CN112597653A - Method for determining information display duration of outdoor multimedia platform - Google Patents
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Abstract
The invention relates to the technical field of multimedia, and discloses a method for determining information display duration of an outdoor multimedia platform, which comprises the following steps: s1: the installation equipment is used for installing the multimedia platform information display equipment; s2: installing a camera, and installing the camera inside or outside the multimedia platform equipment; s3: the data are obtained, the information is obtained through the camera and is paid attention to the time length data, and the length of the information audience attention time obtained through the camera is assumed as follows: x is the number of1，x2，…，xn(ii) a S4: and (6) data cleaning. The invention establishes a mathematical model, obtains an experience distribution function of an information attention duration random variable by using mathematical statistics and nonparametric statistics methods, carries out parameter estimation, determines a plurality of times of attention duration random variables according to preference setting of a system by obtaining relevant digital characteristics of the attention duration random variableAnd the media platform information display duration is used for an actual multimedia information platform cloud control system.
Description
Technical Field
The invention relates to the technical field of multimedia, in particular to a method for determining information display duration of an outdoor multimedia platform.
Background
Today, accessible multimedia content is enormous and shows an increasing trend. A very large amount of information (images, videos, documents, comments on social networks, …) is constantly generated, archived, and shared among numerous users. Under the background, the way for users to acquire concerned information is very important, and an outdoor multimedia information publishing platform generally integrates a plurality of media information into a whole and achieves the best information publishing effect by switching different information at regular time.
For an outdoor multimedia platform, how long each message should be displayed or how long different messages are switched is always a hot problem concerned by the industry, a mathematical model is established for message switching, the message display duration is scientifically and reasonably determined, the message publishing effect can be efficiently achieved, and the waste of social resources can be reduced to the maximum extent.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for determining the information display duration of an outdoor multimedia platform, which mainly solves the problems that the existing outdoor multimedia platform cannot solve the problem that how long each piece of information should be displayed and how long different pieces of information are switched.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme:
a method for determining information display duration of an outdoor multimedia platform comprises the following steps:
s1: the installation equipment is used for installing the multimedia platform information display equipment;
s2: installing a camera, and installing the camera inside or outside the multimedia platform equipment;
s3: data are acquired, information concerned time length data are acquired through a camera, and the length (in seconds) of the information audience concerned time acquired through camera equipment is assumed as follows:
x1,x2,…,xn， (1)
s4: data cleaning: sorting the data in the formula (1) from small to large to obtain:
x(1),x(2),…,x(n)， (2)
let x be(k)The frequency of occurrence is nk，k＝1,2,…,N1It is obvious that
Considering that the attention time of some information audiences is very short, these are not information pages of interest, but pass through the multimedia platform display page, and these data need to be deleted from the above-mentioned data, let:
definition of
Deleting the front face in the formula (2)
Total N3For each data, for the rest
N-N in total3The data is relabeled as:
y(1),y(2),…,y(m) (3)
s5: constructing a distribution function, constructing an empirical distribution function of a random variable of information attention duration, assuming that the information attention duration of the audience is a random variable Y, and constructing the empirical distribution function of the random variable Y according to the data (3) as follows:
s6: determining time length, determining theoretical time length of information display of the multimedia platform, and if the audience with the ratio not less than (1-alpha) 100% can successfully obtain the attention information according to the experience distribution of random variables of the time length of the attention information of the audience, determining the information display time length L1-αThe method comprises the following steps:
s7: setting the actual time length, and setting the actual time length of the information display of the multimedia platform according to the preference:
s8: readjusting, namely setting the information display duration according to a formula (6) according to preference requirements of a superior department or a management department of the multimedia platform cloud control system, and readjusting parameters related to the information display duration in the system.
Based on the foregoing solution, in S1, the multimedia platform information display device is installed at a specific address, and the duration of each information display is initially set to 24 hours.
As a further aspect of the present invention, in S2, the camera has an audience recognition function, and the audience is a person, a vehicle, or the like.
Further, in S3, from the statistical viewpoint, the larger the total data, the better, it is recommended that n is not less than 1000, i.e., n is greater than or equal to 1000.
In addition to the foregoing embodiments, in S4, m is N-N3Let y be(k)The frequency of occurrence is mkK is 1,2, …, M, obviously having M1+m2+…+mM＝m。
In a further aspect of the present invention, in S2, when the cameras are installed, the installation number is counted, and the installed cameras are labeled and the positions are recorded.
(III) advantageous effects
Compared with the prior art, the invention provides a method for determining the information display duration of an outdoor multimedia platform, which has the following beneficial effects:
1. the invention can simplify the data through data cleaning, thereby facilitating the construction of statistics and experience functions and improving the efficiency.
2. The method comprises the steps of establishing a mathematical model, acquiring an empirical distribution function of an information attention duration random variable by using mathematical statistics and nonparametric statistics methods, and performing parameter estimation.
3. And determining the information display duration of the multimedia platform according to the preference setting of the system by obtaining the relevant digital characteristics of the random variable of the concerned duration, wherein the relevant digital characteristics are used for an actual cloud control system of the multimedia information platform.
4. By collecting the information, the time length from the time when each information audience pays attention to the information display page to the time when the audience pays attention to the information display page is obtained.
Drawings
Fig. 1 is a schematic flow chart of a method for determining information display duration of an outdoor multimedia platform according to the present invention.
Fig. 2 is a schematic control procedure flow diagram of a method for determining an information display duration of an outdoor multimedia platform according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1-2, a method for determining information display duration of an outdoor multimedia platform includes the following steps:
s1: the installation equipment is used for installing the multimedia platform information display equipment;
s2: installing a camera, and installing the camera in the multimedia platform equipment;
s3: data are acquired, information concerned time length data are acquired through a camera, and the length (in seconds) of the information audience concerned time acquired through camera equipment is assumed as follows:
x1,x2,…,xn， (1)
s4: data cleaning: sorting the data in the formula (1) from small to large to obtain:
x(1),x(2),…,x(n)， (2)
let x be(k)The frequency of occurrence is nk，k＝1,2,…,N1It is obvious that
Considering that the attention time of some information audiences is very short, some information audiences do not pay attention to information pages and only pass through the display pages of the multimedia platform, and the data needs to be deleted from the data, so that:
definition of
Deleting the front face in the formula (2)
Total N3For each data, for the rest
N-N in total3The data is relabeled as:
y(1),y(2),…,y(m) (3)
data can be simplified through data cleaning, so that statistics and function construction are facilitated, and efficiency is improved;
s5: constructing a distribution function, constructing an empirical distribution function of a random variable of information attention duration, assuming that the information attention duration of the audience is a random variable Y, and constructing the empirical distribution function of the random variable Y according to the data (3) as follows:
establishing a mathematical model, acquiring an empirical distribution function of the information attention duration random variable by using mathematical statistics and nonparametric statistics methods, and performing parameter estimation;
s6: determining time length, determining theoretical time length of information display of the multimedia platform, and if the audience with the ratio not less than (1-alpha) 100% can successfully obtain the attention information according to the experience distribution of random variables of the time length of the attention information of the audience, determining the information display time length L1-αThe method comprises the following steps:
s7: setting the actual time length, and setting the actual time length of the information display of the multimedia platform according to the preference:
s8: readjusting, namely setting the information display duration according to a formula (6) according to preference requirements of a superior department or a management department of the multimedia platform cloud control system, readjusting parameters related to the information display duration in the system, and determining the information display duration of the multimedia platform according to the preference setting of the system by obtaining relevant digital characteristics of random variables of the concerned duration, wherein the relevant digital characteristics are used for the actual multimedia information platform cloud control system.
Hair brushIn the method, in S1, multimedia platform information display devices are installed at specific addresses, the duration of each information display is initially set to 24 hours, in S2, an audience identification function is built in a camera, the audience is people or vehicles, the duration from the beginning of the information display page concerned to the completion of the information display page concerned of each information audience can be obtained, in S3, from the viewpoint of statistics, the larger the total data is, the more preferable the total data is, the recommendation is not lower than 1000, that is, N is greater than or equal to 1000, in S4, m is N-N3Let y be(k)The frequency of occurrence is mkK is 1,2, …, M, obviously having M1+m2+…+mM＝m。
Example 2
Referring to fig. 1-2, a method for determining information display duration of an outdoor multimedia platform includes the following steps:
s1: the installation equipment is used for installing the multimedia platform information display equipment;
s2: installing a camera, and installing the camera outside the multimedia platform equipment;
s3: data are acquired, information concerned time length data are acquired through a camera, and the length (in seconds) of the information audience concerned time acquired through camera equipment is assumed as follows:
x1,x2,…,xn， (1)
s4: data cleaning: sorting the data in the formula (1) from small to large to obtain:
x(1),x(2),…,x(n)， (2)
let x be(k)The frequency of occurrence is nk，k＝1,2,…,N1It is obvious that
Considering that the attention time of some information audiences is very short, some information audiences do not pay attention to information pages and only pass through the display pages of the multimedia platform, and the data needs to be deleted from the data, so that:
definition of
Deleting the front face in the formula (2)
Total N3For each data, for the rest
N-N in total3The data is relabeled as:
y(1),y(2),…,y(m) (3)
data can be simplified through data cleaning, so that statistics and function construction are facilitated, and efficiency is improved;
s5: constructing a distribution function, constructing an empirical distribution function of a random variable of the information attention duration, assuming that the information attention duration of the audience is a random variable Y, and according to the formula (3), constructing the empirical distribution function of the random variable Y as follows:
establishing a mathematical model, acquiring an empirical distribution function of the information attention duration random variable by using mathematical statistics and nonparametric statistics methods, and performing parameter estimation;
s6: determining time length, determining theoretical time length of information display of the multimedia platform, and if the audience with the ratio not less than (1-alpha) 100% can successfully obtain the attention information according to the experience distribution of random variables of the time length of the attention information of the audience, determining the information display time length L1-αThe method comprises the following steps:
s7: setting the actual time length, and setting the actual time length of the information display of the multimedia platform according to the preference:
s8: readjusting, namely setting the information display duration according to a formula (6) according to preference requirements of a superior department or a management department of the multimedia platform cloud control system, readjusting parameters related to the information display duration in the system, and determining the information display duration of the multimedia platform according to the preference setting of the system by obtaining relevant digital characteristics of random variables of the concerned duration, wherein the relevant digital characteristics are used for the actual multimedia information platform cloud control system.
In the invention, multimedia platform information display equipment is installed at a specific address in S1, the time length of each information display is set to be 24 hours, an audience identification function is arranged in an image head in S2, the audience is people or vehicles and the like, the time length from the beginning of paying attention to an information display page to the completion of paying attention to the information display page of each information audience can be obtained, from the point of statistics in S3, the larger the total data is, the better the total data is, the recommendation is not lower than 1000, namely N is not less than 1000, in S4, m is N-N3Let y be(k)The frequency of occurrence is mkK is 1,2, …, M, obviously having M1+m2+…+mMWhen the cameras are mounted, the number of the mounted cameras is counted in S2, and the mounted cameras are numbered and the positions are recorded.
In the description herein, it is noted that relational terms such as first and second, and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A method for determining information display duration of an outdoor multimedia platform is characterized by comprising the following steps:
s1: the installation equipment is used for installing the multimedia platform information display equipment;
s2: installing a camera, and installing the camera inside or outside the multimedia platform equipment;
s3: data are acquired, information concerned time length data are acquired through a camera, and the length (in seconds) of the information audience concerned time acquired through camera equipment is assumed as follows:
x1,x2,…,xn， (1)
s4: data cleaning: sorting the data in the formula (1) from small to large to obtain:
x(1),x(2),…,x(n)， (2)
let x be(k)The frequency of occurrence is nk，k＝1,2,…,N1It is obvious that
Considering that the attention time of some information audiences is extremely short, the information audiences are not real attention information pages and only pass through the display pages of the multimedia platform, and corresponding data needs to be deleted from the data, so that:
definition of
Deleting the front face in the formula (2)
Total N3For each data, for the rest
N-N in total3The data is relabeled as:
y(1),y(2),…,y(m) (3)；
s5: constructing a distribution function, constructing an empirical distribution function of a random variable of information attention duration, assuming that the information attention duration of the audience is a random variable Y, and constructing the empirical distribution function of the random variable Y according to the data (3) as follows:
s6: determining time length, determining theoretical time length of information display of the multimedia platform, and if the audience with the ratio not less than (1-alpha) 100% can successfully obtain the attention information according to the experience distribution of random variables of the time length of the attention information of the audience, determining the information display time length L1-αThe method comprises the following steps:
s7: setting the actual time length, and setting the actual time length of the information display of the multimedia platform according to the preference:
s8: readjusting, namely setting the information display duration according to a formula (6) according to preference requirements of a superior department or a management department of the multimedia platform cloud control system, and readjusting parameters related to the information display duration in the system.
2. The method as claimed in claim 1, wherein in S1, the multimedia platform information display device is installed at a specific address, and the time duration of each information display is initially set to 24 hours.
3. The method as claimed in claim 1, wherein the camera in S2 has an audience recognition function, wherein the audience is a person or a vehicle.
4. The method as claimed in claim 1, wherein the step of S3, wherein the larger the total data, the better the total data is, the recommendation is not less than 1000, i.e. n ≧ 1000.
5. The method as claimed in claim 1, wherein in S4, m-N3Let y be(k)The frequency of occurrence is mkK is 1,2, …, M, obviously having M1+m2+…+mM＝m。
6. The method for determining the information display duration of the outdoor multimedia platform according to claim 1, wherein in the step S2, the installation number is counted when the cameras are installed, the installed cameras are labeled, and the positions are recorded.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103325048A (en) * | 2012-03-23 | 2013-09-25 | 上海凯哲信息科技有限公司 | Networking multimedia information intelligent release control system |
| CN106469159A (en) * | 2015-08-18 | 2017-03-01 | 上海亿动信息技术有限公司 | A kind of big data analysis method based on viewing User Status, apparatus and system |
| CN107798102A (en) * | 2017-10-30 | 2018-03-13 | 北京金堤科技有限公司 | A kind of page display method and device |
| CN108182602A (en) * | 2018-01-03 | 2018-06-19 | 陈顺宝 | A kind of open air multimedia messages Mobile exhibiting system |
| US20180315084A1 (en) * | 2017-04-28 | 2018-11-01 | Lithium Technologies, Inc. | System and method of providing a platform for managing data content campaign on social networks |
| CN110149540A (en) * | 2018-04-27 | 2019-08-20 | 腾讯科技（深圳）有限公司 | Recommendation process method, apparatus, terminal and the readable medium of multimedia resource |
| WO2019206038A1 (en) * | 2018-04-24 | 2019-10-31 | 北京市商汤科技开发有限公司 | Attention information processing method and apparatus, storage medium, and electronic device |
| CN111861524A (en) * | 2019-04-30 | 2020-10-30 | 上海野柿网络科技有限公司 | WeChat platform-based advertisement operation system |
| CN111858969A (en) * | 2019-04-29 | 2020-10-30 | 腾讯科技（深圳）有限公司 | Multimedia data recommendation method and device, computer equipment and storage medium |
-
2020
- 2020-12-24 CN CN202011549184.9A patent/CN112597653B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103325048A (en) * | 2012-03-23 | 2013-09-25 | 上海凯哲信息科技有限公司 | Networking multimedia information intelligent release control system |
| CN106469159A (en) * | 2015-08-18 | 2017-03-01 | 上海亿动信息技术有限公司 | A kind of big data analysis method based on viewing User Status, apparatus and system |
| US20180315084A1 (en) * | 2017-04-28 | 2018-11-01 | Lithium Technologies, Inc. | System and method of providing a platform for managing data content campaign on social networks |
| CN107798102A (en) * | 2017-10-30 | 2018-03-13 | 北京金堤科技有限公司 | A kind of page display method and device |
| CN108182602A (en) * | 2018-01-03 | 2018-06-19 | 陈顺宝 | A kind of open air multimedia messages Mobile exhibiting system |
| WO2019206038A1 (en) * | 2018-04-24 | 2019-10-31 | 北京市商汤科技开发有限公司 | Attention information processing method and apparatus, storage medium, and electronic device |
| CN110149540A (en) * | 2018-04-27 | 2019-08-20 | 腾讯科技（深圳）有限公司 | Recommendation process method, apparatus, terminal and the readable medium of multimedia resource |
| CN111858969A (en) * | 2019-04-29 | 2020-10-30 | 腾讯科技（深圳）有限公司 | Multimedia data recommendation method and device, computer equipment and storage medium |
| CN111861524A (en) * | 2019-04-30 | 2020-10-30 | 上海野柿网络科技有限公司 | WeChat platform-based advertisement operation system |
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