CN101651827B - Code rate control method of screen coding - Google Patents
Code rate control method of screen coding Download PDFInfo
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- CN101651827B CN101651827B CN 200910054923 CN200910054923A CN101651827B CN 101651827 B CN101651827 B CN 101651827B CN 200910054923 CN200910054923 CN 200910054923 CN 200910054923 A CN200910054923 A CN 200910054923A CN 101651827 B CN101651827 B CN 101651827B
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Abstract
The invention discloses a code rate control method of screen coding, belonging to the technical field of telecommunications. The method comprises the following steps: 1. using a computer screen to code, and setting a code rate upper limit; 2. according to a defined frame rate, using the method of the step 1 to code screen information, controlling the code rate by partitioning and time division, displaying the coded information in the form of sheet, and sending a sheet to a receiving part by each frame at intervals; 3. successively receiving each sheet by the receiving part, and performing screen coding corresponding to step 1. With the method of code rate control of partitioning and time division, the invention can confine data amount at any time to be below the upper limit of a fixed code rate so as to improve the reliability of network transmission under the condition of bigger code rate changing range. Meanwhile, the invention does not affect the resolution ratio of a screen image coded with various screen coding methods.
Description
Technical field
What the present invention relates to is the control method in a kind of telecommunication technology field, and specifically, what relate to is a kind of bit rate control method of screen coding.
Background technology
At aspects such as the computer remote Web-based instruction, supervisory control system, Web conferences, the computer screen image transmission is an important link.Because the complexity of screen picture, screen picture is higher for the bandwidth demand of network, and has instability, characteristics that the code check excursion is big, and Network Transmission is produced bigger pressure.Rate Control is meant the technological means of bit rate constraints under assigned rate of the code stream after the media compression, is widely used in the video coding.And the demand of Rate Control is arranged in screen coding equally, and can improve adaptive capacity for various network conditions, improve the performance of above-mentioned application aspect the screen picture transmission.
Literature search through to prior art finds that the patent of China national number of patent application 200510026390.0 " multi-dimentional scale rate control method of network video coder " has proposed a kind of multi-dimentional scale rate control method of network video coder.This technology applicable object is the Rate Control in the video coding, and the domain of walker of code check is less in the video.Simultaneously, the resolution of the compressed images that this method produces does not guarantee identical with former resolution, does not stipulate the limit bit rate of fixed size yet.And the application of screen coding has the advantages that the code check floating range is big, predictability is low; In addition, the original resolution of computer screen image is far above the resolution of common network real-time video image, so this technology is not suitable for screen coding.
Literature search through to prior art is found; The patent of China national number of patent application 200610027171.9 " a kind of screen coding method under low code rate " has proposed a kind of computer screen coding method with low code check, the correlation before and after mainly having utilized between the frame.Therefore this technology does not propose the Rate Control scheme of corresponding this method, and the code check floating range is bigger in practical application, and is should technology not enough in the adaptive capacity to network condition.
Summary of the invention
The present invention is directed to the deficiency of prior art, a kind of bit rate control method of screen coding is provided, the present invention is limited under certain limit bit rate the screen transmission, thereby improves the reliability of Network Transmission.Simultaneously, the present invention does not influence the resolution of the screen image behind the various screen codings, and after pictorial information was decoded, the resolution of the image that produces behind resolution and the former screen coding of image was consistent.
The present invention realizes through following technical scheme, may further comprise the steps:
May further comprise the steps:
Step 1, the screen coding that uses a computer, and limit bit rate is set.
Computer screen coding described in the step 1; Be meant computer screen information is carried out processed compressed, thereby the data volume that screen message is comprised reduces significantly, corresponding with it is the screen decoding; According to the data of having carried out processed compressed, the screen image before the reduction compression.
Described limit bit rate is meant the upper limit of institute's ability data quantity transmitted in the unit interval.
Described screen coding comprises following substep:
The first step is unit with computer screen with certain rectangle size of confirming, is divided into several zonules, and each zone is a little rectangle.
Second step, obtain the zone that image changes in the present frame, and such region of variation and the rectangular area in the first step are compared, from these rectangular areas, get rid of the zone that does not change.
The 3rd step, handle one by one for each zonule that changes, itself and the pictorial information of each zonule in the frame are before compared, if consistent then only need the positional information of the record zonule consistent with it; If inconsistent, then certain still image compression method to be adopted in this zonule, and preserve the data after the compression, other zonule after being used for compares with it.
Step 2 according to the frame per second of confirming, is used the method for step 1 that screen message is encoded, and is carried out the Rate Control of piecemeal timesharing, and coding back information is represented that with the form of sheet each interFrameGap time is sent a sheet to the recipient.
In the step 2, described frame per second is meant the quantity of the frame of unit interval domestic demand coding.The screen transmission that the present invention is real-time if desired then needs the designated key frame per second.Described key frame is meant in the described screen coding of step 1, and a complete coding of needs and its each subregion that is encoded do not rely on the independently frame of the pictorial information of other frame.Described crucial frame per second is meant quantity of key frames in the unit interval.
The Rate Control of described piecemeal timesharing is meant through the pictorial information piecemeal of a frame is handled, the information of each piecemeal behind the piecemeal is kept in the film trasport formation to be passed, and the bit rate control method that goes in the process to the processing of frame one by one after assigning to.Wherein, described film trasport formation to be passed is to be used for preserving the formation that screen image divides block message, these minutes block message be kept in this formation with the form of sheet, when timesharing is transmitted, from this formation, extracting sheet information can transmit.
Described, be meant: after handling through coding in this step and Rate Control, will be in each interFrameGap quilt information transmitted unit one by one in the time.
Described substep to the processing of frame one by one is following:
The first step is checked current treatment state, and sets the parameter of the screen coding of above-mentioned steps one according to the data predicted amount.If inspection is not passed through, check film trasport formation to be passed, when this formation is not sky, from formation, takes out next sheet and be transferred to the recipient; If this formation is empty, then revises current state and be: allow coding.
Described current treatment state is meant: employed a kind of Status Flag in the bit rate control method of the present invention, one of following several kinds of states of its ordinary representation: allow coding; The suggestion coding; Do not allow coding.Under the state that allows coding, for the check result of current treatment state for passing through; Under the state of suggestion coding, whether pass through by actual embodiment decision for the check result of current treatment state; Under the state that does not allow to encode, for the check result of current treatment state for not passing through.When initial, current treatment state is: the suggestion coding.
If specified key frame, and the current frame of handling is key frame, with the inspection of forcing through here.
Described data predicted amount is meant: for the predicted value that can produce how many data volumes behind the present frame coding, it was undertaken by following the 3rd step, and the data predicted amount is set to the ratio of limit bit rate and frame per second when initial.
The parameter of described screen coding is meant: in order to the parameter of adjustment coding, they influence encoding quality, efficient usually in the screen coding, and higher quality can cause bigger data volume, and are therefore relevant with the data predicted amount.
In second step,, then use above-mentioned steps one to encode if the inspection of the first step is passed through; If do not pass through then the processing end of present frame.
In the 3rd step, analyze the data volume of present frame, and estimate the data volume of next frame.
The data volume of described analysis present frame is meant: the data total amount that obtains the coding result generation of present frame.
The data volume of described estimation next frame is meant: according to the data volume of continuous some frames, perhaps whether next frame is various information such as key frame, predicts the data volume of next frame.
In the 4th step, the Rate Control of execution piecemeal timesharing is revised current treatment state, transmits a sheet to the recipient.
The Rate Control of described execution piecemeal timesharing is meant: if data volume has surpassed the ratio of limit bit rate and frame per second, then data will be performed the branch block operations, and each piece that obtains behind the piecemeal is saved in film trasport formation to be passed with the form of sheet.Described minute block operations is meant: under the frame per second of current setting, how many pieces are the data volume of calculating present frame need be divided into, and the data volume that makes each piece is no more than the ratio of limit bit rate and frame per second after converting the data volume of unit interval into.The data of present frame actual transmissions are first in these piecemeals, therefore first sheet in the film trasport formation to be passed are taken out and send the recipient to.
If data volume is no more than the ratio of limit bit rate and frame per second, the data that then coding result of present frame produced send the recipient to the form of a sheet.
The current treatment state of described modification is meant: surpass in data volume under the situation of limit bit rate and the ratio of frame per second, revise current treatment state and be: do not allow to encode; Be no more than in data volume under the situation of ratio of limit bit rate and frame per second, revise current treatment state and be: the suggestion coding.
Step 3, the recipient receives each sheet one by one, carries out the screen decoding corresponding with step 1.
In the step 3, described recipient is meant: in practical application, and a side who receives screen message and be used.
Recipient described in the step 3 receives each sheet one by one, carries out the screen decoding corresponding with step 1, comprises following substep:
The first step is carried out data analysis to working as anter, and the use screen decoding corresponding with the screen coding of step 1 handled.Described data analysis is meant: it is the information of having represented a complete screen image that anter is worked as in analysis, has still represented the information of certain piecemeal of screen image.
In second step, be presented at the information after the decoding processing on recipient's screen.If when anter is represented the information of certain piecemeal of screen image, then on the update displayed screen to zone that should piecemeal.
A kind of bit rate control method to screen coding that the present invention proposes can solve the bigger problem of code check floating range that screen coding produces, thereby improves the reliability of Network Transmission.Method of the present invention can be widely used in fields such as the computer remote Web-based instruction, supervisory control system, Web conference, computer remote control system.In above-mentioned application, the average bit rate of screen coding is not high, but the amplitude of variation of code check is often bigger; For example in time a few minutes; Code check can extremely float in the scope about maximum per second 300Kbyte at minimum per second 1Kbyte, and its maximum is considerably beyond the maximum bandwidth that allows under the general networking condition, for example per second 128Kbyte; If do not carry out Rate Control in the actual transmissions process, then the possibility of pictorial information partial loss is just very big.The present invention can be under these conditions; The data volume in any moment all is limited in below the per second 128Kbyte; Thereby improve the reliability of Network Transmission, high application has higher-value to reliability requirement for supervisory control system, this type of computer remote control system for this.Simultaneously; The present invention does not influence the resolution of screen image behind the various screen codings, still can reduce original picture resolution fully through decoding, is therefore having in the application of high request for reliability and screen image quality; For example long-distance education aspect has great importance.
Description of drawings
Fig. 1 is the inventive method schematic flow sheet.
Fig. 2 is the scheme sketch map of one embodiment of the present of invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
As shown in Figure 1, present embodiment is implemented through the process shown in the flow chart, comprises that step is following:
Step 1, the screen coding that uses a computer, and limit bit rate is set.
Step 2 according to the frame per second of confirming, is used the method for step 1 that screen message is encoded, and is carried out the Rate Control of piecemeal timesharing, and coding back information is represented that with the form of sheet each interFrameGap time is sent a sheet to the recipient.
Step 3, the recipient receives each sheet one by one, carries out the screen decoding corresponding with the method for step 1.
Above-mentioned steps one, the screen coding that promptly uses a computer, and limit bit rate is set.Wherein, described computer screen coding is meant computer screen information is carried out processed compressed, thus the method that the data volume that screen message is comprised reduces significantly.
The original data volume that screen image information comprises is very big; Under the resolution of common computer screen, the original data volume that a frame screen image comprises is about 2Mbyte, if do not carry out screen coding; Even per second only transmits a frame, data volume is also considerably beyond the bandwidth constraints of using network always.And through after the coding, data volume can reduce significantly, and image compression method for example commonly used can make its data volume be reduced to 1/50 to 1/10 of original data volume.In screen coding, the amplitude of this reduction is bigger, and the correlation before and after utilizing between the frame can make the data volume of a part of frame be reduced to several one thousandths.Corresponding with it screen decoding is meant according to the data of having carried out processed compressed, restores the method for former computer screen image.Limit bit rate is meant the upper limit that institute in the unit interval can data quantity transmitted, per second 128Kbyte for example, and this upper limit is generally relevant with the residing network bandwidth condition of present embodiment.
The image of nearly all screen display is all rectangular, and the screen coding of present embodiment comprises following substep:
The first step is unit with computer screen with certain rectangle size of confirming, is divided into several zonules, and each zone is a little rectangle.
Second step, obtain the zone that image changes in the present frame, and such region of variation and the rectangular area in the first step are compared, from these rectangular areas, get rid of the zone that does not change.
The 3rd step, handle one by one for each zonule that changes, itself and the pictorial information of each zonule in the frame are before compared, if consistent then only need the positional information of the record zonule consistent with it; If inconsistent, then certain still image compression method to be adopted in this zonule, and preserve the data after the compression, other zonule after being used for compares with it.
They can set the image quality of coding according to different needs, and the therefore data volume of estimated next frame of the 3rd of following step 2 the step in the present embodiment can be used as according to the quality of setting the image that is produced behind the screen coding here.
Screen message often has the few characteristic of region of variation, and above-mentioned screen coding has made full use of this characteristic just, is that processing unit is handled with the rectangular area, and any concrete screen coding that conforms to this characteristics all is suitable for herein.Several ripe relatively methods are arranged at present, like Hextile, ZRLE etc. in the screen coding field.
In the present embodiment step 2,, use the method for step 1 that screen message is encoded, and carry out the Rate Control of piecemeal timesharing, coding back information is represented that with the form of sheet each interFrameGap time is sent a sheet to the recipient according to the frame per second of confirming.Described frame per second is meant the number that needs the frame of coding in the unit interval, in the application of screen coding, is generally per second 2 frame to 5 frames.As needing real-time screen transmission, then also need the designated key frame per second in the practical application.Described crucial frame per second is meant quantity of key frames in the unit interval, like per 10 seconds 1 key frames.Described key frame is meant in the described screen coding of step 1, and a complete coding of needs and its each subregion that is encoded do not rely on the independently frame of the pictorial information of other frame.
The Rate Control of the piecemeal timesharing here is meant through the pictorial information piecemeal of a frame is handled, the information of each piecemeal behind the piecemeal is kept in the film trasport formation to be passed, and the bit rate control method that goes in the process to the processing of frame one by one after assigning to.Film trasport formation to be passed wherein is to be used for preserving the formation that screen image divides block message, these minutes block message be kept in this formation with the form of sheet, when timesharing is transmitted, from this formation, extracting sheet information can transmit.
Described, be meant handle through coding in the present embodiment step and Rate Control after, will be in each interFrameGap quilt information transmitted unit one by one in the time.
Described to the processing of frame one by one, its substep is following:
The first step is checked current treatment state, and sets the parameter of the screen coding of above-mentioned steps one according to the data predicted amount.If inspection is not passed through, check film trasport formation to be passed, when this formation is not sky, from formation, takes out next sheet and be transferred to the recipient; If this formation is empty, then revises current state and be: allow coding.
Described current treatment state is meant: employed a kind of Status Flag in the present embodiment, one of following several kinds of states of its its ordinary representation: allow coding; The suggestion coding; Do not allow coding.Under the state that allows coding, for the check result of current treatment state for passing through; Under the state of suggestion coding, can whether pass through according to the actual conditions judged result, for example can stipulate: if current data predicted amount is no more than the ratio of limit bit rate and frame per second, then check result is for passing through, otherwise the result is not for passing through; Under the state that does not allow to encode, for the check result of current treatment state for not passing through.When initial, current treatment state is set at: the suggestion coding.
If specified key frame, and the current frame of handling is key frame, with the inspection of forcing through here.
Described data predicted amount is meant: for the predicted value that can produce how many data volumes behind the present frame coding, it was undertaken by following the 3rd step, and the data predicted amount is set to the ratio of limit bit rate and frame per second when initial.
The parameter of described screen coding is meant: in order to the parameter of adjustment coding, they influence encoding quality, efficient usually in the screen coding, and higher quality can cause bigger data volume, and are therefore relevant with the data predicted amount.
In second step,, then use above-mentioned steps one to encode if the inspection of the first step is passed through; If do not pass through then the processing end of present frame.
In the 3rd step, analyze the data volume of present frame, and estimate the data volume of next frame.
The data volume of described analysis present frame is meant: the data total amount that obtains the coding result generation of present frame.For example present frame possibly comprise the data volume of 100Kbyte.
The data volume of described estimation next frame is meant: according to the data volume of continuous some frames, perhaps whether next frame is key frame, predicts the data volume of next frame through a kind of mathematical method.The prediction purpose here is for the screen coding in the above-mentioned steps one provides reference, is used for setting the image quality in some screen codings.In the practical implementation, can adopt following method, but be not limited to this exemplary method:
If next frame is a key frame, then according to before the mean value of data volume of some key frames predict the data volume of next frame; If next frame is not a key frame, then according to before the mean value of data volume of some non-key frames, and variation tendency is predicted the data volume of next frame.About the prediction of the data volume of non-key frame, a kind of predictor formula of example is as follows:
Y(n+1)＝m[Y(n)-Y(n-1)]+(1-m)P(n)，0＜m＜1
The average amount of n frame before P in the formula (n) representative, Y (i) represents the data volume of i frame, and to be predicted is the data volume of n+1 frame, and m is a parameter.
In the 4th step, the Rate Control of execution piecemeal timesharing is revised current treatment state, transmits a sheet to the recipient.
The Rate Control of described execution piecemeal timesharing is meant: if data volume has surpassed the ratio of limit bit rate and frame per second, then data will be performed the branch block operations, and each piece that obtains behind the piecemeal is saved in film trasport formation to be passed with the form of sheet.Described minute block operations is meant: under the frame per second of current setting, how many pieces are the data volume of calculating present frame need be divided into, and the data volume that makes each piece is no more than the ratio of limit bit rate and frame per second after converting the data volume of unit interval into.For example, if frame per second is per second 2 frames, limit bit rate is per second 64Kbyte; If the data volume of present frame is 100Kbyte, convert into be the unit interval with 1 second after, being counted as 1 second data volume is 200Kbyte; Then this frame will be divided into 4 pieces, and each piece 50Kbyte just in time is no more than limit bit rate.The data of present frame actual transmissions are first in these piecemeals, therefore first sheet in the film trasport formation to be passed are taken out and send the recipient to.
If data volume is no more than the ratio of limit bit rate and frame per second, the data that then coding result of present frame produced send the recipient to the form of a sheet.
In a complete image, divide block operations can adopt following several kinds of schemes, but be not limited to these schemes:
1. press the mode of row piecemeal.For example be divided into 2 piecemeals if desired, can odd-numbered line be divided into first, even number line is divided into second; Also can the first half of screen be divided into first piece, the latter half is divided into second piece.
2. press the mode of area dividing.If for example need be divided into 4 piecemeals, then visual level, vertical direction to be divided equally respectively, thereby be divided into 4 zones, each zone is a piecemeal.
The current treatment state of described modification is meant under the situation of data volume above the ratio of limit bit rate and frame per second, revises current treatment state and is: do not allow coding; Be no more than in data volume under the situation of ratio of limit bit rate and frame per second, revise current treatment state and be: the suggestion coding.
In the present embodiment step 3, the recipient receives each sheet one by one, carries out the screen decoding corresponding with the screen coding of step 1.Wherein, described recipient is meant: in practical application, and a side who receives screen message and be used, this utilization can be that information is shown on certain display screen.The sheet that step 2 is sent one by one can send to a plurality of recipients simultaneously.
Recipient described in the step 3 receives each sheet one by one, carries out the screen decoding corresponding with the screen coding of step 1, comprises following substep:
The first step is carried out data analysis to working as anter, and the use screen decoding corresponding with the screen coding of step 1 handled.Described data analysis is meant: it is the information of having represented a complete screen image that anter is worked as in analysis, has still represented the information of certain piecemeal of screen image.
In second step, be presented at the information after the decoding processing on recipient's screen.If when anter is represented the information of certain piecemeal of screen image, then on the update displayed screen to zone that should piecemeal.
As shown in Figure 2, be the application scheme of embodiment in the real time remote Web-based instruction.
Present embodiment at first selects to use certain screen coding, confirms limit bit rate, then regularly obtains screen message, and the information of at every turn obtaining is encoded and Rate Control to it as a frame.At last coding result is sent to the recipient with the form of sheet, the recipient shows screen message through the decoding process of correspondence, watches on-the-spot screen.Network Transmission in the scheme can send any a plurality of receiving terminal simultaneously to.
Present embodiment is to common computer screen condition, and network condition, and according to the network condition of receiving terminal limit bit rate being set is per second 128Kbyte.Present embodiment is selected a kind of coding that carries out as follows:
The first step is unit with computer screen with certain rectangle size of confirming, is divided into several zonules, and each zone is a little rectangle.
Second step, obtain the zone that image changes in the present frame, and such region of variation and the rectangular area in the first step are compared, from these rectangular areas, get rid of the zone that does not change.
The 3rd step; Handle one by one each zonule that changes for remaining; Itself and the pictorial information of each zonule in the frame are before compared, if the consistent then pictorial information of the whole zonule of need not encoding only needs the positional information of the record zonule consistent with it; If inconsistent, then special compression method is adopted in this zonule, analyze the situation of image color in this zone; According to comprising the how many kinds of color in the zone; Adopt different processing methods, its principle is: for the less situation of color category, at first preserve the information of every kind of color; For each position in the zone, preserve it and belong to any this information in these colors afterwards; For the more situation of color category, adopt this area information of JPEG method compression commonly used in the image compression.
In addition, screen coding such as common Hextile, ZRLE also can be used for here.
In the present embodiment, setting fixing frame per second is per second 2 frames, and the piecemeal time-sharing method that then coding, and use present embodiment proposes carries out Rate Control.Present embodiment designated key frame per second is per 10 seconds key frames.
Because setting frame per second is per second 2 frames, under the limit bit rate condition of per second 128Kbyte, the data volume of every frame will be limited in below the 64Kbyte.In the process of each frame of handling screen image one by one, after each frame disposes, there are two kinds of possible processing modes:
1. the data volume of present frame is bigger, surpasses per second 64Kbyte, need carry out the branch block operations.Use the mode of pressing area dividing in the present embodiment.For example; If the data volume of present frame is 200Kbyte; Then according to the piecemeal scheme; Need that whole screen image is divided into 4 piecemeals and transmit, " coding and Rate Control process " shown in figure part has explained that as a kind of example how to be divided into 4 piecemeals to a complete image also transmits with the form of sheet one by one.
2. the data volume of present frame does not reach 64Kbyte, need not carry out piecemeal and handle, and then directly transmits the result of whole screen coding." coding and Rate Control process " part also has the explanation of some data contents that under the situation that does not need piecemeal, transmit except that the branch block operations has been described in the drawings, promptly only transmits the screen area data that change.
Data behind the coding are transferred to one or more recipients, and the recipient carries out corresponding screen decoding, can play real-time teaching screen.Therefore the recipient can upgrade the pictorial information in the zone of this sheet representative on the screen at every turn when receiving each sheet, if receive only first sheet that certain piecemeal produces, then only upgraded in the screen 1/4th zone.
Claims (5)
1. the bit rate control method of a screen coding is characterized in that, may further comprise the steps:
Step 1 is selected the computer screen Methods for Coding, and limit bit rate is set;
Step 2 according to the frame per second of confirming, is used the method for step 1 that screen message is encoded, and is carried out the Rate Control of piecemeal timesharing, and coding back information is represented that with the form of sheet each interFrameGap time is sent a sheet to the recipient;
The Rate Control of described piecemeal timesharing is meant through the pictorial information piecemeal of a frame is handled, and the information of each piecemeal behind the piecemeal is kept in the film trasport formation to be passed; And the bit rate control method that goes in the process to the processing of frame one by one after assigning to; Wherein, described film trasport formation to be passed is to preserve the formation that screen image divides block message; These minutes, block message was kept in this formation with the form of sheet, and when timesharing is transmitted, from this formation, extracting sheet information can transmit;
Step 3, the recipient receives each sheet one by one, carries out the screen decoding corresponding with step 1;
Described substep to the processing of frame one by one is following:
The first step is checked current treatment state, and sets the screen coding parameter of above-mentioned steps one according to the data predicted amount, if inspection is not passed through, checks film trasport formation to be passed, and when this formation when be empty, the next sheet of taking-up is transferred to the recipient from formation; If this formation is empty, then revises current state and be: allow coding;
In second step,, then use above-mentioned steps one to encode if the inspection of the first step is passed through; If do not pass through then the processing end of present frame;
In the 3rd step, analyze the data volume of present frame, and estimate the data volume of next frame;
In the 4th step, the Rate Control of execution piecemeal timesharing is revised current treatment state, transmits a sheet to the recipient;
Described current treatment state is meant: employed a kind of Status Flag, and it representes one of following several kinds of states: allow coding; The suggestion coding; Do not allow coding; Under the state that allows coding, for the check result of current treatment state for passing through; Under the state of suggestion coding, whether pass through by actual embodiment decision for the check result of current treatment state; Under the state that does not allow to encode, for the check result of current treatment state for not passing through;
The Rate Control of described execution piecemeal timesharing is meant: if data volume has surpassed the ratio of limit bit rate and frame per second, then data will be performed the branch block operations, and each piece that obtains behind the piecemeal is saved in film trasport formation to be passed with the form of sheet;
Described minute block operations is meant: under the frame per second of current setting, how many pieces are the data volume of calculating present frame need be divided into, and the data volume that makes each piece is no more than the ratio of limit bit rate and frame per second after converting the data volume of unit interval into.
2. the bit rate control method of screen coding according to claim 1; It is characterized in that the computer screen coding described in the step 1 is meant computer screen information is carried out processed compressed; Thereby the data volume that screen message is comprised reduces significantly; Corresponding with it is the screen decoding, according to the data of having carried out processed compressed, and the screen image before the reduction compression.
3. according to the bit rate control method of claim 1 or 2 described screen codings, it is characterized in that described screen coding comprises following substep:
The first step is unit with computer screen with certain rectangle size of confirming, is divided into several zonules, and each zone is a little rectangle;
Second step, obtain the zone that image changes in the present frame, and such region of variation and the rectangular area in the first step are compared, from these rectangular areas, get rid of the zone that does not change;
The 3rd step, handle one by one for each zonule that changes, itself and the pictorial information of each zonule in the frame are before compared, if consistent then only need the positional information of the record zonule consistent with it; If inconsistent, then certain still image compression method to be adopted in this zonule, and preserve the data after the compression, other zonule after being used for compares with it.
4. the bit rate control method of screen coding according to claim 1 is characterized in that, the frame per second that the basis described in the step 2 is confirmed; Use the method for step 1 that screen message is encoded, and carry out the Rate Control of piecemeal timesharing, coding back information is represented with the form of sheet; Each interFrameGap time is sent a sheet to the recipient; Described, be meant: after handling through coding in this step and Rate Control, will be in each interFrameGap quilt information transmitted unit one by one in the time.
5. the bit rate control method of screen coding according to claim 1 is characterized in that, the recipient described in the step 3 receives each sheet one by one, carries out the screen decoding corresponding with step 2, comprises following substep:
The first step is carried out data analysis to working as anter, and the use screen decoding corresponding with the screen coding of step 2 handled; Described data analysis refer to analyze when anter be the information of having represented a complete screen image, still represented the information of certain piecemeal of screen image;
Second step was presented at the information after the decoding processing on recipient's screen, if represent the information of certain piecemeal of screen image when anter, then on the update displayed screen to zone that should piecemeal.
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| CN 200910054923 CN101651827B (en) | 2009-07-16 | 2009-07-16 | Code rate control method of screen coding |
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