CN104980697A - Video transmission method for web camera - Google Patents
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Abstract
The invention relates to a video transmission method for a web camera. The video transmission method for the web camera comprises the steps as follows: 1) the web camera establishes connection with a client program through the Internet; 2) a client generates control information according to current manual or automatic operation and transmits the web camera; 3) the web camera processes pictures collected by a sensor according to the received instruction; 4) the web camera performs video streaming coding to a processed image sequence; 5) the web camera embeds the play information based by processing the video streaming in the video streaming and transmits to the client, or transmits to the client with an individual data format via a networking protocol; 6) the client decodes and displays according to the received video streaming and play information; 7) the second step to the sixth step is repeated while the play information of the client is changed. The method of the invention solves the problem of providing the high-quality, high-fluency and high-definition video to a user when the bandwidth is not enough.
Description
Technical field
The present invention relates to a kind of web camera video transmission method.
Background technology
Web camera conventional at present, its resolution can reach 300 ten thousand to 1,200 ten thousand, along with improving constantly of user's request, also can be more and more higher to the requirement of resolution, frame per second.Through the video flowing that Coding Compression Technology obtains, upload in time in network, send to other-end, realize the real-time viewing of user, and such function, need transmission per second up to the even higher data flow of 8Mbit.
The real-time video playing function of web camera, it is the request protocol according to user, by captured in real-time to picture image compressed encoding become video flowing (as H.264/H.265/MPEG4 etc.), according to certain agreement (as RTSP/ proprietary protocol etc.), by the terminal that network sends to user to use, carry out decoding again to play, make user can watch photographed scene picture in real time at a distance.
For panorama camera, because its shooting picture is special, exist and distort in a large number, need special image procossing to show just to make beholder be easier to accept.Fig. 1 is exactly that a kind of transparent effect processes panoramic picture, and simulation The Cloud Terrace PTZ shows sub-fraction region (framework of lower left corner panoramic picture is inner) wherein.
Along with the development of hardware technology, the resolution of current video camera is more and more higher, and cause Video coding to increase with decoding expense, video stream data amount also becomes large, in some cases, the hardware resource that the bandwidth that provides of network and encoding and decoding provide can not meet complete transmission of video requirement.This problem is particularly outstanding when panorama camera is applied, and (panoramic camera major function is by 180 ° even image of 360 ° around the shooting of special imaging system, by the image digitazation collected, carry out compressed encoding, send to user to watch by network.Scope due to shooting wants that its resolution requirements also requires higher than general video camera when extensive).
When the video of high quality, high fluency, high definition, its data traffic also can correspondingly improve, and just because of this, the overall viewing effect of video is subject to the strict restriction of network bandwidth conditions, flow condition and encoding device and playback equipment software and hardware condition.
Under local area network (LAN) (or other dedicated networks) condition, because bandwidth resources are enriched, so the video data transmission of high code stream can be born, but when wide area network is applied (application as based on the Internet), usually the transmission bandwidth provided is very limited, can not meet the bandwidth requirement required for transmission of video.Wireless Internet application at present based on 3G, 4G is difficult to meet the demands too, moreover its mode by flow charging also brings larger burden to user.
Along with the raising of resolution, the frame per second that encoding device exports can decline (as the coding chip of same Costco Wholesale, the video for 130 everything elements can accomplish 30 frames, and can only accomplish 15 frames for the video of 500 everything elements) to some extent.
In addition, along with popularizing of intelligent terminal, mobile phone, PAD many times to become the video view screen of internet, applications camera, be limited to the disposal ability restriction of terminal equipment, these based on intelligent terminal be applied in process video time (as carried out distortions correction to figure), if the resolution of image is high, also pressure can be brought.
There is a kind of coding techniques based on ROI region at present, according to the area-of-interest that automatic or manual is arranged, regulated even algorithm amendment by parameter, only carry out elaborated code in region, and then reduce code flow, reduce the demand to bandwidth.Even if adopt ROI region coding, although can bandwidth demand be reduced, because the resolution realizing image does not change, also cannot improve frame per second and reduce hardware performance requirements.
Be subject to the restriction of video display terminal, high-definition picture is when equipment end shows, and often only display is wherein a part of, and the method for traditional encoding and decoding, transmission, the whole image of process is actual causes the wasting of resources.
Summary of the invention
In order to solve above-mentioned technical problem, the object of this invention is to provide a kind of web camera video transmission method, the method is based on the demand of the viewing video of user, under the prerequisite ensureing user's viewing quality as far as possible, utilize limited Internet resources, realize the transmission of video, when solving bandwidth deficiency, keep the video that high-quality, high fluency, high definition are provided to user.
In order to realize above-mentioned object, present invention employs following technical scheme:
A kind of web camera video transmission method, the method comprises the following steps:
1) by the Internet, network camera and client-side program connect;
2) client is according to the operation of current automatic or manual, generates control information, sends to network camera, described information comprise the image demand resolution of client, play area and picture quality arrange in one or more;
3) network camera is according to the instruction received, and processes the picture that transducer collects, to meet client playing demand;
4) network camera carries out video flowing coding to the image sequence after process;
5) broadcast information of video flow processing institute foundation is embedded in video flowing and sends to client together; Or by procotol, send to client with independent data mode;
6) client carries out decoding and showing according to the video flowing received and broadcast information;
7) when the broadcast information change of client, second step is repeated to the 6th step.
By above method, demand can be browsed, dynamic conditioning transferring content according to user, reduce the requirement to transmission bandwidth on the one hand, also reduce video decode and the computing pressure of receiving terminal simultaneously.
As preferably, in described step 3), network camera comprises the means that picture processes and cuts out one in picture and image scaling or 2 kinds.
As preferably, in described step 3), web camera carries out the collection of high definition complete image and locally to store.
As preferably, in described step 4), video flowing coding adopts H264 video flowing coding.
As preferably, in described step 5), broadcast information comprises the position of video in the overall situation, border and current video resolution, frame per second.
As preferably, described web camera is common camera or panoramic camera, and the angle of visual field of described panoramic camera is more than 120 °.
Above-mentioned technology needs by Internet Transmission, and client control command is mail to IPC, and IPC is transferred to client after changing local video coding again.Owing to there is the problem such as network communication delay, Video coding delay, user may be caused to feel that control response postpones, and experience sense is poor, and postpones due to the coding region of local code stream, when can cause user operation, current display area does not have image to show within time of delay.
In order to solve above-mentioned technical problem, further improvement of the present invention scheme is:
When client terminal playing complete image, according to the resolution dimensions of display device, rationally scaling is set, sends to network camera; Web camera generates the scaling video of complete image, is transferred to client, and similar subcode stream conventional at present, is called StreamOri; Step 4) is obtained video flowing coding and be called StreamLocal, while performing step 5), still carry out the coding of StreamOri, and StreamOri and StreamLocal video flowing is mixed; Step 6) client, according to after the mixed video stream received, is divided and is detected complete image scaling video and locally cut out scaling video, and relevant broadcast information; Obtain different image FrameOri and FrameLocal again according to broadcasting needs, be presented at zones of different: when full figure play by needs, display FrameOri, when video is corrected in needs display local, then show FrameLocal, when FrameLocal is inconsistent with the region needing to show, use FrameOri to fill temporarily.
As preferably, according to the code flow ratio of configuration information adjustment StreamLocal and StreamOri and or frame per second ratio, two-path video stream is mixed according to sequential.
As preferably, control according to resource restriction or other, StreamOri frame per second is turned down, then embed in StreamLocal video flowing, and distinguished by the partial information of specific protocol or video flowing standard agreement, decode respectively for different videos when client.
Current most of video playback apparatus true resolution is in 1080P(about 2,000,000 pixel) or 720P(about 100 pixel) left and right can provide good viewing effect, this resolution is substantially all less than the shooting resolution (usually can provide 5,000,000 or higher pixels) of high-resolution web camera, so when displaying video, or the local detail of display video and ignore other regions, or ignore details and play overall scenario.The present invention, owing to have employed above-mentioned technical scheme, when user needs to watch overall picture, according to display resolution information the reducing image of user's transmission, then can encode; And if user needs to watch local time, then the display region information sent according to user and display resolution information carry out cutting convergent-divergent to image, are partitioned into topography and encode.Realize the natural transition of two kinds of situations additionally by technical finesse, the final real-time requirement realized according to user, reduces bit stream data under the condition satisfied the demands, and reduces bandwidth or traffic demand.Method of the present invention is based on the demand of the viewing video of user, under the prerequisite ensureing user's viewing quality as far as possible, utilize limited Internet resources, realize the transmission of video, when solving bandwidth deficiency, keep the video that high-quality, high fluency, high definition are provided to user.
Accompanying drawing explanation
Fig. 1 is panoramic video treatment effect figure.
Fig. 2 is the display of picture entirety and the local enlargement display of web camera.
Embodiment
embodiment 1 web camera partial enlargement (as shown in Figure 2)
1) connect between network camera and client-side program.
2) client obtains the current window resolution (width that will play; height), the displaying video regional center that arranges manually or automatically of user is at original image (WIDTH; HEIGHT) pixel (cx in; cy), video display multiplication factor rate (rate>=1: play local in proportion; Rate=0: play full figure).And send to network camera.
3), after network camera receives parameter, cut out areas (left, top, right, bottom) is calculated, scaling (fx, fy).
During rate=0:
fx = width / WIDTH
fy = height / HEIGHT
left = 0
top = 0
right = WIDTH
bottom = HEIGHT
During rate unequal to 0:
Display amplification coefficient
rate = max(rate, width / WIDHT )
rate = max(rate, height / HEIGHT )
The region that displays the play can not exceed original image scope
cx = max(cx, width * 0.5 / rate )
cx = min( cx, WIDTH - width * 0.5 / rate )
cy = max(cy, height * 0.5 / rate )
cy = min( cy, HEIGHT - height * 0.5 / rate )
Zoning
left = cx - width * 0.5 / rate
top = cy - height * 0.5 / rate
right= cx + width * 0.5 / rate
bottom = cy + height * 0.5 / rate
Then the picture that transducer collects is processed.
According to region (left; top; right, bottom) former figure I is cut into Local map I1 (left<=x<right, top<=y<bottom); According to scaling (fx, fy), Local map I1 is narrowed down to result figure I2 again, finally obtain new image sequence.
4) network camera carries out H264 video flowing coding to result graphic sequence.
5) region (left, top, right, bottom) of video flow processing institute foundation and scaling (fx, fy) are embedded in the privately owned SEI information of video flowing H264, and by video stream to client.
6) client is according to the privately owned SEI information of resolving after the video flowing received wherein, and revises (cx, cy) and rate, then carries out decoding and showing.
7) when manually or automated manner have modified, when center or multiplication factor, client repeat second step to the 6th step.
embodiment 2 panoramic video is play
1) connect between panorama network camera and client-side program.
2) client carries out rectification playback process to panoramic video, carries out distortion correction, generate the picture of a similar common camera shooting, then play by a local class sector region in the circular picture of panorama.Meanwhile, client-side program calculates minimum enclosed rectangle (left, the top of the class sector region now launched, right, bottom), network camera is sent in the lump together with the window resolution (ShowWid, ShowHei) play and virtual PTZ parameter.
3) former figure I cutting is scaled to result figure I1 according to region (left, top, right, bottom) and obtains new image sequence by panorama network camera.
4) network camera carries out H264 video flowing coding to result graphic sequence.
5) region (left, top, right, bottom) of video flow processing institute foundation is embedded in the privately owned SEI information of video flowing H264 in the lump together with virtual PTZ parameter, and by video stream to client.
6) client is according to the privately owned SEI information of resolving after the video flowing received wherein, then carries out decoding and is put by image and carry out distortion correction and display in place.
7) when manually or automated manner change viewing area, client repeat second step to the 6th step.
panoramic video after embodiment 3 improvement is play
1) connect between panorama network camera and client-side program.
2) video initial play acquiescence is that full figure is play, and namely on screen, shows whole panoramic picture.Now display resolution (ShowWid, ShowHei), and image resolution ratio is (DefaultWid, DefaultHei).For high-resolution panoramic video: ShowWid< DefaultWid, ShowHei< DefaultHei.Client sends control protocol to IPC, request complete image scaling video stream, and result figure is of a size of (ShowWid, ShowHei), clipping region (left, top, right, bottom) is (0,0, DefaultWid, DefaultHei).
3) panorama network camera is according to control protocol, learns that this is full figure scaling video, after carrying out corresponding image procossing, completes video flowing coding, obtains the H264 video StreamOri of full figure convergent-divergent, and relevant information embedded in SEI data.
4) video flowing passes client back, and client is decoded, and obtains background image and shows.
5) when client carries out rectification playback process to panoramic video, carry out distortion correction by a local class sector region in the circular picture of panorama, generate the picture of a similar common camera shooting, then play.Meanwhile, client-side program calculates minimum enclosed rectangle (left, the top of the class sector region now launched, right, bottom), (ShowWid, ShowHei) is of a size of together with result figure and virtual PTZ parameter sends to network camera in the lump.
6) former figure I cutting is scaled to result figure I1 according to region (left, top, right, bottom) and (ShowWid, ShowHei) and obtains new image sequence by panorama network camera.
7) panorama network camera carries out H264 video flowing coding StreamLocal to result graphic sequence, is embedded in the lump in the privately owned SEI information of video flowing H264 in the region etc. of video flow processing institute foundation together with virtual PTZ parameter.
8) simultaneously panorama network camera still carries out the coding of StreamOri, just near for frame per second acceptable value (such as 5 seconds 1 frames, 10 seconds an I frame etc.).
9) according to generation sequential, mixing StreamOri and StreamLocal, is distinguished by proprietary protocol frame head, and by video stream to client.
10) client resolves privately owned frame head according to after the video flowing received, and divides and detects StreamOri and StreamLocal, be distributed to the processing module of response; Each processing module resolves privately owned SEI information wherein, then carries out decoding and generates corresponding image FrameOri and FrameLocal.
11) display module is according to current demand, shows:
If need to play full figure video, then show FrameOri;
If need display local to correct video, then show FrameLocal, when the situations such as delay cause FrameLocal and the region needing to show inconsistent, use FrameOri to fill temporarily.
12) when manually or automated manner change viewing area, client repeat second step to the 11 step.
Claims (9)
1. a web camera video transmission method, is characterized in that the method comprises the following steps:
1) by the Internet, network camera and client-side program connect;
2) client is according to the operation of current automatic or manual, generates control information, sends to network camera, described information comprise the image demand resolution of client, play area and picture quality arrange in one or more;
3) network camera is according to the instruction received, and processes the picture that transducer collects, to meet client playing demand;
4) network camera carries out video flowing coding to the image sequence after process;
5) broadcast information of video flow processing institute foundation is embedded in video flowing and sends to client together; Or by procotol, send to client with independent data mode;
6) client carries out decoding and showing according to the video flowing received and broadcast information;
7) when the broadcast information change of client, second step is repeated to the 6th step.
2. a kind of web camera video transmission method according to claim 1, is characterized in that network camera in described step 3) comprises the means that picture processes and cuts out one in picture and image scaling or 2 kinds.
3. a kind of web camera video transmission method according to claim 1, is characterized in that in described step 3), web camera carries out the collection of high definition complete image and local storage.
4. a kind of web camera video transmission method according to claim 1, is characterized in that in described step 4), video flowing coding adopts H264, H265 or MPEG4 video flowing coding.
5. a kind of web camera video transmission method according to claim 1, is characterized in that in described step 5), broadcast information comprises the position of video in the overall situation, border and current video resolution, frame per second.
6. a kind of web camera video transmission method according to claim 1 ~ 5 any one claim, is characterized in that described web camera is common camera or panoramic camera.
7. a kind of web camera video transmission method according to claim 1 ~ 5 any one claim, is characterized in that: when client terminal playing complete image, according to the resolution dimensions of display device, rationally arrange scaling, send to network camera; Web camera generates the scaling video of complete image, is transferred to client, is called StreamOri; Step 4) is obtained video flowing coding and be called StreamLocal, while performing step 5), still carry out the coding of StreamOri, and StreamOri and StreamLocal video flowing is mixed; Step 6) client, according to after the mixed video stream received, is divided and is detected complete image scaling video and locally cut out scaling video, and relevant broadcast information; Obtain different image FrameOri and FrameLocal again according to broadcasting needs, be presented at zones of different: when full figure play by needs, display FrameOri, when video is corrected in needs display local, then show FrameLocal, when FrameLocal is inconsistent with the region needing to show, use FrameOri to fill temporarily.
8. described a kind of web camera video transmission method according to claim 7, it is characterized in that: according to configuration information adjustment StreamLocal and StreamOri code flow ratio and or frame per second ratio, two-path video stream is mixed according to sequential.
9. described a kind of web camera video transmission method according to claim 8, it is characterized in that: control according to resource restriction or other, StreamOri frame per second is turned down, then embed in StreamLocal video flowing, and distinguished by the partial information of specific protocol or video flowing standard agreement, decode respectively for different videos when client.
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