TWI221739B - Method and apparatus for moving picture compression rate control using bit allocation with initial quantization step size estimation at picture level - Google Patents

Abstract

A method and apparatus for rate control in moving picture compression. Bit allocation with initial quantization step size estimation is used at picture level. With the relationship between pre-analyzed activity of current picture to be encoded and actual complexity of previously encoded picture of the same type, a target bit budget can be allocated to the current picture in accordance with the present invention. Once the target bit budget has been determined, an initial value for an average quantization step size is estimated on the basis of the target bit budget, along with the relationship between pre-analyzed activity of current picture and actual complexity of previously coded picture. Such an initial value of the average quantization step size is useful to achieve higher picture quality at a given bit allocation.

Description

D. Description of the invention: [Technical field to which the invention belongs] The Ming refers to information, research, and refer to a borrowing; the Xun code system uses the estimated initial quantification method and clothes. ^ [Previous technology] for controlling π rate control It is well known that the world of electronic communication is undergoing a digital revolution. The main advantage of representing information digitally is that it can store, reproduce, transmit, process and use data bits almost without error. Stream (bltstr coffee). For example, E = color video images have 29.97 day-to-day images per second. Each day-to-day image has approximately four visible scanning lines. Each scanning line requires approximately 48 o'clock in red, green, and blue. Pixels to be rendered, but if each color component is encoded in 8 bits, the resulting bit rate is about 168 million bits per second (Mbits / s), so various video formats are not The bit rate after compression processing is very high and uneconomical, so it is not suitable for most applications. "The integration of digital audio and video with computers, telecommunications networks, and consumer products has further stimulated the information revolution. The core of this revolution is digital compression technology for video and audio. Many compression standards include the common use of compression technology. Essence-based algorithms, such as: ιτυ-τ (formerly CCITT) Recommendations H.261 and H.263, and ISO / IEC MPEG-1, MPEG-2, and MPEG-4 standards. MPEG algorithms It was developed by the Moving Picture Experts Group (MPEG), which is an International Standards Organization (ISO) and the International Electronic Technology Commission (Ini: ernai: i〇nal 1221739

The Electrotechnical Commission (IEC) 's joint technical committee is committed to the development of video and audio compression and multi-channel representation. These two standards standardize the syntax of the compressed bit stream and the decoding method. As far as the algorithm used is concerned, coding has kept a considerable amount of freedom for the novelty and diversity of coding. ^ According to MPEG, a series of video pictures are divided into _sequence groups of pictures (G0P), where each group G0p starts with a book face, followed by P-day face and B-day In the above arrangement, the first drawing illustrates a typical set of GOPs in the order shown.丨 ―The encoding of the diurnal plane does not need to refer to the previous or future diurnal plane. The P-picture refers to the I-day or P-dimension plane that is closest in time to the serial video picture, and the B-day The surface is scattered between the Bu day surface and the P-picture. And use the previous, future, or both tightly adjacent I-day planes and P-pictures to encode. Although several B-pictures can be followed by consecutive appearances', other pictures cannot be estimated from the B-day. The master picture has three components: brightness (represented by Y), red color difference (represented by Cr), and blue color difference (represented by Cb). For the 4: 2: 0 format of MPEG φ, the sampling points of each cr and Cb component are only half of the Y component in the horizontal and vertical directions. As shown in Figure 2, the basic composition block of an MPEG diurnal surface is a large block (macr0 | 3l0ck, expressed in MB). Taking 4: 2: 0 video as an example, each MB contains an array of 16x16 sampling points of the Y component and two blocks of 8x8 sampling points of the Cr and Cb components, where the array of 16x16 sampling points of the Y component is actually composed of 4 A block of 8x8 sampling points. The role of 8 1221739, ", and Bian Yiyi is to determine which picture encoding type and which prediction mode is the best. For each image, each 8x8 block in MB undergoes a discreet cosine transformation (discrete CC) sine plus ㈣.] To form an array of 8 conversion coefficients, and the conversion coefficients are then quantized by a quantization matrix, and then zigzag (zig_zag) is used to scan the quantization results of the DCT coefficients to obtain a series of DCT coefficients. And this DCT coefficient sequence is encoded with a variable length code (VLC). The p_day must decide to encode each MB with! -Type MB or p-type Μβ, and ^ -type Μβ is encoded with The method of j 逑 is this, and for each? -type mb, you need to get the prediction made by the previous day. This prediction is based on a motion vector (motlon vector ^ 得 'motion vector symbolizes the current picture The ribs to be encoded and the changes between their estimated Mβ in the previous picture, and the prediction error between the estimated Mβ and the current MB are coded with DCT, quantization, zeta-shaped literacy, and hole coding. Processing B-Day Surface Time ' Must decide which of the following Mβ modes to use We edit each MB I transform, F pull, β mode, and FB mode. I mode uses the rib itself to encode without motion compensation (like j㉟Μβ _), and f mode is one-way forward prediction coding 'Based on the previous picture's motion compensation estimation (like P 3L MB), otherwise' β mode is a one-way backward prediction editor, which is based on the prediction of the future compensation of the daytime. Especially the FB mode It is a two-way prediction coding. It uses both forward and backward motion compensation estimation to perform interpolation (her rpcaatiQn) to obtain motion compensation estimation of ρβ mode. For FB and FB modes, the prediction error can be used Map, quantization, zigzag literacy, and VLC encoding. The most important point of video encoder is the control of bit rate. The main purpose of bit rate and binary system is to intelligently allocate and encode each picture and its image. The number of bits used by each MB enables the encoded video to be decoded by the decoder. The video quality of the video has been exhausted. The encoder must take the rank of the entire image in order to reduce the visual quality. Control is possible at a given bit rate However, the actual bits used to encode a diurnal surface with the selected quantization level: it must be known only after transcoding, that there is no history transfer function in reality, which can be achieved in a given hope. The quantization level determines the actual recognition of a picture. The key feature of MPEG is that it is a thinnable method. This technology allows for the invariance of each day; encoding to different degrees, so that each The average and consistent visual quality is achieved in each frame and between different frames. However, the traditional bit rate control method is quite complicated. It needs to be ordered several times to complete the processing of video editing. In addition, the previous The technology lacks a simple mechanism that can be used to adapt the Ligularity of Ligularity to set the initial quantization level and make the picture quality more even. In view of this, ... a novel bit rate control technology can be used in the early two, that is, video encoders, and also look forward to providing control methods and devices at the written level. ㈣ Quantization level comes into bit 70 to distribute compressed video. [Summary of the Invention] According to the present invention, the allocation of the target bits of each picture is the result of the encoding of the first plane and the amount of active analysis of the current picture to be encoded ^, once the target bits are allocated After that, the initial value of 1221739 of the Heli order is also determined. Based on the pre-analyzed activity of the current picture and the relationship between "Ma Danian ~ inter-complexity, the current day-to-day complexity will be sufficiently known, and this estimated current day-to-day complexity is important for video The encoder is non- # β, which can more accurately allocate the target bit quota to each day and time. 1 Use the above-mentioned average quantization level initial value. Under the predetermined ambiguity conditions, the video encoder can output more The best daytime quality. P 11 is aimed at a dynamic shadowing and place rate control method that uses the initial quantization level estimation. The first is the current daytime to be coded: its full activity, where The current diurnal plane is a set of continuous images in a video sequence, “Zhong,” which is then based on the total activity of the current picture and this set of continuous diurnal: median isomorphic types of previously coded diurnal planes with their activity to complexity ratio. Estimate the projected complexity, and update the instantaneous complexity of this group with the current estimated complexity of the day and time; the allocation of the target bit quota of the current picture is based on the pre- = Complexity and instantaneous complexity To encode the current average level of the daytime plane, the value can be determined based on the current daytime plane's total activity, the target bit quota, and the previously coded daytime plane's activity to complexity ratio of the same type of sadness. Based on the initial value of the average quantization level, the current diurnal plane in the video sequence is encoded. After the current diurnal plane coding, the current diurnal plane = full activity, the actual number of bits consumed by the current picture, and the average diurnalization of the current diurnal plane. Bit δ ten different eyes: The ratio of the amount of activity to the complexity of the day. In this regard, the ratio of the amount of activity to the complexity of the current picture is proportional to the total amount of activity of the current picture and is consistent with the picture of the fourth picture. The number of consumed bits is inversely proportional to the average quantization level. On the other hand, the present invention also discloses an updater for daytime shrinkage bit rate control of a moving image that uses an initial quantization level to estimate 11 ^ 221739. The motion estimation unit receives video data that is about to be encoded. The current diurnal surface is used to calculate the total activity of the current screen when performing the continuous performance diurnal surface. Based on the current book " 'block matching and the same type of continuous reading diurnal surface 1 The ratio of the total activity volume and the complexity level. The activity volume of the complex static material is compared to the breadth of the complex surface. The quota dispatcher updates the group connection = two Γ :, and according to the estimated complexity and instantaneous complexity. ::: I have only shown the position of the eye to see the amount of i check; ^ The knife is the surface. It is used to encode the initial value of the first order of the current day, and then the quantization level estimator uses the current picture to 1; The bit quota and the amount of activity on the front of the financial platform of the same type are determined based on the ratio of the complex value = complex \, 复. The parameter updater is based on the currently written =;:, the actual number of bits consumed and the current The average of the picture: = = the level of the difference between the current day's activity and the complexity ratio, in the basin, the second check = the ratio of the amount to the complexity is positive with the current total activity of the day: ::: Zedan The number of consecutive consumed bits and the average quantization level are inversely proportional. "[Embodiment] In order to make the above-mentioned purpose of the present invention, the special m more clear, the following specific examples-preferred embodiments, and with the accompanying drawings, make In detail, at the beginning, the I-day and p_days used for prediction must be decoded in the red coder first. ^ (⑽t _n square) between the surface of the original daytime face day and decoding error 'which can be decoded picture quality passenger: 121221739 in degrees. Taking the root-mean-square error as the distortion of the Chama decoded picture, the written complexity (c0mpiex) -c: is defined as follows:-The bit rate required for H-encoding the daytime plane, d is The loss between the decoded picture and the average quantization level (quan1: izati〇n step size) and distortion is proportional to each other, so the complexity of the day surface can be defined as: C ^ — ~ ί 2 _, Middle 1 is the average quantization level of the picture. After the daytime coding, the bit rate (the number of bits actually consumed) and the average quantization level will be known, and the complexity of the picture will be obtained as a result.

^ The complexity of the day surface depends on the nature of the day surface and its encoding form. The prior art uses the complexity of the recently coded picture to represent the current complexity of the diurnal plane, and maintains its complexity separately to reduce the impact of different encoding forms. The content is smooth change ', then this method can achieve quite good results. H Since the target bit encoding of the picture is consistent with the actual number of bits it consumes, if the content of the video sequence changes significantly, the above method is not suitable for achieving — According to the present invention, the analysis of the current amount of diurnal activity (aetiv⑼) and the actual complexity of the previously encoded diurnal surface can be reduced, and the current complexity of the diurnal surface can be estimated from this. Attempt to measure the bit rate and quality after daytime encoding, assuming the full amount of activity A of a daytime surface: compared to complexity C, then 'A ^ kxC ^^-xj ^ xq = kxxr xq 13 1221739 where' k is a proportional constant. If k is the activity-to-complexity rati0 (ACR), then the total activity A can also be expressed by the following formula: 〇ί] = Ί ^ According to the present invention, Can be from the same type State the previous coded picture to estimate the ACR. Conceptually, first calculate the full activity amount A before coding a day, and then, the complexity of the daytime corpse w to be coded is estimated as follows: 1. J0) ^ The m is the total activity of the diurnal surface, which is the ratio of the activity to the complexity of the previously coded diurnal surface of the same type of actinide. In the following, the superscript ⑴ in a symbol or variable indicates that the symbol or variable is the same as the current day to be coded. 'The symbol or variable = superscript (h) is related to the previous edited day surface. The estimated complexity post can be used for the appropriate type of diurnal surface, including the degree: so the complexity of the three types of diurnal surface C / ,. And ::: Save for subsequent processing. A set of consecutive books .tant following uscomplexitw in such a way;

TC, xC] + Np 乂 Cp + N0C where 'I ... and ~ are the number of continuous pictures in this group' and the -group of continuous daylight surfaces at least include people_ 广 日 面-旦C has decided, beijing each ;, and and coffee. Yuan quota Han ⑺ is the target position of the | — y J? INST a C eff where ~ is a set of effective digit target bit quotas of continuous day and time 仞 ((( ) Is related to complexity. ° can be known from the above formula, and is inversely proportional to the instantaneous complexity 14 1221739. All MPEG-2 data bit streams must comply with the MpEG_2 standard video buffer verifier (VBV) As a rule, the allocated target quota must be limited so that the VBV buffer does not overflow (0vern0w) or underflow. Originally, only the current average dailyization level of households can be obtained after encoding. It is estimated after the target bit quota ⑺⑴ is determined. According to the present invention, the current picture / its estimated average quantization level is as follows. Q (0 = one est TB ^ XACR {^ _ where, as if it were the average quantization level Initial value. With the initial value of this average quantization level,丨, the video encoder can turn out a better picture quality under the predetermined bit quota, and when the current day's target bit quota and amount_determination initial value is determined, many different types can be used State video coding, such as Test Prototype 5 (Test Mode; [5), described in the MPEG-2 standard, completes the compression of the daytime plane according to the target bit quota. At present, after the daytime plane is encoded, its actual The complexity will be known, and the relationship between the current day's total activity and the actual complexity, and ⑺ can be obtained from the following calculations: ACR {i) 一 ^ 一 ~ AQ {i) X UB {i) ", Is directly proportional to the full amount of activity /), and inversely proportional to the actual number of bits consumed on the current day, and the average quantization level ^)). This can be used to estimate the next picture of the same type Complexity. JC / jW can be linearly combined with 『⑶㈣） to avoid being affected by those noise-rich pictures. The single-pass video coding of the present invention can be implemented by the car in accordance with Figure 3. The example is explained in conjunction with the operation flow chart in Fig. 4. As shown in Fig. 15 1221739, the moving image The video encoder 300 includes a motion estimation unit 3o, a complex degree estimator 320, a quota dispatcher 33 (), a _parameter updater ⑽, a localization level estimator 350, and an image encoder 36. Single j 3i0 = will be encoded in a set of continuous day-to-day images in the video sequence: head: frame F, which is used to calculate the total activity of the current frame _ when performing block matching for motion estimation, (step S41 〇). Based on the full amount of activity ^) and the previously coded pictures of the same type in this group of consecutive days, the meaning is howl) ^ ^ Λ ',' complexity

Ye Yi 320 can be used to estimate the complexity of the current day (step ⑽). The quota allocation t 230 is updated with the estimated complexity of the group's consecutive written instants = -C, and the quota is given to the current day P⑺ (step S430). The initial average value of the average quantization level 编码 used to encode the current principal plane ⑽ is determined by the quantization level estimator 八 based on the eight-quantity-two-t-bit quota and the amount of activity ^ (step S440). In this embodiment, the image coding = 36G is based on the initial value, and the current picture is encoded in an adaptive quantization manner.

After the completion of the service, the actual number of consumed bits and the average amount are reported to the parameter updater 34 (step S45). The total number of consumed bits 全 (1) and the actual average quantization level (0 = device 340 is the current ratio of the daytime degree) (step S460). The preferred embodiment can be implemented in hardware and body. According to the present invention, the single force of motion estimation 31 and the pipeline (Pipellne) mode in Figure 3 ... Before starting to calculate the complexity of the current picture, move The estimation unit 310 must 16 1221739 to complete the estimation of the motion vectors to be coded, and the calculation of the R's life cycle, the activity in the king's activity, and the relocation, the operations related to the day-to-day plane: Continue = He 7 is still busy completing all the components. Let ’s describe in detail the per-movement estimation in the preferred embodiment. Open qin AA + & mode. One of the main purposes is to decide what to use. Prediction: "Code each mb in a daytime surface, such as forward and backward Jiang Fanyuan, day 丨 w subject to activity, and also the momentum of the asset mi can extract the picture activity from the block matching operation ( lntra calculates 100 MB of its own activity (1Vity), and will add 4 8x8 brightness values in one Mβ + # 素 强Degrees are represented by Ym, n, ㈣ 7, _n degrees & block image 8x8 di # # ji '二 ··' n—,. _., 7, and each "average is 7; then each IntraAct: ^ traAct ^ Yjjk where k = 0 and decrease Uf (^ 7 = 0 77 = 〇) If a lower calculation is required, the degree of heterogeneity can be replaced by the relative absolute value of ^:

IntraAct = Y ^ A where k = 0 w = Ow =: 〇 Mode ’Therefore IntraAct has only one mode for the mb in the diurnal surface, which is the activity amount of each MB in the diurnal surface. 17 1221739 (intra coding) (such as p- and β_ picture), the benefit = the number of mutations or the absolute value of distortion and minimized to choose forward ^ two-way prediction or no need for motion compensation. -Once ...-Each Mβ in the daytime surface: 2 = the difference between the four components in the dynamic compensation Mβ-W η, the true pair value usually has a better calculation, so it can be used instead of the number of mutations. Calculate the sum of the values of the four distorted blocks and add them to each other in the non-inner coded picture.

Move: (: rr, lty), inierAct, and then write the non-internal code in the MB of IntraAr 10 e Gan T ‘A ▲ ~ τ I — _? , = Syria, ,, and right, use inte ^ ct as the MB ’s living ria to encode in inter_mode; otherwise, use = traAct as the MB ’s activity and use its own mode (intra- mode) edit the MB. Finally, for the current Bu, Bu, or Bu picture, add all the cost of the activity = to get the full activity.

The data is fed to the complexity estimator ㈣, the parameter updater 340, and the rank estimator 350. Next, the complexity estimator 320 is the current picture user of a certain type (0 estimates the production, and according to the three picture types, introduces weighting coefficients to the estimated:,, 如. Because B-pictures must not be used to estimate For other pictures, the β-picture weighting coefficient can be reduced to allocate fewer bits to the B-picture and retain more bits to the I- and ρ_ pictures; generally speaking, encoding pictures will produce the most Bit 'so the weighting coefficient of P_day plane and the weighting coefficient of Xiaopu day plane. The complexity estimator updates the complexity Q, 18 c picture households (0' or G) according to the current picture type. Project calculation: The complexity is as follows if (I-picture) ACR (rl) e 1 se if (p * ~ picture) ci:! = Cp = KpXisr else if (B-picture) ci:! = Cs = KBXisr y (il) C ^^ Cl = Klx-C-

: In the squat 'examination and squat%' group of consecutive pictures, P ^ and B are stored in the number updater 340, and Fu 'dan, it is estimated that the juice benefit 320 will be the corresponding type of previous day-time reading correspondence. Activity: ratio of complexity. The number of W addi- tions, p, and the addition of 2 wonderful numbers' is generally in the range of 0 to, n 〇. As for the picture, the side A can also use KI 丄 .〇〇 复 _ Pt f to; the quota dispatcher 330 updates the continuous picture for this group = inter-hardness technique Γ-C and assigns the target day surface, The number of inter-complexity updates Γ-C, N1, N1, NP'N \ Cb. Furthermore, _! Γ is the im-picture η x —xi? In this group of continuous daytime planes, and the target bit quota 刖 of the heavy plane P () is

INST C 19 where η is the number of continuous diurnal planes in this group, f is the number of frames per second, that is: frame rate, R is the expected average bit rate of continuous diurnal planes in each group. However, the actual number of bits consumed will not be exactly equal to the expected number of bits, so a feedback strategy is developed to make the number of bits actually consumed by the day close to the target minus. In the preferred embodiment, The super-used bits 编码 encoded so far can be partly amortized from the current daytime being encoded:

TB ⑴ = TB ⑴-ARxEB where ’EB is the amount of overused bits transmitted by the Cumulus Updater 340, and AR is a predetermined amortization rate, and its range is generally between G.Q5 and G.2. The quota allocation unit 330 must adjust the target bit quota to comply with the 懦 specification, so it also sets the upper limit OLboimd) and lower limit (L-b_d). As for the operation of constant bit rate (constant Mt rate, CBR), the target bit quota allocated to a daytime surface must be such that the VBV buffer will not overflow or be scarce, so the target bit quota 7SW is limited to above, Within the lower limit: if (7SW > u_bound) then Γ5⑺ = u—bound if (7SW < L_bound) then ⑺ = L_bound If it is a variable bit rate (VBR) operation, then only _ It is enough to prevent VBV shortage, so: if (7BW > u-bound) then ⑺ = u-bound Then, the target bit quota] will be sent to the parameter updater 34, the quantization level estimator 350, and the image encoder 36〇. Once the target bit quota has not been determined, the quantization level estimator 3 50 can estimate the initial initial value of the average quantization level needed for its encoding for the current picture (i). Initial value used to quantify the current day surface of a particular pattern 20 1221739 if (I-day surface)

Aii) TB {i) xACR ° ~ l) 1 if (P-day) A⑴ TB {i) xACR (i ~ l) P if (B-picture) A⑴ ί TB {i) xACR {i ~ l)

The B-connector transmits the initial value of the average quantization level to the image encoder 36. By adaptively changing the quantization level of each spatial region in the picture, the video encoder 300 of this embodiment uses a virtual buffer to provide a feedback mechanism of bit το rate control. Adaptive quantification is a knowledge technique for those familiar with dead arts, so it will not be repeated here. Virtual = Utilization utilization status (〇CCUpanCy) controls the quantization level, thereby holding down. However, the virtual buffer must specify an initial utilization: the utilization status of the sub-second virtual buffer in the G area also reflects the The encoding level of every ^ m 4 is' so the utilization of the virtual buffer not only controls the perceived quality. Under the condition of the high bit rate, the image quality in the video editing sequence is more consistent with the help of the initial value. 、, ΐ9 Μ · MO from mobile management-〇, signal line WE, image encoder vector and m mode; early = receiving picture data and reducing the moving energy of each MB visible positioning unit amount Next, as far as possible, the encoder 360 determines the quantization level used to encode each rib of the current day based on the average value of the initial quantization level 21 1221739. Based on these data, the image encoder 360 starts to艸] to encode and output the encoded data CD. After the current day surface furnace> encoding, the encoder will average the quantization levels and calculate the actual consumption bits ^^, and then report the current picture's 劭 w and average quantization levels "to the table number updater 340. / 面面 炉) target bit quota of 75 ("and the actual number of bits consumed (0

The gap between them will be accumulated by the parameter updater 34 to obtain the overused bit quantity EB after the daytime household 0 encoding. EB ^ EBx (l- AR) + UB (i)-TB (i) where, AR is an established amortization rate. Therefore, the relationship between the amount of activity and the actual complexity, / Ci? ⑴, can be obtained from the following calculation // (〇ACRU) = —4 ——- ΑΟω x UB {1) This jCi? ⑴ can be used to estimate the same The complexity of the type of the next day surface. In order to prevent "^ (〇 from being affected by noise-rich daylight, the preferred embodiment uses and

dC /? (7 linear combination, for example: if (I-day) ACR ^ = ACR (/-l) x (1 ^ CW) + ACR (i) x CW else if (P-picture) ACR (; } = ACR (; ~ l) x (1-CW) + ACR (i) x CW else if (B-picture) ACR (J} = ACR (fX) x (1 ~ CW) + ACR ^ x CW where, CW is a linear combination of the established weighting coefficients. The updated p and xin are transmitted to the complexity estimator 320 and the quantization level 22: counter 35. In order to start the next day of the appropriate type and the quantization level Value, in addition, open, prostitutes and other super-used bits EB are sent to the quota for Paishai 330 as a bit allocation. Although the present invention has been disclosed as a specific embodiment above, it is only for easy The technical content of this phase is not limited to the present invention in a narrow sense to those who learn this technology, without departing from the spirit and scope of the present invention.

The $ within the range can be changed and retouched slightly. Therefore, the scope of protection of the present invention shall be determined by the scope of the attached patent application.

23 1221739 [Schematic description] Figure 1 shows a typical day group (GOP) in the order shown; Figure 2 is a large block of MPEG; Figure 3 is a bit of a preferred embodiment of the present invention A block diagram of the rate control device; and FIG. 4 is a flowchart of the operation of the present invention. [Symbol description] 300 ~ Motion video encoder; 310 ~ Motion estimation unit; 312 ~ Signal line; 320 ~ Complex estimator; 330 ~ Quota dispatcher; 340 ~ Parameter updater; 350 ~ Quantization level estimator; 360 ~ Image Encoder; P (7 ·) ~ Day Surface; ~ Full Activity; ~ Estimated Complexity; iC /? W ~ Activity Ratio to Complexity; Viewing ~ Over-utilized Bits; ~ Target Bits Quota; ~ average quantization level; ~ actual number of bits consumed; 24 1221739 ~ average value of average quantization level; ακ-coded data.

25

Claims (1)

1221739 Scope of patent application: A method for controlling the bit rate of moving image compression using the initial quantization level estimation, including at least the following steps: Calculate a full activity for the current day and day to be encoded, which is currently written in a Among a set of continuous day-to-day faces of a video sequence; based on the ratio of the amount of activity to the complexity of the previously coded day-to-day face of the same type of sadness in the set of continuous pictures, estimate one of the current written Complexity; one of the faces updates the set of continuous day-to-day complexes with the complexity of the current day-to-day estimate; assigns a target bit quota to the current day-to-day face based on the estimated complexity and the instantaneous complexity; and Based on the ratio of the amount of activity to the complexity of the pre-day diurnal plane, the target bit amount of the current diurnal plane, and the 4 different types of a priori coded diurnal diurnal planes, it is decided to encode one of the current pictures Initial value of average quantization level; Encode the current daytime plane of the video sequence based on the initial value of the average quantization level; and after encoding the current daytime plane, according to the full activity of the current daytime plane, the actual consumption of the previous picture ^ The number of bits and the average quantization level of the current picture calculate the ratio of the amount of activity to the complexity of the current day. Β The ratio of the amount of activity to the complexity of the current day is proportional to the amount of the current picture. It is inversely proportional to the actual number of bits consumed in the current picture and the average quantization level of the M-membrane plane. 26 2. The method for controlling the bit rate of moving image compression as stated in item 1 of the patent scope, further includes at least the following steps: The above-mentioned current day-to-day activity ratio to complexity ratio and the same type of J, A linear combination of the ratio of the amount of activity to the complexity of the flat-day surface. '' As described in Item 1 of the scope of the patent application, the above-mentioned full-time activity of the current daytime plane is controlled by the motion image compression bit rate control method, and the above-mentioned current activity is at the time of the above-mentioned current paper for motion estimation. 4 As described by the above-mentioned owner, please request the bit rate control of the moving image compression as described in item 丨 of the patent scope, where the above steps of estimating the complexity are calculated according to a formula: cest = Kx "L · On ACR where" c ... is the above-mentioned complexity estimated in the above current picture, not a predetermined weighted value, which ranges from 0 to 1, "is the above-mentioned total activity amount of the above-mentioned day-to-day view in the above set of continuous pictures, "Ci? Is the ratio of the amount of activity to the complexity of the previously encoded pictures of the same type. 5. According to the motion image compression bit rate controller described in item i of the scope of the patent application, where the target bit quota allocated above is directly proportional to the above-mentioned complexity of the current daytime surface, and is related to the above-mentioned set of continuous pictures The above-mentioned instantaneous complexity is inversely proportional. 6. The method for controlling the bit rate of moving image compression according to item 1 of the scope of the patent application, wherein the initial value of the average quantization level is determined by the following function: MQest = —ά_ TBxACR where 'represents the initial value of the average quantization level, j is The total activity of the current day surface in the above set of continuous day surfaces is the target bit quota of the current day surface of the current picture 27 1221739, which is the previously encoded day surface activity of the same type. Ratio of complexity. 7. The bit rate control method for dynamic image compression as described in item 1 of the scope of patent application, wherein the above-mentioned group of continuous diurnal planes includes at least one diurnal plane group (picture (GOP)), and the diurnal plane group conforms to MPEG video standard. 8 · A dynamic image compression bit rate control device using initial quantization level estimation, including at least: & a motion estimation unit that receives a set of consecutive daylight planes in a video sequence to be encoded-the current daylight plane , Used to perform a motion estimation block matching, which is different from the full activity of the current picture;: complexity estimate H, based on the current activity of the current day and the same pattern in the group of continuous pictures The ratio of the amount of activity to the complexity of the previously coded picture is used to estimate one of the current day-to-day complexity; ㈣ 贝 分派 益 'updates the set of continuous day-to-day complexes with the complexity estimated from the current day-to-day. Degree, used to allocate a target bit quota to the current day surface based on the estimated complexity and the instantaneous complexity;-a quantized level estimator, based on the full activity of the current picture, the current master, and the target The bit field degree and the activity-to-complexity ratio of the previously encoded picture of the same type are used as a basis for the mosquito to encode the initial value of the quantization level of the current picture; and a two-parameter updater that uses the The total amount of activity in the previous screen, the current written date, the reading of the Shaw bit and the average quantization of the current day. The ratio of the current day's amount of activity to the complexity; based on & calculation 28 1221739 The degree of complexity of the diurnal silk momentum is: 'the tongue-momentum momentum is directly proportional to the number of bits consumed by the current diurnal surface; the average quantization level of the straight face of the objective is inversely proportional. I: Application of the motion image compression bit rate control described in item 8 of the Γ Lee range. The above-mentioned parameter update $ also performs the above-mentioned current day and its activity on the complex. A linear combination of the ratio of the activity to the complexity of the previously coded picture to reduce the effect of noise. also The dynamic image compression bit rate control device described in item 8 of the scope of the patent application further includes at least an image encoder, so as to encode the current day surface according to the initial value of the average quantization level, and The actual number of bits consumed by the current day and the average quantization level used in the current picture coding are reported to the parameter updater. U. As described in the scope of patent application 申请 8 $, the dynamic image repeated shrinkage rate control vibration setting, wherein the above complexity of the current picture estimated by the complexity estimator is based on a formula: Cest = Kx — ACR Among them, C ... is the above-mentioned complexity of the current day-to-day estimation, which is a predetermined weighting value, which ranges from 0 to 丨, meaning the above-mentioned full activity of the above-mentioned current picture in a set of continuous pictures. The quantity is the ratio of the activity quantity to the complexity of the previously coded picture of the same type. 12 ·· The dynamic image compression bit rate control device described in item 8 of the scope of the patent application, wherein the allocated target bit quota is proportional to the above-mentioned complexity of the current day and is proportional to the above-mentioned set of continuous pictures. The above-mentioned instantaneous complexity is inversely proportional. 29 izzi / jy 13. As set in the scope of the patent application, where the initial value of the quantization level mentioned above: The dynamic image I scale estimator described in the above item determines the above with the following function: MQest = A TBxACR = surface 7: represents the average quantization The initial value of the rank is the above-group connection, once, middle, and ^ is the above-mentioned total activity of the current day, π is the above-mentioned target bit quota of the above-mentioned target screen of the above-mentioned current picture, and is the previous previous type Coding the ratio of the amount of activity to the complexity of the day. 14. The dynamic image compression bit rate control device as described in item 8 of the scope of patent application, wherein the above-mentioned set of continuous day-planes includes at least one day-plane group (gr0up 〇 "picture 'GOP), and The day-to-day group meets the mpeg video standard. 30