CN112153453B

CN112153453B - Display system for information safety protection

Info

Publication number: CN112153453B
Application number: CN202011003138.9A
Authority: CN
Inventors: 王鹏
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2023-11-28
Anticipated expiration: 2040-09-22
Also published as: CN112153453A

Abstract

The invention discloses a display system for information safety protection. The system comprises: the display controller is used for controlling the display parameters of the display screen, the display screen display meets the requirement that human eyes observe the display of the picture normally, and the shooting equipment shoots the display screen to obtain a scrambled picture. The system realizes that human eyes can watch normally, and the shooting equipment obtains a scrambled picture when shooting a display screen, and can realize different anti-shooting effects in various modes, thereby being applicable to various application scenes.

Description

Display system for information safety protection

Technical Field

The invention relates to the technical field of display, in particular to a display system for information safety protection.

Background

At present, a large-screen display screen is popularized and applied in some conference rooms and monitoring rooms, but in some application scenes, the content displayed by the display screen is not hoped to be shot and recorded, so that a corresponding technical means is needed to solve the information safety protection function of the display screen display content, namely, when a video camera or a camera shoots and records or photographs the display screen, clear and complete display screen content cannot be obtained, and meanwhile, personnel can be ensured to normally watch the content displayed on the display screen.

Disclosure of Invention

The invention mainly solves the technical problem of providing a display system for information safety protection, which solves the problems that the prior art lacks of information display safety protection for display contents of a display screen, prevents illegal shooting and does not influence normal watching of personnel.

In order to solve the technical problem, the invention provides a display system for information security protection, comprising: the display controller sends display data to the display screen for display, the display controller controls display parameters of the display screen, the display screen display meets the display of a human eye normal observation picture, and the shooting equipment shoots the display screen to obtain a scrambled picture.

Preferably, the display parameters include a refresh rate of the entire screen of the display screen and/or a setting of a direction of the line field scan.

Preferably, the display parameter includes setting a refresh rate of the entire screen of the display screen to a fixed value or dynamically changing within a range of intervals.

Preferably, the display controller controls the applicability adjustment of the frame rate of the displayed video when the refresh rate of the display screen is reduced.

Preferably, the display screen comprises a plurality of display units with identical shape and structure, and the display controller independently sets the refresh rate and/or the line field scanning direction for the partial picture correspondingly displayed by each display unit.

Preferably, the display controller selects and determines the playing time of the display data to be prevented from shooting, and only the refresh rate of the whole screen of the display screen and/or the setting of the line field scanning direction are required in the playing time.

Preferably, the display controller selects and determines a sensitive area of a display picture to be prevented from shooting, and only needs to set a refresh rate of a display unit corresponding to the display screen and/or a direction of line field scanning in the sensitive area.

Preferably, the display controller selects and determines a sensitive area of a display screen to be prevented from being shot, and scrambles the sensitive area to display a locally scrambled screen.

Preferably, the display controller also sets a refresh rate of a display unit corresponding to the display screen and/or a direction of line field scanning for a sensitive area of the display screen to be prevented from photographing.

Preferably, the display screen comprises an LED display array, wherein a first grating strip and a second grating strip are adhered to the LED display array at intervals, the first grating strip and the second grating strip change the vibration directions of light emitted by the LEDs respectively, and the two vibration directions are opposite; the display controller correspondingly displays a first picture to be displayed on all the LED lamp beads correspondingly stuck with the first grating strips, and displays a second picture on all the LED lamp beads correspondingly stuck with the second grating strips, wherein the content displayed by the second picture is used as interference to the first picture, so that the picture integrally displayed by the LED display array is a scrambled picture mixed with the first picture and the second picture; correspondingly, the two lenses of the grating glasses can only receive the first picture corresponding to the LED light penetrating through the first grating strip, and simultaneously shield the second picture corresponding to the LED light of the second grating strip, so that the display content of the first picture is seen through the grating glasses.

The beneficial effects of the invention are as follows: the invention discloses a display system for information safety protection. The system comprises: the display controller is used for controlling the display parameters of the display screen, the display screen display meets the display of the normal observation picture of human eyes, and the shooting equipment shoots the display screen to obtain a scrambled picture. The system realizes that naked eyes can normally watch, and the shooting equipment obtains a scrambled picture when shooting a display screen, and can realize different anti-shooting effects in various modes, thereby being applicable to various application scenes.

Drawings

FIG. 1 is a schematic diagram illustrating the composition of one embodiment of a display system for information security according to the present invention;

FIG. 2 is a graph of display screen refresh cycle versus capture device refresh cycle curve in one embodiment of a display system for information security according to the present invention;

FIG. 3 is a diagram of a display screen displaying captured effects in one embodiment of a display system for information security according to the present invention;

FIG. 4 is a schematic diagram of video frame loss in one embodiment of a display system for information security according to the present invention;

FIG. 5 is a schematic diagram of video frame overlapping in one embodiment of a display system for information security according to the present invention;

FIG. 6 is a schematic diagram of a display screen comprising a plurality of display units and showing each display unit in an embodiment of a display system for information security according to the present invention;

FIG. 7 is an information signature analysis recognition scene graph in one embodiment of a display system for information security protection in accordance with the present invention;

FIG. 8 is a schematic diagram of a sensitive information feature anti-shoot process display in one embodiment of a display system for information security according to the present invention;

FIG. 9 is a block diagram of a display controller in one embodiment of a display system for information security protection in accordance with the present invention;

FIG. 10 is a diagram of a display effect of a sensitive display area in one embodiment of a display system for information security according to the present invention;

FIG. 11 is a schematic diagram illustrating the composition of one embodiment of a display system for information security according to the present invention;

FIG. 12 is a first screen display content panning diagram in an embodiment of a display system for information security protection according to the present invention;

FIG. 13 is a diagram of a first screen and a translated second screen mixed display effect in an embodiment of a display system for information security according to the present invention;

FIG. 14 is a diagram of a mixed word size scrambling display effect in one embodiment of a display system for information security according to the present invention;

FIG. 15 is a diagram of a first screen and a rotated second screen mixed display effect in an embodiment of a display system for information security according to the present invention;

FIG. 16 is a first block diagram illustrating a first block diagram of a display system for information security according to an embodiment of the present invention;

FIG. 17 is a block diagram of a display controller in one embodiment of a display system for information security according to the present invention;

FIG. 18 is a first exemplary segmentation of a display system for information security according to an embodiment of the present invention;

FIG. 19 is a detailed segmentation schematic of the first shaped region of FIG. 17;

FIG. 20 is a flow chart of an embodiment of a display method for information security protection.

Detailed Description

In order that the invention may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

Fig. 1 shows a composition diagram of a display system for information security protection according to the present invention. In fig. 1, the system comprises: a display screen 1, a display controller 2, the display screen 1 comprises an LED display array, in particular a large screen composed of the LED display array. The display controller 2 sends display data to the display screen 1, and the display screen 1 displays, for example, by lighting an LED on the screen and displaying the display data in a display picture form, the viewer 3 can normally watch the picture displayed on the display screen 1 through human eyes, but the picture shot by the shooting device 4 on the display screen 1 is a scrambled picture, where the scrambled picture includes a defective picture, a picture which is not completely displayed, or a picture which is not clearly and completely displayed or is partially displayed, i.e. a shot picture and a video which cannot be clearly, completely and effectively formed, so that visual fatigue is generated due to influence on the visual effect.

Preferably, the display controller controls the display parameters of the display screen, and the shooting device shoots the display screen to obtain the scrambled picture on the premise that the display of the display screen meets the display of the normal observation picture of human eyes. Specifically, the display parameters include setting of the refresh rate of the entire screen, setting of the direction of line field scanning, including horizontal scanning, vertical scanning, oblique scanning, and the like, and setting of the refresh rate and the scanning direction of a portion or a single display unit constituting the entire screen. The display parameters thus include a refresh rate of the entire screen of the display screen and/or a setting of the direction of the line field scan. And preferably the display parameter comprises a refresh rate of the entire screen of the display screen being set to a fixed value or being dynamically varied over an interval.

Further, the refresh rate of the whole display screen is set by the display controller, and the method is suitable for anti-shooting protection of dynamic videos. Preferably, by reducing the refresh rate of the display screen, the display of the image or video will not affect the viewing of the human eye, i.e. the display controller reduces the refresh rate of the display screen and controls the refresh rate to be close to the lower limit of the refresh rate for normal viewing of the human eye. However, for the photographing apparatus, since the frame rate of the photographing apparatus is high or the shutter exposure time is short, that is, the photographing frame rate of the photographing apparatus is greater than the refresh rate of the display screen, the photographing apparatus photographs when the display screen has not completely displayed an image, and thus, a partial image or a defective image is photographed, and thus, the photographing prevention can be effectively performed.

Specifically, when the refresh rate of CCD (charge coupled device) in the photographing device is matched with the refresh rate of the display screen, a clear picture can be shot on the display screen. As shown in fig. 2, the first plot TS1 represents a refresh timing diagram of a display screen, where the corresponding display period intervals are represented by respective display moments T0, T1, T2, T3, etc., and the display period intervals, that is, the inverse of T1-T0, are the refresh rate of the display screen, and each display period interval further includes a time interval Tx1 of line field scanning and a time interval Tx2 of stable display, which are not necessarily equal, and may not be equal. In the time interval Tx1 of the line field scanning, the picture is in a line field scanning state, only the picture content is displayed locally, which is a process of dynamically changing from an incomplete picture to a complete picture, and after the time period is completed, the complete picture of the frame image is displayed, and the picture is displayed in the time interval Tx 2. Further, when the photographing device photographs the display screen, the CCD also has a certain refresh rate, corresponding to the second image line TS2 in fig. 2, where the image period interval corresponding to the photographing device is represented by each time t0, t1, t2, t3, t4, etc., the reciprocal of the photographing period interval t1-t0 is the refresh rate of the photographing device, and the photographing time interval tx1 and the storage time interval tx2 are further included in each photographing period interval, and the photosensitive recognition of the external image is completed in the photographing time interval tx1, which is also a dynamic process from incomplete to complete acquisition of the external image, and the photographed image is stored in the storage time interval tx2, which are not necessarily equal. It can be seen that, on the second graph TS2, the image that starts to be presented at the time T0 in the first graph TS1 cannot be obtained at the time T0 and T1 corresponding to the capturing, because the frames corresponding to the capturing at the time T0 and T1 are partially displayed frames, not complete frames, in the duration of Tx1, and a complete frame can be captured at the time T2. Likewise, on the second graph TS2, there is also correspondence that at times t4, t5, t7, t10, a complete image of one frame can be obtained, and t4 and t5 correspond to the same frame image, and all taken at times t0, t1, t3, t6, t8, t9, t11 are partial images.

Further, the third plot TS3 differs from the second plot TS2 in terms of the phase of time, that is, there is a deviation between the time t0 in the third plot TS3 and the time t0 in the second plot TS2, and when the display screen in the first plot TS1 is photographed at the corresponding time in the third plot TS3, it can be seen that a complete picture can be photographed at the times t1, t4, t6, t7, t9, and a partial picture can be photographed at the other times t0, t2, t3, t5, t8, t 10. Therefore, when comparing the third graph TS3 and the second graph TS2, although the refresh rates of the photographing are the same, there is a difference in the time phases of photographing, which also causes a difference in the distribution of the photographing results in time. Therefore, to photograph a display screen by a photographing device, it is necessary to have a good adaptation of the refresh rate and the time phase of both, which is difficult to do in practice, because the refresh rate of the photographing device is usually fixed or limited to several selectable values, and has a high refresh rate value, which is difficult to adapt to the display screen display with a low refresh rate.

Further, in fig. 2, for the fourth drawing line TS4, the photographing period intervals T0, T1, T2, T3 corresponding to the drawing line are the same as the display period intervals T0, T1, T2, T3 corresponding to the first drawing line TS1, and the selection of the photographing timings T0, T1, T2, T3 is exactly within the time interval Tx2 of stable display in the display period intervals, so that good photographing of the display image can be obtained at this time, and therefore, it is necessary to adapt to the display refresh rate of the display screen in photographing frequency and phase, which is a comparatively ideal effect.

The fourth plot TS4 shows that the shooting refresh rate is equal to the refresh rate of the display screen, and that the shooting under the condition of phase adaptation can obtain a better continuous shooting definition effect. In the case where the refresh rate of photographing displayed in the fifth drawing TS5 is 2 times that of the display screen, but since the time phase is not reasonably selected, the respective times t0, t1, t2, t3, etc. in the fifth drawing TS5 cannot obtain an effectively complete photographed picture, and although the time t2 is within the time interval Tx2 of stable display of the first drawing TS1, since the photographing apparatus is still within the photographing time interval Tx1 from the time t2, since the time to stay within the time interval Tx2 of stable display is short, a good photographing effect cannot be obtained. Under the condition that the shooting refresh rate displayed by the sixth graph TS6 is 2 times of the refresh rate of the display screen, because the time phase selection is reasonable, better shooting effects can be obtained at the moments t1, t3, t5 and t 7.

Through the above description of fig. 2, it can be seen that the refresh rate of the display screen is matched with the refresh rate of the photographing apparatus and the corresponding time phase can perform better photographing on the display effect of the display screen, otherwise, when the refresh rate of the display screen is lower and the refresh rate of the photographing apparatus is very high, the photographing apparatus is difficult to reduce the refresh rate to adapt to the refresh rate of the display screen, and randomness exists in the time phase of photographing, so that the photographing apparatus cannot obtain better photographing effect.

And further, in order to prevent the shooting device from being capable of identifying and tracking the refresh rate of the display screen, and further synchronizing the display of the display screen to shoot, the refresh rate of the display screen can be dynamically adjusted, so that the refresh rate of the display screen is dynamically changed within a range of intervals, and the shooting device is difficult to identify and track.

As shown in fig. 3, this is to obtain a defective shot picture of the display screen by the shooting device, and it can be seen that there are a plurality of black stripes in the shot picture, and these black stripes are generated due to the low refresh rate setting of the whole display screen, and the frame rate of the shooting device for shooting is high, so that the whole display screen does not display the whole image frame in a short shooting time range. However, the picture can be completely seen when the human eyes observe, because the human eyes have visual retention effect, and the response time is not as sensitive and rapid as the shooting equipment.

Preferably, the refresh rate of the display screen is set at 24-30FPS, i.e., 24-30 frames per second, so that when the frame rate of photographing by a photographing device such as a cellular phone is 60FPS, only half of the images displayed on the display screen are generally photographed at the time of photographing. The refresh rate of the display screen may be a fixed value set in 24-30FPS, such as 28FPS, or may be dynamically varied over this range.

Preferably, when the display screen reduces the refresh rate of display, the display controller is required to perform applicability adjustment on the frame rate of the displayed video, that is, to keep the frame rate of the video synchronous and consistent with the refresh rate of the display screen, and to reasonably discard redundant video frames in unit time, so that the continuity of video display can be ensured. Therefore, the display controller controls the applicability adjustment of the frame rate of the displayed video when the refresh rate of the display screen is reduced.

Preferably, the method for reducing the frame rate of the original video when playing the video on the display screen includes the steps of discarding part of frames and reorganizing the video, for example, discarding 1 frame every few frames from an image with 30 frames per second, and reorganizing the rest 25 frames into 1 second video. For example, as shown in fig. 4, 30 frames per second, of which the 5 th, 11 th, 17 th, 23 th, and 29 th frames are extracted and discarded, are no longer present in the newly composed video.

Preferably, the frame rate reduction transformation method may also be that two adjacent frames are subjected to transparent superposition fusion, and the two adjacent frames are subjected to a transition treatment similar to semitransparent, that is, the two adjacent frames are subjected to superposition fusion according to different transparent proportions, and are re-rendered into a new frame of picture, as shown in fig. 5, such as superposition of the 1 st frame and the 2 nd frame. In a sense, no frame is discarded, so that the continuity of the frame can be ensured, but a new problem arises in that the fused frame may generate little ghost, blur, and smear.

Preferably, the frame rate reducing conversion method can also be a slow-down conversion method, and the method is somewhat like slow-down, namely, the original playing of 30 frames per second is changed into playing of 25 frames, but the following 5 frames are not discarded, but are put into the next second, the original video of 1 second is changed into 1 second plus 200 milliseconds, and the audio is correspondingly adjusted because the video of each second is slowed down, so that sound and picture synchronization can be ensured.

Further, as shown in fig. 6, the display screen may be further controlled by dividing the display screen based on the structural composition of the large-screen display screen (such as a large-screen display screen formed by an LED display array), because the large-scale display screen XP1 is generally formed by seamlessly splicing multiple display units XP10 with identical structural composition of multiple shapes, and the display controller may perform independent display control on each display unit XP10, so that the setting of the refresh rate and/or the line field scanning direction on the partial picture correspondingly displayed by each display unit XP10 may be realized independently, and the refresh rate and/or the line field scanning direction of the adjacent display units XP10 may be different, and the two display units at the upper left corner shown in fig. 6 are respectively the display effect differences caused by the different scanning directions. The method is beneficial to improving the effect that when the whole screen is shot by the shooting equipment, the refresh rate of the shooting equipment is unique, and the refresh rates and/or the line field scanning directions of a plurality of display units of the whole screen can be different, so that the scrambling display effects corresponding to the display units are not identical, and the shooting effect after the whole shooting is further reduced. The refresh rate of each display unit may be set to a fixed value different from each other or dynamically changed within one interval.

In this way, the recognition of the refresh rate of the screen by the photographing device can be overcome, because the refresh rate of the whole screen in the above manner is not uniform, but different refresh rates can be provided for different display units, and in particular, the refresh rates of adjacent display units can be set to be obviously different, so that the refresh rate of the recognition screen is difficult to track when the photographing device photographs the whole screen, because different display units or different display areas adopt different refresh rates, the photographing device can synchronize one display unit, but cannot synchronize another display unit, and a complete and effective picture cannot be photographed. Furthermore, the adaptive shooting of the refresh rate of the whole screen cannot be performed, and the shooting effect is necessarily a scrambled picture with defects.

In addition, in this way, the anti-photographing process may be performed only locally, for example, only the display parameters of the individual display units need to be set, and only the display contents of the individual display units have a scrambling effect when photographing. The display screen comprises a plurality of display units which are formed by splicing a plurality of identical shape structures, and the display controller sets the refresh rate and/or the line field scanning direction of the partial picture correspondingly displayed by each display unit.

The above is based on setting the display parameters of the display screen to achieve the purpose of the invention, and in practical application, the display parameters of the display screen can be flexibly set by further combining the display content.

Preferably, when the display content is not required to be prevented from being shot for a long time, only a specific display content is played in a specific time range, the display parameters of the display screen are set as described above in the specific time, and when the display content is not required to be prevented from being shot after the time passes, the conventional display parameters of the display screen are restored. Therefore, the display controller is required to identify and select the playing time and the playing content, so that accurate control is realized in time, and the anti-shooting control is performed on the display screen within a specific time period. For example, when news content is played, if the news content is civil information content, the news content is played normally, and if the news content is military information content, when the military information content is played, the shooting processing method is adopted.

Preferably, when the display content does not need to be prevented from being shot in space for the whole display screen, only when the sensitive area specific to the display content is prevented from being shot, the corresponding display area needs to be identified, and the display parameters of the display unit corresponding to the area need to be set as described above. The display controller selects and determines a sensitive area of a display picture to be prevented from shooting, and only needs to set a refresh rate of a display unit corresponding to a display screen and/or a direction of line field scanning in the sensitive area.

Further, the display controller can identify and analyze the information characteristics of the display content of the picture, wherein the information characteristics refer to the physical information represented by the composition presented in the picture, for example, identify the human body, the human face, the animal type, the article type and the like. As shown in fig. 7, in the picture XR1, a plurality of human bodies are identified, each human body is surrounded by a characteristic area, namely a rectangular frame, and is labeled person, and a plurality of bottles of articles are also identified, and is surrounded by a corresponding rectangular frame, and is labeled letter. In the other picture XD1 a number of animals are identified, each surrounded by a rectangular frame and denoted elethant and zebra, respectively. The display frame and the annotation description can be dynamically tracked along with video playing, and the anti-shooting display processing can be performed on the identified information features in a targeted manner on the basis, so that the anti-shooting display processing can be performed on the sensitive information features in the display content which is concerned only, and other information features are not required to be processed, such as anti-shooting display on a human face only, or anti-shooting display processing can be performed on a computer display interface, text information, a device interface and the like in a picture.

As schematically shown in fig. 8, when a computer display is identified in an image, only anti-shooting display processing is required for content displayed in the display, and other display areas are not processed.

Further, as shown in fig. 9, in implementing information display security prevention shooting, the display controller is mainly based on two aspects, one aspect is to control display parameters of the display screen, which are closely related to the composition (for example, how many display units are included) of the display screen, the structure (for example, the size of the display area, the shape of the display), the display characteristics (for example, the refresh rate, the line field scanning, etc.), and the other aspect is to perform display processing on display data or display contents from a display data source. Such display processing includes conventional processing such as processing of clipping, compressing, etc. of display data so that the display data can be adapted to the display characteristics of the display screen, for example, the display data is high definition data whose frame rate is particularly high, but the frame rate in the display characteristics of the display screen cannot reach such high frame rate, so that a reduction processing of the frame rate is required; for example, the resolution of the input display data is higher, for example 1024×768, and the display screen is 800×600, so that the resolution of the display data needs to be adaptively adjusted to meet the display requirement of the display screen. The display processing also comprises intelligent processing, namely, the display data corresponding to each frame of display picture can be subjected to picture content recognition analysis, such as the recognition analysis of specific people, objects and the like, and the area recognition processing of the sensitive information of the picture is mainly performed by utilizing a convolutional neural network for deep learning and training, so that when the display is performed, shooting can be prevented by performing display control on the display area of the sensitive information corresponding to the display screen, scrambling processing can be directly performed on the picture data of the displayed sensitive information, or both the picture data and the specific objects are synchronously performed, and the information display safety of the sensitive area can be maximally controlled. For example, as shown in fig. 10, the sensitive information MG1 in the screen may be directly subjected to scrambling processing by display processing, which is processing at the image information content level, for example, passivation processing is performed on display data corresponding to the sensitive information to become invisible mosaic effect, or further display parameter control setting as described above is performed on a display screen region corresponding to the sensitive information on the display screen, which is processing at the image signal display level. And both in combination with synchronization. The situation is suitable for directly displaying the live broadcast real-time transmitted picture when live broadcast is displayed, so that the timeliness of watching can be ensured, and the safety of display information can be ensured. Therefore, there is a display controller that performs selection determination of a sensitive area of a display screen to be prevented from photographing, performs scrambling processing on the sensitive area, and displays a locally scrambled screen. The display controller also sets the refresh rate of the display unit corresponding to the display screen and/or the direction of the line field scanning for the sensitive area of the display picture needing to be prevented from shooting.

The display screen is watched based on naked eyes, and the display information safety protection can be further carried out by adding specific observation glasses. Fig. 11 shows a composition diagram of another embodiment of the present invention based on fig. 1. In fig. 11, the system includes: the display screen 1 comprises an LED display array, wherein a first grating strip 11 and a second grating strip 12 are stuck on the LED display array at intervals, the first grating strip 11 and the second grating strip 12 have the effect of changing the vibration direction of light to light emitted by an LED, the change of the vibration direction of the light by the first grating strip 11 and the second grating strip 12 is opposite, or the vibration direction of the light after passing through the first grating strip 11 is the first vibration direction, the vibration direction of the light after passing through the second grating strip 12 is the second vibration direction, and the first vibration direction and the second vibration direction are opposite; the display controller 2 correspondingly displays a first picture to be displayed only on the LED lamp beads correspondingly stuck to the first grating strips 11, and displays a second picture on the LED lamp beads correspondingly stuck to the second grating strips 12, wherein the content displayed by the second picture serves as interference to the first picture, so that the picture integrally displayed by the LED display array is a chaotic picture mixed with a normal picture and an interference picture. Therefore, when the photographing apparatus 4, including various video recording and image photographing apparatuses having photographing and image capturing functions, is used, the whole picture of the photographed LED display array is a scrambled picture which is abnormally displayed, display effects such as incomplete, ghost, screen, disordered text, mosaic, loss of sensitive information hiding, etc. may occur, and thus the photographed video and image cannot be normally viewed and recognized, or important sensitive information is shielded, and the whole screen or sensitive display area loses the definition required by normal display, thereby having the purpose of preventing photographing. Or, the photographed display content is distorted, cannot be recovered and affects the actual look and feel, and causes look and feel fatigue and visual impairment.

Note that fig. 11 only schematically shows the first grating bars 11 and the second grating bars 12, in practical application, the first grating bars 11 and the second grating bars 12 have smaller pitches, so that it is completely possible to display one image by the LED arrays corresponding to all the first grating bars 11, display another image by the LED arrays corresponding to all the second grating bars 12, and the two images are displayed on the display screen 1 simultaneously by dividing the display screen 1 into two staggered and overlapped display arrays, which respectively occupy half of the display screen 1.

Correspondingly, the two lenses of the grating glasses 3 can only receive the first picture display content corresponding to the LED light penetrating through the first grating strip 11, and shield the second picture interference content corresponding to the LED light of the second grating strip 12, so that the normal first picture display content is seen through the glasses. That is, the light in the first vibration direction generated after the light is filtered by the first grating bar, both lenses can pass the light in the first vibration direction, and the light in the second vibration direction generated after the light is filtered by the second grating bar, neither lens can pass the light in the second vibration direction.

In fact, the light-transmitting film having the same vibration direction as the first grating bar 11 is correspondingly provided for the two lenses of the grating glasses 3, so that the light in the first vibration direction can be transmitted through the two lenses, and the light in the second vibration direction is prevented from being transmitted through the two lenses.

It can be seen that the normal picture passes through the first grating bars 11, and then the first picture, i.e. the normal picture, can be observed through the grating glasses 3, while the second picture, i.e. the interference picture, passes through the second grating bars 12, and then the interference picture cannot be observed through the grating glasses 3, so that a person wearing the grating glasses 3 can see the normal picture clearly. In contrast, with the photographing apparatus 4, since the photographing is performed with the lens directly against the display screen 1, the display screen 1 displays a mixed picture of the normal picture and the disturbing picture, which is a confusing picture as a whole, the normal picture cannot be obtained, the photographing preventing effect is provided, or the photographed picture has no visual value.

Preferably, the first grating bars 11 and the second grating bars 12 shown in fig. 11 are arranged at horizontal intervals, for example, the first grating bars 11 are adhered to the surfaces of the first row of LED lamp beads, the second grating bars 12 are adhered to the surfaces of the adjacent second row of LED lamp beads, the first grating bars 11 are adhered to the surfaces of the third row of LED lamp beads, the second grating bars 12 are adhered to the surfaces of the adjacent fourth row of LED lamp beads, and so on.

Preferably, the first grating strips 11 and the second grating strips 12 are vertically arranged at intervals, that is, the first grating strips 11 are adhered to the surfaces of the first row of LED lamp beads, the second grating strips 12 are adhered to the surfaces of the adjacent second row of LED lamp beads, the first grating strips 11 are adhered to the surfaces of the third row of LED lamp beads, the second grating strips 12 are adhered to the surfaces of the adjacent fourth row of LED lamp beads, and so on. Thus, the content of the first screen is displayed by the plurality of rows of LED beads to which the first grating bars 11 are attached, and the content of the second screen is displayed by the plurality of rows of LED beads to which the second grating bars 12 are attached. The mode can also realize the mixing of the interference picture and the normal picture, thereby achieving the purpose of preventing the shooting of the shooting equipment and simultaneously realizing normal watching through the grating glasses 3.

Preferably, in practical application, the display content of the second picture has a correlation with the display content of the first picture, and the display content of the second picture can be generated after the display content in the first picture is rearranged and combined after the display content is disordered.

Preferably, for the display content of the first picture, the display content is represented in a matrix form, and when in display, each corresponding LED lamp in the array formed by the first raster stripes of the LEDs can be considered as a corresponding LED, and the display data corresponding to each position in the matrix is correspondingly displayed. First picture HM ₁ The display content is as follows:

wherein h is ₁ l ₁ In the LED display array with the first grating strips adhered therein, the content displayed by the 1 st row and 1 st column pixels is represented by h ₁ l ₂ Representing the content of the row 1, column 2 pixel display, and so on, for a total of M rows and N columns.

Preferably, the display content of the second screen is obtained by shifting the display content of the first screen, specifically, by shifting the display content of the first screen HM ₁ The display content is: the up-and-down circular translation between the rows, the left-and-right circular translation between the columns, and the translation between the rows and the columns are all implemented to realize the second picture HM ₂ And generating display content.

For example, by shifting 1 line in the up-down cycle, the generated second picture HM ₂ The display content is as follows:

for example, by circularly shifting left and right columns by 1 column, the generated second picture HM ₂ The display content is as follows:

for example, the second screen HM is generated by shifting 1 row in the up-down cycle and shifting 1 column in the left-right cycle ₂ The display content is as follows:

as can be seen from the above embodiments, the second screen content is formed by rearranging and combining the first screen content, this processing is based on the overall processing effect of the display content of the entire display screen, as shown in fig. 12, for example, for the first screen RT1, which is equivalent to dividing the screen into two parts, that is, the upper half is the content 1 and the lower half is the content 2, the exchange of the upper and lower two parts can be achieved by the up-down translation transformation, so as to form the display content of the second screen RT2, that is, the upper half is the content 2 and the lower half is the content 1, and then the display content of the second screen RT2 and the display content of the first screen RT1 are displayed on the same display screen on the display array corresponding to the second grating 12 and the display array corresponding to the first grating 11, respectively, so as to form an interference mixed display of the overall display; for another example, the first screen RT3 is divided into two parts, namely, the left half part is the content 1 and the right half part is the content 2, and the left and right shift conversion can realize the exchange of the left and right parts, so as to form the display content of the second screen RT4, namely, the left half part is the content 2 and the right half part is the content 1; in the case of, for example, performing a panning exchange between the upper and lower portions of the first screen RT5 and then performing a panning exchange between the left and right portions, thereby forming the display content of the second screen RT6, it can be seen that the combined panning of these two modes corresponds to a panning exchange between the display content divided into 4 display content areas, i.e., content 1 to content 4, of the first screen and then performing a panning exchange between the display content of these 4 areas.

Preferably, the horizontal shift amount and the vertical shift amount can be flexibly selected and set according to the requirement, and the horizontal shift amount corresponds to one half of the number of display matrix columns of the whole display screen in the description of fig. 12, and the vertical shift amount corresponds to one half of the number of display matrix columns of the whole display screen. As shown in fig. 13, the mixing effect after shifting a plurality of columns left and right, one half of the number of columns of the display matrix is not selected as the shift amount, but only for the purpose of schematically showing the mixing effect after shifting, it can be seen that a significant ghost interference effect has been generated.

Preferably, for the text symbol, a certain interference effect can be generated through the translation, and even an optimal interference effect which is difficult to identify can occur. In this regard, as shown in fig. 14, in which the normal display text in the mixed display text content of the first line XS1 is "learn well and upwards on the day", the interference text selected in the first line is "learn well and upwards on the day" after being shifted in half from left to right, so that it can be seen that there is a better interference effect, but the effect of the superimposed "learning" and "upwards" can be still distinguished. The mixed display text content of the second line XS2 is that two lines are identical and are just staggered and shifted downwards and rightwards, and then mixed and overlapped, so that the interference effect is bad, and the effect that the text is difficult to distinguish is not generated. The third line XS3 is a result of displaying the mixture of the word "top" and the interference word "you'll's mei wen" on the day, where no translation method is used to generate the interference picture, but it can be seen that the third line XS3 has better interference effect than the two lines above, because the third line finds a structure similar to the word (for example, "good" and "you" are both right and left structures), a stroke similar to the word (for example, "good" and "you" are both vertical skimming, and the right is both vertical hooked strokes), and how many strokes are also similar, for example, "up" corresponds to "down", "down" corresponds to "question", "day" corresponds to "beauty", "learn" corresponds to "hall", "learning" corresponds to "shi". The displayed text in the fourth line XS4 is "image quick", the corresponding disturbing text is "4oujop pvjohtv", and it can be seen that the disturbing effect is also better, because we also find a similar disturbing letter or number for each letter displayed, e.g. "a" corresponds to "4", "d" corresponds to "o", etc. Therefore, similar interference words must be found for the displayed word correspondence, so that the best interference effect can be achieved, and the interference effect is more obvious than that achieved by the above-mentioned translation, which belongs to the highly targeted display content-based matching interference, which will be further described later.

The above is mainly based on panning of the display content of the first screen to generate the display content of the second screen. Preferably, the display content of the second picture is obtained by rotating the display content of the first picture, that is, the display content of the first picture is rotated to generate the display content of the second picture, and the rotation angle can be set according to the interference effect. For example, the first picture HM ₁ The display content is as follows:

after anticlockwise rotation by 45 degrees, the generated second picture HM ₂ The display content is as follows:

further, as shown in fig. 15, the first frame YT0 is rotated 10 degrees counterclockwise to obtain a second frame, and then mixed with the first frame YT0 to obtain an interference frame JR1; the first picture YT0 is rotated anticlockwise for 20 degrees to obtain a second picture, and then the second picture is mixed with the first picture YT0 to obtain an interference picture JR2; the first picture YT0 is rotated 90 degrees anticlockwise to obtain a second picture, and then the second picture is mixed with the first picture YT0 to obtain an interference picture JR9. From the interference effect, the interference frame JR1 can also distinguish the main blade of the windmill in the first frame YT0, the interference frame JR2 has difficulty in distinguishing the main blade of the windmill in the first frame YT0, and the interference frame JR3 has not been able to distinguish the main blade of the windmill in the first frame YT0 at all. It can be seen that the interference effect is closely related to the composition structure and rotation angle of the displayed image, because the windmill in this example is a circular structure, and the mixing and overlapping interference can generate a more ideal interference effect by rotating the image, and if the color can be displayed, the interference effect is more obvious.

It is further preferred that the above-mentioned translation and rotation processes are actually rearranged and combined with the display content of the first screen, and these two processes may also be used in combination, for example, translation and rotation processes are performed first. The translation and rotation processing can rearrange the display content of the first picture in a mathematical calculation mode, and the method has certain calculability and has the advantages of high processing speed and simple implementation mode.

Preferably, the display content of the second picture is obtained by randomly combining the display content of the first picture, namely, the display content of the first picture is randomly arranged and combined, and the display content of the first picture after being disturbed is randomly combined into the display content of the second picture.

Further, the translation, rotation, and random combination processing methods described above may be used in combination. In addition, the above is performed based on the whole screen of the first screen, and the whole screen of the first screen may be further subjected to region division, which is independent of the screen display content, that is, the division of the first screen into a plurality of sub-screens or sub-areas is equivalent, as shown in fig. 16, the first screen HT1 is divided into a first sub-screen HT11 and a second sub-screen HT12, and it can be seen that the first sub-screen HT11 is located in the central area of the first screen HT1, which is the main area of the display screen, and the second sub-screen HT12 is located in the peripheral area of the first sub-screen HT 11. The above-described translation, rotation, or/and random combination processing method may be performed on these different sub-frames in the first frame, respectively, in the process of generating the second frame. For example, the rotation process is performed for the first sub-picture HT11 located in the center area, and the translation process is performed for the second sub-picture HT12 located in the peripheral area. By the method, the first picture can be further refined, and the problems that the whole picture cannot cover some local areas or has poor effect when the whole picture is subjected to the translation, rotation and random combination processing are solved.

Further, as shown in fig. 6, the sub-frame distinction can be performed on the first frame based on the structural composition of the display screen, because the large-sized display screen XP1 is generally formed by seamlessly splicing multiple display units XP10 with identical structural compositions of multiple pieces, and the display controller can perform independent display control on each display unit XP10, so that the above-mentioned processing methods of translation, rotation, random combination and the like can be performed on the first partial frame corresponding to each display unit XP10, so as to generate the second partial frame corresponding to the display unit XP10, and then mix the first partial frame and the second partial frame into the partial mixed interference frame corresponding to the display unit XP 10. The method is beneficial to improving the granularity of interference display of the whole screen, enhancing the interference effect, solving the problem that omission or local poor interference effect possibly occurs during the whole screen processing, and therefore, the local interference processing can be carried out, for example, only the display content of the position of the individual display unit is required to be subjected to interference display.

Further, as shown in fig. 17, the internal composition of the display controller 2 in fig. 1 is shown, and it can be seen that the display controller includes a CPU module, a first screen display processing module, a first screen display control module, a second screen display processing module, and a second screen display control module. The display data source is data such as an image and a video to be displayed, and the first picture display processing module performs an adaptation process on the display data from the display data source, so that the display data meets the specification of the LED display screen, for example, the display data source pixels are 1028×764, and the display specification of the LED display screen is 800×600, so that the display data of the display data source needs to be subjected to a resolution reduction process, and the display data meets the display specification of the LED display screen. The first picture display control module is used for correspondingly controlling and distributing the display data from the first picture display processing module to the LED display arrays corresponding to the first grating strips in the LED display screen, and controlling the corresponding display physical parameters such as frame frequency, brightness, data rate and the like, so that the LED display arrays corresponding to the first grating strips can normally display the content of the first picture. The first picture display control module correspondingly processes the display data from the first picture display processing module in the translation, rotation, random combination and the like to generate corresponding second picture display data, and the second picture display control module then distributes the display data to the LED display arrays corresponding to the second grating strips in the LED display screen in a control manner, and controls corresponding display physical parameters such as frame frequency, brightness, data rate and the like, so that the LED display arrays corresponding to the second grating strips can display the content of the second picture synchronously and normally with the first picture. The CPU module realizes the control of the modules.

Further, when the display screen displays the dynamic video, the image frame displayed by the second picture is the image frame of the first picture after time delay. That is, when the display data source is a dynamic video, the second image display processing module processes the display data from the first image display processing module, and further includes performing delay buffer processing on the image frames, and mixing the delayed image frames as second image content output with the current frame image content of the first image, for example, the image frames currently output by the first image display processing module are ZX3, before which there are already image frames ZX2 and ZX1 output, and the second image display processing module performs delay two image frame processing, at this time, the second image display processing module outputs the image frame ZX1, so that the display content of the image frame ZX1 is used as second image display content, and is displayed in a mixed manner with the display content of the image frame ZX3 displayed on the first image. In this way, the second image display processing module only needs to perform delay output, and the aforesaid various translation and rotation processing processes are not needed, so that the processing speed is faster and more timely. Naturally, the above-described translation and rotation processing may be further combined, that is, the delayed frame may be further translated and rotated and then outputted as the second screen.

The technical means is mainly that the protection processing is carried out on the signal processing level, the generation of the second picture is closely related to the generation of the first picture, and the second picture is generated after the display signals of the first picture are spatially redistributed through the display controller. In order to realize better display safety protection, the following modes of display, such as static display (graphic display) and dynamic display (video display), and the content of the displayed information, can be further combined, the first picture is subjected to information-level identification analysis, and then scrambling processing is performed in a targeted manner for sensitive information in the first picture.

Preferably, after receiving the display data from the first screen display processing module, the second screen display processing module in the display controller performs display morphology analysis, that is, distinguishes whether it is a still image or a dynamic video, where the still image is the same image displayed within a certain time range, for example, within seconds or minutes, where the situation often occurs when the courseware content is played in the lecture. Dynamic video is to play different image frames according to a certain frame frequency, so as to present continuous video motion, which is often the case when playing general video. The display morphological analysis is favorable for generating the second pictures in a targeted way, preferably, a plurality of different second pictures can be generated in different time periods for the static image serving as the first picture during the presentation of the static image, and the second pictures are respectively mixed with the first picture for playing, so that the condition that the mixing interference effect of individual second pictures is not ideal and can be used for a long time can be reduced. Preferably, when each frame of image is required to be used as the first picture for the dynamic video, the second picture is correspondingly generated, and the second picture display processing module is required to have high processing speed to meet the requirement of rapidly generating the second picture. In addition, in the case of a dynamic video, it is also necessary to specifically consider the coordination between the frame rate of the video and the refresh rate of the display screen, and the effect of preventing photographing can be achieved by reducing the refresh rate of the display screen, which will be further described later.

Further, the second image display processing module can perform recognition analysis on the optical characteristics of the display content of the first image, where the optical characteristics refer to optical characteristic parameters such as color, brightness and the like corresponding to each display pixel. For example, the first screen YT0 in fig. 15 is a color windmill, which is rich in color and bright in display, and the background on both sides of the windmill is single dark black, which is single in color and dark in display. Therefore, by identifying and analyzing the optical characteristics of the display content of the first screen, the boundary contour of the windmill can be identified according to the color and brightness parameters of the pixels, so that the shaped area corresponding to the windmill is an area formed by the peripheral contour of the windmill, the inside of the area is the windmill screen, and the outside of the area is the background area. After the two corresponding display content areas are identified, the two display content areas can be respectively processed, for example, the windmill display areas are rotated to form display contents of the windmill area corresponding to the second picture, the background display areas are translated to form display contents of the background area corresponding to the second picture, the generated second picture is corresponding to the display contents of the two areas after addition and synthesis, and therefore, better scrambling protection effect can be obtained when the generated second picture is mixed with the first picture.

In this regard, as further described with reference to fig. 17, as shown in fig. 18, in which the first screen ZC0 is one frame of image in a still screen or a moving video which is normally displayed, it can be seen that the first screen ZC0 is divided into 6 shaped display areas, corresponding to AX1, AX2, AX3, AX4, AX5, AX6, which are mainly recognized based on the aforementioned difference in optical characteristics. After the 6 shaped areas are divided, the above-mentioned combination processing of translation, rotation and random may be performed for each shaped area, and the display contents of the shaped display areas BX1, BX2, BX3, BX4, BX5, BX6 are correspondingly obtained, and then further combined into the second screen GR0.

Preferably, for each frame of image in the first frame being a still frame or a moving video, when the second frame, i.e., the interfering frame or the interfering frame image is generated, the display regions of different pixel sizes may be divided, for example, the region with color close to each other is divided as an independent region, or the region with no change in consecutive frames in the video is taken as a background region, and the region with change is taken as a foreground region. After such display area division, the same display area is associated with an interference display area in a second screen that interferes with the display area in the first screen, mainly by using elements such as color and composition in the present display area. Such area division is mainly based on the difference in screen contents such as color and composition.

Preferably, the scrambling anti-shooting process is performed on the background area and the foreground area in the video respectively, and the background area is the same in a plurality of continuous video frames, so that the background area is displayed by adopting the same interference display content, and when the display controller performs display control, the display controller uses the same background interference content to display in a plurality of continuous video frames, and the background extraction and scrambling process are not required to be performed on each frame of video image independently, so that the workload of the display controller is reduced. And for the foreground region, the foreground region can be processed in a targeted manner according to the change amount in the front frame image and the back frame image. Preferably, if the change of the foreground region is a slow gradual change process, the foreground region with slow change of continuous frames of images is selected to be displayed in a scrambling mode by using the interference display content corresponding to the same foreground region, and then after a plurality of frames are separated, another new interference display content corresponding to the foreground region is selected to be displayed in a scrambling mode on the next foreground region with slow change of continuous frames of images. Preferably, if the change of the foreground region is a continuous and obvious change process, the corresponding interference display content is determined for the foreground region in each image frame separately, and then the second image frame is added to the corresponding interference display content when the display screen displays the corresponding interference display content.

Preferably, for each frame of image in the static image or the dynamic video, when the interference image or the interference frame image in the second image is generated, a large number of inputted images can be learned and trained through a network with a learning function formed by a convolutional neural network, so that an identification network with artificial intelligence characteristics is formed, then the corresponding interference image or the interference frame image in the second image can be automatically generated for the newly inputted first image, namely, the static image and each frame of image, and then the display controller respectively controls the LED lamps where the first grating strips 11 are positioned to display the first image and simultaneously controls the LED lamps where the first grating strips 12 are positioned to display the second image.

Here, the region division in fig. 18 is based on one frame of image in one normally displayed still picture or moving video, and is based on the region division result after the recognition analysis of the optical characteristics of the image. When the images are changed, the division can be specifically identified according to the different images. Unlike the division method of the embodiment shown in fig. 7, the division method of fig. 7 is applicable to each image frame because the processing method in fig. 7 is not divided based on recognition of image features or image contents, but is merely physical division of a display area, but the processing speed of the example shown in fig. 7 is more advantageous and the implementation method is simple and easy.

Preferably, each of the shaping regions may be further subdivided into a plurality of sub-regions, and as shown in fig. 19, the shaping display region AX1 in fig. 18 is further subdivided into sub-regions AX11, AX12, AX13, AX14, AX15, and then the sub-region AX11 is translated up and down, the sub-region AX12 is translated left and right, the sub-region AX13 is translated left and right, and the sub-regions AX14 and AX15 are symmetrically translated about respective symmetry axes. The shaped display area BX1 is thus generated correspondingly. Through the further sub-region division and translation processing, region division with smaller granularity can be realized, thereby being beneficial to realizing scrambling processing with more refinement.

Further preferably, the second screen display processing module is capable of identifying and analyzing information features of the display content of the first screen, where the information features refer to physical information represented by a composition presented in the screen, for example, identifying a human body, a human face, an animal type, an article type, and the like. As shown in fig. 7, a plurality of human bodies are identified in the first picture XR1, and each human body is surrounded by a feature area, namely a rectangular frame, and is labeled person, and a plurality of object bottles are also identified, and is surrounded by a corresponding rectangular frame, and is labeled bottle. In the other first picture XD1 a plurality of animals are identified, each surrounded by a rectangular frame and denoted elethant and zebra, respectively. The display frame and the labeling description can be dynamically tracked along with video playing, scrambling processing is carried out on the identified information features in a targeted mode, scrambling processing is carried out on the information features which are concerned only, other information features are not needed to be processed, for example, scrambling processing is carried out on faces only, or scrambling processing is carried out on a computer display interface, text information, a device interface and the like in a picture, the scrambling processing can be directly carried out on a first picture, or after the sensitive information features which are concerned are identified from the first picture, the corresponding interference display content in a second picture is generated only by processing the sensitive information features, the second picture is displayed only on a display area of the information features, and interference display is not carried out on other areas.

It is further preferred that the foregoing description of scrambling the third and fourth lines XS3, XS4 literal symbols in fig. 14 be incorporated. When character symbols are displayed by the identification analysis of the information features of the display content of the first picture, besides the translation and rotation processing method, the display content of the second picture can be pertinently interfered by similar interference characters, or the display content of the second picture is not derived from the first picture, but the interference content of the corresponding display area of the second picture can be pertinently generated according to the identification of the information features in the first picture. For example, the Chinese character "good" corresponds to "you", "up" corresponds to "down", "down" corresponds to "question", "day" corresponds to "beauty", "learn" corresponds to "hall", "learn" corresponds to "shi". When specific characters are identified on the first picture, the similar characters corresponding to the characters are directly called from the corresponding similar database and used as interference characters of the corresponding display area of the second picture.

Preferably, the display controller identifies the face in each frame of image in the static image or the dynamic video, when scrambling anti-shooting processing is required to be carried out on the face area, the face features can be identified, including identification judgment on facial types, hairstyles, skin colors and facial features, then interference features corresponding to each facial feature are found on the basis, and then the interference features are combined, so that obvious interference can be generated on normal faces when the interference features are combined, for example, skin colors are close, namely, black and white of skin are close correspondingly. The human face with higher similarity with the normal human face in the first picture can be found from the database to be used as the interference human face in the second picture, and the interference human face in the second picture can be realized by performing simulation reconstruction on the basis of the normal human face in the first picture. Then, the display controller controls the normal face in the first picture to be displayed through the LED lamp where the first grating strip 11 is located, and simultaneously controls the interference face in the second picture to be displayed through the LED lamp where the first grating strip 12 is located.

Preferably, when displaying characters in a dynamic video mode, for example, caption content displayed in the video, the display controller can also directly identify the display area of the caption, and then the characters in the dynamic video are directly subjected to blurring processing by directly carrying out blurring processing on the characters in the character display area or the caption display area corresponding to each frame of image, so that the purpose of preventing shooting is directly achieved.

It can be seen that the processing of the first frame further includes recognition analysis based on the optical features and the information features in the frame, the recognition analysis can be based on deep learning by using a neural network to construct a recognition model, and the recognition model can change recognition objects through training of a training set, such as recognizing specific objects of a human face, recognizing a computer display screen and the like, so that the recognition model has obvious characteristics of artificial intelligence. Therefore, the key objects and the areas where the key objects are required to be protected can be identified, then the interference data is further generated, the interference data can be obtained from the interference data in the second picture after the corresponding part of the first picture is processed, or the interference data in the second picture can be generated in a targeted mode by constructing an interference database (such as interference on characters) and simulating and synthesizing the interference data (such as interference on faces and mosaic processing) after the information features are identified, so that the interference or protection effect is better.

In addition, it should be emphasized that the foregoing method has no display effect on the first screen, the display content of the first screen can be clearly seen through the glasses, and when the mixed content displayed on the whole display screen is photographed by the image capturing device, an interference screen will be obtained. Of course, if there is a higher level of information security requirement, scrambling may be performed on the specific information features in the first frame, so that the first frame may also be partially displayed as interference features, such as a face, characters, a computer display interface, and the like.

It can be seen that the present invention discloses a display system for information security. The system comprises: the display controller is used for controlling the display parameters of the display screen, the display screen display meets the display of the normal observation picture of human eyes, and the shooting equipment shoots the display screen to obtain a scrambled picture. The system realizes that naked eyes can normally watch, and the shooting equipment obtains a scrambled picture when shooting a display screen, and can realize different anti-shooting effects in various modes, thereby being applicable to various application scenes.

Based on the embodiment of the display system for information security protection, the invention provides an embodiment of a large-screen display method for information security protection.

FIG. 20 is a flow chart of an embodiment of a display method for information security protection according to the present invention, comprising the steps of:

a display presentation S10, wherein display data is sent to a display screen by using a display controller, and the display screen lights LEDs on the screen and displays the LEDs in a display picture mode;

and S20, safety control is carried out, the display controller is used for controlling the display parameters of the display screen, so that the display of the display screen meets the display of the normal observation picture of human eyes, and the shooting equipment shoots the scrambled picture obtained by shooting the display screen.

The method realizes that naked eyes can normally watch, and when the shooting equipment shoots the display screen, the scrambled picture is obtained, so that a better shooting prevention effect is realized, and the method is suitable for various application scenes.

Preferably, in step S20, the controlling the display parameter of the display screen using the display controller includes setting a refresh rate of the entire screen of the display screen and/or a display parameter of a direction of line field scanning.

Preferably, in step S20, the refresh rate of the display screen is reduced by the display controller, so that the refresh rate of the display screen is close to the lower limit of the refresh rate of normal viewing by human eyes.

Preferably, in the step of safety control S20, when the display controller controls to reduce the refresh rate of the display screen, frame rate reduction conversion is performed on the frame rate of the displayed video, so that the frame rate of the video is synchronous and consistent with the refresh rate of the display screen; the frame rate reduction transformation method comprises the steps of discarding part of frames, recombining videos, and performing transparent superposition fusion and speed reduction transformation on two adjacent frames.

Preferably, in step S20, the display screen includes a plurality of display units with identical shape and structure, and the display controller performs refresh rate and/or line field scanning direction setting on the partial picture displayed by each display unit.

Preferably, in the step security control S20, a display controller is used to selectively determine a play time of the display data to be prevented from being photographed, and in the play time, a refresh rate of the whole screen of the display screen and/or a setting of a direction of line field scanning are/is set.

Preferably, in the step of safety control S20, a display controller is used to select and determine a sensitive area of a display screen to be prevented from being shot, and only the refresh rate of a display unit corresponding to the display screen and/or the setting of the direction of line field scanning need to be set in the sensitive area.

Preferably, in the step security control S20, a display controller is used to select and determine a sensitive area of a display screen to be prevented from being photographed, and a scrambling process is performed on the sensitive area to display a locally scrambled screen.

Preferably, the display screen comprises an LED display array, wherein a first grating strip and a second grating strip are adhered to the LED display array at intervals, the first grating strip and the second grating strip change the vibration directions of light emitted by the LEDs respectively, and the two vibration directions are opposite; displaying a first picture to be displayed on all the LED lamp beads correspondingly stuck with the first grating strips correspondingly, displaying a second picture on all the LED lamp beads correspondingly stuck with the second grating strips, wherein the content displayed by the second picture is used as interference to the first picture, so that the picture integrally displayed by the LED display array is a scrambled picture mixed with the first picture and the second picture; and shielding a second picture corresponding to the LED light of the second grating strip by using grating glasses, so that the display content of the first picture is seen through the grating glasses.

Based on the same concept, the specific embodiments of the above method may be further described with reference to the foregoing display system, which is not described herein again.

The method can enable the display screen to display images meeting the normal observation of human eyes, and the shooting equipment shoots the display screen to obtain scrambled images. The method has the advantages that naked eyes can normally watch, the scrambling picture is obtained when the shooting equipment shoots the display screen, and various different anti-shooting effects can be realized in various modes, so that the method is suitable for various application scenes.

The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the present invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present invention.

Claims

1. A display system for information security protection, the system comprising: the display controller is used for controlling the display parameters of the display screen, the display of the display screen meets the display of a normal observation picture of human eyes, and the shooting equipment shoots the display screen to obtain a scrambled picture;

the scrambling picture comprises a picture with incomplete, a picture with incomplete display, and a picture with unclear or fuzzy overall display or partial display; the shooting frame frequency of the shooting equipment is larger than the refreshing rate of the display screen;

Or the display screen comprises an LED display array, wherein a first grating strip and a second grating strip are adhered to the LED display array at intervals, the first grating strip and the second grating strip respectively change the vibration directions of light emitted by the LEDs, and the two vibration directions after the change are opposite; the display controller correspondingly displays a first picture to be displayed on all the LED lamp beads correspondingly stuck with the first grating strips, and displays a second picture on all the LED lamp beads correspondingly stuck with the second grating strips, wherein the content displayed by the second picture is used as interference to the first picture, so that the picture integrally displayed by the LED display array is a scrambled picture mixed with the first picture and the second picture; correspondingly, the two lenses of the grating glasses can only receive the first picture corresponding to the LED light penetrating through the first grating strip, and simultaneously shield the second picture corresponding to the LED light of the second grating strip, so that the display content of the first picture is seen through the grating glasses.

2. A display system for information security as claimed in claim 1, characterized in that the display parameters comprise a refresh rate of the entire screen of the display screen and/or a setting of the direction of the line field scan.

3. The display system for information security according to claim 1, wherein the display parameters include a refresh rate of the entire screen of the display screen being set to a fixed value or being dynamically changed within a range of intervals.

4. A display system for information security as claimed in claim 2 or 3, wherein the display controller is adapted to adjust the frame rate of the displayed video when controlling to reduce the refresh rate of the display screen.

5. The display system for information security protection according to claim 1, wherein the display screen comprises a plurality of display units which are formed by splicing a plurality of pieces of display units and have the same shape and structure, and the display controller independently sets a refresh rate and/or a line field scanning direction for a partial picture which is correspondingly displayed by each display unit.

6. The display system for information security protection according to claim 1, wherein the display controller selectively determines a play time of the display data to be prevented from being photographed, and only sets a refresh rate and/or a line field scanning direction of an entire screen of the display screen or sets a refresh rate and/or a line field scanning direction of a partial picture displayed correspondingly by an individual display unit of the display screen independently during the play time.

7. The display system for information security protection according to claim 1, wherein the display controller makes a selection determination on a sensitive area of a display screen to be prevented from being photographed, and only a refresh rate of a display unit corresponding to the display screen and/or a setting of a direction of line field scanning are required in the sensitive area.

8. The display system for information security according to claim 1, wherein the display controller performs selection determination of a sensitive area of a display screen to be prevented from being photographed, performs scrambling processing on the sensitive area, and displays a locally scrambled screen.

9. The display system for information security according to claim 8, wherein the display controller further prevents setting of refresh rate of display unit corresponding to the display screen and/or direction of line field scanning, as required, of a sensitive area of the photographed display screen.