CN117135326A - Projection picture processing method, apparatus, electronic device and storage medium - Google Patents
Projection picture processing method, apparatus, electronic device and storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/14—Systems for determining direction or deviation from predetermined direction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0284—Relative positioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3191—Testing thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/025—Services making use of location information using location based information parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/029—Location-based management or tracking services
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Abstract
The application discloses a projection picture processing method, a projection picture processing device, electronic equipment and a storage medium; according to the method, distance information and/or angle information between the first UWB module and the second UWB module can be obtained; determining whether the relative position between the first UWB module and the second UWB module is changed according to the distance information and/or the angle information of the current moment and the distance information and/or the angle information of the previous moment; if the relative position changes, the projection screen is corrected based on the distance information and/or the angle information. According to the application, the UWB module is used for measuring the distance information and/or the angle information between the projector and the projection picture in real time, so that the UWB module can efficiently and accurately measure the information; therefore, when the position of the projector is changed, the efficiency and the accuracy of the projection picture correction can be improved.
Description
Technical Field
The present application relates to the field of wireless communications technologies, and in particular, to a method and apparatus for processing a projection image, an electronic device, and a storage medium.
Background
The projector needs to project an image onto a curtain or a wall surface to be displayed so as to form a projection picture, and the projector usually utilizes a camera to identify the position of the curtain and then automatically aligns the projection picture with the curtain (projection picture correction); however, the view angle range of the camera is limited, if the curtain exceeds the range of the camera, the camera cannot know the position of the curtain, and the function of aligning the projection picture cannot be performed; in addition, if the curtain does not have identifiable frames such as black edges, the camera can not finish the position judgment of the curtain. For projection pictures without a curtain, a distance sensor and a camera are needed to acquire environmental information, and correction is performed after three-dimensional information of the environment is acquired, so that more hardware devices are needed.
Therefore, the efficiency and accuracy of the current projection screen correction are low.
Disclosure of Invention
The application provides a projection picture processing method, a device, electronic equipment and a storage medium, which can improve the efficiency and accuracy of projection picture correction when the position of a projector is changed.
The application provides a projection picture processing method, which is suitable for a projector, wherein the projector is provided with a first UWB module, and a second UWB module corresponds to the area where a projection picture projected by the projector is positioned, and the method comprises the following steps:
acquiring distance information and/or angle information between a first UWB module and a second UWB module;
determining whether the relative position between the first UWB module and the second UWB module is changed according to the distance information and/or the angle information of the current moment and the distance information and/or the angle information of the previous moment;
if the relative position changes, the projection screen is corrected based on the distance information and/or the angle information.
The application also provides a projection picture processing device, which is suitable for a projector, wherein the projector is provided with a first UWB module, and a second UWB module corresponds to the area where the projection picture projected by the projector is positioned, and the device comprises:
the acquisition unit is used for acquiring distance information and/or angle information between the first UWB module and the second UWB module;
A determining unit for determining whether the relative position between the first UWB module and the second UWB module is changed according to the distance information and/or the angle information of the current moment and the distance information and/or the angle information of the previous moment;
and a correction unit for correcting the projection screen based on the distance information and/or the angle information if the relative position is changed.
In some embodiments, the angle information is an arrival angle of the first measurement signal when the second UWB module receives the first measurement signal sent by the first UWB module, and the obtaining unit is specifically configured to:
transmitting a first measurement signal to a second UWB module;
and receiving a measurement response signal sent by the second UWB module, wherein the measurement response signal carries angle information.
In some embodiments, the obtaining unit is specifically configured to:
transmitting a positioning request to the second UWB module, wherein the positioning request comprises a target field for requesting the second UWB module to report angle information;
receiving a positioning request response sent by a second UWB module;
and when the positioning request response indicates the second UWB module to determine to report the angle information, sending a first measurement signal to the second UWB module.
In some embodiments, the obtaining unit is specifically configured to:
acquiring a random number seed, wherein the random number seed is the same as the random number seed in the second UWB module;
Scrambling the first measurement signal by using a target time stamp to obtain a first measurement signal scrambled by the target time stamp, wherein the target time stamp is generated by a random number seed;
when the positioning request response indicates the second UWB module to determine reporting angle information, a first measurement signal scrambled by a target time stamp is sent to the second UWB module;
the measuring response signal corresponding to the first measuring signal scrambled by the target time stamp is the measuring response signal scrambled by the target time stamp, and distance information between the first UWB module and the second UWB module is obtained, comprising:
determining a time difference between the transmission target time-stamp scrambled first measurement signal and the reception target time-stamp scrambled measurement response signal;
and determining distance information between the first UWB module and the second UWB module according to the time difference.
In some embodiments, the second UWB module supports a multi-antenna array, the value of the target field is of a boolean value type, and the boolean value type is used for indicating whether the second UWB module reports the reporting angle information;
and/or, the value of the target field is in a numerical value type, and the numerical value is used for indicating the second UWB module to report the average value of the angle information corresponding to each array in the multi-antenna array, or report the angle information not to report.
In some embodiments, the second UWB module comprises UWB module p2 and UWB module p3, and the angle information comprises a first angle between the first UWB module and UWB module p2 and a second angle between the first UWB module and UWB module p 3; the determining unit is specifically configured to:
determining a current angle difference at the current moment according to the first angle at the current moment and the second angle at the current moment;
determining a previous angle difference at a previous moment according to the first angle at the previous moment and the second angle at the previous moment;
and determining whether the relative position between the first UWB module and the second UWB module is changed according to the current angle difference and the previous angle difference.
In some embodiments, the second UWB module further comprises UWB module p1, UWB module p2, and UWB module p3, the connection between UWB module p1 and UWB module p2 being perpendicular to the connection between UWB module p2 and UWB module p 3.
In some embodiments, the distance information includes a first distance from UWB module p1, a second distance from UWB module p2, and a third distance from UWB module p3 for the first positioning module; the determining unit is specifically configured to:
comparing the first distance between the current time and the previous time, the second distance between the current time and the previous time and the third distance between the current time and the previous time to obtain a comparison result;
Based on the comparison, a change in relative position between the first UWB module and the second UWB module is determined.
In some embodiments, the correction unit is specifically configured to:
acquiring a first coordinate position of the UWB module p1, a second coordinate position of the UWB module p2 and a third coordinate position of the UWB module p 3;
determining a coordinate position of at least one target point according to the first coordinate position, the second coordinate position and the third coordinate position;
and correcting the projection picture according to the first distance, the second distance, the third distance and the position coordinates of the target point at the current moment.
In some embodiments, the angle information is an arrival angle of the second measurement signal when the first UWB module receives the second measurement signal sent by the second UWB module, and the obtaining unit is specifically configured to:
determining a receiving time, wherein the receiving time is the time for each array in the multi-antenna array of the first UWB module to receive the second measurement signal;
and determining the arrival angle of the second measurement signal according to the receiving time.
The application also provides an electronic device, which comprises a memory and a processor, wherein the memory stores a plurality of instructions; the processor loads instructions from the memory to execute the steps in any of the projection picture processing methods provided by the application.
The present application also provides a computer readable storage medium storing a plurality of instructions adapted to be loaded by a processor to perform the steps of any of the projection screen processing methods provided by the present application.
In the application, the distance information and/or the angle information between the projector and the UWB module corresponding to the projection picture can be measured in real time; determining whether a relative position between the first UWB module and the second UWB module is changed based on the distance information and/or the angle information of the previous time and the current time, thereby determining whether the position of the projector is changed; the UWB module has high-efficiency and high-precision positioning capability; therefore, when the position of the projector is changed, the projection picture can be quickly and accurately corrected, and the correction efficiency and accuracy of the projection picture are improved.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1a is a schematic view of a projection screen processing method according to the present application;
FIG. 1b is a schematic flow chart of a method for processing a projection screen according to the present application;
FIG. 1c is a schematic diagram of determining angle information according to the present application;
FIG. 1d is a schematic view of a projection screen processing method according to another embodiment of the present application;
FIG. 1e is a schematic illustration of a determination of distance between UWB modules provided by the present application;
FIG. 1f is a schematic illustration of another determination of distance between UWB modules provided by the present application;
FIG. 2 is a schematic diagram of a projection image processing apparatus according to the present application;
fig. 3 is a schematic structural diagram of an electronic device provided by the present application.
Detailed Description
The following description of the embodiments of the present application will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the application are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
The application provides a projection picture processing method, a projection picture processing device, electronic equipment and a storage medium.
The projection screen processing device may be integrated in an electronic device, which may be a terminal, a server, or other devices. The terminal can be a projector, an intelligent television, a laser television, a mobile phone, a tablet personal computer, intelligent Bluetooth equipment, a notebook computer, a desktop computer and other equipment; the server may be a single server or a server cluster composed of a plurality of servers. In some embodiments, the server may also be implemented in the form of a terminal.
In some embodiments, the projection screen processing apparatus may be integrated into a plurality of electronic devices, for example, the projection screen processing apparatus may be integrated into a projector and a plurality of Ultra Wide Band (UWB) modules, and the projection screen processing method of the present application is jointly implemented by the projector and the UWB modules.
For example, as shown in fig. 1a, a schematic view of a scene of the projection screen processing method provided in this embodiment includes a projector and a UWB module corresponding to an area where the projection screen is located. Wherein the UWB module installed in the projector may be referred to as a first UWB module; the UWB module corresponding to the area where the projection screen is located may be installed in a curtain, or may be installed on a wall, and may be referred to as a second UWB module. Alternatively, the first UWB module and the second UWB module may support multiple antenna arrays.
In some embodiments, the second UWB module further comprises UWB module p1, UWB module p2, and UWB module p3, the connection between UWB module p1 and UWB module p2 being perpendicular to the connection between UWB module p2 and UWB module p 3. As shown in fig. 1a, the first UWB module is P4, P4 (1) represents P4 at the previous time, and P4 (2) represents P4 at the current time. The order and position of the UWB modules p1, p2 and p3 on the curtain or wall surface are not limited.
In some embodiments, as shown in fig. 1b, the second UWB module may also include UWB module p5.
In some embodiments, the projector may obtain distance information and/or angle information between the first UWB module and the second UWB module; determining whether the relative position between the first UWB module and the second UWB module is changed according to the distance information and/or the angle information of the current moment and the distance information and/or the angle information of the previous moment; if the relative position changes, the projection screen is corrected based on the distance information and/or the angle information.
In this embodiment, distance information and/or angle information between the projector and the UWB module corresponding to the projection screen may be measured in real time; determining whether a relative position between the first UWB module and the second UWB module is changed based on the distance information and/or the angle information of the previous time and the current time, thereby determining whether the position of the projector is changed; the UWB module has high-efficiency and high-precision positioning capability; therefore, when the position of the projector is changed, the projection picture can be quickly and accurately corrected, and the correction efficiency and accuracy of the projection picture are improved.
The following will describe in detail. The numbers of the following examples are not intended to limit the preferred order of the examples.
In this embodiment, a projection screen processing method is provided, as shown in fig. 1c, and the specific flow of the projection screen processing method may be as follows:
110. distance information and/or angle information between the first UWB module and the second UWB module are acquired.
Wherein the distance information and/or the angle information may be used to represent the relative position between the projector and the projected screen.
The angle information may be an arrival angle of the first measurement signal when the second UWB module receives the first measurement signal transmitted by the first UWB module, and the arrival angle may include an incident transverse angle and an incident longitudinal angle. And/or the angle information is the arrival angle of the second measurement signal when the first UWB module receives the second measurement signal sent by the second UWB module. For example, the second UWB module includes UWB module p2 and UWB module p3, and the angle information includes a first angle between the first UWB module and UWB module p2 and a second angle between the first UWB module and UWB module p 3. The first angle may be an angle of arrival of the first measurement signal when the UWB module p2 receives the first measurement signal, and the second angle may be an angle of arrival of the first measurement signal when the UWB module p3 receives the first measurement signal.
In some embodiments, the angle information is an arrival angle of the first measurement signal when the second UWB module receives the first measurement signal sent by the first UWB module, and the obtaining the angle information between the first UWB module and the second UWB module may include, but is not limited to, the following steps:
1) The first UWB module sends a first measurement signal to the second UWB module; accordingly, the second UWB module receives the first measurement signal transmitted by the first UWB module.
Wherein the measurement signal may be an ultra wideband pulse.
In some embodiments, the second UWB module may actively report the angle information, so that the problem that the angle cannot be measured under certain specific conditions may be avoided. In some embodiments, whether the second UWB module reports angle information may be determined based on whether the first UWB module itself supports angle measurements (e.g., TOA (Time of Arrival), TDOA (Time Difference of Arrival), and AOA (Angel of Arrival)), and whether the first UWB module requests the second UWB module to report angle information on its own initiative. For example, if the first UWB module does not support angle measurement, the second UWB module may report angle information, where the reporting angle information may be set to enable, and the higher layer signaling macaoaaenable itself is set to true, and then the angle information may be returned in the returned measurement response signal. Otherwise, if the first UWB module supports angle measurement, the second UWB module may or may not report the angle information.
Optionally, when the first UWB module requests the second UWB module to actively report the angle information, the sending the first measurement signal to the second UWB module may include the following steps:
(1) the first UWB module may send a positioning request to the second UWB module, where the positioning request includes a target field for requesting the second UWB module to report angle information. Accordingly, the second UWB module receives the positioning request.
The location request datarequestranging descriptor may include a plurality of fields, and different fields may be used to carry different information. For example, the target field may carry information requesting the second UWB module to determine the reporting angle; the target field may be 1 bit, 2 bits, etc.
In some embodiments, the second UWB module supports a multi-antenna array, the value of the target field is Boolean, and the Boolean value is used to indicate whether the second UWB module reports the reporting angle information; for example, TRUE may be indicated to indicate reporting angle information, and FALSE may indicate not reporting angle information.
And/or, the value of the target field is a numerical value type energy, and the numerical value is used for indicating the second UWB module to report the average value of the angle information corresponding to each array in the multi-antenna array, or report the non-reporting angle information, for example, indicating that reporting the FALSE indicates not reporting the angle information.
In some embodiments, the first UWB module and each of the second UWB modules may be pre-paired by an air interface protocol prior to transmitting the location request.
(2) And receiving a positioning request response sent by the second UWB module.
(3) And when the positioning request response indicates the second UWB module to determine to report the angle information, sending a first measurement signal to the second UWB module.
In some embodiments, transmitting the first measurement signal to the second UWB module may include the steps of: acquiring a random number seed, wherein the random number seed is the same as the random number seed in the second UWB module; scrambling the first measurement signal by using a target time stamp to obtain a first measurement signal scrambled by the target time stamp, wherein the target time stamp is generated by a random number seed; wherein the target timestamp may be scrambled at any position of the first measurement signal, e.g. may be scrambled at a first symbol position; when the second UWB module receives the first measurement signal, a target timestamp may be extracted from the first symbol location. And when the positioning request response indicates the second UWB module to determine the reporting angle information, sending a first measurement signal scrambled by the target time stamp to the second UWB module.
For example, after the first UWB module and each second UWB module pair successfully, both may save the same random number generation seed. Both parties can generate a pseudorandom number long code sequence of the same length using the same random number generation seed, and the target timestamp can be any pseudorandom number in the sequence. The sequence may generate a time stamp sequence (STS, scrambled timestamp sequence, scrambled time stamp sequence) by scrambling in a corresponding location field of the data frame when the data frame (e.g., the first measurement signal) is transmitted by the physical layer, and the time stamp sequence may implement marking (tmmaker information) of the data frame when the data frame is consecutively transmitted by the physical layer a plurality of times. Alternatively, the values in the sequence of time stamps may be incremented until the higher layer of either the first UWB module or the second UWB module indicates to cease air interface interactions.
Alternatively, to obtain accurate distance information, a higher time resolution may be configured for the STS to enable the physical layer to provide the ability to resolve short-spaced narrowband pulses.
2) The second UWB module sends a measurement response signal to the first UWB module after determining the arrival angle of the first measurement signal when receiving the first measurement signal sent by the first UWB module; correspondingly, the first UWB module receives a measurement response signal sent by the second UWB module, and the measurement response signal carries angle information.
In some embodiments, the second UWB module supports a multi-antenna array, and the reception time of the first measurement signal by each of the plurality of antenna arrays may be determined; and determining angle information according to the receiving time.
For example, the second UWB module may support a two-dimensional antenna array, and the incident lateral angle and the incident longitudinal angle at which the first UWB module transmits the first measurement signal may be calculated by a plurality of antenna arrays in a horizontal or vertical direction. As shown in fig. 1d, the horizontal distance between the first and second array elements is d, and the corresponding receiving time when the first measurement signal arrives through the incident paths path1 and path2 is determined, so as to obtain the time difference between the first measurement signal received by the first and second array elements, and the distance corresponding to the time difference is δ, and the incident lateral angles of the path1 and path2 are sin θ=δ/d. Similarly, the incident longitudinal angle can be obtained by measuring the incident angle of the antenna array in the vertical direction. Alternatively, the measured incident transverse angles of the plurality of horizontal direction arrays may be averaged to obtain an average value; the average value can also be obtained by averaging the measured incidence longitudinal angles of a plurality of vertical direction arrays.
Wherein the random number seed in the second UWB module is the same as the random number seed in the first UWB module, so the second UWB module can employ the target time-stamped scrambled measurement response signal generated by the random number seed.
In some embodiments, the angle information is an arrival angle of a second measurement signal when the first UWB module receives the second measurement signal sent by the second UWB module, the first positioning module supports a multi-antenna array, and the obtaining the angle information between the first UWB module and the second UWB module includes: determining a receiving time, wherein the receiving time is the time for each array in the multi-antenna array of the first UWB module to receive the second measurement signal; and determining the arrival angle of the second measurement signal according to the receiving time. The specific implementation manner may refer to the determination of the arrival angle of the first measurement signal, which is not described herein.
In some embodiments, to achieve more accurate positioning capabilities (positioning includes determining angle information and determining distance information between UWB modules), the ability of each array in a multi-antenna array to have an individual extraction time stamp may be supported. For example, the cells RxRangingCounter and TxRangingCounter in RangingReportDescriptor IE carried by the first measurement signal MCPS-DATA may support multiple antenna extension bits. The following table shows:
The time unit count may refer to a time stamp that may be extracted from a measurement signal or a scrambling in a measurement response signal received by each of the multiple antenna arrays.
In some embodiments, obtaining distance information between the first UWB module and the second UWB module may include, but is not limited to: the measuring response signal corresponding to the measuring signal scrambled by the target time stamp is the measuring response signal scrambled by the target time stamp, and the time difference between the measuring signal scrambled by the target time stamp and the measuring response signal scrambled by the target time stamp is determined; and determining distance information between the first UWB module and the second UWB module according to the time difference. The second UWB module includes UWB module p1, UWB module p2 and UWB module p3, so that a first distance of the first positioning module from UWB module p1, a second distance from UWB module p2 and a third distance from UWB module p3 can be obtained.
For example, a time stamp may be extracted from a measurement signal or a measurement response signal through air interface interaction of the first UWB module and the second UWB module, and a time difference may be calculated according to the time stamp (Tmarker information), and then a transmission time Tprop of the measurement signal or the measurement response signal may be calculated, where the transmission time is multiplied by the speed of light to obtain the distance. The calculation of the transmission time may support a variety of modes, such as a single-sided two-way measurement (SS-TWR) mode, a double-sided two-way measurement (DS-TWR) mode, and a three-message-mode double-sided measurement (3 Msg-DS-TWR).
Wherein, the single-side two-way measurement (SS-TWR) mode means that the first UWB module transmits a measurement signal to the paired second UWB module, and the second UWB module can demodulate the measurement message; after receiving the measurement signal, a measurement response signal may be transmitted to the first UWB module over the air interface. In the transmitted measurement response signals, the second UWB module carries the time difference Treplay between the received measurement signals and the transmitted measurement response signals measured by the second UWB module to the first UWB module. The first UWB module calculates a around time difference through Tmarker information of the own receiving and transmitting signal, and the interaction process is shown in fig. 1 e. In this mode, the transmission time is tprop=1/2 (around-reply). It should be noted that, the transmission time may take into account an internal time error caused by Radio Frequency (RF), baseband and link, and compensate or subtract.
The double-sided two-way measurement (DS-TWR) mode can reduce errors brought by equipment and obtain higher precision. The two-way measurement indicates that the first UWB module and the second UWB module respectively send a measurement signal once, and then the transmission time is calculated. The method can be regarded as two single-side two-way measurement (SS-TWR) modes, namely, a first UWB module sends a measurement signal, and a second UWB module performs corresponding measurement and sends a measurement response signal; the second UWB module sends a measurement signal, and the first UWB module carries out corresponding measurement and sends a measurement response signal; the interaction process is shown in fig. 1 f. The transmission time is tprop= (around 1 x around 2-Treply1 x around 2)/(around 1+ around 2+ around 1+ around 2) is obtained.
The three-message mode double-side measurement (3 Msg-DS-TWR) is a further optimization of DS-TWR, after the first UWB module sends the measurement signal, the second UWB module receives the measurement signal to measure, and immediately sends the measurement signal to measure the transmission time.
120. And determining whether the relative position between the first UWB module and the second UWB module is changed or not according to the distance information and/or the angle information of the current moment and the distance information and/or the angle information of the previous moment.
The current time may refer to a current system time; the former time and the current time can have a certain time interval, and the size of the time interval can be configured according to the actual application situation.
In some embodiments, the current time angle information (which may be the angle of arrival of the first measurement signal and/or the angle of arrival of the second signal) between the first UWB module and any of the second UWB modules may be compared with the angle information of the previous time to determine whether the relative position has changed; for example, an angle difference of the arrival angles at two times is calculated, and when the angle difference is greater than an angle difference threshold value, a relative position change is determined. The angle difference threshold may be set in a customized manner according to the actual application situation, for example, may be 5 degrees. That is, if the relative position between any one of the first UWB module and the second UWB module is changed, it can be considered that the position of the projector is changed. For example, as shown in fig. 1b, assuming that the second UWB module further includes a UWB module p5, it may be determined whether the relative position between the first UWB module and p5 is changed based on p 5.
The arrival angle comprises an incidence transverse angle and an incidence longitudinal angle; the transverse angle difference between the incident transverse angle at the current moment and the incident transverse angle at the previous moment can be calculated, the longitudinal angle difference between the incident longitudinal angle at the current moment and the incident longitudinal angle at the previous moment can also be calculated, and when any value of the transverse angle difference and the longitudinal angle difference exceeds the corresponding angle difference threshold value, the angle difference is considered to be larger than the angle difference threshold value. The angle information is actively reported by the second UWB module, so that the situation that the position of the projector is not changed due to the fact that the angle of the measured response signal reaching the first UWB module and the distance between the first UWB module and the second UWB module are not changed when the projector moves to certain specific angles can be avoided.
In some embodiments, the relative position between at least two of the first UWB module and the second UWB module changes to account for the change in the position of the projector to perform subsequent correction of the projected image, and so on. For example, as shown in fig. 1a, it may be determined whether the relative position of the first UWB module with respect to the UWB module P2 and the UWB module P3 is changed, based on the UWB module P2 and the UWB module P3. Specifically, the second UWB module includes a UWB module p2 and a UWB module p3, and the angle information includes a first angle between the first UWB module and the UWB module p2 and a second angle between the first UWB module and the UWB module p 3; determining whether the relative position between the first UWB module and the second UWB module has changed based on the angle information of the current time and the angle information of the previous time may include, but is not limited to:
And determining the current angle difference of the current moment according to the first angle of the current moment and the second angle of the current moment.
And determining a previous angle difference of the previous moment according to the first angle of the previous moment and the second angle of the previous moment.
And determining whether the relative position between the first UWB module and the second UWB module is changed according to the current angle difference and the previous angle difference. Specifically, the current angle difference and the previous angle difference can be compared, and if the values of the two angle differences are not equal, the relative position change can be determined; for another example, a target angle difference between the current angle difference and the previous angle difference may be obtained, and when the target angle difference is greater than the angle difference threshold, a relative position change is determined.
In some embodiments, as shown in fig. 1a, θ1 and θ2 may be calculated from the first angle and the second angle, and whether the relative position between the first UWB module and the second UWB module changes may be determined from the θ1 and θ2.
In some embodiments, the angle of arrival of the first measurement signal when the second UWB module receives the first measurement signal transmitted by the first UWB module and the angle of arrival of the second measurement signal when the first UWB module receives the second measurement signal transmitted by the second UWB module may also be combined to determine whether the relative position between the first UWB module and the second UWB module is changed.
In some embodiments, the distance information includes a first distance from UWB module p1, a second distance from UWB module p2, and a third distance from UWB module p3 for the first positioning module; the first distance between the current time and the previous time, the second distance between the current time and the previous time and the third distance between the current time and the previous time can be compared to obtain a comparison result; based on the comparison, a change in relative position between the first UWB module and the second UWB module is determined. Determining a relative position change, for example, when the value of any one of the first distance, the second distance, and the third distance is changed; alternatively, when the value of any two of the first distance, the second distance, and the third distance is changed, a relative position change is determined, and so on.
In some embodiments, whether the relative position between the first UWB module and the second UWB module is changed may be comprehensively determined according to the distance information and the angle information of the current time and the distance information and the angle information of the previous time. Reference may be made specifically to the above, and details are not repeated here.
130. Correcting the projected picture based on the distance information and/or the angle information if the relative position changes
In some embodiments, the projection picture and the curtain/wall four-point coordinates can be matched according to the distance information, the angle information and the mapping relation between the projector and the projection picture, so as to complete the correction of the projection picture.
In some embodiments, a first coordinate position of UWB module p1, a second coordinate position of UWB module p2, and a third coordinate position of UWB module p3 may be acquired; determining a coordinate position of at least one target point according to the first coordinate position, the second coordinate position and the third coordinate position; and correcting the projection picture according to the first distance, the second distance, the third distance and the position coordinates of the target point at the current moment.
For example, according to P4-P2, P2-P3 and P2-P1, the distance between the projector and the curtain/wall is obtained, P1, P2 and P3 correspond to vertex coordinates A, B, C, and according to A, B, C coordinates, D point position coordinates are obtained, so that four point position coordinates of the curtain/wall are obtained; and matching the projection picture with the four-point coordinates of the curtain/wall surface according to the distance (such as a first distance, a second distance and a third distance) between the projector and the curtain/wall surface, the position coordinates of the four points of the curtain/wall surface and the mapping relation between the projector and the projection picture, so as to finish the correction of the projection picture. Therefore, the angle and the distance between the first UWB module and the second UWB module are measured through the high-precision UWBUWB module, whether the position of the projector moves is then determined based on the angle and the distance, and the projection picture is corrected under the condition that the position moves, so that the calculation amount is less, and the efficiency of the projector for processing the projection picture is higher.
As can be seen from the above, the first UWB module in the projector can send a positioning request to the second UWB module corresponding to the projection picture, and request the second UWB module to actively report the angle information when the measurement signal sent by the first UWB module reaches the second UWB module; when a positioning request response returned by the second UWB module is received to indicate the second UWB module to determine reporting angle information, a measurement signal is sent to the second UWB module, and whether the relative position between the first UWB module and the second UWB module is changed is determined according to the angle information in the measurement response signal corresponding to the received measurement signal. By installing UWB modules in the projector and on the corresponding curtain or wall surface of the projection picture, the adoption of a camera to collect three-dimensional environment information for processing can be avoided, the information processing efficiency can be improved, and the problem that the angle cannot be measured under certain specific conditions can be avoided by actively reporting the angle information through the second UWB module, so that the position change of the projector is monitored in all directions; therefore, the efficiency and the accuracy of projection picture correction are improved.
In order to better implement the above method, the present application also provides a projection screen processing apparatus, which may be integrated in an electronic device in particular; for example, in the present embodiment, the method of the present application will be described in detail by taking the example that the projection screen processing apparatus is specifically integrated in the projector.
For example, as shown in fig. 2, the projection screen processing apparatus may include an acquisition unit 201, a determination unit 202, and a correction unit 203, as follows:
an obtaining unit 201, configured to obtain distance information and/or angle information between the first UWB module and the second UWB module;
a determining unit 202, configured to determine whether the relative position between the first UWB module and the second UWB module is changed according to the distance information and/or the angle information at the current time and the distance information and/or the angle information at the previous time;
and a correction unit 203 for correcting the projection screen based on the distance information and/or the angle information if the relative position is changed.
In some embodiments, the angle information is an arrival angle of the first measurement signal when the second UWB module receives the first measurement signal sent by the first UWB module, and the obtaining unit 201 is specifically configured to:
transmitting a first measurement signal to a second UWB module;
and receiving a measurement response signal sent by the second UWB module, wherein the measurement response signal carries angle information.
In some embodiments, the obtaining unit 201 is specifically configured to:
transmitting a positioning request to the second UWB module, wherein the positioning request comprises a target field for requesting the second UWB module to report angle information;
Receiving a positioning request response sent by a second UWB module;
and when the positioning request response indicates the second UWB module to determine to report the angle information, sending a first measurement signal to the second UWB module.
In some embodiments, the obtaining unit 201 is specifically configured to:
acquiring a random number seed, wherein the random number seed is the same as the random number seed in the second UWB module;
scrambling the first measurement signal by using a target time stamp to obtain a first measurement signal scrambled by the target time stamp, wherein the target time stamp is generated by a random number seed;
when the positioning request response indicates the second UWB module to determine reporting angle information, a first measurement signal scrambled by a target time stamp is sent to the second UWB module;
the measuring response signal corresponding to the first measuring signal scrambled by the target time stamp is the measuring response signal scrambled by the target time stamp, and distance information between the first UWB module and the second UWB module is obtained, comprising:
determining a time difference between the transmission target time-stamp scrambled first measurement signal and the reception target time-stamp scrambled measurement response signal;
and determining distance information between the first UWB module and the second UWB module according to the time difference.
In some embodiments, the second UWB module supports a multi-antenna array, the value of the target field is of a boolean value type, and the boolean value type is used for indicating whether the second UWB module reports the reporting angle information;
And/or, the value of the target field is in a numerical value type, and the numerical value is used for indicating the second UWB module to report the average value of the angle information corresponding to each array in the multi-antenna array, or report the angle information not to report.
In some embodiments, the second UWB module comprises UWB module p2 and UWB module p3, and the angle information comprises a first angle between the first UWB module and UWB module p2 and a second angle between the first UWB module and UWB module p 3; the determining unit 202 is specifically configured to:
determining a current angle difference at the current moment according to the first angle at the current moment and the second angle at the current moment;
determining a previous angle difference at a previous moment according to the first angle at the previous moment and the second angle at the previous moment;
and determining whether the relative position between the first UWB module and the second UWB module is changed according to the current angle difference and the previous angle difference.
In some embodiments, the second UWB module further comprises UWB module p1, UWB module p2, and UWB module p3, the connection between UWB module p1 and UWB module p2 being perpendicular to the connection between UWB module p2 and UWB module p 3.
In some embodiments, the distance information includes a first distance from UWB module p1, a second distance from UWB module p2, and a third distance from UWB module p3 for the first positioning module; the determining unit 202 is specifically configured to:
Comparing the first distance between the current time and the previous time, the second distance between the current time and the previous time and the third distance between the current time and the previous time to obtain a comparison result;
based on the comparison, a change in relative position between the first UWB module and the second UWB module is determined.
In some embodiments, the correction unit 203 is specifically configured to:
acquiring a first coordinate position of the UWB module p1, a second coordinate position of the UWB module p2 and a third coordinate position of the UWB module p 3;
determining a coordinate position of at least one target point according to the first coordinate position, the second coordinate position and the third coordinate position;
and correcting the projection picture according to the first distance, the second distance, the third distance and the position coordinates of the target point at the current moment.
In some embodiments, the angle information is an arrival angle of the second measurement signal when the first UWB module receives the second measurement signal sent by the second UWB module, and the obtaining unit 201 is specifically configured to:
determining a receiving time, wherein the receiving time is the time for each array in the multi-antenna array of the first UWB module to receive the second measurement signal;
and determining the arrival angle of the second measurement signal according to the receiving time.
In the implementation, each unit may be implemented as an independent entity, or may be implemented as the same entity or several entities in any combination, and the implementation of each unit may be referred to the foregoing method embodiment, which is not described herein again.
As can be seen from the above, the projection screen processing device of the present embodiment can measure the distance information and/or the angle information between the projector and the UWB module corresponding to the projection screen in real time; determining whether a relative position between the first UWB module and the second UWB module is changed based on the distance information and/or the angle information of the previous time and the current time, thereby determining whether the position of the projector is changed; the UWB module has high-efficiency and high-precision positioning capability; therefore, when the position of the projector is changed, the projection picture can be quickly and accurately corrected, and the correction efficiency and accuracy of the projection picture are improved.
The present application also provides an electronic device, in this embodiment, a detailed description will be given taking an example that the electronic device of this embodiment is a projector, for example, as shown in fig. 3, which shows a schematic structural diagram of the electronic device according to the present application, specifically:
the electronic device may include one or more processing cores 'processors 301, one or more computer-readable storage media's memory 302, a power supply 303, an input module 304, and a communication module 305, among other components. Those skilled in the art will appreciate that the electronic device structure shown in fig. 3 is not limiting of the electronic device and may include more or fewer components than shown, or may combine certain components, or may be arranged in different components. Wherein:
The processor 301 is a control center of the electronic device, connects various parts of the entire electronic device using various interfaces and lines, performs various functions of the electronic device and processes data by running or executing software programs and/or modules stored in the memory 302, and invoking data stored in the memory 302. In some embodiments, processor 301 may include one or more processing cores; in some embodiments, processor 301 may integrate an application processor that primarily processes operating systems, user interfaces, applications, etc., with a modem processor that primarily processes wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 301.
The memory 302 may be used to store software programs and modules, and the processor 301 executes various functional applications and data processing by executing the software programs and modules stored in the memory 302. The memory 302 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data created according to the use of the electronic device, etc. In addition, memory 302 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 302 may also include a memory controller to provide the processor 301 with access to the memory 302.
The electronic device also includes a power supply 303 that powers the various components, and in some embodiments, the power supply 303 may be logically connected to the processor 301 through a power management system to perform functions such as managing charging, discharging, and power consumption. The power supply 303 may also include one or more of any components, such as a direct current or alternating current power supply, a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator, and the like.
The electronic device may also include an input module 304, which input module 304 may be used to receive entered numeric or character information and to generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.
The electronic device may also include a communication module 305, and in some embodiments the communication module 305 may include a wireless module, through which the electronic device may wirelessly transmit over a short distance, thereby providing wireless broadband internet access to the user. For example, the communication module 305 may be used to assist a user in e-mail, browsing web pages, accessing streaming media, and the like.
Although not shown, the electronic device may further include a display unit or the like, which is not described herein. In particular, in this embodiment, the processor 301 in the electronic device loads executable files corresponding to the processes of one or more application programs into the memory 302 according to the following instructions, and the processor 301 executes the application programs stored in the memory 302, so as to implement various functions as follows:
acquiring distance information and/or angle information between a first UWB module and a second UWB module;
determining whether the relative position between the first UWB module and the second UWB module is changed according to the distance information and/or the angle information of the current moment and the distance information and/or the angle information of the previous moment;
if the relative position changes, the projection screen is corrected based on the distance information and/or the angle information.
The specific implementation of each operation above may be referred to the previous embodiments, and will not be described herein.
From the above, the electronic device can measure the distance information and/or angle information between the projector and the UWB module corresponding to the projection screen in real time; determining whether a relative position between the first UWB module and the second UWB module is changed based on the distance information and/or the angle information of the previous time and the current time, thereby determining whether the position of the projector is changed; the UWB module has high-efficiency and high-precision positioning capability; therefore, when the position of the projector is changed, the projection picture can be quickly and accurately corrected, and the correction efficiency and accuracy of the projection picture are improved.
Those of ordinary skill in the art will appreciate that all or a portion of the steps of the various methods of the above embodiments may be performed by instructions, or by instructions controlling associated hardware, which may be stored in a computer-readable storage medium and loaded and executed by a processor.
To this end, the present application provides a computer readable storage medium having stored therein a plurality of instructions capable of being loaded by a processor to perform the steps of any of the projection screen processing methods provided by the present application. For example, the instructions may perform the steps of:
acquiring distance information and/or angle information between a first UWB module and a second UWB module;
determining whether the relative position between the first UWB module and the second UWB module is changed according to the distance information and/or the angle information of the current moment and the distance information and/or the angle information of the previous moment;
if the relative position changes, the projection screen is corrected based on the distance information and/or the angle information.
Wherein the storage medium may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), magnetic or optical disk, and the like.
According to one aspect of the present application, there is provided a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer apparatus reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions so that the computer apparatus performs the projection screen processing method provided in the above-described embodiment.
The instructions stored in the storage medium can execute the steps in any projection screen processing method provided by the present application, so that the beneficial effects of any projection screen processing method provided by the present application can be achieved, and detailed descriptions of the foregoing embodiments are omitted herein.
The above description of the method, the device, the electronic device and the computer readable storage medium for processing a projection image provided by the present application has been provided in detail, and specific examples are applied to illustrate the principles and the embodiments of the present application, where the above description of the examples is only for helping to understand the method and the core idea of the present application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, the present description should not be construed as limiting the present application.
Claims (13)
1. The projection picture processing method is characterized by being applied to a projector, wherein the projector is provided with a first UWB module, and a second UWB module corresponds to an area where a projection picture projected by the projector is located, and the projection picture processing method comprises the following steps:
acquiring distance information and/or angle information between the first UWB module and the second UWB module;
determining whether the relative position between the first UWB module and the second UWB module is changed according to the distance information and/or the angle information at the current moment and the distance information and/or the angle information at the previous moment;
and correcting the projection picture based on the distance information and/or the angle information if the relative position is changed.
2. The projection screen processing method as claimed in claim 1, wherein the angle information is an arrival angle of the first measurement signal when the second UWB module receives the first measurement signal transmitted by the first UWB module, and the acquiring the angle information between the first UWB module and the second UWB module includes:
transmitting the first measurement signal to the second UWB module;
and receiving a measurement response signal sent by the second UWB module, wherein the measurement response signal carries the angle information.
3. The projection screen processing method of claim 2, wherein the transmitting the first measurement signal to the second UWB module comprises:
transmitting a positioning request to the second UWB module, wherein the positioning request comprises a target field for requesting the second UWB module to report angle information;
receiving a positioning request response sent by the second UWB module;
and when the positioning request response indicates the second UWB module to determine reporting angle information, the first measurement signal is sent to the second UWB module.
4. The projection screen processing method of claim 3, wherein the transmitting the first measurement signal to the second UWB module when the positioning request response indicates that the second UWB module determines to report angle information, comprises:
acquiring a random number seed, wherein the random number seed is the same as the random number seed in the second UWB module;
scrambling the first measurement signal by using a target time stamp to obtain a first measurement signal scrambled by the target time stamp, wherein the target time stamp is generated by the random number seed;
when the positioning request response indicates the second UWB module to determine reporting angle information, sending a first measurement signal scrambled by the target time stamp to the second UWB module;
The measurement response signal corresponding to the first measurement signal scrambled by the target time stamp is the measurement response signal scrambled by the target time stamp, and the obtaining the distance information between the first UWB module and the second UWB module includes:
determining a time difference between transmitting the target time-stamped scrambled first measurement signal and receiving the target time-stamped scrambled measurement response signal;
and determining distance information between the first UWB module and the second UWB module according to the time difference.
5. The projection screen processing method as claimed in claim 3, wherein the second UWB module supports a multi-antenna array, and the value of the target field is of a boolean value type, and the boolean value type is used for indicating whether the second UWB module reports the angle information;
and/or the value of the target field is a numerical value type, and the numerical value is used for indicating the second UWB module to report the average value of the angle information corresponding to each array in the multi-antenna array, or report the angle information not reported.
6. The projection screen processing method according to claim 1, wherein the second UWB module includes a UWB module p2 and a UWB module p3, and the angle information includes a first angle between the first UWB module and the UWB module p2 and a second angle between the first UWB module and the UWB module p 3;
The determining whether the relative position between the first UWB module and the second UWB module is changed according to the angle information of the current time and the angle information of the previous time includes:
determining a current angle difference of the current moment according to the first angle of the current moment and the second angle of the current moment;
determining a previous angle difference of the previous moment according to the first angle of the previous moment and the second angle of the previous moment;
and determining whether the relative position between the first UWB module and the second UWB module is changed according to the current angle difference and the previous angle difference.
7. The projection screen processing method according to claim 1, wherein the second UWB module further includes a UWB module p1, a UWB module p2, and a UWB module p3, and a line between the UWB module p1 and the UWB module p2 is perpendicular to a line between the UWB module p2 and the UWB module p 3.
8. The projection screen processing method of claim 7, wherein the distance information includes a first distance from the UWB module p1, a second distance from the UWB module p2, and a third distance from the UWB module p 3;
the determining whether the relative position between the first UWB module and the second UWB module is changed according to the distance information at the current time and the distance information at the previous time includes:
Comparing the first distance between the current time and the previous time, the second distance between the current time and the previous time and the third distance between the current time and the previous time to obtain a comparison result;
based on the comparison, a change in relative position between the first UWB module and the second UWB module is determined.
9. The projection screen processing method of claim 8, wherein the correcting the projection screen based on the distance information comprises:
acquiring a first coordinate position of the UWB module p1, a second coordinate position of the UWB module p2 and a third coordinate position of the UWB module p 3;
determining a coordinate position of at least one target point according to the first coordinate position, the second coordinate position and the third coordinate position;
and correcting the projection picture according to the first distance, the second distance, the third distance and the position coordinates of the target point at the current moment.
10. The projection screen processing method of claim 1, wherein the angle information is an arrival angle of a second measurement signal transmitted by the second UWB module when the first UWB module receives the second measurement signal, the first positioning module supports a multi-antenna array, and the acquiring the angle information between the first UWB module and the second UWB module includes:
Determining a receiving time, wherein the receiving time is the time for each array in the multi-antenna array of the first UWB module to receive the second measurement signal;
and determining the arrival angle of the second measurement signal according to the receiving time.
11. The utility model provides a projection picture processing apparatus which characterized in that is applicable to the projecting apparatus, there is first UWB module in the projecting apparatus, the projecting apparatus projection picture place region corresponds to the second UWB module, includes:
the acquisition unit is used for acquiring distance information and/or angle information between the first UWB module and the second UWB module;
a determining unit, configured to determine whether a relative position between the first UWB module and the second UWB module is changed according to the distance information and/or the angle information at the current time and the distance information and/or the angle information at the previous time;
and the correction unit is used for correcting the projection picture based on the distance information and/or the angle information if the relative position changes.
12. An electronic device comprising a processor and a memory, the memory storing a plurality of instructions; the processor loads instructions from the memory to perform the steps in the projection screen processing method of any of claims 1 to 10.
13. A computer readable storage medium storing a plurality of instructions adapted to be loaded by a processor to perform the steps of the projection screen processing method of any of claims 1 to 10.
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