CN115695755A - Projection picture size control method and device, projection equipment and storage medium - Google Patents
Projection picture size control method and device, projection equipment and storage medium Download PDFInfo
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Abstract
The application discloses a method and a device for controlling the size of a projection picture, projection equipment and a storage medium, and belongs to the technical field of intelligent home technology. The control method of the projection picture size comprises the following steps: carrying out data interaction by utilizing the UWB base station and the UWB tag, and determining the position of a user according to data interaction time; the UWB tag is arranged on a terminal device, and the user position is the position of a user carrying the terminal device; determining a viewing distance between the user and a projection screen according to the user position, and determining a target projection picture size according to the viewing distance; and projecting to the projection screen according to the size of the target projection picture. According to the method and the device, the size of the projection picture can be adjusted in a self-adaptive mode, and the user experience is improved.
Description
Technical Field
The present application relates to the field of smart home technologies, and in particular, to a method and an apparatus for controlling a projection screen size, a projection device, and a storage medium.
Background
The smart home (home automation) system is a management system which integrates facilities related to home life by using a home as a platform and utilizing a comprehensive wiring technology, a network communication technology, a security technology, an automatic control technology and an audio and video technology to construct efficient home facilities and home schedule affairs. The intelligent home system can organically combine all subsystems (such as security, light control, curtain control, gas valve control, information and household appliances, scene linkage, floor heating, health care, epidemic prevention, security and protection and the like) related to home life, and provides brand-new home life experience for users.
The home theater is an important component of the smart home, is simple to build and low in entrance cost, and needs to be built by one or more projection devices. At present, the size of a projection picture of projection equipment is a fixed size, and when the distance between a user and a projection screen is changed, the situation that the size of the picture in the field of view of the user is too large or too small can be caused, so that the user experience is influenced.
Therefore, how to adaptively adjust the size of the projection screen and improve the user experience is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The application aims to provide a method and a device for controlling the size of a projection picture, projection equipment and a storage medium, which can adaptively adjust the size of the projection picture and improve user experience.
In order to solve the above technical problem, the present application provides a method for controlling a projection screen size, which is applied to a projection apparatus including at least two UWB base stations, the method for controlling the projection screen size including:
carrying out data interaction by utilizing the UWB base station and the UWB tag, and determining the position of a user according to data interaction time; the UWB tag is arranged on a terminal device, and the user position is the position of a user carrying the terminal device;
determining a viewing distance between the user and a projection screen according to the user position, and determining a target projection picture size according to the viewing distance;
and projecting to the projection screen according to the size of the target projection picture.
Optionally, performing data interaction with the UWB base station and the UWB tag, and determining a user location according to a data interaction time includes:
sending a ranging data packet to the UWB tag by utilizing the UWB base station, and recording a first time stamp of the ranging data packet sent by the UWB base station;
receiving an acknowledgement data packet returned by the UWB tag; wherein the acknowledgement data packet comprises a second timestamp at which the UWB tag receives the ranging data packet;
taking a time difference between the first time stamp and the second time stamp as the data interaction time;
calculating the distance between the UWB tag and the UWB base station according to the data interaction time;
and calculating the position of the user according to the distance between the UWB tag and each UWB base station.
Optionally, determining a viewing distance between the user and the projection screen according to the user position includes:
determining a man-machine distance between a user of the terminal equipment and the projection equipment in a preset direction according to the user position; the preset direction is the projection direction of the projection equipment;
calculating the viewing distance between the user and a projection screen according to the projection distance and the man-machine distance;
the projection distance is the distance between the projection equipment and the projection screen in the preset direction.
Optionally, determining a size of the target projection screen according to the viewing distance includes:
determining a target distance interval where the viewing distance is located;
and determining the size of the target projection picture corresponding to the target distance interval according to the corresponding relation between the distance interval and the size of the projection picture.
Optionally, determining a size of the target projection screen according to the viewing distance includes:
calculating the size of the target projection picture corresponding to the viewing distance according to a preset rule; wherein the preset rule is that the viewing distance is positively correlated with the size of the target projection picture.
Optionally, after determining the user position according to the data interaction time, the method further includes:
and adjusting the projection position of the projection equipment on the projection screen according to the user position.
Optionally, after determining the user position according to the data interaction time, the method further includes:
determining a listening distance between the user and an audio playing device according to the user position, and determining a target volume according to the listening distance;
and adjusting the current volume of the audio playing device according to the target volume.
The present application further provides a control device of a projection screen size, which is applied to a projection apparatus including at least two UWB base stations, the control device of the projection screen size includes:
the position determining module is used for carrying out data interaction with the UWB tag by utilizing the UWB base station and determining the position of a user according to data interaction time; the UWB tag is arranged on terminal equipment, and the user position is the position of a user carrying the terminal equipment;
the size determining module is used for determining the viewing distance between the user and a projection screen according to the user position and determining the size of a target projection picture according to the viewing distance;
and the size adjusting module is used for projecting to the projection screen according to the size of the target projection picture.
The application also provides a storage medium, on which a computer program is stored, which when executed realizes the steps executed by the control method of the projection picture size.
The application also provides a projection device, which comprises at least two UWB base stations, a memory and a processor, wherein the memory is stored with a computer program, and the processor realizes the steps executed by the control method of the projection picture size when calling the computer program in the memory.
The application provides a control method of projection picture size, which is applied to projection equipment comprising at least two UWB base stations, and comprises the following steps: carrying out data interaction by utilizing the UWB base station and the UWB tag, and determining the position of a user according to data interaction time; the UWB tag is arranged on terminal equipment, and the user position is the position of a user carrying the terminal equipment; determining a viewing distance between the user and a projection screen according to the user position, and determining a target projection picture size according to the viewing distance; and projecting to the projection screen according to the size of the target projection picture.
The projection equipment that this application provided includes two at least UWB basic stations, and the terminal equipment that the user carried is provided with the UWB label, can carry out data interaction between UWB label and the UWB basic station, and this application can confirm user's position according to above-mentioned data interaction time. The projection device projects a picture onto the projection screen, and the user views the projected content through the projection screen, and after obtaining the user position, the distance between the user and the projection screen, that is, the viewing distance of the user, can be determined. The method and the device determine the size of the target projection picture according to the viewing distance of the user, so that the projection equipment performs projection operation according to the size of the target projection picture. In the scheme, the size of the projection picture of the projection equipment can be dynamically adjusted according to the watching distance of the user, so that the size of the picture watched by the user is relatively stable, the size of the projection picture can be adaptively adjusted, and the user experience is improved. The application also provides a control device for the size of the projection picture, a storage medium and a projection device, which have the beneficial effects and are not repeated herein.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings needed for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a flowchart of a method for controlling a projection screen size according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application;
fig. 3 is a schematic diagram of a UWB base station and a UWB tag for data interaction according to an embodiment of the present application;
fig. 4 is a schematic diagram illustrating a principle of determining a human-machine distance according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a projection screen before and after being changed in size according to an embodiment of the present disclosure;
fig. 6 is a flowchart of a UWB-based home theater control method according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a device for controlling a projection screen size according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Referring to fig. 1, fig. 1 is a flowchart of a method for controlling a projection screen size according to an embodiment of the present disclosure.
The method comprises the following specific steps:
s101: carrying out data interaction by utilizing the UWB base station and the UWB tag, and determining the position of a user according to data interaction time;
the present embodiment may be applied to a projection device including at least two UWB base stations, and a specific operation in the present embodiment may be implemented by a processor in the projection device, where the processor is connected to the two UWB base stations respectively.
In the place where the projection device is located, there is also a user carrying a terminal device, and the terminal device is provided with a UWB tag capable of performing data interaction with the UWB base station. The terminal equipment can be equipment such as intelligent bracelet, intelligent wrist-watch, AR glasses, smart mobile phone, bluetooth headset, projection equipment's remote controller.
In this step, at least two UWB base stations may be used to perform data interaction with the UWB tag, and then the position of the UWB tag may be calculated according to the data interaction time. It should be noted that, a certain time is required for the UWB base station and the UWB tag to transmit data, and the user position may be calculated according to the data interaction time and the data transmission speed. The user position mentioned above specifically refers to the relative position of the user with respect to the projection device.
S102: determining a viewing distance between the user and a projection screen according to the user position, and determining a target projection picture size according to the viewing distance;
the positions of the projection device and the projection screen are relatively fixed, the embodiment can read the relative position of the projection device and the projection screen from the configuration file, and the viewing distance between the user and the projection screen can be determined according to the relative position of the projection device and the projection screen and the position of the user.
Further, the projection device may store a corresponding relationship between each viewing distance and a projection screen size (i.e., a frame size) in advance, and may determine a target projection screen size corresponding to the current viewing distance of the user according to the corresponding relationship.
S103: and projecting to the projection screen according to the size of the target projection picture.
Before the step, whether the size of the target projection picture is the same as that of the current projection picture can be judged; if the two are the same, ending the process; and if the image size is different, projecting the image to the projection screen according to the size of the target projection image. As a possible implementation manner, the position of the center point of the front and back projection pictures is not changed by performing S103. As another possible implementation manner, after S102 and before S103, the projection position of the projection device on the projection screen (i.e., the coordinates of the center point of the projection screen) may be adjusted according to the user position, in which case the positions of the center points of the front and rear projection screens are changed after S103 is executed, and the above-mentioned manner can adjust the projection position according to the user position, thereby improving the user experience. Specifically, the adjustment direction of the projection position is the same as the change direction of the user position.
The projection device provided by the embodiment comprises at least two UWB base stations, terminal equipment carried by a user is provided with a UWB tag, data interaction can be carried out between the UWB tag and the UWB base stations, and the embodiment can determine the position of the user according to the data interaction time. The projection device projects a picture onto the projection screen, the user views the projected content through the projection screen, and after obtaining the user position, the distance between the user and the projection screen, that is, the viewing distance of the user, can be determined. The present embodiment determines a target projection screen size according to the viewing distance of the user, so that the projection device performs a projection operation according to the target projection screen size. In the above scheme, the size of the projection picture of the projection device can be dynamically adjusted according to the viewing distance of the user, so that the size of the picture viewed by the user is relatively stable. This embodiment is more stable through UWB basic station transmission data, and projection collocation UWB locate function realizes projection picture size and volume synchronization adjustment, and is more intelligent, the theory of laminating intelligent house.
As a possible implementation manner, the process of determining the user location in the above embodiment may include the following steps:
step A1: sending a ranging data packet to the UWB tag by utilizing the UWB base station, and recording a first time stamp of the ranging data packet sent by the UWB base station;
before this step, there may be an operation of receiving a ranging request sent by the UWB tag, and after receiving the ranging request, the UWB base station is used to send a ranging packet to the UWB tag. The first time stamp includes a time point when the UWB base station transmits the ranging packet to the UWB tag.
Step A2: receiving an acknowledgement data packet returned by the UWB tag;
wherein the acknowledgement data packet comprises a second timestamp at which the UWB tag receives the ranging data packet; the second timestamp includes a time point when the UWB tag receives the ranging packet.
Step A3: taking the time difference of the first time stamp and the second time stamp as the data interaction time;
in this step, the time point in the first timestamp may be subtracted from the time point in the second timestamp to obtain a time difference, and the time difference is used as the data interaction time. Therefore, the data interaction time specifically refers to: the ranging packet is time consuming for the UWB base station to reach the UWB tag.
Step A4: calculating the distance between the UWB tag and the UWB base station according to the data interaction time;
specifically, the step may multiply the data interaction time by the transmission rate of the data in the space to obtain the distance between the UWB tag and each UWB base station.
Step A5: and calculating the position of the user according to the distance between the UWB tag and each UWB base station.
After obtaining the distances between the UWB tag and at least 2 UWB base stations, the location of the UWB tag may be determined according to the distances. The present application may represent UWB tags as user locations. In order to improve the accuracy of determining the position of the user, when 2 UWB base stations exist in the projection equipment, the connecting line of the 2 UWB base stations is parallel to the ground; when there are 3 UWB base stations in the projection device, the 3 UWB base stations are not on the same straight line.
As a further description of the embodiment corresponding to fig. 1, in practical applications, the projection device may face the projection screen (that is, a central axis of a light source of the projection device intersects with a symmetry axis in a vertical direction of the projection screen), and in the foregoing case, the application may determine, according to a user position, a man-machine distance between a user of the terminal device and the projection device in a preset direction, where the preset direction is a projection direction of the projection device (the projection direction at this time is a direction in which the central axis of the light source is located), and subtract the man-machine distance from a distance between the projection device and the projection screen to obtain the viewing distance.
In practical application, the projection device may also be obliquely opposite to the projection screen (that is, a central axis of a light source of the projection device does not intersect with a symmetry axis in a vertical direction of the projection screen), and under the above condition, the embodiment may determine a human-computer distance between the user of the terminal device and the projection device in a preset direction according to the user position; the preset direction is a projection direction of the projection equipment (the projection direction at this time is a connecting line direction of a light source and a central point of a projection screen); calculating the viewing distance between the user and a projection screen according to the projection distance and the man-machine distance; the projection distance is the distance between the projection equipment and the projection screen in the preset direction. By means of the mode, the control scene of the size of the projection picture can be enriched, and the accuracy of size adjustment is improved.
As a further description of the corresponding embodiment of fig. 1, the present embodiment may determine the target projection screen size in at least two ways:
mode 1: adjusting the size of a target projection picture in real time according to the viewing distance;
mode 2: and adjusting the size of the target projection picture in a segmentation mode according to the viewing distance.
If the method 1 is used for determining the size of the target projection picture, the implementation process comprises the following steps: calculating the size of the target projection picture corresponding to the viewing distance according to a preset rule; wherein the preset rule is that the viewing distance is positively correlated with the size of the target projection picture.
If the method 2 is used to determine the size of the target projection picture, the implementation process includes the following steps: determining a target distance interval where the viewing distance is located; and determining the target projection picture size corresponding to the target distance interval according to the corresponding relation between the distance interval and the projection picture size. As a possible implementation, the present embodiment may set the following three distance intervals: (0 m, 5 m), [5 m, 10 m), [10 m, 20 m), the projection screen size corresponding to the interval [5 m, 10 m) is 50 inches, and the projection screen size corresponding to the interval [10 m, 20 m) is 100 inches.
As a further introduction to the corresponding embodiment of fig. 1, after determining the user position according to the data interaction time, the listening distance between the user and the audio playing device may also be determined according to the user position, and the target volume may be determined according to the listening distance; and adjusting the current volume of the audio playing device according to the target volume.
Specifically, the present embodiment may determine an interval where the listening distance is located; and determining the target volume according to the corresponding relation between the interval of the listening distance and the volume. The target volume corresponding to the listening distance can be determined according to a volume calculation rule; wherein the volume calculation rule is that the listening distance is positively correlated with the target volume. According to the embodiment, the user position is detected through the UWB positioning function, and the volume can be adjusted in real time according to the user position.
The flow described in the above embodiment is explained below by an embodiment in practical use.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a projection device according to an embodiment of the present disclosure, where the projection device includes a micro control unit MCU, a UWB base station and other modules, and the UWB base station is connected to the MCU through a serial port to implement high-speed communication; the other modules are used for supporting the normal playing function of the projection equipment, such as a system operation kernel and a video and audio playing device.
Referring to fig. 3, fig. 3 is a schematic diagram of a UWB base station and a UWB tag performing data interaction according to an embodiment of the present application, where fig. 3 illustrates an interaction process between the UWB base station and the UWB tag, the UWB tag requests the UWB base station to perform ranging at time T1, the UWB base station receives the request at time T2 and replies a ranging packet to the UWB tag at time T3, the UWB tag receives the ranging packet at time T4 and returns response information confirming that the ranging packet is received to the UWB base station at time T5, and the UWB base station receives the response information at time T6.
Chips in the UWB base station and the UWB tag provide a time stamp for recording data frames when the data frames are transmitted and received, which is a basic condition for enabling ranging between two points, and a data flight distance = a data flight time in the air × an optical speed, thereby measuring a distance between the UWB base station and the UWB tag.
After determining the data frame transceiving time stamp, the UWB base station needs to provide a sufficiently high clock accuracy, because a time electromagnetic wave of 1ns transmits 30 cm, the UWB chip provides a microcode of LDE (a microcode for recording time), the clock reaches a frequency of 64G by a phase locked loop PLL, of course, the clock is only provided for use by LDE, so that the UWB chip has the ultra-high accuracy time stamp, and the 64G clock can make the UWB clock resolution of 15.65ps, ps mean picosecond.
Please refer to fig. 4, fig. 4 is a schematic diagram illustrating a human-computer distance determining principle provided in an embodiment of the present application, where the schematic diagram illustrates UWB base stations a, B, and C disposed in a projection device, where User1 and User2, L1 is a distance between User1 and UWB base station a, L2 is a distance between User1 and UWB base station B, L3 is a distance between User1 and UWB base station C, L1 is a distance between User2 and UWB base station a, L2 is a distance between User2 and UWB base station B, L3 is a distance between User2 and UWB base station C, and D represents a human-computer distance between a User and the projection device in a projection direction. In the embodiment, one UWB tag is respectively communicated with a plurality of UWB base stations, the distances between the UWB tag and each base station are respectively obtained, and accurate position information is calculated. As shown in fig. 4, the projection device carries three UWB devices a, B, and C as base stations, the User uses another UWB device (remote controller) as a tag, and after the device operates, the device continuously sends data to obtain values of l1, l2, and l3 in real time, and calculates a vertical distance D according to the pythagorean theorem, and the device adjusts the volume and the picture through the distance D.
After the human-computer distance D is measured, the viewing distance between a person and the projection screen can be calculated, and the size of the picture can be adjusted in real time according to the requirements of a user. When the projection equipment is fixed, a user sets the size of a default picture, when the user moves the position, the visual angle is unchanged, and in order to not affect the appearance, the size of the projection picture is reduced to ensure that the whole picture is arranged in the visual field of the user, so that the integrity of the picture is ensured. And the lens is driven by PWM to adjust the size of a projection picture. In order to prevent the influence of small-amplitude movement, the size of the projection screen may be set to a large size when the viewing distance is a long distance, to a medium size when the viewing distance is a medium distance, and to a small size when the viewing distance is a short distance.
Please refer to fig. 5, fig. 5 is a schematic diagram of a projection screen before and after changing a size of the projection screen according to an embodiment of the present disclosure, and fig. 5 shows a projection screen size 1 corresponding to a user at a position a and a projection screen size 2 corresponding to a user at a position B.
Referring to fig. 6, fig. 6 is a flowchart of a UWB-based home theater control method according to an embodiment of the present application, where after a system of a projection device is started, values are assigned to an initial volume and an initial projection screen size of the projection device, and all subsequent adjustments according to position changes are based on the values. The UWB base station continuously reads the position information of the UWB tag. And when the change of the vertical position of the UWB tag is detected, adjusting the size and volume of the projection picture according to the position. Specifically, the present embodiment may determine a matching result between the viewing distance and the three values, and the projection device may adjust the size of the projection image according to the matching result, and adjust the volume in real time according to the change of the viewing distance. The embodiment is based on the UWB technology, realizes the transmission of video data, namely the playing of the home theater, and realizes the regulation and control of the picture according to the UWB positioning function, thereby improving the experience of the user.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a control device for a projection screen size according to an embodiment of the present application, which is applied to a projection apparatus including at least two UWB base stations, and the control device for the projection screen size includes:
a position determining module 701, configured to perform data interaction with the UWB tag by using the UWB base station, and determine a user position according to data interaction time; the UWB tag is arranged on terminal equipment, and the user position is the position of a user carrying the terminal equipment;
a size determining module 702, configured to determine a viewing distance between the user and a projection screen according to the user position, and determine a size of a target projection picture according to the viewing distance;
a size adjusting module 703, configured to project the projection screen according to the size of the target projection image.
The projection device provided by the embodiment comprises at least two UWB base stations, terminal equipment carried by a user is provided with a UWB tag, data interaction can be carried out between the UWB tag and the UWB base stations, and the embodiment can determine the position of the user according to the data interaction time. The projection device projects a picture onto the projection screen, the user views the projected content through the projection screen, and after obtaining the user position, the distance between the user and the projection screen, that is, the viewing distance of the user, can be determined. The present embodiment determines a target projection screen size according to the viewing distance of the user, so that the projection device performs a projection operation according to the target projection screen size. In the above scheme, the size of the projection picture of the projection device can be dynamically adjusted according to the viewing distance of the user, so that the size of the picture viewed by the user is relatively stable.
Further, the position determining module 701 performs data interaction with the UWB tag by using the UWB base station, and the process of determining the user position according to the data interaction time includes: sending a ranging data packet to the UWB tag by utilizing the UWB base station, and recording a first time stamp of the ranging data packet sent by the UWB base station; receiving an acknowledgement data packet returned by the UWB tag; wherein the acknowledgement packet comprises a second timestamp at which the UWB tag receives the ranging packet; taking a time difference between the first time stamp and the second time stamp as the data interaction time; calculating the distance between the UWB tag and the UWB base station according to the data interaction time; and calculating the user position according to the distance between the UWB tag and each UWB base station.
Further, the process of the size determining module 702 determining the viewing distance between the user and the projection screen according to the user position includes: determining a man-machine distance between a user of the terminal equipment and the projection equipment in a preset direction according to the user position; the preset direction is the projection direction of the projection equipment; calculating the viewing distance between the user and a projection screen according to the projection distance and the man-machine distance; the projection distance is the distance between the projection equipment and the projection screen in the preset direction.
Further, the process of the size determining module 702 determining the size of the target projection screen according to the viewing distance includes: determining a target distance interval where the viewing distance is located; and determining the target projection picture size corresponding to the target distance interval according to the corresponding relation between the distance interval and the projection picture size.
Further, the process of the size determination module 702 determining the size of the target projection screen according to the viewing distance includes: calculating the size of the target projection picture corresponding to the viewing distance according to a preset rule; wherein the preset rule is that the viewing distance is positively correlated with the size of the target projection picture.
Further, the method also comprises the following steps:
and the position adjusting module is used for adjusting the projection position of the projection equipment on the projection screen according to the user position after the user position is determined according to the data interaction time.
Further, the method also comprises the following steps:
the volume adjusting module is used for determining the listening distance between the user and the audio playing device according to the user position after determining the user position according to the data interaction time, and determining the target volume according to the listening distance; and the audio playing device is also used for adjusting the current volume of the audio playing device according to the target volume.
Since the embodiments of the apparatus portion and the method portion correspond to each other, please refer to the description of the embodiments of the method portion for the embodiments of the apparatus portion, which is not repeated here.
The present application also provides a storage medium having a computer program stored thereon, which when executed, may implement the steps provided by the above-described embodiments. The storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The present application further provides a projection device, which may include at least two UWB base stations, a memory and a processor, where the memory stores a computer program, and the processor calls the computer program in the memory to implement the steps provided in the foregoing embodiments. Of course, the projection device may also include various network interfaces, power supplies, and the like.
The embodiments are described in a progressive mode in the specification, the emphasis of each embodiment is on the difference from the other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, without departing from the principle of the present application, the present application can also make several improvements and modifications, and those improvements and modifications also fall into the protection scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A method for controlling the size of a projection screen, which is applied to a projection device comprising at least two UWB base stations, the method for controlling the size of the projection screen comprises the following steps:
carrying out data interaction by utilizing the UWB base station and the UWB tag, and determining the position of a user according to data interaction time; the UWB tag is arranged on a terminal device, and the user position is the position of a user carrying the terminal device;
determining a viewing distance between the user and a projection screen according to the user position, and determining a target projection picture size according to the viewing distance;
and projecting to the projection screen according to the size of the target projection picture.
2. The method for controlling the size of a projected picture according to claim 1, wherein the step of determining the position of the user based on the data interaction time by using the UWB base station to perform data interaction with the UWB tag comprises:
sending a ranging data packet to the UWB tag by utilizing the UWB base station, and recording a first time stamp of the ranging data packet sent by the UWB base station;
receiving an acknowledgement data packet returned by the UWB tag; wherein the acknowledgement data packet comprises a second timestamp at which the UWB tag receives the ranging data packet;
taking a time difference between the first time stamp and the second time stamp as the data interaction time;
calculating the distance between the UWB tag and the UWB base station according to the data interaction time;
and calculating the position of the user according to the distance between the UWB tag and each UWB base station.
3. The method for controlling the size of a projection screen according to claim 1, wherein determining the viewing distance between the user and the projection screen according to the user position comprises:
determining a man-machine distance between a user of the terminal equipment and the projection equipment in a preset direction according to the user position; the preset direction is the projection direction of the projection equipment;
calculating the viewing distance between the user and a projection screen according to the projection distance and the man-machine distance;
the projection distance is the distance between the projection equipment and the projection screen in the preset direction.
4. The method for controlling the projection screen size according to claim 1, wherein determining the target projection screen size according to the viewing distance comprises:
determining a target distance interval where the viewing distance is located;
and determining the target projection picture size corresponding to the target distance interval according to the corresponding relation between the distance interval and the projection picture size.
5. The method for controlling the projection screen size according to claim 1, wherein determining the target projection screen size according to the viewing distance comprises:
calculating the size of the target projection picture corresponding to the viewing distance according to a preset rule; wherein the preset rule is that the viewing distance is positively correlated with the size of the target projection picture.
6. The method for controlling the size of a projection screen according to claim 1, further comprising, after determining the user position according to the data interaction time:
and adjusting the projection position of the projection equipment on the projection screen according to the user position.
7. The method for controlling the size of a projection screen according to any one of claims 1 to 6, after determining the position of the user according to the data interaction time, further comprising:
determining a listening distance between the user and an audio playing device according to the user position, and determining a target volume according to the listening distance;
and adjusting the current volume of the audio playing device according to the target volume.
8. A control apparatus for a projection screen size, which is applied to a projection apparatus including at least two UWB base stations, the control apparatus for a projection screen size comprising:
the position determining module is used for carrying out data interaction with the UWB tag by utilizing the UWB base station and determining the position of a user according to data interaction time; the UWB tag is arranged on a terminal device, and the user position is the position of a user carrying the terminal device;
the size determining module is used for determining the viewing distance between the user and a projection screen according to the position of the user and determining the size of a target projection picture according to the viewing distance;
and the size adjusting module is used for projecting to the projection screen according to the size of the target projection picture.
9. A projection apparatus comprising at least two UWB base stations, a memory in which a computer program is stored, and a processor which, when calling the computer program in the memory, realizes the steps of the method for controlling the size of a projection screen according to any one of claims 1 to 7.
10. A storage medium storing computer-executable instructions, which when loaded and executed by a processor, implement the steps of the method for controlling the size of a projection screen according to any one of claims 1 to 7.
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| CN202211335337.9A CN115695755A (en) | 2022-10-28 | 2022-10-28 | Projection picture size control method and device, projection equipment and storage medium |
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| CN202211335337.9A CN115695755A (en) | 2022-10-28 | 2022-10-28 | Projection picture size control method and device, projection equipment and storage medium |
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| CN106990650A (en) * | 2016-01-20 | 2017-07-28 | 中兴通讯股份有限公司 | The adjusting method and device of projected picture |
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