CN105704559A - Poster generation method and apparatus thereof - Google Patents
Poster generation method and apparatus thereof Download PDFInfo
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- CN105704559A CN105704559A CN201610019526.3A CN201610019526A CN105704559A CN 105704559 A CN105704559 A CN 105704559A CN 201610019526 A CN201610019526 A CN 201610019526A CN 105704559 A CN105704559 A CN 105704559A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/458—Scheduling content for creating a personalised stream, e.g. by combining a locally stored advertisement with an incoming stream; Updating operations, e.g. for OS modules ; time-related management operations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
- H04N21/440245—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display the reformatting operation being performed only on part of the stream, e.g. a region of the image or a time segment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/454—Content or additional data filtering, e.g. blocking advertisements
- H04N21/4542—Blocking scenes or portions of the received content, e.g. censoring scenes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
- H04N21/47202—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for requesting content on demand, e.g. video on demand
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/475—End-user interface for inputting end-user data, e.g. personal identification number [PIN], preference data
- H04N21/4756—End-user interface for inputting end-user data, e.g. personal identification number [PIN], preference data for rating content, e.g. scoring a recommended movie
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Human Computer Interaction (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a poster generation method and an apparatus thereof. The method comprises the following steps of determining duration of a target video program, according to the duration and a preset video frame extraction strategy, determining points in time of extracting a frame in the target video program, wherein the number of the points in time is not less than the number of target posters; decoding the target video program; acquiring I frame image data corresponding to each point in time; using an image detection algorithm to determine definition of each I frame image data; according to an order of the definition from high to low, selecting the I frame image data of the number of the target posters and coding to a poster picture. In the invention, manual positioning and manual video frame interception are not needed so that workload is greatly reduced. Further, image definition detection is performed on the plurality of extracted I frame image data, the I frame image data of the numbers of the target posters with highest definition is selected to carry out coding so that high quality of the final-obtained poster picture is guaranteed.
Description
Technical field
The application relates to video detection technology field, more particularly, it relates to a kind of poster generates method and device。
Background technology
Often it will be seen that using excellent for some in the video picture poster as program, use when video frequency program publicizes, introduces in daily life。Namely poster is that with the form of picture, video pictures is showed user。
The poster of existing video frequency program generates method and is generally based on the time point needing capturing picture in artificial designated, and the mode then passing through artificial screenshotss carries out the intercepting of picture。Inventor studies and finds that existing poster generates method and has the disadvantage in that when needing a video frequency program is generated large number of poster, it is necessary to artificial positioning video picture one by one, and intercepts video pictures successively, and workload is huge。Additionally, likely can there is the situation that the definitions such as flower screen, blank screen are not high and then the quality of the poster of impact generation in the video pictures of artificial location。
Summary of the invention
In view of this, this application provides a kind of poster and generate method and device, for solving existing artificial location and intercepting video pictures as existing for the method for video poster, workload is big, video pictures definition is not high and then the problem that affects poster quality。
To achieve these goals, it is proposed that scheme as follows:
A kind of poster generates method, including:
Determine the duration of target video program；
Strategy is extracted, it is determined that extracting the time point of picture in described target video program, the number of described time point is no less than target poster number according to described duration and preset video pictures；
Described target video program is decoded, obtains the I frame image data that each described time point is corresponding；
Utilize image detection algorithm, it is determined that the definition of each described I frame image data；
According to definition order from high to low, choose the I frame image data of target poster number, and be separately encoded into poster picture。
Preferably, the described duration determining target video program, specifically include:
Inquiry electronic program guide (EPG), it is determined that the duration of target video program；
Or,
Detail information according to target video program, it is determined that the duration of target video program。
Preferably, before the described duration determining target video program, the method also includes:
If it is determined that described target video program comprises advertising message, then described target video program is deleted, to reject described advertising message。
Preferably, described tactful according to described duration and the extraction of preset video pictures, it is determined that described target video program to extract the time point of picture, specifically includes:
Number of times is extracted, it is determined that picture extracts interval according to described duration and preset picture；
From described target video program, extract interval every described picture and determine a time point extracting picture。
Preferably, described I frame image data is the yuv data of I two field picture, described utilizes image detection algorithm, it is determined that the definition of each described I frame image data, specifically includes:
Utilizing image detection algorithm, it is determined that the scoring of the yuv data of each described I two field picture, described scoring is used for showing definition degree, and more fine definition of marking is more high。
A kind of poster generates device, including:
Program duration determines unit, for determining the duration of target video program；
Time point determines unit, for extracting strategy according to described duration and preset video pictures, it is determined that extracting the time point of picture in described target video program, the number of described time point is no less than target poster number；
Image data acquisition unit, for described target video program is decoded, obtains the I frame image data that each described time point is corresponding；
Image detecting element, is used for utilizing image detection algorithm, it is determined that the definition of each described I frame image data；
Poster picture generates unit, for according to definition order from high to low, choosing the I frame image data of target poster number, and be separately encoded into poster picture。
Preferably, described program duration determines that unit includes:
First program duration determines subelement, is used for inquiring about electronic program guide (EPG), it is determined that the duration of target video program；
Second program duration determines subelement, for the detail information according to target video program, it is determined that the duration of target video program。
Preferably, also include:
Advertising message culling unit, for before described program duration determines unit, however, it is determined that described target video program comprises advertising message, then described target video program is deleted, to reject described advertising message。
Preferably, described time point determines that unit includes:
Very first time point determines subelement, for extracting number of times according to described duration and preset picture, it is determined that picture extracts interval；
Second time point determines subelement, for, from described target video program, extracting interval every described picture and determine a time point extracting picture。
Preferably, described I frame image data is the yuv data of I two field picture；
Described image detecting element includes:
Unit is determined in scoring, is used for utilizing image detection algorithm, it is determined that the scoring of the yuv data of each described I two field picture, and described scoring is used for showing definition degree, and more fine definition of marking is more high。
Can be seen that from above-mentioned technical scheme, the poster that the embodiment of the present application provides generates method, first the duration of target video program is determined, and then extract strategy according to described duration and preset video pictures, determine the time point extracting picture in target video program, wherein, the number of time point is no less than target poster number, target video program is decoded, obtain the I frame image data that each described time point is corresponding, utilize image detection algorithm, determine the definition of each I frame image data, according to definition order from high to low, choose the I frame image data of target poster number, it is encoded into poster picture。The application need not manually position and intercept video pictures, thus greatly reducing workload。Further, by the multiple I frame image datas extracted are carried out image definition detection, the I frame image data choosing the highest target poster number of definition is encoded, it is ensured that the high-quality of the poster picture finally given。
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only embodiments herein, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided。
Fig. 1 is that the disclosed a kind of poster of the embodiment of the present application generates method flow diagram；
Fig. 2 is that the disclosed another kind of poster of the embodiment of the present application generates method flow diagram；
Fig. 3 is that the embodiment of the present application another poster disclosed generates method flow diagram；
Fig. 4 is that the disclosed a kind of poster of the embodiment of the present application generates apparatus structure schematic diagram；
Fig. 5 is that the disclosed a kind of program duration of the embodiment of the present application determines cellular construction schematic diagram；
Fig. 6 is that the disclosed another kind of poster of the embodiment of the present application generates apparatus structure schematic diagram；
Fig. 7 is that the disclosed a kind of time point of the embodiment of the present application determines cellular construction schematic diagram。
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments。Based on the embodiment in the application, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of the application protection。
It is that the disclosed a kind of poster of the embodiment of the present application generates method flow diagram referring to Fig. 1, Fig. 1。
As it is shown in figure 1, the method includes:
Step S100, determine the duration of target video program；
Specifically, target video program such as is at the video frequency program of poster to be produced。There is a playing duration in each video frequency program, determines the playing duration of target video program in this step。
Step S110, extract strategy according to described duration and preset video pictures, it is determined that described target video program extracts the time point of picture；
Wherein, the number of described time point is no less than target poster number。Target poster number is for target video program, the number of the required poster made of user。General, the number of time point is all multiple。
Specifically, the application is prefixed video pictures and extracts strategy, namely sets the extraction number of times of video pictures and extract time point。And then, extract strategy and duration according to video pictures, it is determined that target video program extracts the time point of picture。
Step S120, described target video program is decoded, obtains the I frame image data that each described time point is corresponding；
Wherein, I frame is also key frame, and it is the important frame in video inter-frame compression coding；It is the coded frame of a full frame compression；Only use the data of I frame with regard to restructural complete image during decoding。
Specifically, the above-mentioned time point having determined that picture extracts, and then to decoded target video program, obtain the I frame image data of each time point。
Step S130, utilize image detection algorithm, it is determined that the definition of each described I frame image data；
Specifically, image detection algorithm can adopt the image detection algorithm of existing maturation, and image detection algorithm is used for determining the definition of I frame image data, and then for follow-up high-definition image data of choosing to make poster picture offer foundation。
Step S140, according to definition order from high to low, choose the I frame image data of target poster number, and be separately encoded into poster picture。
Specifically, the above-mentioned number having been described above I frame image data is no less than target poster number, therefore this step needs to choose the I frame image data of the high target poster number of definition, and then each I frame image data chosen is encoded, obtain poster picture, ultimately generate the poster picture of target poster number。
The poster that the embodiment of the present application provides generates method, first the duration of target video program is determined, and then extract strategy according to described duration and preset video pictures, determine the time point extracting picture in target video program, wherein, the number of time point is no less than target poster number, target video program is decoded, obtain the I frame image data that each described time point is corresponding, utilize image detection algorithm, determine the definition of each I frame image data, according to definition order from high to low, choose the I frame image data of target poster number, it is encoded into poster picture。The application need not manually position and intercept video pictures, thus greatly reducing workload。Further, by the multiple I frame image datas extracted are carried out image definition detection, the I frame image data choosing the highest target poster number of definition is encoded, it is ensured that the high-quality of the poster picture finally given。
Optionally, the process of the above-mentioned duration determining target video program, can there is different duration defining method for different target video program。
To review video frequency program, electronic program guide (EPG) have recorded its play start time and end time, and then by inquiring about electronic program guides, it may be determined that the duration of target video program。
For order video program, its detail information can be obtained after player loaded targets video frequency program, and then show the duration of target video program to user。
It is that the disclosed another kind of poster of the embodiment of the present application generates method flow diagram referring to Fig. 2, Fig. 2。
As in figure 2 it is shown, the method includes:
Described target video program if it is determined that described target video program comprises advertising message, is then deleted by step S200, to reject described advertising message；
Specifically, likely comprising advertising message in target video program, advertising message is typically in program start and program termination, and this part advertising message is usually useless video pictures, it is unfavorable for making poster, the advertising message in target video program can be deleted for this。
Optionally, in order to simple to operate, the application can select directly to delete 1/5 before target video program and 1/5 video below。Certainly, 1/5 is only a citing, and it can also is that other numerical value, determines according to practical situation。
Step S210, determine the duration of target video program；
Specifically, the target video program in this step is the target video program after the advertising message of previous step is deleted。
Step S220, extract strategy according to described duration and preset video pictures, it is determined that described target video program extracts the time point of picture；
Wherein, the target video program in this step is the target video program after previous step is deleted, does not wherein contain optical information。
Specifically, the application is prefixed video pictures and extracts strategy, namely sets the extraction number of times of video pictures and extract time point。And then, extract strategy and duration according to video pictures, it is determined that target video program extracts the time point of picture。
Step S230, described target video program is decoded, obtains the I frame image data that each described time point is corresponding；
Wherein, I frame is also key frame, and it is the important frame in video inter-frame compression coding；It is the coded frame of a full frame compression；Only use the data of I frame with regard to restructural complete image during decoding。
Specifically, the above-mentioned time point having determined that picture extracts, and then to decoded target video program, obtain the I frame image data of each time point。
Step S240, utilize image detection algorithm, it is determined that the definition of each described I frame image data；
Specifically, image detection algorithm can adopt the image detection algorithm of existing maturation, and image detection algorithm is used for determining the definition of I frame image data, and then for follow-up high-definition image data of choosing to make poster picture offer foundation。
Step S250, according to definition order from high to low, choose the I frame image data of target poster number, and be separately encoded into poster picture。
Specifically, the above-mentioned number having been described above I frame image data is no less than target poster number, therefore this step needs to choose the I frame image data of the high target poster number of definition, and then each I frame image data chosen is encoded, obtain poster picture, ultimately generate the poster picture of target poster number。
Compared to a upper embodiment, the present embodiment adds the deletion action to target video program advertising message so that remaining video is programme information, it is ensured that the quality of the poster picture of making。
It is that the embodiment of the present application another poster disclosed generates method flow diagram referring to Fig. 3, Fig. 3。
As it is shown on figure 3, the method includes:
Described target video program if it is determined that target video program comprises advertising message, is then deleted by step S300, to reject described advertising message；
Specifically, likely comprising advertising message in target video program, advertising message is typically in program start and program termination, and this part advertising message is usually useless video pictures, it is unfavorable for making poster, the advertising message in target video program can be deleted for this。
Step S310, determine the duration of target video program；
Specifically, the target video program in this step is the target video program after the advertising message of previous step is deleted。
Step S320, extract number of times according to described duration and preset picture, it is determined that picture extracts interval；
Specifically, the application is prefixed picture according to actual needs and extracts number of times。Picture extracts number of times no less than target poster number。Duration and picture according to target video program extract number of times, it is determined that picture extracts interval。
Step S330, from described target video program, every described picture extract interval determine one extract picture time point；
Citing as:
It is 100 that the preset picture of the present embodiment extracts number of times, it is stipulated that delete head and run-out each 1/5 advertising message。
With the target video program of broadcast during 12:00--1:00 1 hour, before removing, below after each 1/5, then effecting surplus section is 12:12--12:48, and remaining effective duration is 36 minutes, namely also surplus 2160 seconds。2160/100=21, can take a video pictures within the remaining video time period every 21 seconds。Therefore Automatic Program takes the time point of picture is 12:12:00,12:12:12,12:12:24,12:12:36.... respectively
Step S340, described target video program is decoded, obtains the I frame image data that each described time point is corresponding；
Wherein, I frame is also key frame, and it is the important frame in video inter-frame compression coding；It is the coded frame of a full frame compression；Only use the data of I frame with regard to restructural complete image during decoding。
Specifically, the above-mentioned time point having determined that picture extracts, and then to decoded target video program, obtain the I frame image data of each time point。
Step S350, utilize image detection algorithm, it is determined that the definition of each described I frame image data；
Specifically, image detection algorithm can adopt the image detection algorithm of existing maturation, and image detection algorithm is used for determining the definition of I frame image data, and then for follow-up high-definition image data of choosing to make poster picture offer foundation。
Step S360, according to definition order from high to low, choose the I frame image data of target poster number, and be separately encoded into poster picture。
Specifically, the above-mentioned number having been described above I frame image data is no less than target poster number, therefore this step needs to choose the I frame image data of the high target poster number of definition, and then each I frame image data chosen is encoded, obtain poster picture, ultimately generate the poster picture of target poster number。
The determination process of the time point extracting picture is described by the present embodiment on the basis of Fig. 2, it is to be understood that the determination being also based on the Fig. 1 time point to extracting picture is introduced。
Optionally, the I frame image data of above-mentioned acquisition can be the yuv data of I two field picture。Passing through image detection algorithm, it may be determined that the scoring of the yuv data of each I two field picture, this scoring is used for showing definition degree, and marking, more high to represent definition more high。
And then, finally choose the yuv data of the I two field picture of the highest target poster number of scoring, after being encoded, generate poster picture。
Optionally, general, poster picture all needs to embody personage。That is, poster picture needs to comprise face characteristic。Therefore, above-mentioned image detection algorithm can be specifically method for detecting human face。During Face datection, first the I two field picture of acquisition is carried out gray proces, generate gray level image, and decide whether that narrowing down to suitable size processes the time to reduce the later stage according to image resolution ratio。Further, use OpenCV (OpenSourceComputerVisionLibrary, computer vision of increasing income storehouse) in the cascade classifier identification face based on haar feature, face characteristic storehouse uses the haarcascade_frontalface_alt.xml that carries of OpenCV。After detecting human face region, then identifying human eye inside human face region, human eye feature storehouse uses haarcascade_eye_tree_eyeglasses.xml。Finally, current image being given a mark, total marking strategy combines the definition of the number of face, size, position and human eye。
The poster below the embodiment of the present application provided generates device and is described, and poster described below generates device can mutually to should refer to above-described poster generation method。
It is that the disclosed a kind of poster of the embodiment of the present application generates apparatus structure schematic diagram referring to Fig. 4, Fig. 4。
As shown in Figure 4, poster generation device includes:
Program duration determines unit 41, for determining the duration of target video program；
Time point determines unit 42, for extracting strategy according to described duration and preset video pictures, it is determined that extracting the time point of picture in described target video program, the number of described time point is no less than target poster number；
Image data acquisition unit 43, for described target video program is decoded, obtains the I frame image data that each described time point is corresponding；
Image detecting element 44, is used for utilizing image detection algorithm, it is determined that the definition of each described I frame image data；
Poster picture generates unit 45, for according to definition order from high to low, choosing the I frame image data of target poster number, and be separately encoded into poster picture。
The poster that the embodiment of the present application provides generates device, first the duration of target video program is determined, and then extract strategy according to described duration and preset video pictures, determine the time point extracting picture in target video program, wherein, the number of time point is no less than target poster number, target video program is decoded, obtain the I frame image data that each described time point is corresponding, utilize image detection algorithm, determine the definition of each I frame image data, according to definition order from high to low, choose the I frame image data of target poster number, it is encoded into poster picture。The application need not manually position and intercept video pictures, thus greatly reducing workload。Further, by the multiple I frame image datas extracted are carried out image definition detection, the I frame image data choosing the highest target poster number of definition is encoded, it is ensured that the high-quality of the poster picture finally given。
Optionally, Fig. 5 illustrates the application above-mentioned program duration and determines the optional structure of one of unit, as it is shown in figure 5, program duration determines that unit 41 may include that
First program duration determines subelement 411, is used for inquiring about electronic program guide (EPG), it is determined that the duration of target video program；
Second program duration determines subelement 412, for the detail information according to target video program, it is determined that the duration of target video program。
Optionally, the embodiment of the present application discloses above-mentioned poster and generates the optional structure of another kind of device, in conjunction with Fig. 4 and Fig. 6 it can be seen that poster generation device can also include:
Advertising message culling unit 46, for before described program duration determines unit 41, however, it is determined that described target video program comprises advertising message, then described target video program is deleted, to reject described advertising message。
Optionally, Fig. 7 illustrates the above-mentioned time point of the application and determines the optional structure of one of unit, as it is shown in fig. 7, time point determines that unit 42 may include that
Very first time point determines subelement 421, for extracting number of times according to described duration and preset picture, it is determined that picture extracts interval；
Second time point determines subelement 422, for, from described target video program, extracting interval every described picture and determine a time point extracting picture。
Optionally, described I frame image data is the yuv data of I two field picture；Described image detecting element includes:
Unit is determined in scoring, is used for utilizing image detection algorithm, it is determined that the scoring of the yuv data of each described I two field picture, and described scoring is used for showing definition degree, and more fine definition of marking is more high。
Finally, it can further be stated that, in this article, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially。And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include the process of a series of key element, method, article or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment。When there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, article or equipment。
In this specification, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually referring to。
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the application。The multiple amendment of these embodiments be will be apparent from for those skilled in the art, and generic principles defined herein when without departing from spirit herein or scope, can realize in other embodiments。Therefore, the application is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty。
Claims (10)
1. a poster generates method, it is characterised in that including:
Determine the duration of target video program；
Strategy is extracted, it is determined that extracting the time point of picture in described target video program, the number of described time point is no less than target poster number according to described duration and preset video pictures；
Described target video program is decoded, obtains the I frame image data that each described time point is corresponding；
Utilize image detection algorithm, it is determined that the definition of each described I frame image data；
According to definition order from high to low, choose the I frame image data of target poster number, and be separately encoded into poster picture。
2. method according to claim 1, it is characterised in that the described duration determining target video program, specifically includes:
Inquiry electronic program guide (EPG), it is determined that the duration of target video program；
Or,
Detail information according to target video program, it is determined that the duration of target video program。
3. method according to claim 1, it is characterised in that before the described duration determining target video program, the method also includes:
If it is determined that described target video program comprises advertising message, then described target video program is deleted, to reject described advertising message。
4. method according to claim 1, it is characterised in that described tactful according to described duration and the extraction of preset video pictures, it is determined that to extract the time point of picture in described target video program, specifically include:
Number of times is extracted, it is determined that picture extracts interval according to described duration and preset picture；
From described target video program, extract interval every described picture and determine a time point extracting picture。
5. method according to claim 1, it is characterised in that described I frame image data is the yuv data of I two field picture, described utilizes image detection algorithm, it is determined that the definition of each described I frame image data, specifically includes:
Utilizing image detection algorithm, it is determined that the scoring of the yuv data of each described I two field picture, described scoring is used for showing definition degree, and more fine definition of marking is more high。
6. a poster generates device, it is characterised in that including:
Program duration determines unit, for determining the duration of target video program；
Time point determines unit, for extracting strategy according to described duration and preset video pictures, it is determined that extracting the time point of picture in described target video program, the number of described time point is no less than target poster number；
Image data acquisition unit, for described target video program is decoded, obtains the I frame image data that each described time point is corresponding；
Image detecting element, is used for utilizing image detection algorithm, it is determined that the definition of each described I frame image data；
Poster picture generates unit, for according to definition order from high to low, choosing the I frame image data of target poster number, and be separately encoded into poster picture。
7. device according to claim 6, it is characterised in that described program duration determines that unit includes:
First program duration determines subelement, is used for inquiring about electronic program guide (EPG), it is determined that the duration of target video program；
Second program duration determines subelement, for the detail information according to target video program, it is determined that the duration of target video program。
8. device according to claim 6, it is characterised in that also include:
Advertising message culling unit, for before described program duration determines unit, however, it is determined that described target video program comprises advertising message, then described target video program is deleted, to reject described advertising message。
9. device according to claim 6, it is characterised in that described time point determines that unit includes:
Very first time point determines subelement, for extracting number of times according to described duration and preset picture, it is determined that picture extracts interval；
Second time point determines subelement, for, from described target video program, extracting interval every described picture and determine a time point extracting picture。
10. device according to claim 6, it is characterised in that described I frame image data is the yuv data of I two field picture；
Described image detecting element includes:
Unit is determined in scoring, is used for utilizing image detection algorithm, it is determined that the scoring of the yuv data of each described I two field picture, and described scoring is used for showing definition degree, and more fine definition of marking is more high。
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