WO2012088811A1

WO2012088811A1 - Motion prediction method and system for inter frame encoding

Info

Publication number: WO2012088811A1
Application number: PCT/CN2011/073504
Authority: WO
Inventors: 舒倩
Original assignee: 深圳市融创天下科技股份有限公司
Priority date: 2010-12-28
Filing date: 2011-04-29
Publication date: 2012-07-05
Also published as: CN102547264B; CN102547264A

Abstract

A motion prediction method and system for inter frame encoding are disclosed in the present invention, wherein the motion prediction method for inter frame encoding includes the steps of judging whether to start the global motion prediction firstly according to the threshold range which relative variation complexity information of the current frame is located in; if the global motion prediction is performed, judging whether the selected judgment area has the strong consistency motion tread, if so, obtaining the motion direction of the current frame as the global motion direction, and obtaining corresponding direction judgment; if it does not have the strong consistency motion tread, performing the weak judgment for the global motion direction according to the motion of each area. The present invention can improve the compression ratio on the one hand, and improve the compression speed on the other hand. Namely, when the compression is performed on the video resource with the global motion, the motion judgment can be determined by using uniformly judgment manner, without successively judging sub blocks of each macro block as in the motion prediction method only depended on the macro blocks and the sub blocks.

Description

Motion prediction method and system for interframe coding

Technical field

The present invention relates to the field of video coding, and in particular to a motion prediction method and system for interframe coding. Background technique

The inter-frame information redundancy of the video source in video coding is extremely large, which makes the inter-frame coding method particularly important in video coding. At present, the mainstream motion compensation method based on macroblock and sub-block can achieve better results in normal motion, but when global motion occurs, the corresponding compression difficulty is improved. This problem is more serious in low-rate compression. . This problem is caused by the complexity of the encoding source itself, but on the other hand, it is also the cause of the existing macroblock-based and sub-block motion compensation methods. The motion compensation method based on macroblock and subblock splits the region and the global correlation, so that when there is global motion, the redundancy of the interframe information can not be eliminated well by using this method, so that the low bit rate is The contradiction between compression quality and quantity is particularly prominent. In addition, the decision-by-decision mode wastes computing resources. Summary of the invention

The purpose of the embodiments of the present invention is to provide a motion prediction method for inter-frame coding, which aims to solve the prior art method for motion compensation based on macroblock and sub-block, which separates regions and global correlations, so that when there is global motion, The redundancy of the inter-frame information cannot be well eliminated, so that the contradiction between the compression quality and the quantity at a low code rate is particularly prominent.

The method of the embodiment of the present invention is implemented in this manner, and provides a motion prediction method for inter-frame coding, where the method includes:

Determining whether to enter the global motion prediction according to the threshold range in which the relative change complexity information of the current frame is located, and if so,

Determining whether the selected decision area is a strong consistent motion trend, and if so,

Get the current frame as a global motion, obtain the corresponding direction decision, and end.

Preferably, the step of "determining whether the selected determination area is a strong consistent motion trend" further includes: If the selected region is not a strong consistent motion trend, a weak determination of the global motion direction is performed according to the motion of each region.

Another object of the embodiments of the present invention is to provide an interframe coding motion prediction system, where the system includes an entry global motion prediction judgment module, a strong consistency motion trend judgment module, and a weak consistency motion trend judgment module, where

The entering the global motion prediction and determining module is configured to determine whether to enter the global motion prediction according to the threshold range in which the relative change complexity information of the current frame is located; that is, if the relative change complexity information of the current frame is greater than the first threshold, the current The frame is extremely similar to the previous frame, and the current frame is determined to be a skip frame, and the skip frame indicates that there is almost no motion compared to the previous two frames; if the relative change complexity information of the current frame is between the first threshold and the second threshold And not entering the global motion prediction, wherein the first threshold is greater than the second threshold; if the relative change complexity information of the current frame is smaller than the second threshold, performing global motion prediction, entering the strong consistency motion The trend judgment module executes;

The strong consistency motion trend judging module is configured to determine whether the selected judging area is a strong consistent motion trend, and if yes, obtain the current frame as a global motion, and obtain a corresponding direction determination; if otherwise enter the weak consistency The motion trend judgment module executes;

The weakly consistent motion trend judging module is configured to determine whether the selected judging region is a weakly consistent motion trend, and if yes, obtain a corresponding direction determination of the current frame; if otherwise, determine that the current frame does not have a global motion.

The invention has the following beneficial effects: The present invention proposes a motion prediction method for inter-frame coding, which first determines whether to enter global motion prediction according to a threshold range in which the relative change complexity information of the current frame is located; Whether the selected determination area is a strong consistent motion trend, if yes, the motion direction of the current frame is taken as the global motion direction, and the corresponding direction determination is obtained, and the end is ended; if it is not a strong consistent motion trend, according to the motion of each area, A weak decision on the direction of global motion. The invention can improve the compression ratio on the one hand and the compression speed on the other hand, that is, when compressing the video source with global motion, the motion prediction can be determined by means of unified judgment, without relying on relying only on macroblocks and sub- The motion prediction method of the block sequentially determines each macroblock subblock. DRAWINGS

1 is a flowchart of a motion prediction method for interframe coding according to an embodiment of the present invention; 2 is a schematic structural diagram of a motion prediction system for inter-frame coding according to an embodiment of the present invention. The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. For the convenience of description, only the parts related to the embodiments of the present invention are shown. . It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The invention provides a motion prediction method for inter-frame coding, which first determines whether to enter a global motion prediction according to a threshold range in which the relative change complexity information of the current frame is located; if it is a global motion prediction, it is determined whether the selected decision region is Strong consistent motion trend, if yes, obtain the motion direction of the current frame as the global motion direction, obtain the corresponding direction decision, and end; if it is not the strong consistent motion trend, perform the weak decision of the global motion direction according to the motion of each region. By using the method of the invention, the compression ratio can be improved on the one hand, and the compression speed can be increased on the other hand, that is, when the video source with global motion is compressed, the motion prediction can be determined by means of unified judgment, without relying on relying only on macroblocks only. The sub-block motion prediction method sequentially determines each macro block sub-block. FIG. 1 is a flowchart of a motion prediction method for inter-frame coding according to an embodiment of the present invention, where the method includes the following steps:

S11. Determine, according to a threshold range in which the relative change complexity information of the current frame is located, whether to enter the global motion prediction.

Specifically, if the relative change complexity information of the current frame is greater than the first threshold, the current frame is considered to be extremely similar to the previous frame, and the current frame is determined to be a Skip frame (ie, a frame skipping, indicating that the two frames are nearly motionless, Directly copying the previous frame image); if the relative change complexity information of the current frame is between the first threshold and the second threshold, the global motion prediction is not entered; if the relative change complexity information of the current frame is less than the second threshold, Then, the global motion prediction is entered, that is, the process proceeds to step S12. The first threshold is greater than the second threshold. The procedure for entering the global motion prediction method is as follows: if(ti fr a rq^sThrfe); Then the t-th frame is extremely similar to the t-1 frame, and the t-th frame is determined to be a Skip frame.

If (tis _ frames^ <Thres2)

Forecast using global motion prediction method

If (Thres2<tis_ frame^ < hresl)

Then there is no global motion trend, and the motion prediction based on macroblock and block is entered. Where: Thresl Thres2 is the corresponding first threshold and second threshold decision threshold.

Tis_ framest represents: relative change complexity information of the t-th frame;

The relative change complexity information of the current frame is obtained as follows:

A): extracting relative change complexity information of each macroblock according to macroblock motion information and macroblock texture information; a) macroblock motion information: pixel values in the current macroblock and the corresponding macroblock in the previous frame

The mean square error of the difference.

Ti- Mb _t , = std[ f _t (i,jl(i,j)e Mb _t , )― f _t _, (i,jl(i,j)e Mb _t — ,' b) macroblock texture information : The mean square error of the pixel values within the current macroblock. Si— Mb _t , _m , _n =std[f _t (i,jl(i,j) _e Mb _t , if(Si_Mb _t , _m , _n =0) s |J, determine that the current macroblock is a single-point macroblock , that is, all pixel values of the entire macroblock are the same pixel value;

C) Macroblock relative change complexity information:

Mb, ^ represents the macroblock of the mth row and the nth column of the tth frame;

Representation; macroblock of the _mth row and _nth column of the _t-1th frame; f _t ( ) represents the pixel value of the i th row j column of the tth frame; f _t (i, j I (i, j ) e Mb _{t mi} J Representation; indicates the pixel value of the i-th row and j column belonging to ^, I in the t-th frame; f _t — i'j Ki'j)^— J: Image of the i-th row and j-th column belonging to ¹ ^ " in the _t -1th frame

Std table uneven variance; ti-Mb represents: macroblock motion information;

si_Mb _t represents: macroblock texture information; B): acquires relative change complexity information of the current frame based on macroblock relative change complexity information

[coun^ ++ , tis_Mb _tmn < ThresO

Tis_ frames _t = <''

Coun^ , else where: ThresO is the corresponding zeroth decision threshold;

tilMb means: Mb macroblock relative change complexity information

S12, determining whether the selected determination area is a strong consistent motion trend, if yes, acquiring a motion direction of the current frame as a global motion direction, obtaining a corresponding direction determination, and ending; if otherwise, proceeding to step S13; Condition:

Condition 1: The decision area is the background area;

When there is global motion, there is generally a consistent trend in background motion, while the foreground generally has the characteristics of relative motion;

Condition 2: Select at least two decision areas;

Condition 3: Detection of all directions in each decision area;

All directions include: left side motion, right side motion, upper side motion, lower side motion, static;

In the specific implementation, more or less directions can be selected according to the comprehensive consideration of the needs and the calculation amount. Considering that the three movements of horizontal, vertical and stationary are the most common in actual exercise, the embodiment of the present invention The five directions of left side motion, right side motion, upper side motion, lower side motion, and stationary are explained as an example. "Determining whether the selected decision area is a strong consistent motion trend"

S121: Obtain a macroblock prediction direction in the determination area by using a macroblock as a unit;

II

In the embodiment of the present invention, two determination areas Region^Re _g i are selected. For the macroblocks in the decision area Region^Regioi^, the following calculations are respectively performed: Calculate the mean square error of the left motion prediction value and the current coded value difference, obtain the left motion prediction residual; Calculate the right motion prediction value and The mean square error of the current coded value difference, obtains the right motion prediction residual; calculates the mean square error of the upper motion prediction value and the current coded value difference, obtains the upper motion prediction residual; calculates the lower motion prediction value and the current coding The mean square error of the difference value is obtained, and the lower side motion prediction residual is obtained; the mean square error of the static predicted value and the current coded value difference is calculated, and the still motion prediction residual is obtained; the specific calculation formula is as follows: diff _Left = - predL - f t- _Λ l,m , ,n (i,j)I b _t , _m , _B G Re gioi^ Re gioi^ ] d ^iff Right = std[f _t , _m , _n (i,j) - predR_ - f t- ,l,m ,, , _n (i,j)I b _t , _m _N G Re gio3⁄4 uRegionJ diff _Up = std[f _t , _m , _n (i,j)_ predU_ f tl,m ,n (i, j) I b _t , _m , _n G Re gioi^ Re gioi^ ] d ^iff Dow„ = std[f _t , _m , _n (i,j) - prec© ― f t- ,l,m , , _n ( i,j)IMb _t , _NN G Re gioi3⁄4 uRegionJ diff _Static - p redS— f ,(i,j)I b ₍ G Re gior^ Re gio ]

Where: Mb _t ' _m ' _n represents the macroblock of the mth row and n columns of the tth frame; —: is the macroblock of the mth row and the nth column of the current t frame; f'- ⁽ⁱ ' ^j) : is ^ The pixel value of the i-th row and the j-th column;

f _t ( ) represents the pixel value of the i-th row and j column of the t-th frame; the std table is unevenly variance; 13 is the left-side motion prediction residual, predL_f _t . j) is the current frame image using the current frame The macroblock is the predicted value of the left motion estimation;

Diff^ht is the right side of the page; the predR_ f , , , (i, j) is the current image using the previous frame

^Pr6dU - ^(ί ' ^j) is to use the previous frame image for the current

precD_ f , , . (i, j) is a predicted value for estimating the motion of the current macroblock using the image of the previous frame;

Diff _statl . Predicting the residual for the stationary motion; predS _ f _t _ _tn (i, j ) is the predicted value of the stationary motion estimation of the current macroblock using the image of the previous frame;

S122: Count the number of motion macroblocks in all directions in each area; that is, in each area, the number of motion macroblocks in the direction in which the macroblock prediction residual is the smallest is increased by one; all directions in each area are left motion, right motion, Upper side movement, lower side movement, static direction;

The specific procedures for the statistical method of the number of motion macroblocks in each area are as follows:

If

)

Count„ + +

If

, diff _Up , diff _DowDt , diff _Static ) = diff _Kght )

County" + +

If

, diff _Static ) = ddi _p )

Count _{Up j} + +

If

, diff _Static ) = diff _Downt )

County , + +

If

, diff _Up , diff _DowDt , diff _Static ) = diff _Static )

Count, _wicJ + + among them,

, Count _{Up j} , Οηπ3⁄4 Count^c" respectively indicate the left side of the selected decision area Regies, the right side motion, the upper side motion, the lower side motion, and the number of still macroblocks. When j is equal to 5 or 6, ^{Re giQn} j represents two different selected decision regions; min(a, b, c, c, d) represents the minimum of the five values;

S123: determining, according to the statistical information of the number of motion macroblocks in the corresponding direction in each area, whether the information of the area is available;

That is, if the difference between the number of macroblocks in the opposite direction of motion in one region is smaller than the first direction determination threshold Thres _dl or the five motion directions in the region (left side motion, right side motion, upper side motion, lower side motion, still motion) If the difference between the maximum value and the second largest value of the macroblock number is smaller than the second direction determination threshold l3⁄4re _Sd2 , the information of the area is considered to be unavailable.

The detailed procedure is as follows:

If (absCCount^ j - Count _{Right j} ) < Thres _dl 11 abs(Count _{Up j} - Count _D ) < Thres _dl II

maxCCount^ j ,Count _{Right j} ,Count _{Up j} ,Count _{Down j} ,Count _Static ^ ) - lessmaxiCount^ j ,Count _{Right j} ,Count _{Up j} ,Count _{Down j} ,0 dish] ) < Ihres^) 贝|J, Area information is not available

Among them, County j,

, Count _Down j , Counts^" respectively indicate the left side motion, the right side motion, the upper side motion, the lower side motion, and the number of still macroblocks of the selected decision region Region. When j is equal to 5 or 6, ^{Re gi} ° ⁿ j represents two different selected decision regions; ma _X ( _a , b, _C , _C , d), le _S smu a, b, c, c, d) respectively to find the maximum and the fifth of the five values A large value, hres _dl is a first direction determination threshold, and 13⁄4^ is a second direction determination threshold;

S124: Determine the motion direction according to the motion trend of the selected determination region, that is, the motion direction with the largest number of macroblocks in one region, determine the motion direction of the region; if (Region, valid), obtain the motion direction determination I^ft , maxCCount^ j ,Count _{Right j} ,Count _{Up j} , Count _D Count _Static ) = County

Right , maxiCount^ j ,Count _{Right j} ,Count _{Up j} ,Count _D ,Count _Static ^ ) = Count _{Kght j} directionj Up ,

= Count _Up ,

Down , maxCCount^ j ,Count _{Right j} , Gount _Up j , Count _D j , Coun^^ j ) = Count _D j

Static , max Count^ ,Count _{Right j} Count _Up 'County , Counts _{tatic j} ) = Count _{Static j} where directioiij is the direction of motion of the selected decision region Regionj, which is divided into the left direction of motion

Left. Right side motion direction Right, upper side motion direction Up, lower side motion direction Down, static Static; County j

, Count _{Up j} , Count _Down j , Count^c" respectively indicate the area Re gio left side motion, right side motion, upper side motion, lower side motion, number of still macroblocks, when j is equal to 5 or 6, ^{Re gi} ° ⁿ j represents two different selected decision regions; ma _X ( _a , b, _C , c, d) represents the maximum of the five values;

S125: performing strong determination of the global motion direction according to the motion of each region;

That is, the motion directions of the two regions are consistent and do not belong to the stationary direction, and the number of macroblocks in the corresponding motion direction of each region is greater than the corresponding third direction determination threshold Thres _d3 ; or the motion directions of the two regions are inconsistent but one of the regions is motion The number of macroblocks whose direction is stationary and the other non-stationary direction is greater than the corresponding fourth direction determination threshold hre _Sd4; then the global motion direction can be obtained, and the global motion prediction judgment is ended; otherwise, the process proceeds to S13.

If ((direction = directioi3⁄4&&directicn ₅ ≠ Static&&

Count _directlon] _ ₅ > _Thres _d3 &&Count _{d 6} > Thres _d3 ) ll

(direction≠ directioi% ) &&dii-ectioi% = Static&& _{Direct directi n 5} > _Thres _d4 ))

Directioi ^an = direction^ Get direction end global motion prediction judgment else

If (direction≠ direction ) &&directioi3⁄4 = Static&&Count _{direction 6} > lhres _d4 )) Directiof = direction, get direction end global motion prediction judgment otherwise, enter S13

Wherein directiof is the motion direction of the t-th frame, and Thre _Sd3 Thres _d4 is the third direction determination threshold and the fourth direction determination threshold respectively;

Directiorij J is the area Re gi. Direction of movement directioi% J-direction area Re g oiig direction of movement

Coun^ _—5 determines the region Re _g i. Number of macroblocks in the direction of motion

C Judgment area Number of macroblocks in the direction of motion of Re gies

S13, performing a weak determination of the global motion direction according to the motion of each region;

The specific method steps are as follows:

S131: Calculating the difference value mn of each type of area, that is, calculating the difference between the maximum moving direction macro number and the sub-large moving direction macroblock number of each area, and the minimum value of the same type area is the direction value of the type area;

If (Region5 Region ₆ is valid)

Mn = rmn(max(Count _Lett ,Count _{Right j} , Count _{Up j} ,Count _{Down j} , Coun ,^ _d ) - lessmax(Count _Lett ,Count _{Right j} ,Count _{Up j} ,Count _{Down j} ,Count _Static ”))

If (only Regio is valid)

Mn = minCmaxCCount^ , Count _{Right j} , Count _{Up j} , Count _{Down j} ^ou ,^ ) - lessmaxiCount^ , Count _{Right j} ,Count _{Up j} , Count _{Down j} 'County ))

If (only Reg is valid)

Mn = minCmaxCCount^ ,Count _{Right j} ,Count _{Up j} ,Count _Down 》 County,” ) - lessmaxiCount^ ,Count _{Right j} , Count _{Up j} ,Count _{Down j} , Coimt ” S132: determining the global motion direction according to various conditions of each region; if only one region of the two region information is valid, if the number of macroblocks satisfying the motion direction of the region is smaller than the corresponding fifth direction determination threshold 13⁄4^ and the region The direction difference value satisfies the corresponding sixth direction determination threshold Thr _eSd6; or the number of macroblocks satisfying the motion direction of the area is greater than the corresponding seventh direction determination threshold

Thres _d7 ; then the global direction of motion is the direction of motion of the active area; the detailed procedure is described as follows:

If ((Regioi^ only works & &

_{(Coun ^, 5 <lhres d5} &&mn> Thres d6) II (0 ΐιη ^ ∞ι1. Η5, 5> Thres d7)) II ( valid only Regioi ^ &&

(Coun^ ^ ,6 < l3⁄4re _Sd5 &&mn> l3⁄4res _d6 ) II (Coun^ ^ ,6 < Thres _d7 )))

Directioi ^frame = direction!, Regio |^ 3⁄4

Else

No global movement

The embodiment of the invention provides a motion prediction method for inter-frame coding, which first determines whether to enter global motion prediction according to a threshold range in which the relative change complexity information of the current frame is located; if it is a global motion prediction, determines the selected decision region. Whether it is a strong consistent motion trend, if yes, obtain the motion direction of the current frame as the global motion direction, obtain the corresponding direction decision, and end; if it is not a strong consistent motion trend, the global motion direction is weak according to the motion of each region determination. By using the method of the invention, the compression ratio can be improved on the one hand, and the compression speed can be increased on the other hand, that is, when the video source with global motion is compressed, the motion prediction can be determined by means of unified judgment, without relying on relying only on The macroblock and subblock based motion prediction method sequentially determines each macroblock subblock.

FIG. 2 is a schematic structural diagram of a motion prediction system for inter-frame coding according to an embodiment of the present invention. The system includes:

The global motion prediction and determination module is configured to determine whether to enter the global motion prediction according to the threshold range in which the relative change complexity information of the current frame is located; that is, if the relative change complexity information of the current frame is greater than the first threshold, the current frame is considered to be The previous frame is extremely approximate, and the current frame is determined to be a Skip frame (ie, a skip frame, indicating that the two frames before and after the motion is almost motionless, and the previous frame image can be directly copied); if the current frame has its relative change complexity information at the first threshold and the first Between the two thresholds, the global motion prediction is not entered; if the relative change complexity information of the current frame is smaller than the second threshold, the global motion prediction is entered, that is, the strong consistency motion trend judgment module is entered, where the first threshold is greater than the second threshold. .

Strong consistency motion trend judgment module: judge whether the selected decision area is a strong consistent motion trend, if yes, obtain the current frame as a global motion, obtain a corresponding direction determination, and end; if otherwise enter a weak consistency motion trend judgment module ;

"Determining whether the selected decision area is a strong consistent motion trend" is specifically:

Obtaining a macroblock prediction direction in the determination region in units of macroblocks;

Count the number of motion macroblocks in all directions in each region;

Determining whether information of the area is available based on statistical information of the number of motion macroblocks in corresponding directions in each area;

Determining all directions of motion based on the trend of motion of the selected decision zone;

According to the movement of each region, a strong judgment of the global motion direction is performed;

The weak consistency motion trend judging module judges whether the selected judging region is a weakly consistent motion trend, and if yes, obtains a corresponding direction judgment of the current frame, and ends; if otherwise, determines that the current frame does not have a global motion;

"Determining whether the selected decision area is a weakly consistent motion trend" is specifically: calculating the direction difference of each type of area, that is, calculating the difference between the maximum number of motion direction macroblocks and the sub-large motion direction macroblocks of each area, The minimum value of the region is the difference in direction of the region; that is, according to the various conditions of each region, the global motion direction is determined;

The various situations are:

If only two areas of the two area information are valid,

If the number of macroblocks satisfying the direction of motion of the region is less than the corresponding fifth direction determination threshold and The direction difference value of the region satisfies the corresponding sixth direction determination threshold; or the number of macroblocks satisfying the motion direction of the region is greater than the corresponding seventh direction determination threshold;

Then the global direction of motion is the direction of motion of the active area;

The embodiment of the invention provides a motion prediction method for inter-frame coding, which first determines whether to enter global motion prediction according to a threshold range in which the relative change complexity information of the current frame is located; if it is a global motion prediction, determines the selected decision region. Whether it is a strong consistent motion trend, if yes, obtain the motion direction of the current frame as the global motion direction, obtain the corresponding direction decision, and end; if it is not a strong consistent motion trend, the global motion direction is weak according to the motion of each region determination. By using the method of the invention, the compression ratio can be improved on the one hand, and the compression speed can be increased on the other hand, that is, when the video source with global motion is compressed, the motion prediction can be determined by means of unified judgment, without relying on relying only on macroblocks only. The sub-block motion prediction method sequentially determines each macro block sub-block.

It will be understood by those skilled in the art that all or part of the steps of the foregoing embodiments may be implemented by a program instruction related hardware, and the program may be stored in a computer readable storage medium. The storage medium may be a ROM, a RAM, a magnetic disk, an optical disk, or the like.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

Rights request

An inter-frame coding motion prediction method, the method comprising: determining whether to enter a global motion prediction according to a threshold range in which a relative change complexity information of a current frame is located, and if yes, determining the selected Determine whether the area is a strong consistent motion trend. If yes, obtain the current frame as a global motion, obtain the corresponding direction determination, and end.

2. The motion prediction method of interframe coding according to claim 1, wherein said step of "determining whether the selected determination region is a strong consistency motion trend" further comprises if the selected region is not a strong uniform motion The trend is based on the motion of each region, and the weak determination of the global motion direction is performed.

3. The inter-frame coding motion prediction method according to claim 1, wherein the determining whether to enter the global motion prediction according to a threshold range in which the relative change complexity information of the current frame is located is:

If the relative change complexity information of the current frame is greater than the first threshold, the current frame is considered to be extremely similar to the previous frame, and the current frame is determined to be a skip frame, and the skip frame indicates that there is almost no motion compared to the previous two frames; if the current frame is The relative change complexity information is between the first threshold and the second threshold, and then does not enter global motion prediction, where the first threshold is greater than the second threshold;

If the relative change complexity information of the current frame is less than the second threshold, then the global motion prediction is entered to determine whether the selected decision region is a strong consistent motion trend.

4. The motion prediction method of interframe coding according to claim 1, wherein the method for determining relative change complexity information of the current frame is as follows: extracting each macroblock according to macroblock motion information and macroblock texture information. Relative change complexity information; acquiring relative change complexity information of the current frame based on the macroblock relative change complexity information.

The inter-frame coding motion prediction method according to claim 4, wherein the extracting the relative change complexity information of each macroblock according to the macroblock motion information and the macroblock texture information is specifically: Obtaining macroblock motion information: that is, a mean square error of a pixel value difference between a pixel in the current macroblock and a corresponding macroblock in the previous frame;

Ti _ b _t . = std[ f _t (i, jl(i,j)e Mb _t . )― f _t _, (i, jl(i,j)e Mb _t — find the macroblock texture information: ie The mean square error of the pixel values in the current macroblock;

si_Mb _t>m>n =std[f _t (i,jl(i,j)eMb _t ^ _n )] When si_Mb _f . _m . _n =0, it is determined that the current macroblock is a single-point macroblock, that is, the whole All pixel values of the macroblock are the same pixel value; the macroblock relative change complexity information is obtained.

ti_Mb /si-Mb _t

Tis Mb,

0 si_Mb, _m =0 where: represents the macroblock of the mth row and nth column of the tth frame;

Mb'- ¹ represents a macroblock of the mth row and the nth column of the t-1th frame;

f^j) represents the pixel value of the jth column in the i-th row of the t-th frame;

f _t (i, j I (i, j) e Mb _t , _m , _n ) represents the image of the i-th row j column belonging to ^ in the t-th frame

1 Mb,

f _t — ^jK ^M _lmn ) represents the pixel value of the i-th row j column belonging to '- in the t-frame; std table unevenness variance;

ti_Mb _tmn represents: macroblock motion information of ^;

sLMb _t , _m , _n show: macroblock texture information.

The inter-frame coding motion prediction method according to claim 4, wherein the obtaining the relative change complexity information of the current frame based on the macroblock relative change complexity information is specifically:

. fcoun^ ++ , tis_Mb _tmn < ThresO

Tis- frames _t = <''

Coun^ , else where: ThresO is the corresponding zeroth decision threshold; t-th frame relative change in Frames _t complexity information;

Mb— ^

Macroblock relative change complexity information

7. The motion prediction method of interframe coding according to claim 1, wherein the determination area needs to satisfy the following conditions simultaneously: Condition 1: the determination area is a background area; Condition 2: at least two determination areas are selected; Condition 3: Detection of all directions is made in each decision area, all directions include: left side motion, right side motion, upper side motion, lower side motion, and still motion.

8. The inter-frame coding motion prediction method according to claim 7, wherein the condition 3 is replaceable by: in each of the determination regions, different directions are selected for detection according to the comprehensive consideration of the need and the calculation amount.

9. The motion prediction method of interframe coding according to claim 1, wherein the determining whether the selected determination region is a strong consistency motion trend specifically comprises the following steps: determining a macroblock as a unit The prediction direction of macroblocks in the area;

Count the number of motion macroblocks in all directions in each region;

The statistical information of the number of motion macroblocks in the corresponding direction in each area, determining whether the information of the area is

The determination of all the movement directions is made according to the movement tendency of the selected determination region; the strong determination of the global movement direction is performed according to the movement direction of each region.

The motion estimation method of interframe coding according to claim 9, wherein the macroblock prediction direction in the determination region is determined in units of macroblocks, specifically: in the selected determination region The macroblocks are respectively calculated as follows to calculate the mean square error of the difference between the left motion prediction value and the current code value difference, and obtain the mean square error of the left calculation of the right motion prediction value and the current code value difference, and obtain the right Calculating the mean square error of the difference between the upper motion prediction value and the current coding value difference, obtaining the upper motion prediction residual; calculating the mean square difference between the lower motion prediction value and the current coding value difference, and obtaining the lower motion prediction residual; The mean square error of the difference between the predicted value and the current encoded value is obtained as a stationary motion prediction residual.

The motion prediction method of the inter-frame coding according to claim 10, wherein the counting the number of motion macroblocks in all directions in each area is specifically:

In each area, the number of motion macroblocks in the direction in which the macroblock prediction residual is the smallest is incremented by one.

12. The motion prediction method of interframe coding according to claim 9, wherein the statistical information of the number of motion macroblocks in the corresponding direction in each region determines whether the information of the region is:

The difference between the number of macroblocks in the opposite direction of motion in one region is smaller than the first direction decision threshold or the number of macroblocks in the region including the left side motion, the right side motion, the upper side motion, the lower side motion, and the stationary five motion direction The difference between the maximum value and the next largest value is smaller than the second direction determination threshold, and the information of the area is not available.

The motion prediction method of interframe coding according to claim 9, wherein the determining of the motion direction according to the selected motion region is:

The direction of motion in which the number of macroblocks in a region is the largest is determined as the direction of motion of the region.

14. The motion prediction method of interframe coding according to claim 2, wherein the determining the global motion direction based on the motion of each region is specifically:

If the motion directions of the two decision regions are the same and do not belong to the stationary direction, and the number of macroblocks in the corresponding motion direction of each region is greater than the corresponding third direction determination threshold; or

The motion directions of the two regions are inconsistent, but the motion direction of one of the regions is stationary, and the number of macroblocks in the corresponding motion direction of the other non-stationary region is greater than the corresponding fourth direction determination threshold, then the global motion direction can be obtained, and the global phase is ended. Motion prediction judgment; Otherwise, a weak judgment of the global motion direction is made according to the motion of each region."

The motion prediction method of the inter-frame coding according to claim 2, wherein the performing the weak determination of the global motion direction according to the motion of each region specifically includes:

Calculate the difference of the direction of each type of area, that is, calculate the difference between the number of macroblocks in the maximum motion direction and the number of macroblocks in the sub-large motion direction. The minimum value of the same type is the direction difference of the area.

According to the various situations in each region, the optimal movement direction is determined.

The method for predicting motion of an inter-frame coding according to claim 15, wherein the determining the global motion direction according to each region is:

If only two areas of the two area information are valid,

If the number of macroblocks satisfying the moving direction of the area is smaller than the corresponding fifth direction determining threshold and the direction difference of the area satisfies the corresponding sixth direction determining threshold; or the number of macroblocks satisfying the moving direction of the area is greater than the corresponding seventh direction Decision threshold

Then the global direction of motion is the direction of motion of the active area.

17. An interframe-coded motion prediction system, the system comprising: a global motion prediction determination module, a strong consistency motion trend determination module, and a weak consistency motion trend determination module, wherein

The global motion prediction and determination module is configured to determine whether to enter the global motion prediction according to the threshold range in which the relative change complexity information of the current frame is located; that is, if the relative change complexity information of the current frame is greater than the first threshold, the current frame is considered to be The previous frame is extremely approximate, and the current frame is determined to be a skip frame, and the frame skip indicates that there is almost no motion compared to the previous two frames; if the relative change complexity information of the current frame is between the first threshold and the second threshold, Not entering the global motion prediction, where the first threshold is greater than the second threshold; if the relative change complexity information of the current frame is smaller than the second threshold, performing global motion prediction, entering the strong consistency motion trend judgment Module execution Strong consistency motion trend judgment module: used to judge whether the selected decision area is a strong consistent motion trend, if yes, obtain the current frame as a global motion, and obtain a corresponding direction determination; if otherwise enter the weak consistency motion trend Judging module execution;

The weak consistency motion trend judging module is configured to judge whether the selected judging region is a weak coherent motion trend, and if yes, obtain a corresponding direction judgment of the current frame; if otherwise, determine that the current frame does not have a global motion.