
Code, obtains the coded data of index value；In DSU_VLC coding module 503, using two data paths, including coded data
With encoded data bits length, bit length is used for bit stream character combination into continuous bit stream, according to code length and
One residual error data of number and loading of " 0 " in its prefix length acquired for previously having organized coding mode relevant information
Bit number, according to information above come calculation code data.DSU_VLC coding module 503, according to calculated code length to working as
The coded data of preceding group of each pixel quantization residual values coding acquisition current group of pixels quantization residual values, three of current group of pixels
Y, Co, Cg component are independently operated；Residual values size is quantified according to the pixel of the group in predicted size module 502 and carries out ruler
Very little prediction is inputted as next group of inspection computing module, and respective component individually carries out.The coded data that two methods obtain
One of entropy coding data in DSU_VLC coding or ICH coding mode are exported after the selection of selecting module 505, are obtained
Encoded data stream.
Preferably, rate described in present system caches fifo module 113, for the code being stored in buffer after coding
Stream is that the group data stream that code stream multiplex module 112 exports is stitched together according to storage order, and determines the data of entropy coding
Whether remaining bits meet splicing output condition after stream length and last time splicing, and the splicing output condition is data code flow splicing
It is 48 full；When data flow splicing is 48 full, it is output to outside DSC encoder, 48 bit positions that will be had more in data flow
It remains, as the remaining bits spliced next time.
Fig. 6 is the flow chart of the hardware implementation method of DSC provided by the invention coding；The present invention also proposes that a kind of video is aobvious
Show the hardware implementation method of stream compressed encoding, as shown in Figure 6, comprising: step 601, step 602, step 603 and step 604.Tool
Body is as follows:
The pixel to be compressed that step 601, converting transmission come.By the video source pixel of the coding rgb format to be compressed of input, turn
It turns to the pixel data of YCoCg format needed for compressed encoding and will be cached as raw pixel data；Color space conversion
Module 101 will transmit the conversion on the image pixel click-through row format for coming in need to compress, wherein the image data inputted can wrap
One or more pictures are included, in some cases, picture can be described as video " frame ".In some instances, DSC encoder can will scheme
Piece is divided into multiple slices, to every a piece of execution encoding operation.
Step 602, treat packed pixel predicted, quantified, being rebuild or color history index；It is specific as follows:
(1) during packed pixel initialization, packed pixel reading caching is treated, buffer area sky full scale will is initialized, and waited
Wait start the control signal of prediction.
(2) when predicting, quantify, rebuilding pixel, new pixel to be compressed is predicted, selects to correspond to according to prediction mode
Reconstructed value calculated, by being made the difference with original pixel value, and with quantization parameter QP carry out shifting function obtain quantization residual error,
Quantify residual error is indicated using complement form, selects which kind of prediction mode according to certain decision mechanism judgement, residual under the mode
Difference is added to obtain reconstructed value with predicted value, carries out flatness judgement to original pixels at the same time, QP value is adjusted, to influence
Quantify residual values；
The process specifically: extraction obtains extracting the reconstruction for obtaining predicting required adjacent pixel in raw pixel data, and caching
Value；According to the control signal for compressed encoding of generation, is calculated and obtained currently by the reconstructed value of the adjacent pixel of current pixel
The pixel predictors of group；The pixel predictors currently organized and raw pixel data are made the difference and obtain pixel residual values, according to quantization
Parameter operation obtains current group of pixels and quantifies residual values；The pixel for quantifying residual values according to the current group of pixels of acquisition and currently organizing
The reconstructed value of predictor calculation acquisition current group of pixels；
The pixel reconstructed value and raw pixel data that history according to the pre-stored data uses compare, and obtain color history index
Under pixel reconstructed value and pixel index value；By the pixel weight under the reconstructed value of the current group of pixels of acquisition and color history index
Built-in value is taken the reconstructed value of pixel under one of mode using selection algorithm, and carries out data storage using ping-pong operation mode；
For example, receiving the reconstruction pixel for having completed processing, the predicted value currently organized, predicted value are calculated according to certain calculation
It enters in quantization modules and goes compared with raw pixel data, and obtain quantization residual values with quantization parameter, quantify residual values
With pixel predictors by reconstructed value is calculated.It is stored in original pixels and color history index module in this course
Pixel value is compared, and is found closest pixel and is exported its corresponding index value, and completes color history index storage mould
Pixel in block updates.Also, the flat case where the original pixels currently organized can also be judged, obtain flatness
Signal；Current group QP value is carried out according to the bit number of flatness signal and the code stream of upper one group of entropy coding data to adjust.
(3) color history index with prediction, quantization, reconstruction carries out simultaneously, according to the original pixel value of input with make recently
The smallest value of used pixel value weighting SAD is used as predicted value, looks for the position i.e. index value of its corresponding most like pixel, looks into
After inquiry, the calculating of color history index is completed, and is updated to corresponding index historical storage module, and to index value into
Row output；
Step 603, to treated, pixel carries out entropy coding, obtains to pixel quantization residual values and color history index module
Pixel index value is separately encoded, and two kinds of coded datas are obtained, and selects one of coding mode output to correspond to by calculating
Coded data；Quantify residual values and index value according to receiving the current group that previous step obtains, entropy code module 110
It is different according to the data of input, the code stream of two kinds of coded datas is obtained using different coding modes, according to certain decision mechanism
Which kind of coding mode judgement uses, and selects the code stream output of one of coding, and output code flow includes two groups of data, and one group is to compile
The data of code, another group is the length encoded.
During being somebody's turn to do, quantization residual values and index value to input determine the front and back of this group according to upper one group of type of coding
Sew size and prefix code field, if suffix is to quantify residual values to take out corresponding quantization from storage table according to suffix size
Residual error truncation digit is spliced, if suffix is index value, is directly indicated with 5 digits.
Step 604, to caching compressed data and exporting, i.e., the entropy coding data exported according to entropy code module obtain
To the compressed bit stream of tri- components of Y, CO, Cg, and by the code stream multiplex of three components at a group data stream, and carry out caching and by
It is exported after splicing according to storage order.Judge spliced data length with last time splicing after remaining bits whether meet splicing it is defeated
Condition out, satisfaction then export this group of code stream, otherwise remain the data beyond splicing output condition in data flow as under
Whether the remaining bits once spliced, i.e., the sum of code stream length after being encoded and remaining bits digit after time splicing are greater than
48, if more than 48, then last time spliced remaining code stream displacement is spliced into the output of 48 bit data streams with current code stream, it is extra
Part is retained as the remaining bits of next group of splicing with register.
To sum up, the system for implementing hardware and method of video of the invention display stream compressed encoding, can effectively improve image pressure
The processing speed of contracting, while the compression of images performance of DSC encoder is remained, meet the needs of display link bandwidth, has complete
The good feature of assembly line, real-time, is easy to the realization of field programmable gate array.
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode within the knowledge of a person skilled in the art can also be without departing from the purpose of the present invention
It makes a variety of changes.
Claims (10)
1. a kind of system for implementing hardware of video display stream compressed encoding characterized by comprising
Color-space conversion module, for converting compressed encoding for the video source pixel of the coding rgb format to be compressed of input
The pixel data of required YCoCg format；
Picture element caching module, for using the pixel data of YCoCg format obtained by color-space conversion module as original image prime number
According to being cached；
Control module obtains raw pixel data for extracting from picture element caching module, and Ji Conghang cache module extracts to obtain pre-
The reconstructed value of adjacent pixel needed for surveying, and generate the control signal for being used for compressed encoding；
Prediction module, for being used for the control signal of compressed encoding according to produced by control module, by the adjacent picture of current pixel
The reconstructed value of element calculates the pixel predictors for obtaining and currently organizing；
Quantization modules, the raw pixel data for extracting the pixel predictors currently organized and control module make the difference acquisition pixel
Residual values obtain current group of pixels according to quantization parameter operation and quantify residual values；
Difference rebuilds module, and the current group of pixels quantization residual values and prediction module for obtaining quantization modules obtain current
The pixel predictors of group calculate the reconstructed value for obtaining current group of pixels；
The original that color history index module, the pixel reconstructed value used for history according to the pre-stored data and control module are extracted
Beginning pixel data compares, and obtains reconstructed value and pixel index value that color history indexes lower pixel；
Row cache module, for difference to be rebuild to reconstructed value and the color history index module institute of the current group of pixels that module obtains
The reconstructed value of pixel is obtained, the reconstructed value of pixel under one of mode is chosen, and data are carried out using ping-pong operation mode and are deposited
Storage；
Entropy code module, for current group of pixels quantify pixel index value that residual values and color history index module obtain into
Row is separately encoded to obtain two kinds of entropy coding data, and selects one of coding mode to export corresponding entropy coding number by calculating
According to；
A kind of code stream multiplex module, entropy coding data for being exported according to entropy code module, obtains tri- components of Y, CO, Cg
Compressed data stream, and the data flow multiplexing of three components is exported at a group data stream；
Rate caches fifo module, for carrying out caching to the group data stream that code stream multiplex module exports and according to storage order
It is exported after splicing.
2. the system for implementing hardware of video display stream compressed encoding according to claim 1, it is characterised in that: further include flat
Detection module and rate control module are spent, wherein flatness detection module, for the original pixels currently organized in control module
Flat case where data is judged, flatness signal is obtained；The rate control module, for according to flatness signal
Current group QP value is carried out with the bit number that entropy code module exports upper one group of entropy coding data to adjust.
3. the system for implementing hardware of video display stream compressed encoding according to claim 2, it is characterised in that: the code rate control
Molding block includes that sky completely degree module, linear transformation module, advantage parameter selecting module, short item QP value adjust module, hollow
Full degree module, the bit number of upper one group of entropy coding data for being exported according to entropy code module and currently organizes volume to be compressed
The bit number that code is got is calculated, and sky full scale is obtained；The linear transformation module, for being converted to centainly according to empty full scale
An empty full scale value in section；The advantage parameter selecting module compares determining QP for carrying out section according to empty full scale value
The bound of value；The short item QP value adjusts module, for what is currently organized according to the bound of flatness signal and QP value
The adjustment of QP value.
4. the system for implementing hardware of video display stream compressed encoding according to claim 1, it is characterised in that: the color is gone through
History index module includes color historical storage module, difference calculating module, index value searching module, maximum accidentally value computing module,
Wherein difference calculating module, the pre-stored history of raw pixel data and color historical storage module for that will input use
Pixel reconstructed value carry out absolute difference computation, obtain difference；The index value searching module, for being obtained according to difference calculating module
To difference comparsion obtain the group and its corresponding index value of minimal difference；The maximum accidentally value computing module, is used for rope
Draw the corresponding pixel value of index value that value searching module obtains to make the difference as pixel reconstructed value and with raw pixel data, to one group
In the errors of three pixels be compared to obtain wherein worst error value, and by gained index value, worst error value export to
Pixel reconstructed value is determined whether to be input in row cache module by entropy code module by selector selection.
5. the system for implementing hardware of video display stream compressed encoding according to claim 1, it is characterised in that: the entropy coding
Module includes checking computing module, predicted size module, DSU_VLC coding module, ICH coding module, selecting module, wherein examining
Computing module is looked into, for quantifying residual values calculation code length according to the current group of pixels of input；The ICH coding module is used
In being encoded to obtain the coded data of index value to the index value of input；The DSU_VLC coding module, for according to calculating
Code length out obtains the coded data of current group of pixels quantization residual values to each pixel quantization residual values coding is currently organized；
The coded data for the current group of pixels quantization residual values that the predicted size module is used to be exported according to DSU_VLC coding module is big
The small size prediction that carries out is inputted as next group of inspection computing module；The selecting module, for the coded number from index value
According to selecting one kind in the coded data with current group of pixels quantization residual values and export.
6. the system for implementing hardware of video display stream compressed encoding according to claim 1, which is characterized in that the rate is slow
It deposits fifo module to carry out caching to the group data stream that code stream multiplex module exports and export after splicing according to storage order, specifically
Are as follows:
To code stream multiplex module output a group data stream splice according to storage order, and judge spliced data length with it is upper
Whether remaining bits meet splicing output condition after primary splicing, and satisfaction then exports the group data stream, and will exceed in data flow
The data of splicing output condition are remained as the remaining bits spliced next time.
7. the system for implementing hardware of video display stream compressed encoding according to claim 6, it is characterised in that: the splicing is defeated
Condition is that data code flow splicing is 48 full out.
8. a kind of hardware implementation method of video display stream compressed encoding, which comprises the following steps:
By the video source pixel of the coding rgb format to be compressed of input, it is converted into the pixel number of YCoCg format needed for compressed encoding
According to and will cache as raw pixel data；
Extraction obtains extracting the reconstructed value for obtaining predicting required adjacent pixel in raw pixel data, and caching；According to generation
For the control signal of compressed encoding, the pixel prediction for obtaining and currently organizing is calculated by the reconstructed value of the adjacent pixel of current pixel
Value；
The pixel predictors currently organized and raw pixel data are made the difference and obtain pixel residual values, are obtained according to quantization parameter operation
Current group of pixels quantifies residual values；The pixel predictors for quantifying residual values according to the current group of pixels of acquisition and currently organizing calculate,
Obtain the reconstructed value of current group of pixels；
The pixel reconstructed value and raw pixel data that history according to the pre-stored data uses compare, and obtain color history index
The reconstructed value and pixel index value of lower pixel；The reconstructed value of the current group of pixels of acquisition and color history are indexed to the weight of lower pixel
Built-in value takes the reconstructed value of pixel under one of mode, carries out data storage using ping-pong operation mode；
Quantify the pixel index value that residual values and color history index module obtain to current group of pixels to be separately encoded to obtain
Two kinds of entropy coding data, and select one of coding mode to export corresponding entropy coding data by calculating；According to output
A kind of entropy coding data, obtain the compressed data stream of tri- components of Y, CO, Cg, by the data flow multiplexing of three components at one group of number
According to stream, and cache and exported after splicing according to storage order.
9. the hardware implementation method of video display stream compressed encoding according to claim 8, it is characterised in that: the method is also
Including judging the flat case where the original pixels currently organized, flatness signal is obtained；According to flatness signal and
The QP value that the bit number of upper one group of entropy coding data is currently organized is adjusted.
10. the hardware implementation method of video display stream compressed encoding according to claim 8, it is characterised in that: the method
It further include splicing to a group data stream according to storage order, and judge remaining ratio after spliced data length and last splicing
Whether spy meets splicing output condition, and satisfaction then exports the group data stream, and the number that will exceed splicing output condition in data flow
According to remaining as the remaining bits spliced next time.
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