CN104185090A - Video abstraction extraction and transmission method based on cooperative wireless communication - Google Patents
Video abstraction extraction and transmission method based on cooperative wireless communication Download PDFInfo
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- CN104185090A CN104185090A CN201410398981.XA CN201410398981A CN104185090A CN 104185090 A CN104185090 A CN 104185090A CN 201410398981 A CN201410398981 A CN 201410398981A CN 104185090 A CN104185090 A CN 104185090A
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Abstract
The invention discloses a video abstraction extraction and transmission method based on cooperative wireless communication. The video abstraction extraction method comprises the steps that original video streams are decoded to obtain an image sequence; the image sequence is divided into image frames of a type I, a type B and a type P; I-frame images are transformed into gray level images, and an I-frame gray level image sequence is formed by all the gray level images; a channel feedback factor and the total contrast scale value of the gray level image frames in the I-frame gray level image sequence are obtained, video abstraction image frames are extracted according to the channel feedback factor and the total contrast scale value, and the video attraction is formed by all the video extraction image frames. Video abstraction extraction is carried out the images according to the contrast scale value and the channel feedback factor, the image frames which can reflect video information to the largest degree and are representative can be extracted from a large number of video frames as few as possible to form the video extraction, and transmission speed and quality of cooperative wireless communication video can be improved.
Description
Technical field
The present invention relates to video data treatment technology, specifically, relate to extraction and the transmission of video frequency abstract, more particularly, the video frequency abstract relating to based on cooperation radio communication extracts and transmission method.
Background technology
Along with the development of broadband connections technology, video data has occupied the major part of network traffics, and what especially communicated by letter with 4G in safe city is universal, more makes anyone can produce, propagate, share, watch video data.But, because browsing of video data can take a lot of time, so video summarization technique is arisen at the historic moment.
Video frequency abstract claims again video concentrated, to video content simplified summary, in automatic or automanual mode, first by moving target, analyze, extract moving target, then the movement locus of each target is analyzed, different targets is spliced in a common background scene, and they are combined in some way.Video frequency abstract is being played the part of key player in video analysis and content-based video frequency searching.
Cooperation radio communication is the relatively technology in forward position of the current communications field, and it can mutually assist wireless transmitting unit and radio receiving unit when the object transmission information to desired.This method has been alleviated several problems that modern wireless communication systems faces, and need on wired base configuration of expansion, not spend a large amount of expenses.By use, cooperate, can also adopt the spatial distribution relevant with traditional multiple-input and multiple-output (MIMO) technology, and not need each node to there are many antennas.
At present, the method that realizes video frequency abstract extraction is more, and still, existing method realizes complicated, and extraction efficiency is low, is not suitable for being applied in the transmission of video in cooperation radio communication.At present, yet there are no the technology of video frequency abstract being extracted in conjunction with cooperation wireless communication system.
Summary of the invention
One of object of the present invention is to provide a kind of video frequency abstract extracting method based on cooperation radio communication, has more representativeness, is applicable to the video frequency abstract with the transmission of cooperation communication to extract.
For achieving the above object, the present invention adopts following technical proposals to be achieved:
A video frequency abstract extracting method based on cooperation radio communication, comprising:
Original video stream is decoded, obtain image sequence;
The picture frame that described image sequence is divided into I, B, P three types;
Described I two field picture is converted to gray level image, and all gray level images form I frame grayscale image sequence;
Obtain the transmission of video bit stream that transmits the signal transmitter unit of described video frequency abstract in cooperation radio communication
with the channel average bandwidth that transmits the channel of described video frequency abstract
, and calculate according to the following equation the channel feedback factor
:
;
Read in described I frame grayscale image sequence
frame gray level image
, calculate
spatial contrast degree measurement value
with time contrast measurement value
, and calculate and be somebody's turn to do according to the following equation
total contrast measurement value
:
;
Relatively
described total contrast measurement value
with total contrast metric threshold of setting
size, and the described channel feedback factor
with the channel feedback factor threshold value of setting
size;
If
and
, judge described gray level image
corresponding original image frame is video frequency abstract picture frame;
Wherein,
computing formula be:
,
computing formula be
,
?
frame gray level image
in
the gray value of point,
be
average gray value,
with
be
pixel coordinate variable,
with
be respectively
width and height;
with
for weights coefficient, meet
.
Preferably, described weights coefficient
span be [0,1], described weights coefficient
span be [0,1].
Preferably, described total contrast metric threshold
span be [0,100], described channel feedback factor threshold value
span be [0,100].
Video frequency abstract extracting method as above, described method also comprises:
Determine I frame, B frame and P frame in initial image frame, according to IBP frame compress mode, to described initial image frame compressed encoding, form described original video stream.
Two of object of the present invention is to provide a kind of video frequency abstract transmission method based on cooperation radio communication, to improve the transmission quality of video image in cooperation radio communication.
For achieving the above object, the present invention adopts following technical proposals to be achieved:
A video frequency abstract transmission method based on cooperation radio communication, comprising:
The signal transmitter unit of cooperation in radio communication sends original video by least one channel and makes a summary to TU Trunk Unit, and by least one channel, sends described original video and make a summary to signal receiving unit;
Described TU Trunk Unit is amplified the described original video summary receiving, and forms intermediate video summary, then described intermediate video summary is forwarded to described signal receiving unit by channel;
The transmission quality of the described original video summary that described signal receiving unit relatively receives and the transmission quality of described intermediate video summary, retain the highest video frequency abstract of transmission quality, abandons remaining video frequency abstract;
Wherein, described original video summary is extracted and is obtained by said method.
Preferably, the Y-PSNR that described transmission quality is video frequency abstract.
Compared with prior art, advantage of the present invention and good effect are:
1, the present invention processes by enrich the I two field picture of video information to comprising in original video stream, obtain spatial contrast degree measurement value and the time contrast measurement value of reflection image frame information, according to contrast measurement value, image is carried out to video frequency abstract extraction, can from a large amount of frame of video, extract try one's best few, at utmost reflecting video information, representative picture frame formation video frequency abstract; , in conjunction with the channel of cooperation radio communication, video frequency abstract do to extract is limited meanwhile, thereby obtained the video frequency abstract of the communication transmission that is suitable for cooperating, contribute to improve transmission speed and the quality of cooperation radio communication video.
2, the present invention is in cooperation radio communication, by different channels, respectively the intermediate video summary after original video summary and amplification processing is transferred to signal receiving unit, make signal receiving unit can from multipath reception signal, select high-quality transmission of video, and then improve the receiver, video quality in cooperation radio communication.
Read by reference to the accompanying drawings after the specific embodiment of the present invention, it is clearer that the other features and advantages of the invention will become.
Accompanying drawing explanation
Fig. 1 is the flow chart that the present invention is based on an embodiment of video frequency abstract extracting method of cooperation radio communication;
Fig. 2 is the flow chart that the present invention is based on an embodiment of video frequency abstract transmission method of cooperation radio communication.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below with reference to drawings and Examples, the present invention is described in further detail.
Refer to Fig. 1, this figure is depicted as the flow chart of an embodiment of video frequency abstract extracting method who the present invention is based on cooperation radio communication.
As Fig. 1, it is specific as follows that this embodiment extracts the process of video frequency abstract:
Step 101: original video stream is decoded, obtain image sequence.
Here said original video stream, can be video flowing that take in real time, after compressed encoding, can be also historical video flowing that stored, after compressed encoding.First, need to decode to original video stream, resolve into image one by one, form image sequence.Concrete decode procedure can adopt in prior art, at this, is not elaborated.
Step 102: the picture frame that image sequence is divided into I, B, P three types.
Original video stream in step 101 is the video flowing after compressed encoding.When compressed encoding, pre-determine I frame, B frame and P frame in initial image frame.Then, according to IBP frame compress mode, to initial image frame compressed encoding, form original video stream.Step 101 when decoding, according to the decoding process corresponding with coding to the original video stream processing of decoding.Then, in this step 102, decoded image sequence is divided into the picture frame of I, B, P three types.
Step 103: I two field picture is converted to gray level image, forms I frame grayscale image sequence.
In decoded image sequence, I two field picture has abundant information, content that can reflecting video image.Thereby, in this embodiment, choose I two field picture as the foundation drawing picture frame that obtains video frequency abstract, abandon B two field picture and P two field picture.
For I two field picture, first every two field picture is converted to gray level image; Then, all I frame gray level images form I frame grayscale image sequence.Greyscale image transitions method can adopt prior art to realize.
Step 104: the total contrast measurement value that obtains grey-level image frame in the channel feedback factor and I frame grayscale image sequence.
Wherein, whether the channel condition that the size of the channel feedback factor characterizes cooperation wireless communication system is applicable to transmission of video summary, and it can obtain by following method:
Obtain the transmission of video bit stream of the signal transmitter unit of transmission of video summary in cooperation radio communication
.For a signal transmitter unit, its transmission of video bit stream is fixed, and can must obtain according to the index parameter of signal transmitter unit is easy.Meanwhile, obtain the channel average bandwidth of the channel of transmission of video summary
.Signal transmitter unit may pass through one or more transmission video frequency abstracts.If signal transmitter unit is only by a transmission video frequency abstract, the bandwidth of this channel is
.If signal transmitter unit is by a plurality of transmission video frequency abstracts,
refer to the mean value of a plurality of channel widths.The band data of channel can be obtained by the parameter of channel physical layer.Then, calculate according to the following equation the channel feedback factor
:
In I frame grayscale image sequence, the size of total contrast measurement value of grey-level image frame has characterized the importance of picture frame in whole video flowing, also characterizes the number that it comprises important video information, and it can obtain by following manner:
Read in I frame grayscale image sequence
frame gray level image
, calculate according to the following equation this frame gray level image
spatial contrast degree measurement value
:
For this frame gray level image
, calculate according to the following equation its time contrast measurement value
:
Then, to spatial contrast degree measurement value
with time contrast measurement value
be weighted summation, obtain this frame gray level image
total contrast measurement value
:
In above-mentioned several formula,
?
frame gray level image
in
the gray value of point,
be
average gray value,
with
be
pixel coordinate variable,
with
be respectively
width and height;
with
for weights coefficient, the impact on total contrast measurement value for balance space contrast measurement value and time contrast measurement value, meets
.Preferably, weights coefficient
span be [0,1], weights coefficient
span be [0,1].
Step 105: judge whether that the channel feedback factor is not less than setting threshold and total contrast measurement value is also not less than setting threshold.If so, perform step 107; Otherwise, execution step 106.
In this embodiment, preset channel feedback factor threshold value
with total contrast metric threshold
.The size of these two threshold values and the factor analysis such as the signal transmitter unit in wireless communication system of cooperating, transmission channel.Preferably, total contrast metric threshold
span be [0,100], channel feedback factor threshold value
span be [0,100].Through above-mentioned steps, obtain the channel feedback factor
with total contrast measurement value
afterwards, make comparisons and judge size with corresponding setting threshold respectively.Specifically, the channel feedback factor that comparison step 104 is obtained
with channel feedback factor threshold value
size, the judgement channel feedback factor
whether be not less than channel feedback factor threshold value
, that is to say no
; Total contrast measurement value that comparison step 104 is obtained
with total contrast metric threshold
size, and judge total contrast measurement value
whether be not less than total contrast metric threshold
, that is to say no
.Then, according to judged result, carry out different processing procedures.
Step 106: if step 105 result of determination is no, also, the channel feedback factor
be less than channel feedback factor threshold value
and/or total contrast measurement value
be less than total contrast metric threshold
, abandon and there is this total contrast measurement value
?
the corresponding original image frame of frame grey-level image frame.
Step 107: if step 105 result of determination is yes, also, the channel feedback factor
be not less than channel feedback factor threshold value
, and total contrast measurement value
also be not less than total contrast metric threshold
, extract and there is this total contrast measurement value
?
original image frame corresponding to frame grey-level image frame is video frequency abstract picture frame.All grey-level image frame in I frame grayscale image sequence are calculated respectively to total contrast measurement value, and adopt successively the deterministic process of step 105 to judge, extract all video frequency abstract picture frames, all video frequency abstract picture frames form video frequency abstract.
This embodiment enriches the I two field picture of video information to be processed comprising in original video stream, obtain reflection in picture frame comprise video information spatial contrast degree measurement value and time contrast measurement value, generate total contrast measurement value of phenogram picture frame importance in whole video flowing, according to contrast measurement value, image is carried out to video frequency abstract extraction, can from a large amount of frame of video, extract try one's best few, at utmost reflecting video information, representative picture frame formation video frequency abstract.Meanwhile, in conjunction with the cooperation channel of radio communication and signal transmitter unit, video frequency abstract is done to extract and limit, thereby obtained the video frequency abstract of the communication transmission that is suitable for cooperating.
Refer to Fig. 2, the figure shows the flow chart of an embodiment of video frequency abstract transmission method who the present invention is based on cooperation radio communication.
As shown in Figure 2, the method for this embodiment based on cooperation wireless communication transmissions video frequency abstract is as follows:
Step 201: signal transmitter unit sends original video by least one channel and makes a summary to TU Trunk Unit, and make a summary to signal receiving unit by least one channel transmission original video.
Signal transmitter unit, as the information source in cooperation wireless communication system, sends original video with broadcast mode by channel and makes a summary.Wherein, the recipient of original video summary is two, the TU Trunk Unit for cooperating in radio communication, and as via node, another,, for the signal receiving unit in cooperation radio communication, is also the stay of two nights.Wherein, signal transmitter unit is sent to TU Trunk Unit by least one channel by original video summary, by being different from least one channel of TU Trunk Unit channel, original video summary is sent to signal receiving unit.
Wherein, the video frequency abstract of original video summary for adopting the method for Fig. 1 embodiment to extract.
Step 202: TU Trunk Unit is done to amplify to the original video summary receiving and processed, and forms intermediate video summary, and is forwarded to signal receiving unit.
TU Trunk Unit receives original video summary, in physical layer, signal is amplified, and forms intermediate video summary, to improve the power transmitting.Then, intermediate video summary is forwarded to signal receiving unit by channel.
Step 203: the original video summary that signal receiving unit relatively receives and intermediate video summary, retain the highest video frequency abstract of transmission quality, abandon remaining video frequency abstract.
Signal receiving unit obtains respectively received original video summary and the transmission quality of intermediate video summary, selects the highest final video frequency abstract of conduct of transmission quality, and all the other video frequency abstracts abandon.
Specifically, the Y-PSNR PSNR that signal receiving unit obtains Y-PSNR PSNR received, that make a summary from the original video of signal transmitter unit and receives, make a summary from the intermediate video of TU Trunk Unit, select signal that Y-PSNR PSNR is the highest as the video frequency abstract of final needs, utilize this video frequency abstract to carry out video signal reconstructed, abandon all the other video frequency abstracts.
Further, in this embodiment, TU Trunk Unit is not limited to one-level, can be multistage relaying, carries out multistage amplification processing.
In the cooperation radio communication video frequency abstract transmission method of this embodiment, by the different video frequency abstract signals that transmission content is identical, signal quality is different to signal receiving unit, make signal receiving unit receive multiple signals, also can from multipath reception signal, select high-quality transmission of video, and then improved the receiver, video quality in cooperation radio communication.And, based on cooperation wireless communication system transmission of video, the transmission of video in application layer is combined with the wireless communication system transmission that cooperates of physical layer, realized the very big raising of video frequency abstract signal transmission quality.
Above embodiment is only in order to technical scheme of the present invention to be described, but not is limited; Although the present invention is had been described in detail with reference to previous embodiment, for the person of ordinary skill of the art, the technical scheme that still can record previous embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of the present invention's technical scheme required for protection.
Claims (6)
1. the video frequency abstract extracting method based on cooperation radio communication, is characterized in that, described method comprises:
Original video stream is decoded, obtain image sequence;
The picture frame that described image sequence is divided into I, B, P three types;
Described I two field picture is converted to gray level image, and all gray level images form I frame grayscale image sequence;
Obtain the transmission of video bit stream that transmits the signal transmitter unit of described video frequency abstract in cooperation radio communication
with the channel average bandwidth that transmits the channel of described video frequency abstract
, and calculate according to the following equation the channel feedback factor
:
;
Read in described I frame grayscale image sequence
frame gray level image
, calculate
spatial contrast degree measurement value
with time contrast measurement value
, and calculate and be somebody's turn to do according to the following equation
total contrast measurement value
:
;
Relatively
described total contrast measurement value
with total contrast metric threshold of setting
size, and the described channel feedback factor
with the channel feedback factor threshold value of setting
size;
If
and
, judge described gray level image
corresponding original image frame is video frequency abstract picture frame;
Wherein,
computing formula be:
,
computing formula be
,
?
frame gray level image
in
the gray value of point,
be
average gray value,
with
be
pixel coordinate variable,
with
be respectively
width and height;
with
for weights coefficient, meet
.
2. video frequency abstract extracting method according to claim 1, is characterized in that, described weights coefficient
span be [0,1], described weights coefficient
span be [0,1].
3. video frequency abstract extracting method according to claim 1, is characterized in that, described total contrast metric threshold
span be [0,100], described channel feedback factor threshold value
span be [0,100].
4. according to the video frequency abstract extracting method described in any one in claims 1 to 3, it is characterized in that, described method also comprises:
Determine I frame, B frame and P frame in initial image frame, according to IBP frame compress mode, to described initial image frame compressed encoding, form described original video stream.
5. the video frequency abstract transmission method based on cooperation radio communication, is characterized in that, described method comprises:
The signal transmitter unit of cooperation in radio communication sends original video by least one channel and makes a summary to TU Trunk Unit, and by least one channel, sends described original video and make a summary to signal receiving unit;
Described TU Trunk Unit is amplified the described original video summary receiving, and forms intermediate video summary, then described intermediate video summary is forwarded to described signal receiving unit by channel;
The transmission quality of the described original video summary that described signal receiving unit relatively receives and the transmission quality of described intermediate video summary, retain the highest video frequency abstract of transmission quality, abandons remaining video frequency abstract;
Wherein, described original video summary is extracted and is obtained by the method described in any one in the claims 1 to 4.
6. video frequency abstract transmission method according to claim 5, is characterized in that, the Y-PSNR that described transmission quality is video frequency abstract.
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| CN113141202A (en) * | 2021-04-25 | 2021-07-20 | 上海大学 | MIMO space non-stationary channel estimation method based on image contour extraction |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106034264A (en) * | 2015-03-11 | 2016-10-19 | 中国科学院西安光学精密机械研究所 | Coordination-model-based method for obtaining video abstract |
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Application publication date: 20141203 |