CN110426941B - Peep-proof method and device for holographic projection image - Google Patents

Peep-proof method and device for holographic projection image Download PDF

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Publication number
CN110426941B
CN110426941B CN201910729848.0A CN201910729848A CN110426941B CN 110426941 B CN110426941 B CN 110426941B CN 201910729848 A CN201910729848 A CN 201910729848A CN 110426941 B CN110426941 B CN 110426941B
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adjustment
angle
projection image
holographic projection
distance
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CN110426941A (en
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王鑫
赵友军
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China United Network Communications Group Co Ltd
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China United Network Communications Group Co Ltd
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2286—Particular reconstruction light ; Beam properties
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G09G3/003—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to produce spatial visual effects
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H2001/2223—Particular relationship between light source, hologram and observer

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Holo Graphy (AREA)

Abstract

The invention discloses a peep-proof method and a device for holographic projection images, wherein the method comprises the following steps: calculating to obtain a coarse adjustment distance of the second equipment according to the parameters of the holographic projection image, and sending the coarse adjustment distance to the second equipment; responding to a distance adjustment confirmation message returned by the second equipment, and calculating and obtaining a fine adjustment angle and illumination adjustment intensity of the interference light according to parameters of the holographic projection image; and transmitting interference light with illumination adjustment intensity to the second equipment, and simultaneously, transmitting an angle adjustment message to the second equipment, wherein the angle adjustment message comprises a fine adjustment angle, so that the second equipment adjusts the direction of the interference light according to the fine adjustment angle. The distance is coarsely adjusted to the second equipment, so that the second equipment can prompt a user to adjust the position of the second equipment, interference light with illumination adjustment intensity is emitted to the second equipment, the second equipment is informed to adjust the direction of the interference light by the fine adjustment angle, the interference light can interfere the sight of an observer, the peeping prevention effect is achieved, and the privacy of user information is guaranteed.

Description

Peep-proof method and device for holographic projection image
Technical Field
The invention relates to the technical field of holographic and projection display, in particular to a peep-proof method and device for a holographic projection image.
Background
Holographic projection is a technology of stereo imaging in air, and is different from plane screen projection, which only shows stereoscopic impression on a two-dimensional surface through perspective, shadow and the like, and the holographic projection technology is a real 3D image, and different sides of the image can be viewed from any angle of 360 degrees. It is usually a four-dimensional cone made of transparent material, from which a light source is projected by a bottom projection source, through which the viewer's line of sight can penetrate from either side, and from which the viewer can see a free-floating image by the principle of surface reflection. The 360-degree holographic projection image is more and more favored by users due to the good projection effect.
At present, the holographic projection technology is applied to mobile terminal equipment to realize video call. For example, a stereoscopic projection of an end user is presented to the user outside the mobile terminal through holographic projection technology. However, when the video call is performed, the content of the call has certain privacy, and if the content is displayed by adopting the holographic projection technology, irrelevant people can easily see the projected privacy information, so that other irrelevant people can detect the image of the holographic video, and further the privacy of the video call cannot be ensured, and the leakage of client information is caused.
Disclosure of Invention
Therefore, the invention provides a peep-proof method and device for a holographic projection image, and aims to solve the problem that in the prior art, private information of a client is leaked due to the fact that the content of a video call or stereoscopic projection information of an opposite-end user is displayed by adopting a holographic projection technology. The invention aims to solve the problems that: how to ensure the privacy of the video call when the holographic projection technology is adopted to show the content of the video call or the stereo projection information of the opposite-end user.
In order to achieve the above object, a first aspect of the present invention provides a peeping prevention method for a holographically projected image, the method comprising: calculating to obtain a coarse adjustment distance of the second equipment according to the parameters of the holographic projection image, and sending the coarse adjustment distance to the second equipment; responding to a distance adjustment confirmation message returned by the second equipment, and calculating and obtaining a fine adjustment angle and illumination adjustment intensity of the interference light according to parameters of the holographic projection image; and transmitting interference light with illumination adjustment intensity to the second equipment, and simultaneously, transmitting an angle adjustment message to the second equipment, wherein the angle adjustment message comprises a fine adjustment angle, so that the second equipment adjusts the direction of the interference light according to the fine adjustment angle.
Wherein the parameters of the holographically projected image comprise: the height of the holographically projected image, the initial angle, the second distance, the external light intensity and the brightness of the holographically projected image; the initial angle is an included angle between a connecting line of the human eyes and the center point of the holographic projection image and the horizontal direction, and the second distance is a distance between the second equipment and the center point of the holographic projection image; and calculating a coarse distance of the second equipment according to the parameters of the holographic projection image, wherein the step comprises the following steps: calculating to obtain an adjustment angle of the second device according to the height of the holographic projection image, the external light intensity and the brightness of the holographic projection image; and calculating to obtain the coarse adjustment distance of the second equipment according to the adjustment angle, the initial angle and the second distance.
Wherein, according to the parameter of the holographic projection image, calculate and obtain the fine tuning angle and illumination adjustment intensity step of the interference light, include: calculating to obtain the illumination adjustment intensity of the interference light according to the texture characteristics of the holographic projection image, the external light intensity and the brightness of the holographic projection image; and calculating to obtain the fine adjustment angle according to the external light intensity, the brightness of the holographic projection image and the height of the holographic projection image.
Wherein, according to the texture characteristic of the holographic projection image, the external light intensity and the brightness of the holographic projection image, the step of calculating the illumination adjustment intensity of the interference light comprises the following steps: if the external light intensity is determined to be less than or equal to the brightness of the holographic projection image, calculating to obtain the illumination adjustment intensity of the interference light according to the sum of the external light intensity and the brightness of the holographic projection image, the texture feature of the holographic projection image and the external light intensity; and if the external light intensity is determined to be greater than the brightness of the holographic projection image, calculating to obtain the illumination adjustment intensity of the interference light according to the difference between the external light intensity and the brightness of the holographic projection image, the texture features of the holographic projection image and the external light intensity.
Wherein, according to the height of the holographic projection image, the external light intensity and the brightness of the holographic projection image, the step of calculating the adjustment angle of the second device comprises the following steps: if the external light intensity is determined to be less than or equal to the brightness of the holographic projection image, calculating to obtain an adjustment angle according to the sum of the external light intensity and the brightness of the holographic projection image, the height of the holographic projection image and the external light intensity; and if the external light intensity is determined to be greater than the brightness of the holographic projection image, calculating to obtain an adjustment angle according to the difference between the external light intensity and the brightness of the holographic projection image, the height of the holographic projection image and the external light intensity.
Before the step of obtaining the coarse-tuning position of the second device by calculating according to the parameters of the holographic projection image, the method further comprises the following steps: acquiring parameters of a holographic projection image, wherein the parameters of the holographic projection image further comprise a first distance, and the first distance is the distance between human eyes and the center point of the holographic projection image; and comparing the first distance with a preset threshold, and if the first distance is determined to be greater than the preset threshold, generating first prompt information, wherein the first prompt information comprises the first distance. So that the user using the first device adjusts the position of the first device according to the first prompt message.
In order to achieve the above object, a second aspect of the present invention provides a peeping prevention method of a holographically projected image, the method comprising: responding to the coarse distance sent by the first equipment, and generating second prompt information, wherein the second prompt information comprises the coarse distance; if the adjustment is determined to be finished, sending a distance adjustment confirmation message to the first equipment; receiving interference light with illumination adjustment intensity, which is transmitted by first equipment, and simultaneously receiving an angle adjustment message transmitted by the first equipment to obtain a fine adjustment angle, wherein the angle adjustment message comprises the fine adjustment angle; and adjusting the angle of the second equipment according to the fine adjustment angle so as to adjust the direction of the interference light.
In order to achieve the above object, a third aspect of the present invention provides a peep prevention device for holographically projected images, comprising: the rough adjustment distance calculation module is used for calculating and obtaining a rough adjustment distance of the second equipment according to the parameters of the holographic projection image and sending the rough adjustment distance to the second equipment; the fine adjustment parameter calculation module is used for responding to a distance adjustment confirmation message returned by the second equipment and calculating and obtaining a fine adjustment angle and illumination adjustment intensity of the interference light according to the parameters of the holographic projection image; and the sending module is used for sending the interference light with the illumination adjustment intensity to the second equipment, and meanwhile, sending an angle adjustment message to the second equipment, wherein the angle adjustment message comprises a fine adjustment angle, so that the second equipment adjusts the direction of the interference light according to the fine adjustment angle.
Wherein the parameters of the holographically projected image comprise: the height of the holographically projected image, the initial angle, the second distance, the external light intensity and the brightness of the holographically projected image; the initial angle is an included angle between a connecting line of the human eyes and the center point of the holographic projection image and the horizontal direction, and the second distance is a distance between the second equipment and the center point of the holographic projection image; the fine tuning parameter calculation module specifically comprises: the illumination intensity adjusting submodule is used for calculating and obtaining the illumination adjusting intensity of the interference light according to the texture characteristics of the holographic projection image, the external light intensity and the brightness of the holographic projection image; and the angle fine-tuning submodule is used for calculating and obtaining a fine-tuning angle according to the external light intensity, the brightness of the holographic projection image and the height of the holographic projection image.
In order to achieve the above object, a fourth aspect of the present invention provides a peep prevention device for a holographically projected image, comprising: the distance prompt module is used for responding to the coarse adjustment distance sent by the first equipment and generating second prompt information, and the second prompt information comprises the coarse adjustment distance; the distance adjustment confirming module is used for sending a distance adjustment confirming message to the first equipment after the adjustment is determined to be finished; the interference light receiving module is used for receiving interference light with illumination adjustment intensity, which is transmitted by first equipment, and simultaneously receiving an angle adjustment message transmitted by the first equipment to obtain a fine adjustment angle, wherein the angle adjustment message comprises the fine adjustment angle; and the angle adjusting module is used for adjusting the angle of the second equipment according to the fine adjustment angle so as to adjust the direction of the interference light.
The invention has the following advantages: the method comprises the steps of obtaining a coarse adjustment distance of interference light through parameter calculation of a holographic projection image, and sending the coarse adjustment distance to second equipment, so that the second equipment can prompt a user to perform coarse adjustment on the position of the second equipment; the method comprises the steps of calculating a fine adjustment angle and illumination adjustment intensity of interference light according to parameters of a holographic projection image, transmitting the interference light with the illumination adjustment intensity to a second device, informing the second device of fine adjustment of the direction of the interference light by the fine adjustment angle, and further obtaining the interference light with higher accuracy, so that the interference light can interfere with the sight of an observer, the observer cannot see the holographic projection image, the peeping prevention effect is achieved, the privacy of user information is guaranteed, and the user experience is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a flow chart of a method for preventing peeking of a holographically projected image according to a first embodiment of the invention;
FIG. 2 is a flow chart of a method for preventing peeking of a holographically projected image according to a second embodiment of the invention;
FIG. 3 is a flow chart of a method for preventing peeking of a holographically projected image according to a third embodiment of the invention;
FIG. 4 is a schematic view of the direction of the disturbance light provided in the third embodiment of the present invention;
FIG. 5 is a block diagram of a privacy device for holographically projected images provided in a fourth embodiment of the present invention;
FIG. 6 is a block diagram of a fine tuning parameter calculation module according to a fourth embodiment of the present invention;
fig. 7 is a block diagram of a peep-proof device for holographically projected images according to a fifth embodiment of the present invention.
In the drawings:
501: coarse distance calculation module 502: fine adjustment parameter calculation module
503: transmission module
601: the illumination intensity adjustment sub-module 602: angle fine-tuning submodule
701: distance prompt module 702: distance adjustment confirming module
703: the disturbing light receiving module 704: angle adjusting module
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
A first embodiment of the present invention relates to a peep-proof method for a holographically projected image. The method and the device are used for ensuring the privacy of the video call when the content of the video call or the three-dimensional projection information of an opposite-end user is displayed by adopting the holographic projection technology.
The details of the implementation of the peep-proof method for holographically projected images in the present embodiment are described in detail below, and the following is only for facilitating understanding of the details of the implementation of the present solution, and is not essential to the implementation of the present solution.
Fig. 1 is a flowchart of a peep-proof method for a hologram projection image in this embodiment, where the method is applicable to a first device, and the first device may be a mobile phone or another intelligent terminal capable of performing a video call.
The method may include the following steps.
In step 101, a coarse adjustment distance of the second device is calculated and obtained according to the parameters of the holographic projection image, and the coarse adjustment distance is sent to the second device.
It should be noted that the first device sends the coarse adjustment distance to the second device, so that the second device can prompt the user to move the arm according to the coarse adjustment distance until the distance between the second device and the vertical reference line corresponding to the center point of the holographic projection image is the coarse adjustment distance.
Wherein the parameters of the holographically projected image comprise: the height of the holographically projected image, the initial angle, the second distance, the external light intensity and the brightness of the holographically projected image; the initial angle is an included angle between a connecting line of the human eyes and the center point of the holographic projection image and the horizontal direction, and the second distance is a distance between the second device and the center point of the holographic projection image.
In one specific implementation, the adjustment angle of the second device is obtained through calculation according to the height of the holographic projection image, the external light intensity and the brightness of the holographic projection image; and calculating to obtain the coarse adjustment distance of the second equipment according to the adjustment angle, the initial angle and the second distance.
The intensity of the disturbance light and the range of the disturbance light are determined by comparing the intensity of the external light with the brightness of the hologram projection image. If the brightness of the hologram projection image is greater than the external light intensity, it is indicated that the observer easily observes the hologram projection image, and it is necessary to enhance the brightness of the disturbance light and to expand the disturbance range of the disturbance light. If the brightness of the holographic projection image is less than or equal to the external light intensity, the holographic projection image is darker and is not easy to be observed by bystanders, the brightness of interference light can be properly reduced, and the interference range of the interference light is narrowed.
In one specific implementation, if the external light intensity is determined to be less than or equal to the brightness of the holographic projection image, calculating to obtain an adjustment angle according to the sum of the external light intensity and the brightness of the holographic projection image, the height of the holographic projection image and the external light intensity; and if the external light intensity is determined to be greater than the brightness of the holographic projection image, calculating to obtain an adjustment angle according to the difference between the external light intensity and the brightness of the holographic projection image, the height of the holographic projection image and the external light intensity.
For example, when the external light intensity is less than or equal to the brightness of the hologram projection image, a monotonically increasing function F is used1(X) to calculate the adjustment angle z, i.e. z ═ F1(X), and the adjustment angle z is positively correlated with p × H (K2+ K1)/K1, where p denotes an adjustment coefficient, z denotes an adjustment angle, X denotes an input angle, K1 denotes an external light intensity, K2 denotes a brightness of the hologram projection image, and H denotes a height of the hologram projection image. Wherein F1(X) may be exThe functions may be log (x), etc., and the calculation functions used above are only examples, and may be other monotone increasing functions not illustrated. Using a monotonically decreasing function F when the external light intensity is greater than the brightness of the holographic projection image2(X) to calculate the adjustment angle z, i.e. z ═ F2(X), and the adjustment angle z is positively correlated to q × H (K1-K2)/K1, where q represents an adjustment coefficient, z represents an adjustment angle, X represents an input angle, K1 represents an external light intensity, K2 represents a brightness of the hologram projection image, and H represents a height of the hologram projection image. Wherein F2(X) may be e-xThe function may be a function such as log (-x), etc., and it should be noted that the above calculation function is only an example, and other non-exemplified monotone decreasing functions are also within the scope of the present application.
In step 102, in response to the distance adjustment confirmation message returned by the second device, the fine adjustment angle and the illumination adjustment intensity of the interference light are calculated and obtained according to the parameters of the holographic projection image.
It should be noted that, after receiving the distance adjustment confirmation message returned by the second device, it is determined that the second device has already adjusted the coarse adjustment distance calculated in step 101, and the user using the second device can reach a suitable position to prepare to receive the interference light, so as to prevent the observer from peeping. Further, the fine adjustment angle and the illumination adjustment intensity of the interference light need to be calculated.
In one specific implementation, the illumination adjustment intensity of the interference light is calculated and obtained according to the texture characteristics of the holographic projection image, the external light intensity and the brightness of the holographic projection image; and calculating to obtain the fine adjustment angle according to the external light intensity, the brightness of the holographic projection image and the height of the holographic projection image.
It should be noted that, the texture feature of the holographically projected image can be characterized by using a matrix of RGB array texture, and the texture feature can be obtained by calculation using the formula textur (RGB), where RGB is an abbreviation for the following colors: red r (red), green g (green), blue b (blue), which indicates the color pattern of the projection image.
In one specific implementation, if the external light intensity is determined to be less than or equal to the brightness of the holographic projection image, calculating to obtain the illumination adjustment intensity of the interference light according to the sum of the external light intensity and the brightness of the holographic projection image, the texture feature of the holographic projection image and the external light intensity; and if the external light intensity is determined to be greater than the brightness of the holographic projection image, calculating to obtain the illumination adjustment intensity of the interference light according to the difference between the external light intensity and the brightness of the holographic projection image, the texture features of the holographic projection image and the external light intensity.
For example, when the external light intensity is less than or equal to the brightness of the holographic projection image, which indicates that the holographic projection image is brighter at this time and the disturbing light needs to be enhanced, the illumination adjustment intensity K3 ═ textur (rgb) (K2+ K1)/K1 may be calculated by the following formula, where K1 indicates the external light intensity, K2 indicates the brightness of the holographic projection image, and textur (rgb) indicates the texture feature of the holographic projection image; when the external light intensity is greater than the brightness of the holographic projection image, indicating that the holographic projection image is dark at this time, the illumination adjustment intensity K3 ═ textur (rgb) (K1-K2)/K1 can be calculated by the following formula, where K1 represents the external light intensity, K2 represents the brightness of the holographic projection image, and textur (rgb) represents the texture feature of the holographic projection image. It should be noted that the above calculation formula is only an example, and other ways of calculating the illumination adjustment intensity of the interference light according to the texture feature of the holographic projection image, the external light intensity, and the brightness of the holographic projection image are also within the scope of the present application.
In one specific implementation, the fine adjustment angle is calculated by the following formula, C ═ m × H (K1-K2)/K1, where m denotes an adjustment coefficient, C denotes the fine adjustment angle, H denotes the height of the hologram projection image, K1 denotes the external light intensity, and K2 denotes the brightness of the hologram projection image.
In step 103, the disturbing light with the illumination adjustment intensity is transmitted to the second device, and at the same time, an angle adjustment message is sent to the second device.
Wherein the angle adjustment message includes a fine adjustment angle.
It should be noted that, when the first device transmits the interference light with the illumination intensity being the illumination adjustment intensity K3 to the second device, the fine adjustment angle is also transmitted to the second device, so that the second device performs angle fine adjustment on the reflector in the second device according to the fine adjustment angle, for example, the reflector is controlled to dynamically rotate slightly in the direction of 360 degrees at the fine adjustment angle, so that the interference light can dynamically move in a small range after being reflected by the reflector, and the privacy of the holographically projected image is further improved.
In the embodiment, the rough adjustment distance of the interference light is obtained through parameter calculation of the holographic projection image, and the rough adjustment distance is sent to the second equipment, so that the second equipment can prompt a user to roughly adjust the position of the second equipment; the method comprises the steps of calculating a fine adjustment angle and illumination adjustment intensity of interference light according to parameters of a holographic projection image, transmitting the interference light with the illumination adjustment intensity to a second device, informing the second device of fine adjustment of the direction of the interference light by the fine adjustment angle, and further obtaining the interference light with higher accuracy, so that the interference light can interfere with the sight of an observer, the observer cannot see the holographic projection image, the peeping prevention effect is achieved, the privacy of user information is guaranteed, and the user experience is improved.
A second embodiment of the present invention relates to a peep-proof method for a holographically projected image. The second embodiment is substantially the same as the first embodiment, and mainly differs therefrom in that: before the coarse adjustment distance of the second device is obtained through calculation according to the parameters of the holographic projection image, the parameters of the holographic projection image also need to be obtained, and first prompt information is generated according to the comparison result of the first distance and a preset threshold value.
Fig. 2 is a flowchart of a peep-proof method for a hologram projection image in this embodiment, where the method may be used for a first device, and the first device may be a mobile phone or another intelligent terminal capable of performing a video call. The method may include the following steps.
In step 201, parameters of the holographic projection image are acquired.
It should be noted that the parameters of the holographically projected image include the height of the holographically projected image, the initial angle, the second distance, the external light intensity and the brightness of the holographically projected image; the initial angle is an included angle between a connecting line of the human eyes and the center point of the holographic projection image and the horizontal direction, and the second distance is a distance between the second device and the center point of the holographic projection image. The parameters of the holographic projection image further comprise a first distance, the first distance being the distance between the human eye and the center point of the holographic projection image. During specific implementation, the first distance can be obtained through calculation of the first device, and the second distance can be obtained through receiving a message reported by the second device.
It should be noted that the projection module for generating the holographic projection image may exist in the first device, or may be independent from the first device, such as a projector, but the projection module needs to establish a communication connection with the first device so that the first device can obtain parameters of the holographic projection image.
In step 202, the first distance is compared with a preset threshold, and if it is determined that the first distance is greater than the preset threshold, first prompt information is generated.
Wherein the first prompt message includes a first distance.
It should be noted that, the first device compares the first distance with a preset threshold, and if the first distance is greater than the preset threshold, generates a first prompt message to prompt a user using the first device to adjust the position of the first device. That is, the first device prompts the user to approach the holographic projection image until the first device detects that the first distance is smaller than a preset threshold, where the preset threshold may be set as the arm length of the user. The first device can broadcast the first prompt information to a user through voice or display the first prompt information through a display screen. And the user using the first equipment adjusts the position of the first equipment according to the first prompt message, so as to obtain a clear holographic projection image.
It should be noted that, the prompting method for the first prompting message may be set according to practical settings, and is not limited to the above example, and other messages that are not illustrated are also within the protection scope of the present invention, and are not described herein again.
In step 203, a coarse adjustment distance of the second device is calculated and obtained according to the parameters of the holographic projection image, and the coarse adjustment distance is sent to the second device.
In step 204, in response to the distance adjustment confirmation message returned by the second device, the fine adjustment angle and the illumination adjustment intensity of the interference light are calculated and obtained according to the parameters of the holographic projection image.
In step 205, the disturbing light with the illumination adjustment intensity is transmitted to the second device, and simultaneously, an angle adjustment message is sent to the second device.
It should be noted that steps 203 to 205 in this embodiment are the same as steps 101 to 103 in the first embodiment, and are not repeated herein.
In this embodiment, the user can adjust the position of the first device by the prompt of the first prompt message, and then a clear holographic projection image is obtained. Calculating according to parameters of the holographic projection image to obtain a coarse adjustment distance of the interference light, and sending the coarse adjustment distance to the second equipment, so that the second equipment can prompt a user to perform coarse adjustment on the position of the second equipment; the method comprises the steps of calculating a fine adjustment angle and illumination adjustment intensity of interference light according to parameters of a holographic projection image, transmitting the interference light with the illumination adjustment intensity to a second device, informing the second device of fine adjustment of the direction of the interference light by the fine adjustment angle, and further obtaining the interference light with higher accuracy, so that the interference light can interfere with the sight of an observer, the observer cannot see the holographic projection image, the peeping prevention effect is achieved, the privacy of user information is guaranteed, and the user experience is improved.
A third embodiment of the present invention relates to a peep-proof method for a hologram projection image. Fig. 3 is a flowchart of a peep-proof method for a hologram projection image in this embodiment, where the method may be used for a second device, and the second device may be an intelligent bracelet or another intelligent terminal with a light reflection function. The method may include the following steps.
In step 301, second prompt information is generated in response to the coarse distance sent by the first device.
Wherein the second prompting message comprises a coarse adjustment distance.
After receiving the coarse adjustment distance sent by the first device, the second device generates second prompt information according to the coarse adjustment distance, and displays the second prompt information through a voice prompt or a screen, so that a user using the second device can adjust the position of the second device according to the second prompt information until the distance of the second device relative to a vertical reference line corresponding to a center point of the holographic projection image is the coarse adjustment distance. And preparing for accurately receiving the interference light transmitted by the first equipment.
In step 302, if it is determined that the adjustment is completed, a distance adjustment confirmation message is sent to the first device.
It should be noted that, after the second device confirms that the coarse adjustment of the distance is completed, a distance adjustment confirmation message is returned to the first device, so that the first device knows that the coarse adjustment of the distance is completed by the second device, and is ready to receive the interference light.
In step 303, the interference light with the illumination adjustment intensity transmitted by the first device is received, and meanwhile, the angle adjustment message transmitted by the first device is received, so as to obtain the fine adjustment angle.
Wherein the angle adjustment message includes a fine adjustment angle.
Note that the fine adjustment angle is calculated by the first device based on the difference between the external light intensity and the brightness of the hologram projection image, the texture feature of the hologram projection image, and the external light intensity.
In step 304, an angle adjustment is performed on the second device according to the fine adjustment angle.
In a concrete realization, the second equipment carries out the fine setting of angle according to the reflex reflector of fine setting angle in the second equipment, for example, control reflex reflector carries out the developments of 360 degrees directions with the fine setting angle and rotate a little for disturbing light can carry out the dynamic movement of small-amplitude after passing through the reflex reflector reflection, with the direction of adjustment disturbing light, and then improves holographic projection image's privacy.
In one specific implementation, as shown in fig. 4, the first device is a mobile phone used by a user, where the mobile phone includes a projection device and an emission device of interference light, and the second device is a smart band worn on a hand of the user.
Establish wireless communication between cell-phone and the intelligent bracelet and be connected (for example, bluetooth connection or WIFI connect etc.). Before the user performs the holographic video call, the mobile phone end detects the direction of the user sight of the holographic video call, for example, the face direction of the call user is locked by infrared induction, face recognition or other sensors.
When a user starts a holographic video call by using a mobile phone, the mobile phone acquires parameters such as a distance L1 between a human eye and a center point of a holographic projection image, an initial angle a (namely an included angle between a connecting line of the human eye and the center point of the holographic projection image and the horizontal direction), and a height H of the holographic projection image. The mobile phone compares the distance L1 with a preset threshold, and if the distance L1 is greater than the preset threshold, the mobile phone prompts the user to approach the holographic projection image until the mobile phone detects that the distance L1 is less than the preset threshold, where the preset threshold may be set as the arm length of the user.
After the adjustment is completed, the mobile phone continuously obtains the external light intensity K1 and the brightness K2 of the holographic projection image, and judges the intensity of the interference light and the range of the interference light by comparing the external light intensity K1 with the brightness K2 of the holographic projection image. If K2 is larger than K1, it is indicated that the observer easily observes the hologram projection image, and it is necessary to enhance the brightness of the disturbance light and to expand the disturbance range of the disturbance light. If K2 is less than or equal to K1, the hologram projection image is dark and not easily observed by a bystander, and the brightness of the disturbance light can be appropriately reduced and the disturbance range of the disturbance light can be narrowed.
Further, calculating to obtain an adjustment angle z of the smart bracelet through the height H of the holographic projection image, the external light intensity K1 and the brightness K2 of the holographic projection image; for example, when the external light intensity K1 is less than or equal to the brightness K2 of the hologram projection image, a monotonically increasing function F is used1(X) to calculate the adjustment angle z, i.e. z ═ F1(X), and the adjustment angle z is positively correlated to p × H (K2+ K1)/K1, wherein p is the adjustment factor. Wherein F1(X) may be exThe functions may be log (x), etc., and the calculation functions used above are only examples, and may be other monotone increasing functions not illustrated. When the external light intensity K1 is greater than the brightness K2 of the hologram projection image, a monotonically decreasing function F is used2(X) to calculate the adjustment angle z, i.e. z ═ F2(X), and the adjustment angle z is positively correlated to q H (K1-K2)/K1, wherein q is the adjustment factor. Wherein F2(X) may be e-xThe function may be a function such as log (-x), etc., and it should be noted that the above calculation function is only an example, and other non-exemplified monotone decreasing functions are also within the scope of the present application.
After the mobile phone obtains the adjustment angle z through calculation, the mobile phone further needs to obtain a coarse adjustment distance S of the smart band through calculation according to the adjustment angle z, the initial angle a and a second distance L2, where the second distance L2 is a distance between the smart band and a center point of the hologram projection image. For example: the coarse adjustment distance S is calculated from the trigonometric function S — L2/sin (a + z), and is a distance from a vertical reference line corresponding to the center point of the hologram projection image, which is obtained after the hologram projection image is rotated by an angle of a + z around the vertical reference line.
And sending the rough adjustment distance S to the intelligent bracelet, so that the intelligent bracelet can prompt a user to move an arm according to the rough adjustment distance S until the distance of an electronic reflector on the intelligent bracelet relative to a vertical datum line corresponding to the center point of the holographic projection image is the rough adjustment distance S. Specifically, the smart band may prompt the user with voice or display the prompt using a screen.
And when the smart bracelet confirms that the coarse distance adjustment is finished, returning a distance adjustment confirmation message to the mobile phone, so that the mobile phone confirms that the coarse distance adjustment is finished.
After the coarse adjustment is completed, the mobile phone further needs to calculate and obtain the illumination adjustment intensity K3 of the interference light according to the texture features of the holographic projection image, the external light intensity K1 and the brightness K2 of the holographic projection image; for example, the handset acquires the texture features of the holographic projection image, and characterizes the texture features using a matrix of RGB array textures, and obtains the texture features by calculation using the formula textur (RGB), where RGB is a color pattern representing the projection image. When K1 is greater than K2, indicating that the hologram projection image at this time is dark, the illumination adjustment intensity K3 ═ textur (rgb) (K1-K2)/K1 can be calculated by the following formula; when K1 is less than or equal to K2, indicating that the hologram projection image is bright at this time and the disturbance light needs to be enhanced, the illumination adjustment intensity K3 ═ textur (rgb) (K2+ K1)/K1 can be calculated by the following formula. It should be noted that the above formula is only an example, and other ways of calculating the illumination adjustment intensity K3 of the disturbing light according to the texture features of the hologram projection image, the external light intensity K1, and the brightness K2 of the hologram projection image are also within the scope of the present application.
After the illumination adjustment intensity K3 of interference light is obtained, the cell-phone sends the interference light of which the illumination intensity is the illumination adjustment intensity K3 to the smart bracelet through a built-in flash lamp or other light emitting modules, the direction of the interference light is aligned with the electronic reflector on the smart bracelet, and the cell-phone obtains the specific position of the electronic reflector on the smart bracelet through the communication interaction of the cell-phone and the smart bracelet.
Meanwhile, the mobile phone calculates and obtains the fine adjustment angle C according to the external light intensity K1, the brightness K2 of the holographic projection image and the height H of the holographic projection image. For example, the fine adjustment angle C is calculated by the following formula, C ═ m × (K1-K2)/K1, where m is an adjustment coefficient. The cell-phone is in the interference light of emitting illumination intensity for illumination adjustment intensity K3 to intelligent bracelet, also sends fine setting angle C for intelligent bracelet carries out the fine setting of angle according to this fine setting angle C to the electron reflector above that, for example, control electron reflector and carry out the developments of 360 degrees directions with fine setting angle C and rotate a little, make interference light pass through electron reflector reflection back, can carry out the dynamic movement of small range, and then improve the privacy of holographically projected image.
It should be noted that the electronic reflective mirror may also be a reflective mirror with different physical forms, such as a multi-prism reflective mirror, a multi-directional reflective mirror, etc., which is not illustrated herein, and other reflective mirrors not illustrated are also within the scope of the present application.
The mobile phone adjusts the angle a + z in real time through detecting the face moving range of the call main body, the brightness of the holographic projection image and the texture characteristics of the holographic projection image in real time, and adjusts the position corresponding to the intelligent bracelet and the reflector on the intelligent bracelet again according to the steps, so that the interference function of interference light is improved, a bystander cannot look up the holographic projection image, and the privacy of the holographic projection image is ensured.
In this embodiment, the second prompt message is generated by the received rough adjustment distance sent by the first device to prompt the user using the second device to adjust the position of the second device, and after the disturbing light with the illumination adjustment intensity is received, the light reflecting device in the second device is finely adjusted by the fine adjustment angle, so as to adjust the direction of the disturbing light, so that the observer cannot see the hologram projection image, and the privacy of the hologram projection image is ensured.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
The fourth embodiment of the present invention relates to a peep-proof device for holographically projected images, and the specific implementation of the device can be referred to the related description of the first embodiment, and repeated details are not repeated. It should be noted that, the specific implementation of the apparatus in this embodiment may also refer to the related description of the second embodiment, but is not limited to the above two examples, and other unexplained examples are also within the protection scope of the apparatus.
As shown in fig. 5, the apparatus mainly includes: a coarse adjustment distance calculation module 501, configured to calculate a coarse adjustment distance of the second device according to the parameter of the holographic projection image, and send the coarse adjustment distance to the second device; a fine-tuning parameter calculation module 502, configured to calculate, in response to a distance adjustment confirmation message returned by the second device, a fine-tuning angle and an illumination adjustment intensity of the interference light according to a parameter of the holographic projection image; a sending module 503, configured to send the interference light with the illumination adjustment intensity to the second device, and send an angle adjustment message to the second device, where the angle adjustment message includes a fine adjustment angle, so that the second device adjusts the direction of the interference light according to the fine adjustment angle.
In one example, parameters of the holographically projected image include: the height of the holographically projected image, the initial angle, the second distance, the external light intensity and the brightness of the holographically projected image; the initial angle is an included angle between a connecting line of the human eyes and the center point of the holographic projection image and the horizontal direction, and the second distance is a distance between the second equipment and the center point of the holographic projection image;
as shown in fig. 6, the fine tuning parameter calculation module 502 specifically includes: the illumination intensity adjusting submodule 601 is configured to calculate and obtain an illumination adjustment intensity of the interference light according to texture features of the holographic projection image, external light intensity, and brightness of the holographic projection image; and the angle fine-tuning submodule 602 is configured to calculate and obtain a fine-tuning angle according to the external light intensity, the brightness of the holographic projection image, and the height of the holographic projection image.
The fifth embodiment of the present invention relates to a peep-proof device for holographically projected images, and the specific implementation of the device can be referred to the related description of the third embodiment, but is not limited to the above embodiments, and the repeated details are not repeated. Other undescribed embodiments are within the scope of the present device.
Fig. 7 shows a privacy device for holographically projected images, comprising: a distance prompt module 701, configured to generate second prompt information in response to the coarse distance sent by the first device, where the second prompt information includes the coarse distance; a distance adjustment confirming module 702, configured to send a distance adjustment confirming message to the first device after the adjustment is completed; the interference light receiving module 703 is configured to receive interference light with illumination adjustment intensity, which is transmitted by the first device, and at the same time, receive an angle adjustment message sent by the first device to obtain a fine adjustment angle, where the angle adjustment message includes the fine adjustment angle; an angle adjusting module 704, configured to perform an angle adjustment on the second device according to the fine adjustment angle to adjust the direction of the interference light.
It should be noted that each module referred to in this embodiment is a logical module, and in practical applications, one logical unit may be one physical unit, may be a part of one physical unit, and may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims (10)

1. A method of privacy viewing of a holographically projected image, said method comprising:
calculating and obtaining coarse adjustment information of second equipment according to parameters of the holographic projection image, and sending the coarse adjustment information to the second equipment;
responding to a distance adjustment confirmation message returned by the second equipment, and calculating and obtaining a fine adjustment angle and illumination adjustment intensity of interference light according to parameters of the holographic projection image;
transmitting interference light with the illumination adjustment intensity to the second device, and simultaneously, sending an angle adjustment message to the second device, wherein the angle adjustment message comprises the fine adjustment angle, so that the second device adjusts the direction of the interference light according to the fine adjustment angle;
the coarse adjustment information comprises a coarse adjustment distance and an adjustment angle.
2. The method of claim 1, wherein the parameters of the holographically projected image comprise:
the height of the holographically projected image, the initial angle, the second distance, the external light intensity and the brightness of the holographically projected image;
the initial angle is an included angle between a connecting line of human eyes and a center point of the holographic projection image and the horizontal direction, and the second distance is a distance between the second equipment and the center point of the holographic projection image;
the step of calculating and obtaining the coarse adjustment distance of the second equipment according to the parameters of the holographic projection image comprises the following steps:
calculating to obtain an adjustment angle of the second device according to the height of the holographic projection image, the external light intensity and the brightness of the holographic projection image;
and calculating to obtain a coarse adjustment distance of the second equipment according to the adjustment angle, the initial angle and the second distance.
3. The peep-proof method for holographically projected images according to claim 2, wherein the step of calculating the fine adjustment angle and the illumination adjustment intensity of the interference light according to the parameters of the holographically projected images comprises the following steps:
calculating to obtain the illumination adjustment intensity of the interference light according to the texture features of the holographic projection image, the external light intensity and the brightness of the holographic projection image;
and calculating to obtain a fine adjustment angle according to the external light intensity, the brightness of the holographic projection image and the height of the holographic projection image.
4. The peep-proof method for holographically projected images according to claim 3, wherein the step of calculating the illumination adjustment intensity of the interference light according to the texture features of the holographically projected images, the external light intensity and the brightness of the holographically projected images comprises:
if the external light intensity is determined to be less than or equal to the brightness of the holographic projection image, calculating to obtain the illumination adjustment intensity of the interference light according to the sum of the external light intensity and the brightness of the holographic projection image, the texture feature of the holographic projection image and the external light intensity;
and if the external light intensity is determined to be greater than the brightness of the holographic projection image, calculating to obtain the illumination adjustment intensity of the interference light according to the difference between the external light intensity and the brightness of the holographic projection image, the texture features of the holographic projection image and the external light intensity.
5. The peep-proof method for holographically projected images according to claim 2, wherein the step of calculating the adjustment angle of the second device according to the height of the holographically projected image, the external light intensity and the brightness of the holographically projected image comprises:
if the external light intensity is determined to be less than or equal to the brightness of the holographic projection image, calculating to obtain the adjustment angle according to the sum of the external light intensity and the brightness of the holographic projection image, the height of the holographic projection image and the external light intensity;
and if the external light intensity is determined to be greater than the brightness of the holographic projection image, calculating to obtain the adjustment angle according to the difference between the external light intensity and the brightness of the holographic projection image, the height of the holographic projection image and the external light intensity.
6. The method for peeping prevention of a holographically projected image according to any of claims 1 to 5, further comprising, before the step of calculating a coarse position of the second device based on the parameters of the holographically projected image:
acquiring parameters of the holographic projection image, wherein the parameters of the holographic projection image further comprise a first distance, and the first distance is the distance between human eyes and the center point of the holographic projection image;
and comparing the first distance with a preset threshold, and if the first distance is determined to be greater than the preset threshold, generating first prompt information, wherein the first prompt information comprises the first distance.
7. A method of privacy viewing of a holographically projected image, said method comprising:
responding to coarse adjustment information sent by first equipment, and generating second prompt information, wherein the second prompt information comprises the coarse adjustment information;
if the adjustment is determined to be finished, sending a distance adjustment confirmation message to the first equipment;
receiving interference light with illumination adjustment intensity, which is emitted by the first device, and simultaneously receiving an angle adjustment message sent by the first device to obtain a fine adjustment angle, wherein the angle adjustment message comprises the fine adjustment angle;
according to the fine adjustment angle, angle adjustment is carried out on the second equipment so as to adjust the direction of the interference light;
the coarse adjustment information comprises a coarse adjustment distance and an adjustment angle.
8. A privacy device for holographically projecting an image, comprising:
the system comprises a coarse adjustment information calculation module, a holographic projection image generation module and a coarse adjustment information processing module, wherein the coarse adjustment information calculation module is used for calculating and obtaining coarse adjustment information of second equipment according to parameters of the holographic projection image and sending the coarse adjustment information to the second equipment, and the coarse adjustment information comprises a coarse adjustment distance and an adjustment angle;
the fine adjustment parameter calculation module is used for responding to a distance adjustment confirmation message returned by the second equipment and calculating and obtaining a fine adjustment angle and illumination adjustment intensity of interference light according to the parameters of the holographic projection image;
and the sending module is used for sending the interference light with the illumination adjustment intensity to the second equipment, and meanwhile, sending an angle adjustment message to the second equipment, wherein the angle adjustment message comprises the fine adjustment angle, so that the second equipment adjusts the direction of the interference light according to the fine adjustment angle.
9. The privacy device of claim 8, wherein the parameters of the holographically projected image comprise:
the height of the holographically projected image, the initial angle, the second distance, the external light intensity and the brightness of the holographically projected image;
the initial angle is an included angle between a connecting line of human eyes and a center point of the holographic projection image and the horizontal direction, and the second distance is a distance between the second equipment and the center point of the holographic projection image;
the fine tuning parameter calculation module specifically includes:
the illumination intensity adjusting submodule is used for calculating and obtaining the illumination adjusting intensity of the interference light according to the texture characteristics of the holographic projection image, the external light intensity and the brightness of the holographic projection image;
and the angle fine-tuning submodule is used for calculating and obtaining a fine-tuning angle according to the intensity of external light, the brightness of the holographic projection image and the height of the holographic projection image.
10. A privacy device for holographically projecting an image, comprising:
the distance prompting module is used for responding to coarse adjustment information sent by first equipment and generating second prompting information, wherein the second prompting information comprises the coarse adjustment information, and the coarse adjustment information comprises a coarse adjustment distance and an adjustment angle;
the distance adjustment confirming module is used for sending a distance adjustment confirming message to the first equipment after the adjustment is determined to be finished;
the interference light receiving module is used for receiving interference light with illumination adjustment intensity, which is emitted by the first device, and simultaneously receiving an angle adjustment message sent by the first device to obtain a fine adjustment angle, wherein the angle adjustment message comprises the fine adjustment angle;
and the angle adjusting module is used for adjusting the angle of the second equipment according to the fine adjustment angle so as to adjust the direction of the interference light.
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