CN102510494B - Method and device for synchronizing I frame - Google Patents
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Abstract
The invention provides a method for synchronizing I frame. When performing video full-view splicing, encoding devices acquire synchronous data from a reference encoding device, and perform I frame synchronization with the reference encoding device according to the acquired synchronous data. The invention can enhance the image quality and performance of video full-view splicing.
Description
Technical field
The present invention relates to Image Mosaics technology, particularly I frame is carried out to synchronous method and apparatus.
Background technology
First some concepts that the present invention relates to are carried out to brief description below:
A GOP (picture group, Group of Pictures) is exactly one group of continuous picture.Mpeg encoded technology is divided into three kinds of I frames, P frame, B frame by picture (being frame).Wherein: I is intra-coded frame, P is forward predicted frame, and B is two-way interpolation frame.Say simply, I frame is a complete picture, is first frame of each GOP, and P frame and B frame recording is the variation with respect to I frame, and P frame is predicted by the P frame before it or I frame.There is no I frame, P frame and B frame just cannot be decoded.
The length of GOP (or being called the GOP cycle) is the interval that an I frame arrives next I frame, and an I frame appears in how many frames the inside.
In supervisory control system, video panorama splicing business is that the Image Mosaics of the video camera from several IP network video cameras (IPC) or encoder (EC, Encoder) is become to large picture image.
Video panorama splicing business is identical with common monitoring business, has live image to play and historical playback.The general front monitoring front-end that adopts of historical video recording storage is directly deposited pattern, and the video flowing that each IPC or EC are produced carries out separate, stored.
One of challenge of implementing video panorama splicing is exactly: because each IPC or EC have separately independently encoded clock, make I frame at the GOP of each IPC or EC the distributing position in the cycle different.For live image is play, after stitching image, if I frame is asynchronous, at splicing edge, will cause image quality reduction.In addition, for lasting playback, when playback F.F. and rewind down, general the I frame in stored history image is decoded, because the I frame of each history image in stitching image is asynchronous, making all to decode just can reach to I frame and P frame synchronizes F.F. and rewind down, and this will reduce performance greatly.
Summary of the invention
The invention provides and a kind of I frame is carried out to synchronous method and apparatus, while monitoring image being carried out to video panorama splicing to solve, due to problems such as asynchronous the caused image quality reduction of I frame, hydraulic performance declines.
Provided by the inventionly a kind of I frame is carried out to synchronous method, is applied to video panorama splicing, comprising:
Encoding device obtains synchrodata to the baseline encoded equipment in the splicing of described video panorama, and calculates poor and intra-coded frame (I frame) the relativity shift value of frame number between himself and baseline encoded equipment according to obtained synchrodata;
Encoding device determines that according to the I frame relativity shift value calculating himself produces the moment of I frame, and employing picture group (GOP) length identical with baseline encoded equipment produces I frame.
A kind of method of carrying out video panorama splicing provided by the invention, comprising:
Each encoding device and the frame number between baseline encoded equipment that receive except baseline encoded equipment are poor, and receive the video flowing of each encoding device that participates in video panorama splicing;
According to the video flowing receiving and the poor video panorama splicing live image that carries out of frame number, play and/or historical playback.
A kind of encoding device provided by the invention, is applied to video panorama splicing, comprising: synchronization module and video generation module;
Synchronization module, obtains synchrodata for the baseline encoded equipment to the splicing of described video panorama, and calculates the poor and I frame relativity shift value of frame number between himself and baseline encoded equipment according to obtained synchrodata;
Video generation module, for determining that according to the I frame relativity shift value calculating himself produces the moment of I frame, and employing picture group (GOP) length identical with baseline encoded equipment produces I frame.
An equipment that carries out video panorama splicing, is characterized in that, comprising: receiver module and concatenation module;
Receiver module, for receiving the video flowing of each encoding device that participates in video panorama splicing, and poor for each encoding device and the frame number between baseline encoded equipment that receive except baseline encoded equipment;
Concatenation module, for playing and/or historical playback according to the video flowing receiving and the poor video panorama splicing live image that carries out of frame number.
As seen from the above technical solution, provided by the invention I frame is carried out to synchronous method and apparatus, when carrying out video panorama splicing, in the encoding device that participates in video panorama splicing, determine a baseline encoded equipment, other encoding devices obtain synchrodata to this baseline encoded equipment, and carry out I frame synchronization according to obtained synchrodata and baseline encoded equipment, thereby make to participate in the I frame synchronization between each encoding device of video panorama splicing, the live image that has improved video panorama splicing is play and image quality and the performance of historical playback.
Accompanying drawing explanation
Fig. 1 is the position relationship schematic diagram between encoding device in a preferred embodiment of the present invention;
Fig. 2 is each parameter and sequential relationship schematic diagram in a preferred embodiment of the present invention;
Fig. 3 is the composition structural representation of the present invention's one better encoding device;
Fig. 4 is the better composition structural representation that carries out the equipment of video panorama splicing of the present invention one.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
Main thought of the present invention is: when carrying out video panorama splicing, in the encoding device that participates in video panorama splicing, determine a baseline encoded equipment, other encoding devices obtain synchrodata to this baseline encoded equipment, and carry out I frame synchronization according to obtained synchrodata and baseline encoded equipment, thereby make to participate in the I frame synchronization between each encoding device of video panorama splicing, the live image that improves video panorama splicing is play and image quality and the performance of historical playback.
Preferably, can the encoding device of the video source device in the position that keeps left between two parties in video panorama splicing be defined as to baseline encoded equipment by video management server, the encoding device of selection in the position that keeps left between two parties as the reason of baseline encoded equipment is: the time deviation between the encoding device of the position that keeps left between two parties and the encoding device on both sides is all less, and, more balanced with the distance of the encoding device on both sides.Certainly, also can select in actual applications encoding device in other positions as baseline encoded equipment.
Be assumed to be 3 IPC and carry out video panorama splicing, as shown in Figure 1,3 IPC are respectively: IPC1, IPC2, IPC3.According to main thought of the present invention, video panorama splicing business (comprises that live image is play or history image is stored) when carrying out, the encoding device that video management server can be selected IPC1 is baseline encoded equipment (hereinafter referred to as benchmark IPC), and requires the encoding device of IPC2 and IPC3 to the encoding device of IPC1, to obtain synchrodata respectively.For simplified characterization, in the following embodiments, by the encoding device of IPC1, IPC2 and IPC3 respectively referred to as IPC1, IPC2 and IPC3.Except the application scenarios of the IPC shown in Fig. 1, different cameras connects the scene that different encoders carries out video panorama splicing also can apply the technology of the present invention.
Take application scenarios shown in Fig. 1 as example, referring to Fig. 2, the realization flow of synchronous method provided by the present invention is elaborated.
The 1st step: IPC2 waits for that video I frame produces, and the timestamp that records current I frame is t1, frame number f1, to IPC1, sends synchronization request message, carries: timestamp t2, t1 and f1 when this message is left IPC2 in this message.
The 2nd step: when synchronization request message arrives IPC1, IPC1 logging timestamp t3.
The 3rd step: IPC1 waits for that video I frame produces, the timestamp that records current I frame is t4 and frame number f2, IPC1 feeds back synchronous response message to IPC2, in this message, carries: the I frame period GOP parameter of timestamp t5, t1 when this message is left IPC1, t2, t3, t4, f1, f2, IPC1, video code model (as H264), video resolution.
When the 4th step: IPC2 receives from the synchronous response message of IPC1, logging timestamp t6.
The 5th step: IPC2 carries out lower column count:
1) calculate IPC2 with respect to the time difference of IPC1: toff=((t3-t2)+(t5-t6))/2.
2) when the I frame of calculating IPC1 produces, be engraved in upper corresponding timestamp: the t4 '=t4-toff of IPC2.
3) calculate the time difference of the I frame of IPC2 and the I frame of IPC1: offset=t4 '-t1.
4) when the I frame of calculating IPC1 produces, being engraved in upper corresponding frame number: the f3=(f1+offset/ frame period) of IPC2 rounds.
That is to say, during the I frame of the I frame of IPC2 alignment IPC1, frame number f3 should be an I frame on IPC2.
Interframe is divided into the time difference between two frames, and in China, vision signal is generally PAL (25 frame/second), and interframe is divided into 40ms, and the present invention requires IPC1, IPC2 and IPC3 to have identical frame per second (that is: frame period).Here, because frame number is integer, need to round result of calculation, the concrete strategy that rounds can be to round up.
5) calculate I frame relativity shift value: f4=f3mod (the GOP value of IPC1);
Here, I frame relativity shift value refers to: during the I frame of the I frame of IPC2 alignment IPC1, and in a GOP length, the deviant of the I frame frame number of IPC2.Because I frame is periodically to produce, I frame when alignment by from the I frame of IPC2 to IPC1, the moment that need to produce I frame to IPC2 is adjusted, make it identical with the moment of IPC1 generation I frame, the I frame relativity shift value that this step calculates is exactly the frame number that need to adjust while producing I frame at IPC2 place.
6) frame number of the relative IPC1 of calculating synchronization IPC2 is poor: f5=f3-f2.
The 6th step: IPC2 processes: record the poor f5 of frame number of IPC2 and IPC1 synchronization, for the live image broadcasting of client and the frame synchronization of historical playback; It is identical with the GOP length of IPC1 that the GOP length of IPC2 is set to, and setting video code model and the video resolution identical with IPC1, and I frame relativity shift value f4 is set.
Carry out after above-mentioned setting, IPC2 determines according to set f4 and GOP length the moment that produces I frame, and adopts set GOP length, video code model and video resolution to produce I frame, can realize I frame with IPC1 and align.For example:
Suppose that frame number f1 is 2004, frame number f2 is that the time difference of 1002, IPC2 and IPC1 is 4 seconds, and interframe is divided into 0.04 second (25 frame per second), and the GOP value of IPC1 is 30;
So, f3=2004+4/0.04=2104, f4=2104 is to 30 delivery=4.
If the present frame sequence number value of IPC2 is 2300, next I frame calculates: 2300+4+30-(2300 pairs of 30 deliverys) is=2314, in the sequence number moment that is defined as producing to the nearest nearest I frame producing of next frame expection the corresponding moment of frame number 2314, the sequence number of nearest next I frame is exactly 2314.
So far, complete synchronizeing between IPC2 and IPC1.Synchronizeing and can carry out according to the method described above between IPC3 and IPC1, and two kinds synchronously can be carried out simultaneously.
In the present invention, the video flowing that IPC1, IPC2, IPC3 are produced or separate, stored, IPC2 records its poor f5 of frame number of relative IPC1 separately with IPC3.
When client is carried out live play or playback, client is from the live stream of IPC1, IPC2, IPC3, and the frame number of relative IPC1 is poor separately from IPC2 and IPC3, to receive it, and when carrying out video panorama splicing, according to frame number is poor, splice, thereby guarantee frame synchronization.For example:
The poor f5 of frame number that supposes IPC2 and IPC1 is 100 frames, client receives that the frame number of IPC2 packet is 10106, the frame number of IPC1 packet is 10001, the packet of buffer memory IPC2, while being 10006 packet Deng the frame number of receiving IPC1, decoding, splice together with the packet that be just 10006 packets by the frame number of IPC1 is 10106 with the frame number of IPC2.
Corresponding to said method, the invention provides a kind of encoding device as shown in Figure 3, this encoding device is applied to video panorama splicing, comprising: synchronization module 310 and video generation module 320.Wherein:
Synchronization module 310, obtains synchrodata for the baseline encoded equipment to the splicing of described video panorama, and calculates the poor and I frame relativity shift value of frame number between himself and baseline encoded equipment according to obtained synchrodata;
Video generation module 320, for determining that according to the I frame relativity shift value calculating himself produces the moment of I frame, and employing picture group (GOP) length identical with baseline encoded equipment produces I frame.
Synchronization module 310 shown in Fig. 3 in encoding device can be for carrying out following operation:
The timestamp t1 of the I frame of the current generation of recording of video generation module and frame number f1, send synchronization request message to baseline encoded equipment, carries: this message is left the timestamp t2 of described encoding device, and t1 and f1 in message;
From baseline encoded equipment, receive synchronous response message, logging timestamp t6, in described synchronous response message, carry: this synchronous response message is left the timestamp t5 of baseline encoded equipment, timestamp t3, baseline encoded equipment that baseline encoded equipment is received described synchronization request message and received timestamp t4 and the frame number f2 that produces I frame after described synchronization request message, and GOP length, video code model and the video resolution of t1, t2, f1, baseline encoded equipment;
Calculate described encoding device with respect to the time difference of baseline encoded equipment: toff=((t3-t2)+(t5-t6))/2;
The I frame of calculating baseline encoded equipment is engraved in timestamp corresponding on described encoding device: t4 '=t4-toff while producing;
Calculate the time difference of the I frame of described encoding device and the I frame of baseline encoded equipment: offset=t4 '-t1;
The I frame of calculating baseline encoded equipment is engraved in frame number corresponding on described encoding device while producing: f3=(f1+offset/ frame period) rounds;
Calculate the I frame relativity shift value of described encoding device: f4=f3mod (the GOP length of baseline encoded equipment);
The frame number that calculates described encoding device relative datum encoding device is poor: f5=f3-f2.
The present invention also provides a kind of equipment that carries out video panorama splicing as shown in Figure 4, and this equipment comprises: receiver module 410 and concatenation module 420.Wherein:
Receiver module 410, for receiving the video flowing of each encoding device that participates in video panorama splicing, and poor for each encoding device and the frame number between baseline encoded equipment that receive except baseline encoded equipment;
Concatenation module 420, for playing and/or historical playback according to the video flowing receiving and the poor video panorama splicing live image that carries out of frame number.
Concatenation module 420 in Fig. 4 apparatus shown, the packet of usining in the video flowing of received baseline encoded equipment is as benchmark, in the difference of the frame number of packet of the current encoding device receiving and the frame number of the packet of baseline encoded equipment, be greater than the frame number of described encoding device when poor, be used for the data pack buffer of described encoding device, in the difference of the frame number of packet of the current encoding device receiving and the frame number of the packet of baseline encoded equipment, be less than the frame number of described encoding device when poor, for abandoning the packet of described baseline encoded equipment, and for decoding together with the corresponding data bag that deducts its corresponding frame number packet equal with the frame number of baseline encoded equipment and baseline encoded equipment after poor of each encoding device, and decoded image is spliced.
The present invention also provides a kind of method of carrying out video panorama splicing, comprising:
Each encoding device and the frame number between baseline encoded equipment that receive except baseline encoded equipment are poor, and receive the video flowing of each encoding device that participates in video panorama splicing;
According to the video flowing receiving and the poor video panorama splicing live image that carries out of frame number, play and/or historical playback.
In said method, the video flowing that described basis receives and frame number be poor to carry out video panorama splicing and comprises: the packet of usining in the video flowing of received baseline encoded equipment is as benchmark, it is poor that if the difference of the frame number of the packet of the frame number of the packet of the encoding device receiving current and baseline encoded equipment is greater than the frame number of described encoding device, the packet of encoding device described in buffer memory, it is poor that if the difference of the frame number of the packet of the frame number of the packet of the encoding device receiving current and baseline encoded equipment is less than the frame number of described encoding device, abandon the packet of described encoding device, together with the corresponding data bag that deducts its corresponding frame number packet equal with the frame number of baseline encoded equipment and baseline encoded equipment after poor of each encoding device, decode, and decoded image is spliced.
As seen from the above-described embodiment, provided by the invention I frame is carried out to synchronous method and apparatus, when carrying out video panorama splicing, in the encoding device that participates in video panorama splicing, determine a baseline encoded equipment, other encoding devices obtain synchrodata to this baseline encoded equipment, and carry out I frame synchronization according to obtained synchrodata and baseline encoded equipment, thereby make to participate in the I frame synchronization between each encoding device of video panorama splicing, the live image that has improved video panorama splicing is play and image quality and the performance of historical playback.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (5)
1. I frame is carried out to a synchronous method, is applied to video panorama splicing, it is characterized in that, comprising:
The baseline encoded equipment of encoding device from the splicing of described video panorama obtains synchrodata, and calculates the poor and I frame relativity shift value of frame number between himself and baseline encoded equipment according to obtained synchrodata;
Encoding device determines that according to the I frame relativity shift value calculating himself produces the moment of I frame, and the employing picture group GOP length identical with baseline encoded equipment produces I frame.
2. method according to claim 1, is characterized in that, the method further comprises:
Participate in the video flowing that the encoding device of video panorama splicing produces self and send to equipment and/or the memory device that carries out video panorama splicing, the encoding device except described baseline encoded equipment is by the equipment and/or the memory device that carry out video panorama splicing described in poor the sending to of frame number between himself and baseline encoded equipment.
3. method according to claim 1 and 2, is characterized in that:
The described synchrodata of obtaining comprises:
Encoding device records timestamp t1 and the frame number f1 of the I frame of self current generation, to baseline encoded equipment, sends synchronization request message, carries: this message is left the timestamp t2 of described encoding device, and t1 and f1 in message;
From baseline encoded equipment, receive synchronous response message, logging timestamp t6, in described synchronous response message, carry: this synchronous response message is left the timestamp t5 of baseline encoded equipment, timestamp t3, baseline encoded equipment that baseline encoded equipment is received described synchronization request message and received timestamp t4 and the frame number f2 that produces I frame after described synchronization request message, and GOP length, video code model and the video resolution of t1, t2, f1, baseline encoded equipment;
Poor and the I frame relativity shift value of frame number between described calculating himself and baseline encoded equipment comprises:
Calculate described encoding device with respect to the time difference of baseline encoded equipment: toff=((t3-t2)+(t5-t6))/2;
The I frame of calculating baseline encoded equipment is engraved in timestamp corresponding on described encoding device: t4 '=t4-toff while producing;
Calculate the time difference of the I frame of described encoding device and the I frame of baseline encoded equipment: offset=t4 ’ – t1;
The I frame of calculating baseline encoded equipment is engraved in frame number corresponding on described encoding device while producing: f3=(f1+offset/ frame period) round;
Calculate the I frame relativity shift value of described encoding device: the GOP length of f4=f3mod(baseline encoded equipment);
The frame number that calculates described encoding device relative datum encoding device is poor: f5=f3-f2.
4. an encoding device, is applied to video panorama splicing, it is characterized in that, comprising: synchronization module and video generation module;
Synchronization module, for obtaining synchrodata from the baseline encoded equipment of described video panorama splicing, and calculates the poor and I frame relativity shift value of frame number between himself and baseline encoded equipment according to obtained synchrodata;
Video generation module, for determining that according to the I frame relativity shift value calculating himself produces the moment of I frame, and the employing picture group GOP length identical with baseline encoded equipment produces I frame.
5. encoding device according to claim 4, is characterized in that, described synchronization module is used for carrying out following operation:
The timestamp t1 of the I frame of the current generation of recording of video generation module and frame number f1, send synchronization request message to baseline encoded equipment, carries: this message is left the timestamp t2 of described encoding device, and t1 and f1 in message;
From baseline encoded equipment, receive synchronous response message, logging timestamp t6, in described synchronous response message, carry: this synchronous response message is left the timestamp t5 of baseline encoded equipment, timestamp t3, baseline encoded equipment that baseline encoded equipment is received described synchronization request message and received timestamp t4 and the frame number f2 that produces I frame after described synchronization request message, and GOP length, video code model and the video resolution of t1, t2, f1, baseline encoded equipment;
Calculate described encoding device with respect to the time difference of baseline encoded equipment: toff=((t3-t2)+(t5-t6))/2;
The I frame of calculating baseline encoded equipment is engraved in timestamp corresponding on described encoding device: t4 '=t4-toff while producing;
Calculate the time difference of the I frame of described encoding device and the I frame of baseline encoded equipment: offset=t4 ’ – t1;
The I frame of calculating baseline encoded equipment is engraved in frame number corresponding on described encoding device while producing: f3=(f1+offset/ frame period) round;
Calculate the I frame relativity shift value of described encoding device: the GOP length of f4=f3mod(baseline encoded equipment);
The frame number that calculates described encoding device relative datum encoding device is poor: f5=f3-f2.
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| CN103795979B (en) * | 2014-01-23 | 2017-04-19 | 浙江宇视科技有限公司 | Method and device for synchronizing distributed image stitching |
| CN103763556B (en) * | 2014-01-29 | 2018-03-06 | 广东威创视讯科技股份有限公司 | Video image encoding and decoding devices and methods therefor, Transmission system and its method |
| CN105306837A (en) * | 2015-10-27 | 2016-02-03 | 浙江宇视科技有限公司 | Multi-image splicing method and device |
| CN106027886B (en) * | 2016-05-17 | 2019-08-06 | 深圳市极酷威视科技有限公司 | A kind of panoramic video realizes the method and system of synchronization frame |
| CN109936746B (en) | 2016-12-30 | 2021-07-16 | 深圳市大疆创新科技有限公司 | Image processing method and apparatus |
| CN107113441B (en) | 2016-12-30 | 2019-07-26 | 深圳市大疆创新科技有限公司 | Image processing method, device, unmanned vehicle and receiving end |
| WO2018121775A1 (en) * | 2016-12-30 | 2018-07-05 | SZ DJI Technology Co., Ltd. | System and methods for feedback-based data transmission |
| JP7208530B2 (en) * | 2019-05-31 | 2023-01-19 | 日本電信電話株式会社 | Synchronization control device, synchronization control method and synchronization control program |
| CN111417005B (en) * | 2020-04-27 | 2022-02-08 | 北京淳中科技股份有限公司 | Video signal synchronous encoding method, device, system and encoding end |
| CN117499712A (en) * | 2022-07-26 | 2024-02-02 | 华为技术有限公司 | Synchronization method, system and electronic equipment |
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