CN101478661A - System and method for providing high quality subtitle adding in video stream - Google Patents
System and method for providing high quality subtitle adding in video stream Download PDFInfo
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Abstract
The invention provides a system for providing high-quality caption superposition in video flow and a method thereof. The system comprises an image and caption mixing module, an image zooming module, a control module, an image compression encoding module, a network transmission module, a decoder video head data analysis module, a video decoding display module and a back end caption information superposition module. The control module determines whether caption superposition is required before video data superposition. If the caption superposition is required, the caption is superposed at the front end or back end is determined according to the adopted resolution factor and code flow information. Then the caption superposition is executed purposefully from the front end or back end. The invention settles the problem that the display of caption which is superposed in the video image is unclear when the resolution factor is changed or under the lower code flow. The magnitude of caption does not change along with the change of video resolution factor or along with the change of code flow. The clear OSD caption is always displayed in the video decoding image.
Description
Technical field
The present invention relates to a kind of image or the video signal processing system and the method for field of video monitoring, specifically, relate in field of video monitoring contents such as captions, date, time are added in the video pictures, and can continue to show high-quality, a kind of system and method for the subtitle superposition content of high definition.
Background technology
At present in field of video monitoring, all need some information of time, date and scene are added in the video image.Monitor that for the monitor staff these information also need to preserve, so that consult later on.At Chinese patent: 200610029649.1, Chinese patent: 200610029650.4, Chinese patent: 200710194751.1, Chinese patent: 200610001243.2, Chinese patent: 01136295.2, all subtitle superposition is illustrated, but these all are how overlapping text on video image only has been described, and to the effect after the subtitle superposition, whether clear, not explanation.
First kind of way of carrying out subtitle superposition on video image adopts the special character chip superposed to design exactly, this way need increase an independent chip as shown in Figure 1 at the video coding front end, the analog video signal input, through becoming digital signal after the AD conversion, come overlapping text by character overlap chip again, video image behind the overlapping text is come original video reduction the video image after the stack of demonstration letter again again through after the video coding compression by Video Decoder.This way has not only increased cost, and flexibility is also very poor, and character library has no idea to change.Second kind of way as shown in Figure 2, the analog video signal input, through becoming digital signal after the AD conversion, convert yuv format to after the character that will superpose extracted from dot character, again the subtitle superposition of video image and conversion, video image behind the overlapping text is come original video reduction the video image after the stack of demonstration letter again again through after the video coding compression by Video Decoder.The third way as shown in Figure 3, analog video signal input through becoming digital signal after the AD conversion, is passed through video coding again, decoded video then at the rear end overlapping text, shows the video image after the subtitle superposition at last.
Major defect at first and second kind way:
1 first kind of way has not only increased cost, and flexibility is also very poor, and the font of character library has no idea to change;
2 these two kinds of ways are when the resolution of video changes, when becoming CIF from D1, or QCIF, or when CIF becomes QCIF, this is that image is actually and has done the convergent-divergent processing, and the captions that at this moment are superimposed upon on the video image also can diminish captions along with image convergent-divergent together.
3 these two kinds of ways can produce very big influence to the captions that superpose in video data after the code stream of video changes, owing to be subjected to the influence of encryption algorithm, captions can the same influence that is compressed ratio with image.When compression ratio is very big, the loss of image will be a lot, what image will become is not very clear, the captions that are superimposed upon on the image also can be subjected to same influence, particularly when the motion of big picture occurring when video, on video image, a large amount of squares will occur, the captions that are superimposed upon on the video are become be beyond recognition.Though in resolution is D1, code stream is 1M when above, or CIF can not exert an influence to the captions that superpose on the video under this code check when 265K is above.But when video image during in transmission over networks, the code check that influences that usually is subjected to the network bandwidth can be very not big, and above-mentioned like this problem will take place.
Though the third way always can show captions very clearly when video shows, but owing to be the letter that superposes in the video rear end, when the client need see the video file that this locality stores, the captions of video image have been superimposed upon even when the network bandwidth can satisfy the requirement of clear display captions, all just can't see.
Therefore, existing scheme all is difficult to find the satisfied high definition captions production method that satisfies double-current mode simultaneously.
Summary of the invention
Because what present transfer of data generally all adopted in the network difference is the mode of double fluid, what promptly record a video employing in this locality is the resolution of D1, what adopt when net passes is the resolution of CIF or QCIF, has guaranteed that so local storage and net biography can both have good effect.
Therefore, in order to solve existing because on the video image of video monitoring during overlapping text, when the change of resolution or code stream to the influence that the captions of stack produce, the invention provides a kind of captions adding system and method that is applicable to image or video content.This system not only solves the problem that influences that captions are subjected to video resolution and code stream, and has satisfied the requirement of Network Transmission and local storage.
The technical solution adopted for the present invention to solve the technical problems is: a kind of system that the high-quality subtitle superposition is provided in video flowing is provided, and it comprises image and captions mixing module, image zoom module, control module, image compression encoding module, network transmission module, network receiver module, analyze video heads data module and video decode display module, rear end overlapping text information module.Wherein control module is mainly selected the size of employed resolution and the size of employed Chinese character base according to video parameter; The image zoom module is mainly come zoomed image according to the set resolution of control module, and character library is selected and modular converter mainly extracts Chinese character to display from matrix Chinese character bank, and converts yuv format to; Image captions mixing module mainly is added to the Chinese character after the conversion in the image to display; The image compression encoding module mainly is responsible for image is compressed processing; Network transmission module mainly transmits decoder to image information and video heads information; Network receiver module (decoder) is given the transfer of data that receives and is analyzed the video heads data module, analyzing the video heads data module mainly separates video information exactly with video heads information, extract video heads information, and resolve video heads information, whether see needs overlapping text information according to information, in that zone stack, what the content of stack is and content information converted to YUV information; The video decode display module mainly reduces treatment conversion to the video information of compression and becomes yuv format, shows; Rear end overlapping text information module is to need the caption information of rear end stack to be input to the video decode display module.Its annexation is: the control module connection layout is selected and modular converter as Zoom module, character library, have image and captions mixing module between image zoom module, character library selection and the modular converter, image and captions mixing module are connected with image compression encoding module, network transmission module, analysis video heads data module and video decode display module in turn, are provided with rear end overlapping text information module between analysis video heads data module and video decode display module.
The described system that the high-quality subtitle superposition is provided in video flowing, it also has local memory module, the video data of local memory module in order to will play in this locality storage, it is connected with the image compression encoding module, if not play-overing, the image compression encoding module stores local memory module into after with video data compression.
The described system that the high-quality subtitle superposition is provided in video flowing, its image compression encoding module also is connected with the image head data module, the image head data module is added to the beginning of view data to the header of video, in order to judge whether needing decoder (network receiver module) to add captions.
A kind of method that the high-quality subtitle superposition is provided in video flowing, it comprises the steps:
1, at first need to judge whether overlapping text by control module;
2, if desired, just judge that according to resolution that is adopted and code stream information at the front end overlapping text still be at the rear end overlapping text;
If 3 at the front end overlapping text, the type according to the size or the user profile of resolution are selected character library becomes YUV422 or YUV420 formatted file to the character library information translation;
4, the image zoom module is carried out convergent-divergent with image, image and captions mixing module after image zoom picture signal and by character library select and the caption signal of modular converter transmission superimposed, obtain superposed signal;
5, the image compression encoding module is encoded the superposed signal that image captions mixing module sends,
6, the video data of coding back formation whether need to be selected local storage or is carried out simultaneously by Network Transmission or both;
7, video Data Transmission is given the decoder of far-end, decode;
8, behind the video data decoding, analyzing the video heads data module and come the decoded video header, whether in video heads need decoder at rear end overlapping text, just caption information is extracted from video heads if desired, otherwise do not extract if seeing;
9, show.
The described method that the high-quality subtitle superposition is provided in video flowing, before the overlapping text in the 2nd step, judge earlier the resolution of image and the size of code stream, and according to the code stream of employed resolution and video decide adopt great dot matrix word library and whether needs caption information is superimposed upon sends decoder in the video data head and show by decoder.
The described method that the high-quality subtitle superposition is provided in video flowing after superposed signal is encoded, again by the image head data module, is added to the header of video the beginning of coding back view data.Comprise the judgement signal that whether needs decoder to come overlapping text in the header, decoder module comes overlapping text if desired, so just also has caption information, otherwise is empty.
The invention solves at resolution changing or than low code stream following time, the captions that superpose in video image show problem dully.The size of captions can not changed along with the change of video resolution, also can not be subjected to the change of code stream and change, all the time the OSD captions of clear display in video decoding image.
Description of drawings
The present invention is further described below in conjunction with drawings and embodiments.
Fig. 1 is the structured flowchart of prior art mode one;
Fig. 2 is the structured flowchart of prior art mode two;
Fig. 3 is the structured flowchart of prior art mode three;
Fig. 4 is the block diagram of captions adding system of the present invention;
Fig. 5 is the flow chart of captions adding system of the present invention.
Embodiment
Technical scheme of the present invention comprises the steps:
Shown in the view 4, the present invention includes control module, image zoom module, character library selection and modular converter, image captions mixing module, image compression decoder module, image head data module, network transmission module, network receiver module, video heads data analysis module, rear end overlapping text information module, picture decoding module.Wherein control module is mainly selected the size of employed resolution and the size of employed Chinese character base according to video parameter; The image zoom module is mainly come zoomed image according to the set resolution of control module, original image is 720 x 576 (P standards), 720 x 480 (N standard), zoom ratio is 1:1 when resolution is D1, zoom ratio is 1:2 when resolution is 2CIF, when resolution for and during D1 zoom ratio be 1:2, zoom ratio is 1:4 when resolution is CIF, zoom ratio is 1:16 when resolution is QCIF; Character library is selected and modular converter mainly extracts Chinese character to display from matrix Chinese character bank, and converts yuv format to; Image captions mixing module mainly is added to the Chinese character after the conversion in the image to display; Image compression module mainly is responsible for image is compressed processing; The image head data module comprises the caption information that whether needs the judgement of rear end overlapping text information and needs to superpose mainly some information that whether need the rear end overlapping text; Network transmission module mainly is sent to decoder end to image information and video heads information, can transmit for modes such as TCP, UDP, RTP; The network receiver module is mainly used to receive the video data that sends from encoder-side; The image head data analysis module mainly separates video information exactly with video heads information, extract video heads information, and resolve video heads information, whether see needs overlapping text information according to information, in that zone stack, what the content of stack is and content information converted to YUV information; The picture decoding module is mainly reduced treatment conversion to the video information of compression and is become yuv format.
1 at first picture signal be YUV422 or YUV420 form, the resolution of coming the control chart picture by control module, just zooming parameter (as D1, HD1,2CIF, CIF, QCIF);
2 caption signals send character library to and select and modular converter, need to judge whether overlapping text by control module;
3 if desired, just judges that according to resolution that is adopted and code stream information at the front end overlapping text still be at the rear end overlapping text;
If 4 at the front end overlapping text, need use great character library according to the size of resolution, the type according to user profile selection character library becomes YUV422 or YUV420 formatted file to the character library information translation;
5 images and captions mixing module after image zoom picture signal and by character library select and the caption signal of modular converter transmission superimposed;
6 image compression encoding modules are encoded the picture signal that image captions mixing module sends, and whether need can select local storage or carry out simultaneously by Network Transmission or both;
7 image head data modules are added to video heads information the beginning of view data.Comprise the judgement signal that whether needs decoder module to come overlapping text in the header, decoder module comes overlapping text if desired, so just also has caption information, otherwise is empty;
8 network transmission modules are given the decoder of far-end video Data Transmission;
9 decoders come receiving video data by the network receiver module;
10 come the decoded video header by analyzing the video heads data module, and whether see needs decoder at the rear end overlapping text in the video heads, just caption information are extracted from video heads if desired, otherwise do not extract;
11 video decode display modules come decode video data, and show;
12 if desired by after bring in overlapping text just caption information on the superimposed image of rear end, and on display screen, show, just directly image is shown on display screen if bring in overlapping text after not needing.
Whether the video parameter information in shown in Figure 5 refers to: the resolution of video, code stream, frame per second, caption information and in information such as decoding end overlapping texts.The present invention decides the size of the character library that is adopted according to these information, and whether at decoding rear end overlapping text.What the present invention adopted now is to adopt 24 X 24 or 32 X, 32 character libraries when resolution is D1 and 2CIF, HD1 and CIF adopt the character library of 16 X 16, QCIF adopts the character library of 8 X 8, also can select (comprising regular script, the Song typeface, black matrix) arbitrarily to the font of character library.Whether select by the user at decoding rear end overlapping text, generally when the resolution of D1 during, CIF less than 512K in resolution during less than 128K, if will bring out existing mosaic square dress in decoding and displaying when having moving image to occur, make image very unclear, the captions of stack can't be seen clearly at all, and this is just need be at decoding rear end overlapping text.
In Network Transmission, picture quality is subjected to the influence of the network bandwidth.Particularly at network using ADSL or when wireless, the network bandwidth is littler, so when images, resolution that is adopted and code check are all smaller, image neither be very clear simultaneously.All adopt double-current mode at such application occasion, promptly adopt the resolution of D1 size, the resolution of employing CIF or QCIF size when net passes in this locality storage.Just more obvious in this application scenario advantage of the present invention, in the storage of this locality, at the front end overlapping text, when adopting Network Transmission, at the rear end overlapping text.
Can further to define the method for the invention by implementation process recited above and can make subtitle superposition information can not be subjected to the influence of vision signal, and all the time at the image of decoding end clear display.The present invention can satisfy the various demands of user to caption information, comprise and whether show captions, overlapping text in video data (make and also comprise caption information in the local canned data) is at decoding rear end overlapping text (make and do not comprise caption information in the local canned data).Can make the setting of captions so more flexible since the size of word and font arbitrarily principle make that the demonstration of captions is more clear.
Claims (6)
1, a kind of system that the high-quality subtitle superposition is provided in video flowing is characterized in that this system comprises that image and captions mixing module, image zoom module, control module, image compression encoding module, network transmission module, decoder analyze video heads data module and video decode display module, rear end overlapping text information module; Wherein control module is mainly selected the size of employed resolution and the size of employed Chinese character base according to video parameter; The image zoom module is mainly come zoomed image according to the set resolution of control module, and character library is selected and modular converter mainly extracts Chinese character to display from matrix Chinese character bank, and converts yuv format to; Image captions mixing module mainly is added to the Chinese character after the conversion in the image to display; The image compression encoding module mainly is responsible for image is compressed processing; Network transmission module mainly transmits decoder to image information and video heads information; Decoder is given the transfer of data that receives and is analyzed the video heads data module, analyzing the video heads data module mainly separates video information exactly with video heads information, extract video heads information, and resolve video heads information, whether see needs overlapping text information according to information, in that zone stack, what the content of stack is and content information converted to YUV information; The video decode display module mainly reduces treatment conversion to the video information of compression and becomes yuv format, shows; Rear end overlapping text information module is to need the caption information of rear end stack to be input to the video decode display module;
Annexation is: the control module connection layout is selected and modular converter as Zoom module, character library, have image and captions mixing module between image zoom module, character library selection and the modular converter, image and captions mixing module are connected with image compression encoding module, network transmission module, analysis video heads data module and video decode display module in turn, are provided with rear end overlapping text information module between analysis video heads data module and video decode display module.
2, the system that the high-quality subtitle superposition is provided in video flowing as claimed in claim 1, it is characterized in that this system also has local memory module, the video data of local memory module in order to will play in this locality storage, it is connected with the image compression encoding module, if not play-overing, the image compression encoding module stores local memory module into after with video data compression.
3, the system that the high-quality subtitle superposition is provided in video flowing as claimed in claim 1, it is characterized in that the image compression encoding module also is connected with the image head data module, the image head data module, the header of video is added to the beginning of view data, in order to judge whether needing decoder to add captions.
4, a kind of method that the high-quality subtitle superposition is provided in video flowing, it comprises the steps:
1), at first need to judge whether overlapping text by control module;
2), if desired, just judge that according to resolution that is adopted and code stream information at the front end overlapping text still be at the rear end overlapping text;
3) if at the front end overlapping text, the type according to the size or the user profile of resolution are selected character library becomes YUV422 or YUV420 formatted file to the character library information translation;
4), the image zoom module carries out convergent-divergent with image, image and captions mixing module after image zoom picture signal and by character library select and the caption signal of modular converter transmission superimposed, obtain superposed signal;
5), the image compression encoding module encodes the superposed signal that image captions mixing module sends,
6), the video data of coding back formation whether need to be selected local storage or is carried out simultaneously by Network Transmission or both;
7), give the decoder of far-end video Data Transmission, decode;
8), behind the video data decoding, analyze the video heads data module and come the decoded video header, whether in video heads need decoder at rear end overlapping text, just caption information is extracted from video heads if desired, otherwise do not extract if seeing;
9), show.
5, the method that the high-quality subtitle superposition is provided in video flowing as claimed in claim 4, it is characterized in that the 2nd) judge earlier the resolution of image and the size of code stream before the overlapping text in step, and according to the code stream of employed resolution and video decide the great dot matrix word library of employing and whether needs caption information is superimposed upon sends decoder in the video data head and show by decoder.
6, the method that the high-quality subtitle superposition is provided in video flowing as claimed in claim 4 after superposed signal is encoded, again by the image head data module, is added to the header of video the beginning of coding back view data.Comprise the judgement signal that whether needs decoder to come overlapping text in the header, decoder module comes overlapping text if desired, so just also has caption information, otherwise is empty.
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| CN101883263A (en) * | 2010-06-22 | 2010-11-10 | 中兴通讯股份有限公司 | Method and system for processing caption information in video monitoring system |
| CN102256161A (en) * | 2011-08-26 | 2011-11-23 | 杭州华三通信技术有限公司 | Transmission method and equipment for OSD (On Screen Display) information |
| CN103248951A (en) * | 2013-04-28 | 2013-08-14 | 天脉聚源(北京)传媒科技有限公司 | System and method for adding scrolling information into video |
| CN103369308A (en) * | 2013-07-10 | 2013-10-23 | 浙江宇视科技有限公司 | OSD superposition management and superposition execution method and device |
| CN105979182A (en) * | 2016-06-08 | 2016-09-28 | 中星电子股份有限公司 | OSD information coding method and OSD information coding device |
| CN106233717A (en) * | 2014-03-12 | 2016-12-14 | 罗伯特·博世有限公司 | For transmitting the system and method for parameter based on video camera in the case of without dedicated reverse channel |
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| CN101883263A (en) * | 2010-06-22 | 2010-11-10 | 中兴通讯股份有限公司 | Method and system for processing caption information in video monitoring system |
| CN102256161A (en) * | 2011-08-26 | 2011-11-23 | 杭州华三通信技术有限公司 | Transmission method and equipment for OSD (On Screen Display) information |
| CN102256161B (en) * | 2011-08-26 | 2014-03-19 | 杭州华三通信技术有限公司 | Transmission method and equipment for OSD (On Screen Display) information |
| CN103248951A (en) * | 2013-04-28 | 2013-08-14 | 天脉聚源(北京)传媒科技有限公司 | System and method for adding scrolling information into video |
| CN103248951B (en) * | 2013-04-28 | 2016-01-20 | 天脉聚源(北京)传媒科技有限公司 | A kind of system and method adding scroll information in video |
| CN103369308A (en) * | 2013-07-10 | 2013-10-23 | 浙江宇视科技有限公司 | OSD superposition management and superposition execution method and device |
| CN103369308B (en) * | 2013-07-10 | 2017-04-19 | 浙江宇视科技有限公司 | OSD superposition management and superposition execution method and device |
| CN106233717A (en) * | 2014-03-12 | 2016-12-14 | 罗伯特·博世有限公司 | For transmitting the system and method for parameter based on video camera in the case of without dedicated reverse channel |
| CN107005733A (en) * | 2014-12-19 | 2017-08-01 | 索尼公司 | Dispensing device, sending method, reception device and method of reseptance |
| CN107005733B (en) * | 2014-12-19 | 2020-06-16 | 索尼公司 | Transmission device, transmission method, reception device, and reception method |
| CN105979182B (en) * | 2016-06-08 | 2019-03-12 | 中星电子股份有限公司 | A kind of osd information coding method and code device |
| CN105979182A (en) * | 2016-06-08 | 2016-09-28 | 中星电子股份有限公司 | OSD information coding method and OSD information coding device |
| CN106303579A (en) * | 2016-09-20 | 2017-01-04 | 上海斐讯数据通信技术有限公司 | Video play device and method |
| CN107172351A (en) * | 2017-06-16 | 2017-09-15 | 福建星网智慧科技股份有限公司 | A kind of method of the real-time subtitle superposition of camera |
| CN107172351B (en) * | 2017-06-16 | 2020-04-03 | 福建星网智慧科技股份有限公司 | Method for rapidly superposing subtitles in real time by using camera |
| CN110445995A (en) * | 2019-07-04 | 2019-11-12 | 苏州光之翼智能科技有限公司 | A kind of UAV Video overlapping system |
| CN115988270A (en) * | 2022-12-28 | 2023-04-18 | 成都纵横大鹏无人机科技有限公司 | Method, device, storage medium and system for video OSD self-adapting image resolution |
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Application publication date: 20090708 |