CN100551065C - A kind of verifying video content system and method - Google Patents
A kind of verifying video content system and method Download PDFInfo
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- CN100551065C CN100551065C CN 200610167182 CN200610167182A CN100551065C CN 100551065 C CN100551065 C CN 100551065C CN 200610167182 CN200610167182 CN 200610167182 CN 200610167182 A CN200610167182 A CN 200610167182A CN 100551065 C CN100551065 C CN 100551065C
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Abstract
The invention discloses a kind of verifying video content system, this system comprises key-frame extraction unit and picture browsing terminal, wherein: the key-frame extraction unit, be used for extracting adjacent interior frame from pending video data stream, and when described adjacent in the histogram difference of frame during greater than predetermined threshold value, between described adjacent interior frame, extract frame of video, again frame of video and the described adjacent interior frame that extracts sent to the picture browsing terminal; The picture browsing terminal, be used to show the frame of video extracted and adjacent in frame for manually browsing examining content.The invention also discloses a kind of verifying video content method.Use after the present invention, need not displaying video and just can examine video content fast, reduced working strength, greatly saved cost.And, when carrying out the remote content audit, need not transmit the whole video content, only need the hop picture, so the present invention has also greatly saved the Network Transmission bandwidth.
Description
Technical field
The present invention relates to the Internet (Internet) technical field, more specifically, the present invention relates to a kind of verifying video content system and method.
Background technology
Along with the development of the Internet broadband technology, the video resource on the network is more and more abundanter.Be that the video sharing website of main information carrier has also obtained swift and violent development with video in recent years, on the video sharing website of main flow, the video clicking rate of every day can reach more than one hundred million times, and the amount of uploading of video can reach up to ten thousand sections.Because the tremendous influence scope that video is shared is just essential to the audit of its content.But to huge number of videos like this, if examine by manually watching one by one, efficient is very low undoubtedly.Therefore pressing for a kind of verifying video content efficiently system helps the provider of video content or provides video to share professional website carry out content auditing.
Video resource on the network all provides with compress mode, and the video encoding standard (as MPEG4, H264 etc.) that obtains developing rapidly in recent years makes high-speed transfer and the storage of video information on network become possibility.In video coding technique, coded image generally is divided into three types: interior frame (I), inter-frame (P) and bidirectional frame (B).Interior frame has utilized spatial coherence, adopts with the similar mode of JPEG static image is encoded.Inter-frame has utilized temporal correlation, uses the frame of front to predict as the reference frame.Bidirectional frame then utilizes the frame of front and the frame of back to predict as the reference frame simultaneously.To produce residual error data after the prediction, residual error data is carried out dct transform and quantification, the output encoder code stream is promptly finished video compression.
The interior frame key frame that is otherwise known as, key frame can not needed the information with reference to other frames by independent decoding.Therefore in video flowing, key frame can be extracted separately, and in the process of video coding, the frame of video that generally can select scene change will take place is encoded to key frame, so the key frame in the video flowing can reflect the content overview of whole section video best.
Though for most of video file, the type of coded image all is above-mentioned three kinds, but because encryption algorithm is varied, so the form of video file varies, and therefore the video unification that all user can be uploaded of most video sharing website converts the FLV form to.FLV is a kind of brand-new streaming media video form, and it has utilized widely used Flash Player platform on the webpage, and video is incorporated in the Flash animation, is very suitable for sharing on the network video.Therefore, summary is got up, video is shared several steps such as needs process user uploads, format conversion, content auditing, can provide on the video sharing platform at last, and wherein content auditing is the expensive and requisite link of a cost for large-scale video sharing website.
Present verifying video content major part lacks special verifying video content system manually to watch one by one.Because video is with certain frame per second played in order, watches video speed slow, human cost will be very high when number of videos is huge.
Summary of the invention
In view of this, main purpose of the present invention is a kind of verifying video content of proposition system, to save cost.
Another object of the present invention is to propose a kind of verifying video content method, to save cost.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of verifying video content system, this system comprises key-frame extraction unit and picture browsing terminal and picture synthesis unit, wherein:
The key-frame extraction unit, be used for extracting adjacent interior frame from pending video data stream, and when described adjacent in the histogram difference of frame during greater than predetermined threshold value, extract frame of video between the frame from described in adjacent, again with the frame of video extracted and described adjacent in frame send to the picture synthesis unit;
The picture synthesis unit is used for described frame of video and adjacent interior frame are synthesized picture, and the picture that is synthesized is sent to the picture browsing terminal; The picture browsing terminal is used to show that the picture that is synthesized is for manually browsing examining content.
Described picture synthesis unit, be used for the frame of video of predetermined quantity and adjacent in frame be spliced into picture with the mode convergent-divergent of N * N, and the spliced picture of described convergent-divergent is sent to the picture browsing terminal;
Described picture browsing terminal is used to show that the spliced picture of described convergent-divergent is for manually browsing examining content.
Described picture synthesis unit is used for all converting all frame of video and adjacent interior frame to thumbnail, and described convergent-divergent figure is sent to the picture browsing terminal;
Described picture browsing terminal is used to show that described thumbnail is for manually browsing examining content.
The key-frame extraction unit from extracting frame of video between the adjacent interior frame is:
This key-frame extraction unit extracts frame of video according to predetermined interval between described adjacent interior frame.
This system also comprises image sets GOP buffer and key frame buffer, wherein
The GOP buffer, be used to store two of pending video data stream adjacent in frame of video between the frames;
The key-frame extraction unit, be used for extracting described two adjacent interior frames from the GOP buffer, and when described adjacent in the histogram difference of frame during greater than predetermined threshold value, again from described GOP buffer extract described adjacent in frame of video between the frame, again with the frame of video extracted and described adjacent in frame send to the key frame buffer;
The key frame buffer is used to store the frame of video and the interior frame that are provided by the key-frame extraction unit, and provides buffer content to the picture browsing terminal.
A kind of verifying video content method, this method comprises:
A, from pending video data stream, extract adjacent in frame, and when described adjacent in the histogram difference of frame during greater than predetermined threshold value, between described adjacent interior frame, extract frame of video;
B, with described frame of video and adjacent in frame synthesize picture, and show that the picture synthesized is for manually browsing examining content.
Described frame of video and adjacent interior frame synthesize picture and comprise:
With the frame of video of predetermined quantity and adjacent in frame be spliced into picture with the mode convergent-divergent of N * N, perhaps with all frame of video and adjacent in frame convert thumbnail to.
In the steps A be from extracting frame of video between the adjacent interior frame:
Between described adjacent interior frame, extract frame of video according to predetermined interval.
From technique scheme as can be seen, in the verifying video content system that the present invention proposes, whether the histogram difference of frame was greater than predetermined threshold value in the key-frame extraction unit judges was adjacent, if greater than would extract frame of video between the frame in adjacent, again with the frame of video extracted and adjacent in frame send to the picture browsing terminal and show, for manually browsing examining content.This shows, use after the present invention, by the dynamic video circulation being changed into the verifying video content picture of several static state, and these verifying video content pictures can be summarized the content of whole section video, therefore need not displaying video just can examine video content, thereby reduced working strength, greatly saved cost.
And, when carrying out the remote content audit, need not transmit the whole video content, only need transmitted video content audit picture, so the present invention has also greatly saved the Network Transmission bandwidth.
Description of drawings
Fig. 1 is the demonstrative structure schematic diagram according to verifying video content of the present invention system;
Fig. 2 is the structural representation according to the verifying video content system of the embodiment of the invention;
Fig. 3 is the picture transmission schematic diagram according to the embodiment of the invention;
Fig. 4 is the schematic flow sheet according to verifying video content method of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention express clearlyer, the present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Fig. 1 is the demonstrative structure schematic diagram according to verifying video content of the present invention system.As shown in Figure 1, this verifying video content system 100 comprises key-frame extraction unit 101 and picture browsing terminal 102, wherein:
Key-frame extraction unit 101, be used for extracting adjacent interior frame from pending video data stream, and when described adjacent in the histogram difference of frame during greater than predetermined threshold value, between described adjacent interior frame, extract frame of video, again frame of video and the described adjacent interior frame that extracts sent to picture browsing terminal 102;
Can use the present invention the video data in various sources is carried out content auditing.Such as: when the video that video data is uploaded for the user, the video that needs at first earlier the user to be uploaded is decoded, to obtain original video data after the decoding, then original video data is carried out secondary coding, to convert unified FLV form to, after format conversion is finished, the content of video is examined by verifying video content of the present invention system, if content legality then allow to issue video and share is as the issue of non-rule refusal.
Key-frame extraction unit 101 is mainly used in and extracts the some frame of video that can react the video content overview from video flowing.A video flowing is made up of many encoded video frames, and the frame of video between two adjacent interior frames (I) is defined as an image sets (GOP).The key frame that from video flowing, extracts must can reflecting video the content overview, the extraction of key frame will be finished synchronously with decode procedure.In the process of decoded video streams, interior frame (I frame) will be as candidate's key frame, compare with a last interior frame, if the significant change of scene has taken place between two adjacent interior frames, then can extract frame of video (wherein from pressing between two interior frames as key frame, preferably extract frame of video as key frame) by certain interval, candidate's interior frame also will be as key frame, if there is not the significant change of occurrence scene between two adjacent interior frames, then at following two adjacent in frames proceed next round relatively.
Wherein, can judge whether to take place the significant change of scene by the histogram difference of frame in adjacent.At first preestablish the histogram difference threshold value, when two adjacent in the histogram difference of frame during greater than the histogram difference threshold value, then assert the significant change that scene has taken place, extract frame of video as key frame according to preestablishing at interval this moment, and adjacent interior frame also will be as key frame.
Preferably, this system further comprises the picture synthesis unit,
Described picture synthesis unit, the described frame of video and the adjacent interior frame that are used for key-frame extraction unit 101 is extracted synthesize picture, and the picture that is synthesized is sent to the picture browsing terminal, at this moment
Described picture browsing terminal 102 is used to show that the picture that is synthesized is for manually browsing examining content.
Wherein, as an example of the present invention, the picture synthesis unit, can be used for the frame of video of predetermined quantity and adjacent in frame (for example 16) be spliced into a pictures with the mode convergent-divergent of N * N, and the spliced picture of described convergent-divergent is sent to picture browsing terminal 102.
As another example of the present invention, the picture synthesis unit also can convert these pictures to the form of thumbnail correspondingly.The content auditing picture that converts to will comprise and original video section information corresponding.As another example of the present invention, can also in filename, comprise corresponding relation with the original video section.
The picture synthesis unit need be passed to picture picture browsing terminal 102 and handle after converting.Wherein, picture browsing terminal 102 can be arranged in same appliance arrangement with described picture synthesis unit, key-frame extraction unit 101, also can be connected by networks such as the Internets.When connecting by network, Network Transmission is for the benefit of preferably at first compressed saving bandwidth picture, and then the picture that will compress is passed to picture browsing terminal 102 again and handled.
According to above-mentioned analysis, the present invention can have numerous embodiments.Such as, can in system architecture, increase GOP buffer and key frame buffer.
Fig. 2 is the structural representation according to the verifying video content system of the embodiment of the invention.As shown in Figure 2, this system 200 comprises GOP buffer 201, key-frame extraction unit 202, key frame buffer 203 and picture browsing terminal 204, wherein: GOP buffer 201, be used to store two of pending video data stream adjacent in frame of video between the frames;
Key-frame extraction unit 202, be used for extracting described two adjacent interior frames from GOP buffer 201, and when described adjacent in the histogram difference of frame during greater than predetermined threshold value, from the frame of video between the described adjacent interior frame of described GOP buffer 201 extractions, again frame of video and the described adjacent interior frame that extracts sent to key frame buffer 203 again;
Similarly, this system 200 can further include the picture synthesis unit, the picture synthesis unit between key frame buffer 203 and picture browsing terminal 204,
Described picture synthesis unit is used for the frame of video and the adjacent interior frame of key frame buffer 203 are synthesized picture, and the picture that is synthesized is sent to picture browsing terminal 204, at this moment
Described picture browsing terminal 204 is used to show that the picture that is synthesized is for manually browsing examining content.
Wherein, as an example of the present invention, the picture synthesis unit, can be used for the frame of video of predetermined quantity and adjacent in frame (for example 16) be spliced into a pictures with the mode convergent-divergent of N * N, and the spliced picture of described convergent-divergent is sent to picture browsing terminal 204.
As another example of the present invention, the picture synthesis unit can also convert these pictures to the form of thumbnail correspondingly.The content auditing picture that converts to will comprise and original video section information corresponding.As another example of the present invention, can also in filename, comprise corresponding relation with the original video section.
In a word, the picture synthesis unit is passed to picture browsing terminal 204 with picture and is handled after converting.Wherein, picture browsing terminal 204 can be arranged in same appliance arrangement with described picture synthesis unit, key-frame extraction unit 202, also can be connected by networks such as the Internets.When connecting by network, for the benefit of Network Transmission preferably will be compressed picture, and the picture that has compressed is passed to picture browsing terminal 204 again and handled.
When need utilize the network connection that picture is transferred to picture browsing terminal 204, picture browsing terminal 204 can be in one or several positions of concentrating relatively, can utilize the content delivery service device that is specifically designed to transfer function that pending picture is transferred to the picture browsing terminal this moment, so that manually focus on.
Fig. 3 is the picture transmission schematic diagram according to the embodiment of the invention, wherein places in the picture browsing termination set, receives the picture that is come by the transmission of content delivery service device by each video auditing system.
The function of picture browsing terminal 204 is received content audit pictures and shows, as an example of the present invention, the mode that shows can be that the content auditing picture is play in the mode of lantern slide, thereby the content auditing personnel can browse these lantern slides apace, after one group of content auditing picture playing of a video-frequency band correspondence was intact, the content auditing personnel can also import auditing result.
Auditing result will be sent to video is shared database or other deposit the position of original video by system, thereby determine whether this video can be issued.
The invention allows for a kind of verifying video content method.Fig. 4 is the schematic flow sheet according to verifying video content method of the present invention.As shown in Figure 4, this method comprises:
Step 401: from pending video data stream, extract adjacent in frame, and when described adjacent in the histogram difference of frame during greater than predetermined threshold value, between described adjacent interior frame, extract frame of video;
Preferably between described adjacent interior frame, extract frame of video here, according to predetermined interval.
Step 402: frame of video that demonstration is extracted and adjacent interior frame are for manually browsing examining content.
Wherein, step 402 can comprise:
Described frame of video and adjacent interior frame are synthesized picture, and show that the picture that is synthesized is for manually browsing examining content.And, be specifically as follows: with the frame of video of predetermined quantity and adjacent in frame be spliced into picture with the mode convergent-divergent of N * N, perhaps with all frame of video and adjacent in frame convert thumbnail to.
Corresponding to flow process shown in Figure 4 and system shown in Figure 2 structure, concrete enforcement of the present invention can comprise:
The first step: beginningization GOP frame buffer is storing all the decoded frame of video among the GOP, and initialization picture audit buffer is used for the frame of video of content auditing with storage.
Second step: from video flowing, read a frame of video of having encoded, judge whether it is first interior frame of a GOP; If, then with its decoding and join in the picture audit buffer, continued for the 3rd step, if not, then read next frame of video of having encoded, repeated for second step.
The 3rd the step, judge whether video file finishes, if, then Overall Steps finishes, otherwise read next frame of video of having encoded and decoding, judge whether it is second interior frame of this GOP, if, then continued for the 4th step, if not, then decoded frame of video is deposited in the GOP frame buffer, repeated for the 3rd step.
The 4th goes on foot, examines from picture and read previous interior frame the buffer, calculates the histogram H of first interior frame and second interior frame
PrevAnd H
Curr, calculate their difference then:
If Diff greater than threshold value T (as an example of the present invention, threshold value T can be 0.4 * picture altitude * picture traverse), then from the GOP buffer, press certain interval (as an example of the present invention, this interval can for GOP length 1/5) read out frame of video, and be deposited in the picture audit buffer, continued for the 5th step, if Diff less than threshold value T, then directly entered for the 5th step;
The 5th the step, empty the GOP buffer, repeated for the 3rd step.
Therefore, after Overall Steps was finished, stored video frames was exactly the key frame that is used for carrying out verifying video content in the picture audit buffer, and they have reflected the content overview of all videos section.
The audit of video content is a requisite link for large-scale video sharing platform, and manually to watch video to carry out content auditing efficient one by one very low and utilize.Preferably, the present invention can be applied in the video sharing platform.The present invention circulates dynamic video and changes the verifying video content picture of several static state into, and these pictures have been summarized the content of whole section video, therefore need not displaying video and just can examine fast.
In addition, because the audit picture is compared with original video, data volume is very little, can transfer to long-range picture browsing terminal easily, is convenient to carry out manual examination and verification in the position of concentrating.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, a kind of verifying video content system is characterized in that this system comprises key-frame extraction unit and picture browsing terminal and picture synthesis unit, wherein:
The key-frame extraction unit, be used for extracting adjacent interior frame from pending video data stream, and when described adjacent in the histogram difference of frame during greater than predetermined threshold value, extract frame of video between the frame from described in adjacent, again with the frame of video extracted and described adjacent in frame send to the picture synthesis unit;
The picture synthesis unit is used for described frame of video and adjacent interior frame are synthesized picture, and the picture that is synthesized is sent to the picture browsing terminal;
The picture browsing terminal is used to show that the picture that is synthesized is for manually browsing examining content.
2, verifying video content according to claim 1 system is characterized in that,
Described picture synthesis unit, be used for the frame of video of predetermined quantity and adjacent in frame be spliced into picture with the mode convergent-divergent of N * N, and the spliced picture of described convergent-divergent is sent to the picture browsing terminal;
Described picture browsing terminal is used to show that the spliced picture of described convergent-divergent is for manually browsing examining content.
3, verifying video content according to claim 1 system is characterized in that,
Described picture synthesis unit is used for all converting all frame of video and adjacent interior frame to thumbnail, and described convergent-divergent figure is sent to the picture browsing terminal;
Described picture browsing terminal is used to show that described thumbnail is for manually browsing examining content.
4, verifying video content according to claim 1 system is characterized in that,
The key-frame extraction unit from extracting frame of video between the adjacent interior frame is:
This key-frame extraction unit extracts frame of video according to predetermined interval between described adjacent interior frame.
5, verifying video content according to claim 1 system is characterized in that this system also comprises image sets GOP buffer and key frame buffer, wherein
The GOP buffer, be used to store two of pending video data stream adjacent in frame of video between the frames;
The key-frame extraction unit, be used for extracting described two adjacent interior frames from the GOP buffer, and when described adjacent in the histogram difference of frame during greater than predetermined threshold value, again from described GOP buffer extract described adjacent in frame of video between the frame, again with the frame of video extracted and described adjacent in frame send to the key frame buffer;
The key frame buffer is used to store the frame of video and the interior frame that are provided by the key-frame extraction unit, and provides buffer content to the picture browsing terminal.
6, a kind of verifying video content method is characterized in that, this method comprises:
A, from pending video data stream, extract adjacent in frame, and when described adjacent in the histogram difference of frame during greater than predetermined threshold value, between described adjacent interior frame, extract frame of video;
B, with described frame of video and adjacent in frame synthesize picture, and show that the picture synthesized is for manually browsing examining content.
7, verifying video content method according to claim 6 is characterized in that, described frame of video and adjacent interior frame synthesize picture and comprise:
With the frame of video of predetermined quantity and adjacent in frame be spliced into picture with the mode convergent-divergent of N * N, perhaps with all frame of video and adjacent in frame convert thumbnail to.
8, verifying video content method according to claim 6 is characterized in that, in the steps A from extracting frame of video between the adjacent interior frame is:
Between described adjacent interior frame, extract frame of video according to predetermined interval.
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