CN113901249A - Screen factor adapting method and system compatible with new display equipment - Google Patents
Screen factor adapting method and system compatible with new display equipment Download PDFInfo
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- CN113901249A CN113901249A CN202111154097.8A CN202111154097A CN113901249A CN 113901249 A CN113901249 A CN 113901249A CN 202111154097 A CN202111154097 A CN 202111154097A CN 113901249 A CN113901249 A CN 113901249A
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Abstract
The invention particularly relates to a screen factor adapting method compatible with new display equipment, which comprises the following steps: s100, connecting the new display with a host, and installing an invisible watermark program in the host; s200, switching screen factors in the invisible watermark program, and shooting an image of a new display under each screen factor; s300, tracing the source of the shot image and obtaining evidence; s400, according to the evidence obtaining result, taking the minimum screen factor with the evidence obtaining success rate being more than or equal to a set threshold value as the optimal screen factor of the new display; a corresponding adaptation system is also disclosed. By the screen factor adapting method, displays of any model can be conveniently adapted, different screen factors are configured for displays of each model, so that the influence of the imaging color difference of the displays on the invisible watermarks is made up, the visual effect and the success rate of tracing evidence collection after the invisible watermarks are added to the displays are improved, and the problem of adapting of new displays is solved.
Description
Technical Field
The invention relates to the technical field of screen shooting invisible watermarks, in particular to a screen factor adapting method and system compatible with new display equipment.
Background
At present, the mainstream computer adopts a liquid crystal display screen, and the development principle is that liquid crystal is placed between two pieces of conductive glass, and the electric field effect of twisted nematic of liquid crystal molecules is caused by the driving of an electric field between two electrodes. So as to control the transmission or shielding function of the light source and generate brightness between the power switch to display the image. The digital RGB image signals output by the display card of the computer host are transmitted to the drive board circuit in the LCD through the display interface, the microprocessor in the main control circuit sends out instructions to the image processing chip, and the time sequence conversion circuit in the image processor receives the line and field synchronizing signals and generates the column synchronizing signals, the line synchronizing signals and the shift pulses CP together with the clock signals.
At present, an information system mainly adopts safety measures such as physical isolation, access control, data encryption, behavior audit and the like, so that the safety problem of electronic data in storage and transmission is solved, but along with the development of informatization, particularly the popularization of a smart phone, a display screen becomes an important safety control gap, the display screen has various types of equipment, the screen material is various, the display screen is widely used in daily office, but a computer display does not have a function of preventing disclosure, in some departments or public institutions needing to prevent disclosure, the threat of disclosure caused by shooting the screen and the like is increasingly severe, the display screen becomes a serious disaster area of losing the management and control, and effective management and control measures are urgently needed.
In order to solve the above problems, a conventional method is to add an "invisible watermark" or a "vector watermark" on a display screen, and when a secret divulgence phenomenon caused by shooting a screen or screen capture occurs, only the divulgence picture needs to be led into a forensics platform to perform source tracing forensics, and the invisible watermark and information contained in the watermark are extracted, so that the divulgence equipment and personnel can be traced. But because of the different light-emitting panel type processes of each type of display, the colors of the displays are slightly different when the displays are imaged, and the difference also has an influence on the invisible watermarks; in order to ensure the source tracing and evidence obtaining effects, a parameter such as a screen factor is introduced, and parameters such as transparency, color and the like of a watermark embedding algorithm are adjusted through the factor, so that screen panels of different models achieve similar watermark embedding effects. How to determine the optimal screen factor ensures the success rate of tracing and forensics under the condition of minimal influence on vision, and is a key problem in screen capture divulgence tracing and forensics products.
Disclosure of Invention
The invention aims to provide a screen factor adapting method compatible with new display equipment, which can adapt to an optimal screen factor for a display and ensure the effect of embedding a watermark in the screen.
In order to realize the purpose, the invention adopts the technical scheme that: a screen factor adapting method compatible with new display equipment comprises the following steps: s100, connecting the new display with a host, and installing an invisible watermark program in the host; s200, switching screen factors in the invisible watermark program, and shooting an image of a new display under each screen factor; s300, tracing the source of the shot image and obtaining evidence; s400, according to the evidence obtaining result, taking the minimum screen factor with the evidence obtaining success rate being larger than or equal to the set threshold value as the optimal screen factor of the new display.
Compared with the prior art, the invention has the following technical effects: by the screen factor adapting method, displays of any model can be conveniently adapted, different screen factors are configured for displays of each model, so that the influence of the imaging color difference of the displays on the invisible watermarks is made up, the visual effect and the success rate of tracing evidence collection after the invisible watermarks are added to the displays are improved, and the problem of adapting of new displays is solved.
Another objective of the present invention is to provide a screen factor adapting system compatible with a new display device, which optimizes the adapting process of the display device and facilitates the adapting of the new display device.
In order to realize the purpose, the invention adopts the technical scheme that: a screen factor adapting system compatible with new display equipment comprises a server and a plurality of clients connected with the server, wherein screen factor configuration files are synchronously stored in the clients and the server, and the model of a display and an optimal screen factor corresponding to the model are stored in the screen factor configuration files; the client is internally provided with a new display adaptation module and a watermark module, the new display adaptation module judges whether the model of the display accessed by the client is in a screen factor configuration file, if so, the new display adaptation module outputs the screen factor corresponding to the model of the display to the watermark module, if not, the new display adaptation module adapts the newly accessed display to obtain the optimal screen factor corresponding to the model of the display and outputs the optimal screen factor to the watermark module, and meanwhile, the model of the display and the optimal screen factor corresponding to the model of the display are stored in the screen factor configuration file.
Compared with the prior art, the invention has the following technical effects: all adapted displays and the corresponding optimal screen factors are stored by setting a screen factor configuration file, and the file is synchronized between a server and all clients, so that the optimal screen factors can be obtained through the configuration file when any client has the input display access; meanwhile, the new display adaptation module can adapt to the new display conveniently, and the adaptation result is stored, so that the best screen factor can be directly acquired when the same type of display is accessed next time, and the adaptation process of the display is simplified through the system.
Drawings
FIG. 1 is a diagram illustrating a first embodiment of determining an optimal screen factor according to the present invention;
FIG. 2 is a diagram illustrating a second embodiment of determining an optimal screen factor according to the present invention;
FIG. 3 is a flow chart of display adaptation in the present invention;
fig. 4 is a flow chart of the profile application in the present invention.
Detailed Description
The present invention will be described in further detail with reference to fig. 1 to 4.
The invention discloses a screen factor adapting method compatible with new display equipment, which comprises the following steps: s100, connecting the new display with a host, and installing an invisible watermark program in the host; s200, switching screen factors in the invisible watermark program, and shooting an image of a new display under each screen factor; s300, tracing the source of the shot image and obtaining evidence; s400, according to the evidence obtaining result, taking the minimum screen factor with the evidence obtaining success rate being larger than or equal to the set threshold value as the optimal screen factor of the new display. By the screen factor adapting method, displays of any model can be conveniently adapted, different screen factors are configured for displays of each model, so that the influence of the imaging color difference of the displays on the invisible watermarks is made up, the visual effect and the success rate of tracing evidence collection after the invisible watermarks are added to the displays are improved, and the problem of adapting of new displays is solved.
Further, in order to ensure that the optimal screen factor obtained according to the evidence obtaining result is more accurate, the invention collects a plurality of groups of images. In step S200, a new display image is captured as follows: s201, adjusting screen factors to a minimum value, shooting L images on the front surface of a new display, wherein the L can be set according to requirements, such as 5 images, 20 images and the like, and the screen display content corresponding to each image is changed, so that corresponding evidence obtaining results can be ensured for various display contents, and the applicability of the subsequently obtained optimal screen factors can be further improved; s202, keeping the screen factor unchanged, adjusting the shooting angle to obtain N x L images under the screen factor, wherein N is the number of all the shooting angles, and the shooting angles can be front, left designated angle, right designated angle, upper designated angle and lower designated angle, or combination of up, down, left and right; s203, switching screen factors one by one, and shooting a plurality of images of a new display at a plurality of angles under each screen factor to obtain M N L images, wherein M is the number of values that the screen factor can take, and the screen factor is a parameter of an invisible watermark program when the watermark is added to the screen, and by the factor, the display intensity of the invisible watermark on the screen can be adjusted, and the higher the screen factor is, the better the evidence obtaining success rate is, but the visual effect of the screen is poor, so that an optimal screen factor needs to be determined for the screen.
There are many ways to calculate the optimal screen factor according to the forensics results, and two preferable schemes are provided in the present invention as follows.
Referring to fig. 1, in the first embodiment, in step S400, the screen factors are switched from small to large one by one, and the tracing and forensics success rate r of the picture under each screen factor is calculated, where r is defined as follows: dividing the total number of the successfully-obtained pictures at each angle by the total number of the pictures; and if the evidence obtaining success rate of the current screen factor is larger than or equal to a first set threshold value, taking the current screen factor as the optimal screen factor of the new display. The method comprises the steps of firstly calculating the evidence obtaining success rate of a shot image when the screen factor is 4, and if the evidence obtaining success rate is lower than a first set threshold value, then calculating the evidence obtaining success rates of the screen factors 5, 6 and 7 … … in sequence, and stopping calculation until the evidence obtaining success rate is larger than or equal to the first set threshold value. In actual execution, all images can be shot well first, then the step is executed, or the image under one screen factor can be shot and then directly calculated, and if the conditions are met, the images under other screen factors are not shot.
Referring to fig. 2, in the second embodiment, the step S400 includes the following steps: s410, distributing weight to each shooting angle; s420, obtaining the evidence obtaining results of the screen factor and the screen factors after the screen factor is in order for any screen factor, wherein the result of successful evidence obtaining is recorded as 1, and the result of failure or error of evidence obtaining is recorded as 0; s430, calculating the weighted sum of the forensics results; and S440, comparing the weighted sum with a second set threshold value, and if the weighted sum is greater than or equal to the second set threshold value, taking the screen factor as the optimal screen factor of the new display. By assigning different weights to each angle and aiming at the current screen factor and a plurality of screen factors behind the current screen factor when the weighted sum is obtained, the weighted sum obtained by calculation has more reference value. The screen factors after the order can be understood as follows: assuming that the current screen factor is 6, we want to obtain 3 screen factors after the order, namely 7, 8, and 9. Meanwhile, the weight can be set according to needs, and represents the influence of the forensics result of each angle on the determination of the optimal screen factor, and the weight is larger when the influence is larger. The final second setting threshold can also be set as required, which is related to the requirement of the success rate of forensics and the requirement of vision, if the requirement of the success rate of forensics is high, the second setting threshold can be set to be larger, and if the requirement of vision is high, the second setting threshold can be set to be smaller.
Further, in step S420, for any screen factor, the screen factor and the forensic results of the 1-5 screen factors after the screen factor is ranked are calculated, that is, the forensic results of 2-6 screen factors can be framed by the dashed line frame in fig. 2 each time. And filling the evidence obtaining result of the last screen factor when the screen factors are insufficient after the order, thereby avoiding the phenomenon that the screen factors are insufficient when the following screen factors are calculated.
The invention also discloses a screen factor adapting system compatible with the new display equipment, which comprises a server and a plurality of clients connected with the server, wherein screen factor configuration files are synchronously stored in the clients and the server, and the screen factor configuration files store the model of the display and the optimal screen factor corresponding to the model; the client is internally provided with a new display adaptation module and a watermark module, the new display adaptation module judges whether the model of the display accessed by the client is in a screen factor configuration file, if so, the new display adaptation module outputs the screen factor corresponding to the model of the display to the watermark module, if not, the new display adaptation module adapts the newly accessed display to obtain the optimal screen factor corresponding to the model of the display and outputs the optimal screen factor to the watermark module, and meanwhile, the model of the display and the optimal screen factor corresponding to the model of the display are stored in the screen factor configuration file. All adapted displays and the corresponding optimal screen factors are stored by setting a screen factor configuration file, and the file is synchronized between a server and all clients, so that the optimal screen factors can be obtained through the configuration file when any client has the input display access; meanwhile, the new display adaptation module can conveniently adapt to the new display, and the adaptation result is stored, so that the best screen factor can be directly acquired when the next display with the same model is accessed, and the system can realize that only one adaptation is needed for a new display at a time. I.e. single fit, lifelong availability; single point adaptation, globally available. The adaptation efficiency is constantly improved.
Referring to fig. 3, specifically, the new display adaptation module performs adaptation of the new display according to the following steps:
A. the client monitors the access of the display in real time, and when the monitor monitors that the display is accessed, the model of the display is compared with the display signal stored in the screen factor configuration file to judge whether the display is a new display;
B. if the display is a new display, executing the next step; if the display is the existing display, the process is ended;
C. popping up an adaptive window to finish screen image photographing and acquisition under different screen factors;
D. after the acquired screen image is processed by an algorithm, automatically outputting an optimal screen factor corresponding to the type display;
E. adding the display model number and the optimal screen factor thereof to a screen factor configuration file;
F. and judging whether the client can communicate with the server, if so, automatically uploading the screen factor configuration file to the server, and if not, manually importing the screen factor configuration file to the server.
Referring to fig. 4, further, in the step a, the screen factor configuration file is obtained according to the following steps: judging that the client can communicate with the server; if the screen factor configuration file is not available, the latest screen factor configuration file is manually exported from the server and then is manually imported into the client. Through the process, the synchronization of the screen factor configuration files on the clients can be conveniently realized.
Further, in the step C, a new display image is shot according to the steps S201 to S203; in the step D, the optimal screen factor is obtained according to the steps S410 to S440, and the advantages of these steps have been described in detail above, and are not described herein again.
By the system, the automatic adaptation of the factor parameters of the new display screen is realized, and the parameters are stored into a configuration file and automatically uploaded or imported to a server. The server side can issue the configuration file of the new display to each client side under the network through the network, so as to complete the issue of the parameters of the new display and simplify the configuration flow.
Claims (10)
1. A screen factor adapting method compatible with new display equipment is characterized in that: the method comprises the following steps:
s100, connecting the new display with a host, and installing an invisible watermark program in the host;
s200, switching screen factors in the invisible watermark program, and shooting an image of a new display under each screen factor;
s300, tracing the source of the shot image and obtaining evidence;
s400, according to the evidence obtaining result, taking the minimum screen factor with the evidence obtaining success rate being larger than or equal to the set threshold value as the optimal screen factor of the new display.
2. The screen factor adaptation method compatible with new display devices of claim 1, wherein: in step S200, a new display image is captured as follows:
s201, adjusting a screen factor to a minimum value, and shooting L images of the front face of a new display;
s202, keeping the screen factor unchanged, and adjusting the shooting angles to obtain N x L images under the screen factor, wherein N is the number of all the shooting angles;
s203, switching the screen factors one by one, and shooting a plurality of images of the new display at a plurality of angles under each screen factor to obtain M images N L images, wherein M is the number of the screen factors which can be taken.
3. The screen factor adaptation method compatible with new display devices of claim 2, wherein: in the step S400, the screen factors are switched one by one from small to large, and the tracing and evidence obtaining success rate r of the picture under each screen factor is calculated, where r is defined as follows: dividing the total number of the successfully-obtained pictures at each angle by the total number of the pictures; and if the evidence obtaining success rate of the current screen factor is larger than or equal to a first set threshold value, taking the current screen factor as the optimal screen factor of the new display.
4. The screen factor adaptation method compatible with new display devices of claim 2, wherein: the step S400 includes the following steps:
s410, distributing weight to each shooting angle;
s420, obtaining the evidence obtaining results of the screen factor and the screen factors after the screen factor is in order for any screen factor, wherein the result of successful evidence obtaining is recorded as 1, and the result of failure or error of evidence obtaining is recorded as 0;
s430, calculating the weighted sum of the forensics results;
and S440, comparing the weighted sum with a second set threshold value, and if the weighted sum is greater than or equal to the second set threshold value, taking the screen factor as the optimal screen factor of the new display.
5. The screen factor adaptation method compatible with new display devices of claim 4, wherein: in step S420, for any screen factor, the forensics results of the screen factor and its corresponding 1-5 screen factors are calculated, and the forensics results of the last screen factor with insufficient screen factors are filled.
6. A screen factor adaptation system compatible with new display devices, comprising: the system comprises a server and a plurality of clients connected with the server, wherein screen factor configuration files are synchronously stored in the clients and the server, and the screen factor configuration files store the model of a display and the optimal screen factor corresponding to the model; the client is internally provided with a new display adaptation module and a watermark module, the new display adaptation module judges whether the model of the display accessed by the client is in a screen factor configuration file, if so, the new display adaptation module outputs the screen factor corresponding to the model of the display to the watermark module, if not, the new display adaptation module adapts the newly accessed display to obtain the optimal screen factor corresponding to the model of the display and outputs the optimal screen factor to the watermark module, and meanwhile, the model of the display and the optimal screen factor corresponding to the model of the display are stored in the screen factor configuration file.
7. The screen factor adaptation system for a compatible new display device of claim 6, wherein: the new display adaptation module adapts the new display according to the following steps:
A. the client monitors the access of the display in real time, and when the monitor monitors that the display is accessed, the model of the display is compared with the display signal stored in the screen factor configuration file to judge whether the display is a new display;
B. if the display is a new display, executing the next step; if the display is the existing display, the process is ended;
C. popping up an adaptive window to finish screen image photographing and acquisition under different screen factors;
D. after the acquired screen image is processed by an algorithm, automatically outputting an optimal screen factor corresponding to the type display;
E. adding the display model number and the optimal screen factor thereof to a screen factor configuration file;
F. and judging whether the client can communicate with the server, if so, automatically uploading the screen factor configuration file to the server, and if not, manually importing the screen factor configuration file to the server.
8. The screen factor adaptation system for a compatible new display device of claim 7, wherein: in the step A, the screen factor configuration file is obtained according to the following steps: judging that the client can communicate with the server; if the screen factor configuration file is not available, the latest screen factor configuration file is manually exported from the server and then is manually imported into the client.
9. The screen factor adaptation system for a compatible new display device of claim 7, wherein: in the step C, a new display image is shot according to the following steps:
s201, adjusting a screen factor to a minimum value, and shooting L images of the front face of a new display;
s202, keeping the screen factor unchanged, and adjusting the shooting angles to obtain N x L images under the screen factor, wherein N is the number of all the shooting angles;
s203, switching the screen factors one by one, and shooting a plurality of images of the new display at a plurality of angles under each screen factor to obtain M images N L images, wherein M is the number of the screen factors which can be taken.
10. The screen factor adaptation system for a compatible new display device of claim 7, wherein: in the step D, the optimal screen factor is obtained according to the following steps:
s410, distributing weight to each shooting angle;
s420, acquiring the evidence obtaining results of the screen factor and 1-5 screen factors after the screen factor is in order for any screen factor, and filling the evidence obtaining results of the last screen factor with insufficient screen factors after the screen factor is in order, wherein the result of successful evidence obtaining is recorded as 1, and the result of failed evidence obtaining or error is recorded as 0;
s430, calculating the weighted sum of the forensics results;
and S440, comparing the weighted sum with a second set threshold value, and if the weighted sum is greater than or equal to the second set threshold value, taking the screen factor as the optimal screen factor of the new display.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111154097.8A CN113901249A (en) | 2021-09-29 | 2021-09-29 | Screen factor adapting method and system compatible with new display equipment |
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| CN202111154097.8A CN113901249A (en) | 2021-09-29 | 2021-09-29 | Screen factor adapting method and system compatible with new display equipment |
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