WO2020077968A1 - 一种投影装置及其投影图像矫正方法和计算机存储介质 - Google Patents
一种投影装置及其投影图像矫正方法和计算机存储介质 Download PDFInfo
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- WO2020077968A1 WO2020077968A1 PCT/CN2019/083303 CN2019083303W WO2020077968A1 WO 2020077968 A1 WO2020077968 A1 WO 2020077968A1 CN 2019083303 W CN2019083303 W CN 2019083303W WO 2020077968 A1 WO2020077968 A1 WO 2020077968A1
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- projection
- display surface
- projection display
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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]
- H04N9/3179—Video signal processing therefor
- H04N9/3185—Geometric adjustment, e.g. keystone or convergence
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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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- the present invention relates to the technical field of projection, and in particular, the present invention relates to a projection device, a method for correcting a projected image, and a computer storage medium.
- the projection image of the projection device will be deformed to different degrees according to the change of the deflection angle of the projection device relative to the projection plane.
- the optical axis of the projection lens of the projection device is perpendicular to the projection plane, the projected image is a standard rectangle; however, the projection device often encounters a scene that cannot be projected frontally, and the projection display surface (such as a wall surface) needs to be diagonally oriented.
- the optical axis of the projection lens of the device is not perpendicular to the projection plane, the angle between the optical axis and the projection plane in the up-down direction, left-right direction, or up-down and left-right directions is not a right angle.
- Regular quadrilaterals require manual adjustment of the placement of the projection device so that the optical axis of the projection lens of the projection device is as perpendicular to the projection screen as possible to improve the distortion of the projected image and obtain a satisfactory image.
- the method of manually adjusting the placement state of the projection device is not convenient in some application scenarios, and the adjustment is time-consuming, and the adjustment effect sometimes cannot reach the optimal state.
- one aspect of the present invention provides a projection device, including:
- a distance measuring module configured to measure the distance difference between two different position points on the projection device and the projection display surface, wherein, when the projection device is directly facing the projection display surface, the difference The distance between the two position points of the projection display surface is the same;
- An angle calculation module configured to receive the distance difference and calculate and obtain tilt angle information of the projection device relative to the projection display surface according to the distance between the two location points and the distance difference;
- the correction module is configured to receive the tilt angle information and correct the projection image projected on the projection display surface according to the tilt angle information.
- the ranging module includes:
- At least two transmitters which are respectively arranged at different positions of the projection device, and used for transmitting at least two detection signals with a predetermined transmission speed to the projection display surface, wherein the projection device is directly opposite In the projection display surface, the distance between the at least two emitters and the projection display surface is the same;
- a receiver which is provided on the projection device in pair with the transmitter, is used to receive the detection signal reflected back from the projection display surface, and output time information for transmission to reception;
- the distance calculation module is used for receiving the time information, and calculating the distance difference between the two different position points and the projection display surface according to the difference between the time information output by different receivers and the predetermined transmission speed.
- Another aspect of the present invention provides a projection correction method for a projection device, including:
- the distance measuring step is used to measure the distance difference between two different position points on the projection device and the projection display surface, wherein, when the projection device is directly facing the projection display surface, the difference The distance between the two position points of the projection display surface is the same;
- An angle calculation step used to receive the distance difference and calculate and obtain tilt angle information of the projection device relative to the projection display surface according to the distance between the two position points and the distance difference;
- the correction step is used to receive the tilt angle information and correct the projection image projected on the projection display surface according to the tilt angle information.
- the distance measuring step includes:
- the transmission directions of the at least two detection signals are parallel to each other.
- the transmission direction of the detection signal is perpendicular to the side opposite to the projection display surface.
- two different location points are location points in the same horizontal direction to correct the left and right trapezoids; and / or
- the two different position points are the position points in the same vertical direction to correct the upper and lower trapezoids.
- the angle information between the projection device and the projection display surface is obtained by calculation using the trigonometric function principle.
- a further aspect of the present invention provides a projection device, including:
- Memory for storing processor executable instructions
- the processor is used to execute the instructions stored in the memory, so that the processor executes the aforementioned projection image correction method of the projection device.
- Yet another aspect of the present invention provides a computer storage medium on which a computer program is stored, and when the program is executed by a processor, the aforementioned projection image correction method of a projection device is realized.
- the projection device of the present invention obtains tilt angle information of the projection device with respect to the projection display surface by providing a distance measurement module and an angle calculation module; a correction module is used to receive the tilt angle information and pair The image projected on the projection display surface is corrected.
- the projection device of the present invention can realize automatic correction of the projection image of the projection device through the above-mentioned settings, without manually adjusting the position of the projection device, thereby projecting a rectangular projection image on the projection display surface, the correction accuracy is high, and the correction time is short. Correction can be achieved.
- FIG. 1A shows a structural block diagram of a projection device according to an embodiment of the present invention
- FIG. 1B shows a structural block diagram of a distance measuring module of a projection device according to an embodiment of the invention
- FIG. 2 shows a schematic diagram of a projection device according to an embodiment of the present invention directly facing a projection display surface
- FIG. 3 shows a schematic diagram of a projection device according to an embodiment of the present invention when it is tilted relative to a projection display surface
- FIG. 4 is a schematic diagram showing a tilt angle of a projection device according to an embodiment of the present invention with respect to a projection display surface;
- FIG. 5 shows a flowchart of a projection correction method of a projection device according to an embodiment of the present invention
- FIG. 6 shows a block diagram of a projection device according to another embodiment of the present invention.
- a projection device including:
- a distance measuring module configured to measure the distance difference between two different position points on the projection device and the projection display surface, wherein, when the projection device is directly facing the projection display surface, the difference The distance between the two position points of the projection display surface is the same;
- An angle calculation module configured to receive the distance difference and calculate and obtain tilt angle information of the projection device relative to the projection display surface according to the distance between the two location points and the distance difference;
- the correction module is configured to receive the tilt angle information and correct the projection image projected on the projection display surface according to the tilt angle information.
- the projection device of the present invention obtains tilt angle information of the projection device with respect to the projection display surface by providing a distance measurement module and an angle calculation module; a correction module is used to receive the tilt angle information and pair The image projected on the projection display surface is corrected.
- the projection device of the present invention can realize automatic correction of the projected image of the projection device through the above-mentioned settings, without manually adjusting the position of the projection device, thereby projecting a rectangular projection image on the projection display surface, with high correction accuracy and short time Correction can be achieved.
- the projection device 100 includes a distance measuring module 101 for measuring the distance difference between two different position points on the projection device and the projection display surface, wherein, in the projection When the device directly faces the projection display surface, the distance between the two different positions and the projection display surface is the same.
- the distance measuring module 101 includes: at least two transmitters 1011, which are respectively disposed at different positions of the projection device and are used to transmit to the projection display surface At least two detection signals having a predetermined transmission speed, wherein, when the projection device is facing the projection display surface, the distance between the at least two emitters and the projection display surface is the same.
- the ranging module receiver 1012 is paired with the transmitter 1011 on the projection device 100 for receiving the detection signal reflected back from the projection display surface and outputting Time information used for transmission to reception.
- the time information transmitted by the receiver is also different.
- the distance between the at least two transmitters 1011 and the projection display surface 202 is the same, that is, the detection signals received by the three receivers have the same time, and the output time information is the same, as shown in the figure As shown in FIG.
- the projection device 100 is inclined relative to the projection display surface 202, so that the distance between the three emitters 1011 and the projection display surface 202 that are originally the same distance from the projection display surface 202 becomes different, and the distance from left to right changes sequentially Large, then the time when the receiver receives the detection signal is also different, and different receivers will feedback different time information.
- the two different position points are the position points in the same horizontal direction to correct the left and right trapezoids to obtain a standard projection image, that is, the extension line of the connection line of these position points extends in the horizontal direction and is in contact with the projection device
- the side opposite to the projection display surface is parallel, for example, the location point is a location point on the top surface of the projection device, and the extension line connecting these location points is the side opposite to the projection device and the projection display surface Parallel, or the extension lines connecting these positions are located on the side opposite to the projection device and the projection display surface.
- the purpose of the above setting is to correct the left and right trapezoids, and the distance between the above position points is fixed.
- the two different position points are the position points in the same vertical direction to correct the upper and lower trapezoids to obtain a standard projection image, that is, to obtain a substantially rectangular projection image, to avoid distortion caused by stretching of the projection image .
- the extension line of the connecting lines of these position points extends in the vertical direction and is parallel to the side opposite to the projection device and the projection display surface, for example, the position point is a position point on the side of the projection device,
- the extension lines connecting the position points are parallel to the side opposite the projection device and the projection display surface, or the extension lines connecting the position points are located on the side opposite the projection device and the projection display surface Inside.
- a transmitter and a receiver are provided at each of the location points to measure the difference in distance between the two different location points and the projection display surface.
- the transmitter and receiver may be any suitable type of transmitter and receiver, for example, the transmitter includes an infrared transmitter, and the receiver includes an infrared receiver; or, the transmitter includes acoustic wave transmission Receiver, the receiver includes an acoustic wave receiver; or, the transmitter includes a laser transmitter, and the receiver includes a laser receiver.
- the above transmitters and receivers are set in pairs, and the number of transmitters and receivers can be reasonably selected according to the actual measurement requirements, for example, 3 transmitters and 3 receivers, 4 transmitters and 4 receivers, etc. .
- Three transmitters and three receivers may be provided on the top surface of the projection device adjacent to the projection display surface, and the three transmitters are arranged at equal intervals in the horizontal direction, as shown in FIGS. 2 and 3 .
- the distance measuring module includes at least two transmitters 1011, which are respectively disposed at different positions of the projection device, for example, the projection device 3 transmitters 1011 and 3 receivers (not shown) are provided on the top surface of the projector adjacent to the projection display surface, the transmitter 1011 is used to transmit a detection signal with a predetermined transmission speed to the projection display surface, wherein As shown in FIG. 2, when the projection device 100 is directly facing the projection display surface 202, the distance between the at least two transmitters 1011 and the projection display surface 202 is the same, that is, three receivers The time of the detection signal received is the same.
- the at least two transmitters are used to transmit detection signals whose transmission directions are parallel to each other, wherein preferably, the transmission direction of the detection signals is opposite to the projection display surface
- the angle between the sides is less than or equal to 90 °.
- the transmission direction of the detection signal is perpendicular to the side opposite to the projection display surface, so as to calculate the inclination angle of the projection device 100 relative to the projection display surface 202.
- the projection device 100 is inclined relative to the projection display surface 202. If no correction processing is performed, the projected image projected on the projection display surface will undergo left and right trapezoidal deformation, resulting in stretch deformation of the image, so It needs to be corrected so that the projected image is corrected into a rectangle.
- the ranging module 101 includes a distance calculation module 1013 for receiving the time information, and according to the difference between the time information output by different receivers and the predetermined transmission speed Calculate the difference between the distance between two different positions and the projection display surface. For example, as shown in FIG. 1B, the ranging module 101 includes a distance calculation module 1013 for receiving the time information, and according to the difference between the time information output by different receivers and the predetermined transmission speed Calculate the difference between the distance between two different positions and the projection display surface. For example, as shown in FIG.
- the receiver outputs its time information to the distance calculation module 1013, and the distance calculation
- the module 1013 calculates the time difference between the two, for example, the time difference between the two is 0.01s, and the time difference is multiplied by the transmission speed of the detection signal (such as infrared speed) and then divided by 2 to obtain the difference between the two transmitters and the projection display surface
- the difference in distance for example, results in a distance difference of 5 cm.
- the projection apparatus further includes an angle calculation module 102, configured to receive the distance difference and calculate based on the distance between the two location points and the distance difference Obtain angle information of the inclination of the projection device relative to the projection display surface.
- the distance between two position points is the distance D1 between two receivers or two transmitters.
- the distance D1 is fixed, for example, 5 cm.
- the specific distance is based on actual conditions. The measurement needs to be set reasonably.
- the above values are only examples and do not constitute a limitation.
- the angle between the detection signal and the side of the projection device can also be fixed.
- the distance difference D2 output from the received ranging module using the principle of trigonometric functions, Obtain the tilt angle of the projector relative to the projection display surface, for example 45 degrees.
- the aforementioned projection display surface may be any suitable surface, such as a wall surface, a projection screen, and the like.
- the projection apparatus further includes a correction module 103, configured to receive the tilt angle information and to project the projected image on the projection display surface 202 according to the tilt angle information Correction is performed to obtain a corrected rectangular projection image.
- a correction module 103 configured to receive the tilt angle information and to project the projected image on the projection display surface 202 according to the tilt angle information Correction is performed to obtain a corrected rectangular projection image.
- the correction module 103 may be a component that is well-known to those skilled in the art and can correct the projected image, and is not specifically limited herein.
- Data communication can be carried out between any of the aforementioned modules and devices in any suitable manner, for example, through various suitable wired connections or wireless connections.
- the complete projection device structure may also include other components, such as various optical systems used for projection, etc., which will not be repeated here.
- the projection device of the present invention can realize automatic correction of the projected image of the projection device through the above-mentioned settings, without manually adjusting the position of the projection device, thereby projecting a rectangular projection image on the projection display surface with high correction accuracy , And can be corrected in a short time.
- the present invention also provides a projection image correction method for a projection device.
- the projection device is the projection device in the foregoing embodiment, including:
- Step S501 a distance measuring step, used to measure the distance difference between two different position points on the projection device and the projection display surface, wherein, when the projection device directly faces the projection display surface, The distance between the two different position points and the projection display surface is the same;
- two different location points are location points in the same horizontal direction to correct the left and right trapezoids.
- two different location points are location points located in the same vertical direction to correct the upper and lower trapezoids.
- Step S502 an angle calculation step, configured to receive the distance difference and calculate and obtain tilt angle information of the projection device relative to the projection display surface according to the distance between the two location points and the distance difference ;
- Step S503 a correction step, for receiving the tilt angle information, and correcting the projection image projected on the projection display surface according to the tilt angle information.
- the distance measuring step in step S501 includes the following steps A1 to A3:
- step A1 at least two detection signals having a predetermined transmission speed are emitted toward the projection display surface.
- the transmission directions of the at least two detection signals are parallel to each other.
- the transmission direction of the detection signal is perpendicular to the side opposite to the projection display surface.
- step A2 receive the detection signal reflected back from the projection display surface, and output time information used for transmission to reception;
- step A3 the time information is received, and the distance difference between the two different position points and the projection display surface is calculated according to the difference between the different time information and the predetermined transmission speed.
- the angle information between the projection device and the projection display surface is obtained by calculation using the trigonometric function principle.
- the method of the present invention can realize automatic correction of the projection image of the projection device without manually adjusting the position of the projection device, thereby projecting a rectangular projection image on the projection display surface, with high correction accuracy, and correction can be achieved in a short time.
- the projection device 300 may be a projector, a mobile phone, a computer, a digital broadcasting terminal, a messaging device, a game console, a tablet device, a personal digital assistant, or the like.
- the projection device 300 includes one or more processors 302 and one or more storage devices 304.
- the projection device 300 may further include at least one of an input device 306, an output device 308, a communication interface 310, and an image sensor, these components are interconnected by a bus system 312 and / or other forms of connection mechanisms (not shown) .
- the components and structures of the projection device 300 shown in FIG. 6 are only exemplary and not limiting, and the projection device 300 may also have other components and structures as needed, for example, may also include transceiving for transmitting and receiving signals Device.
- the processor 302 may be a central processing unit (CPU), an image processing unit (GPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other forms having data processing capabilities and / or instruction execution capabilities Processing unit and can control other components in the projection device 300 to perform desired functions.
- the processor can execute the instructions stored in the storage device 304 to execute the projection image correction method of the projection device described herein.
- the processor 302 can include one or more embedded processors, processor cores, microprocessors, logic circuits, hardware finite state machines (FSM), digital signal processors (DSPs), or a combination thereof.
- the storage device 304 is used to store various types of data to support the operation of the projection device.
- one or more computer program products may be included, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory.
- the volatile memory may include, for example, random access memory (RAM) and / or cache memory.
- the non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, and the like.
- One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 302 may execute the program instructions to implement the functions (implemented by the processor) in the embodiments of the present invention described below and / or Or other desired functions.
- Various application programs and various data may also be stored in the computer-readable storage medium, such as various data used and / or generated by the application programs.
- the input device 306 may be a device used by a user to input instructions, and may include one or more of a keyboard, a mouse, a microphone, a touch screen, and the like.
- the output device 308 can output various information (such as images or sounds) to the outside (such as a user), and can include one or more of a display, a speaker, and the like.
- the communication interface 310 is used for communication between the projection apparatus 300 and other devices, including wired or wireless communication.
- the projection device 300 can access a wireless network based on a communication standard, such as WiFi, 2G, 3G, 4G, 5G, or a combination thereof.
- the communication interface 310 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel.
- the communication interface 310 further includes a near field communication (NFC) module to facilitate short-range communication.
- the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
- RFID radio frequency identification
- IrDA infrared data association
- UWB ultra wideband
- Bluetooth Bluetooth
- an embodiment of the present invention also provides a computer storage medium on which a computer program is stored.
- the computer program is executed by the processor, the projection image correction method of the projection device of the foregoing embodiment or each component module in the foregoing projection device may be implemented.
- the computer storage medium may include, for example, a memory card of a smart phone, a storage part of a tablet computer, a hard disk of a personal computer, a read only memory (ROM), an erasable programmable read only memory (EPROM), a portable compact disk Read only memory (CD-ROM), USB memory, or any combination of the above storage media.
- the computer-readable storage medium may be any combination of one or more computer-readable storage media.
- the disclosed device and method may be implemented in other ways.
- the device embodiments described above are only schematic.
- the division of the unit is only a logical function division.
- there may be another division manner for example, multiple units or components may be combined or Can be integrated into another device, or some features can be ignored, or not implemented.
- the various component embodiments of the present invention may be implemented in hardware, or implemented in software modules running on one or more processors, or implemented in a combination thereof.
- a microprocessor or a digital signal processor (DSP) may be used to implement some or all functions of some modules according to embodiments of the present invention.
- DSP digital signal processor
- the present invention can also be implemented as a device program (for example, a computer program and a computer program product) for performing a part or all of the method described herein.
- a program implementing the present invention may be stored on a computer-readable medium, or may have the form of one or more signals.
- Such a signal can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.
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Abstract
本发明提供一种投影装置及其投影图像矫正方法和计算机存储介质，所述投影装置包括：测距模块，用于测量所述投影装置上不同的两个位置点与所述投影显示面之间的距离差值，其中，在所述投影装置正对所述投影显示面时，所述不同的两个位置点与所述投影显示面之间的距离相同；角度运算模块，用于接收所述距离差值，并依据所述两个位置点之间的距离和所述距离差值计算获得所述投影装置相对所述投影显示面的倾斜角度信息；矫正模块，用于接收所述倾斜角度信息，并依据所述倾斜角度信息对投影在所述投影显示面上的投影图像进行矫正。本发明的方法能够对投影图像进行自动矫正。
Description
说明书
本发明涉及投影技术领域，本发明具体而言涉及一种投影装置及其投影图像矫正方法和计算机存储介质。
投影装置的投影图像会根据投影装置相对于投影平面偏转角度的变化而呈现不同程度的变形。当投影装置投影镜头的光轴垂直于投影平面时，投影图像呈标准矩形；然而投影装置经常会遇到不能正面投影的场景，这时需要斜对投影显示面(例如墙面)，此时投影装置投影镜头的光轴不垂直于投影平面时，光轴与投影平面上下方向、或左右方向、或上下左右方向的夹角不是直角，此时，投影图像呈上下梯形、或左右梯形、或不规则的四边形，需要手动调整投影装置的摆放状态，使投影装置投影镜头的光轴尽可能垂直于投影屏幕，才能改善投影图像的变形，得到令人满意的图像。然而，手动调整投影装置摆放状态的方式在某些应用场景下并不便利，且调整费时，而调整效果有时也无法达到最理想的状态。
因此，鉴于上述技术问题的存在，有必要提出一种新的投影装置以及投影装置的投影图像矫正方法。
发明内容
针对现有技术的不足，本发明一方面提供了一种投影装置，包括：
测距模块，用于测量所述投影装置上不同的两个位置点与所述投影显示面之间的距离差值，其中，在所述投影装置正对所述投影显示面时，所述不同的两个位置点与所述投影显示面之间的距离相同；
角度运算模块，用于接收所述距离差值，并依据所述两个位置点之间的距离和所述距离差值计算获得所述投影装置相对所述投影显示面的倾斜角度信息；
矫正模块，用于接收所述倾斜角度信息，并依据所述倾斜角度信息对投影在所述投影显示面上的投影图像进行矫正。
示例性地，所述测距模块包括：
至少两个发射器，分别设置在所述投影装置的不同所述位置点上，用于向所述投影显示面发射具有预定传输速度的至少两个探测信号，其中，在所述投影装置正对所述投影显示面时，所述至少两个发射器与所述投影显示面之间的距离相同；
接收器，与所述发射器成对设置在所述投影装置上，用于接收经所述投影显示面反射回的所述探测信号，并输出发射到接收所用的时间信息；
距离运算模块，用于接收所述时间信息，并依据不同接收器输出的所述时间信息之差和所述预定传输速度计算不同的两个位置点与投影显示面之间的距离差值。
本发明另一方面提供一种投影装置的投影矫正方法，包括：
测距步骤，用于测量所述投影装置上不同的两个位置点与所述投影显示面之间的距离差值，其中，在所述投影装置正对所述投影显示面时，所述不同的两个位置点与所述投影显示面之间的距离相同；
角度运算步骤，用于接收所述距离差值，并依据所述两个位置点之间的距离和所述距离差值计算获得所述投影装置相对所述投影显示面的倾斜角度信息；
矫正步骤，用于接收所述倾斜角度信息，并依据所述倾斜角度信息对投影在所述投影显示面上的投影图像进行矫正。
示例性地，所述测距步骤，包括：
向所述投影显示面发射具有预定传输速度的至少两个探测信号；
接收经所述投影显示面反射回的所述探测信号，并输出发射到接收所用的时间信息；
接收所述时间信息，并依据不同的所述时间信息之差和所述预定传输速度计算不同的两个位置点与投影显示面之间的距离差值。
示例性地，所述至少两个探测信号的传输方向彼此平行。
示例性地，所述探测信号的传输方向垂直于与所述投影显示面相对的侧面。
示例性地，不同的两个位置点为位于同一水平方向上的位置点，以矫正左右梯形；和/或
不同的两个位置点为位于同一竖直方向上的位置点，以矫正上下梯形。
示例性地，利用三角函数原理计算获得所述投影装置与所述投影显示面之间的角度信息。
本发明再一方面提供投影装置，包括：
处理器；
用于存储处理器可执行指令的存储器；
所述处理器用于执行所述存储器中存储的所述指令，使得所述处理器执行前述的投影装置的投影图像矫正方法。
本发明又一方面提供一种计算机存储介质，其上存储有计算机程序，所述程序被处理器执行时实现前述的投影装置的投影图像矫正方法。
本发明的投影装置通过设置测距模块和角度运算模块获得所述投影装置相对所述投影显示面的倾斜角度信息；矫正模块，用于接收所述倾斜角度信息，并依据所述倾斜角度信息对投影在所述投影显示面上的影像进行矫正。本发明的投影装置通过上述设置能够实现对投影装置的投影图像的自动矫正，无需再通过人工调整投影装置的位置，从而在投影显示面上投影矩形的投影图像，矫正精度高，并且短时间就能实现矫正。
本发明的下列附图在此作为本发明的一部分用于理解本发明。附图中示出了本发明的实施例及其描述，用来解释本发明的原理。
附图中：
图1A示出了本发明一个实施方式的投影装置的结构框图；
图1B示出了本发明一个实施方式的投影装置的测距模块的结构框图；
图2示出了本发明一个实施方式的投影装置与投影显示面正对时的示意图；
图3示出了本发明一个实施方式的投影装置相对投影显示面倾斜时的示意图；
图4示出了本发明一个实施方式的投影装置相对投影显示面的倾斜角的示意简图；
图5示出了本发明一个实施方式的投影装置的投影矫正方法的流程图；
图6示出了本发明另一个实施方式的投影装置的框图。
为了使得本发明的目的、技术方案和优点更为明显，下面将参照附图详细描述根据本发明的示例实施例。显然，所描述的实施例仅仅是本发明的一部分实施例，而不是本发明的全部实施例，应理解，本发明不受这里描述的示例实施例的限制。基于本发明中描述的本发明实施例，本领域技术人员在没有付出创造性劳动的情况下所得到的所有其它实施例都应落入本发明的保护范围之内。
在下文的描述中，给出了大量具体的细节以便提供对本发明更为彻底的理解。然而，对于本领域技术人员而言显而易见的是，本发明可以无需一个或多个这些细节而得以实施。在其他的例子中，为了避免与本发明发生混淆，对于本领域公知的一些技术特征未进行描述。
应当理解的是，本发明能够以不同形式实施，而不应当解释为局限于这里提出的实施例。相反地，提供这些实施例将使公开彻底和完全，并且将本发明的范围完全地传递给本领域技术人员。
在此使用的术语的目的仅在于描述具体实施例并且不作为本发明的限制。在此使用时，单数形式的“一”、“一个”和“所述/该”也意图包括复数形式，除非上下文清楚指出另外的方式。还应明白术语“组成”和/或“包括”，当在该说明书中使用时，确定所述特征、整数、步骤、操作、元件和/或部件的存在，但不排除一个或更多其它的特征、整数、步骤、操作、元件、部件和/或组的存在或添加。在此使用时，术语“和/或”包括相关所列项目的任何及所有组合。
为了彻底理解本发明，将在下列的描述中提出详细的结构，以便阐释本发明提出的技术方案。本发明的可选实施例详细描述如下，然 而除了这些详细描述外，本发明还可以具有其他实施方式。
为了解决前述的技术问题，本发明提供一种投影装置，包括：
测距模块，用于测量所述投影装置上不同的两个位置点与所述投影显示面之间的距离差值，其中，在所述投影装置正对所述投影显示面时，所述不同的两个位置点与所述投影显示面之间的距离相同；
角度运算模块，用于接收所述距离差值，并依据所述两个位置点之间的距离和所述距离差值计算获得所述投影装置相对所述投影显示面的倾斜角度信息；
矫正模块，用于接收所述倾斜角度信息，并依据所述倾斜角度信息对投影在所述投影显示面上的投影图像进行矫正。
本发明的投影装置通过设置测距模块和角度运算模块获得所述投影装置相对所述投影显示面的倾斜角度信息；矫正模块，用于接收所述倾斜角度信息，并依据所述倾斜角度信息对投影在所述投影显示面上的影像进行矫正。本发明的投影装置通过上述设置能够实现对投影装置的投影图像的自动矫正，无需再通过人工调整投影装置的位置，从而在投影显示面上投影矩形的投影图像，矫正精度高，并且利短时间就能实现矫正。
下面参考图1A、图1B、图2、图3和图4对本发明的投影装置进行详细解释和说明。在不冲突的前提下，本申请的各个实施例的特征可以相互结合。
如图1A所示，所述投影装置100包括测距模块101，用于测量所述投影装置上不同的两个位置点与所述投影显示面之间的距离差值，其中，在所述投影装置正对所述投影显示面时，所述不同的两个位置点与所述投影显示面之间的距离相同。
在一个示例中，如图2所示，所述测距模块101包括：至少两个发射器1011，分别设置在所述投影装置的不同所述位置点上，用于向所述投影显示面发射具有预定传输速度的至少两个探测信号，其中，在所述投影装置正对所述投影显示面时，所述至少两个发射器与所述投影显示面之间的距离相同。
在一个示例中，所述测距模块接收器1012，与所述发射器1011成对设置在所述投影装置100上，用于接收经所述投影显示面反射回 的所述探测信号，并输出发射到接收所用的时间信息。其中，在所述接收器和发射器与所述投影显示面的距离不同时，接收器发射的时间信息也不同，例如如图2所示，在所述投影装置100正对所述投影显示面202时，所述至少两个发射器1011与所述投影显示面202之间的距离相同，也即三个接收器接收到的探测信号的时间相同，其输出的时间信息则相同，而如图3所示，投影装置100相对投影显示面202倾斜设置，使得原本与投影显示面202距离相同的3个发射器1011与投影显示面202之间的距离变的不同，自左向右距离依次变大，那么接收器在接收到探测信号时的时间也就不同，不同的接收器也就反馈不同的时间信息。
不同的两个位置点为位于同一水平方向上的位置点，以矫正左右梯形，获得标准的投影图像，也即该些位置点的连线的延长线沿水平方向延伸，并且与所述投影装置和所述投影显示面相对的侧面平行，例如所述位置点为投影装置的顶面上的位置点，该些位置点连线的延长线与所述投影装置和所述投影显示面相对的侧面平行，或者该些位置点连线的延长线位于与所述投影装置与所述投影显示面相对的侧面上。上述设置的目的是用于矫正左右梯形，上述位置点之间的距离均是固定的。
不同的两个位置点为位于同一竖直方向上的位置点，以矫正上下梯形，获得标准的投影图像，也即获得基本上为矩形的投影图像，避免投影图像发生拉伸而导致的变形失真。也即该些位置点的连线的延长线沿竖直方向延伸，并且与所述投影装置和所述投影显示面相对的侧面平行，例如所述位置点为投影装置的侧面上的位置点，该些位置点连线的延长线与所述投影装置和所述投影显示面相对的侧面平行，或者该些位置点连线的延长线位于与所述投影装置与所述投影显示面相对的侧面内。
具体地，在每个所述位置点设置发射器和接收器，以对不同的两个位置点到投影显示面的距离差值进行测量。
其中，所述发射器和接收器可以是任意适合类型的发射器和接收器，例如，所述发射器包括红外发射器，所述接收器包括红外接收器；或者，所述发射器包括声波发射器，所述接收器包括声波接收器；或 者，所述发射器包括激光发射器，所述接收器包括激光接收器。
上述发射器和接收器成对设置，对于发射器和接收器的数目可以根据实际的测量需求进行合理选择，例如，3个发射器和3个接收器、4个发射器和4个接收器等。可以在所述投影装置的顶面上邻近所述投影显示面的位置设置3个发射器和3个接收器，所述3个发射器沿水平方向等间隔设置，如图2和图3所示。
在一个示例中，如图2和图3所示，所述测距模块包括至少两个发射器1011，分别设置在所述投影装置的不同所述位置点上，例如，可以在所述投影装置的顶面上邻近所述投影显示面的位置设置3个发射器1011和3个接收器(未示出)，发射器1011用于向所述投影显示面发射具有预定传输速度的探测信号，其中，如图2所示，在所述投影装置100正对所述投影显示面202时，所述至少两个发射器1011与所述投影显示面202之间的距离相同，也即三个接收器接收到的探测信号的时间相同。
在一个示例中，如图2和图3所示，所述至少两个发射器用于发射传输方向彼此平行的探测信号，其中较佳地，所述探测信号的传输方向与所述投影显示面相对的侧面之间的夹角小于或等于90°，特别是，所述探测信号的传输方向垂直于与所述投影显示面相对的侧面，以便于计算投影装置100相对投影显示面202的倾角。
图3所示的结构中投影装置100相对投影显示面202倾斜设置，如果不进行任何矫正处理，那么投影到投影显示面上的投影图像会发生左右梯形变形，而导致图像发生拉伸变形，所以需要对其进行矫正以使得投影图像矫正为矩形。
在一个示例中，如图1B所示，所述测距模块101包括距离运算模块1013，用于接收所述时间信息，并依据不同接收器输出的所述时间信息之差和所述预定传输速度计算不同的两个位置点与投影显示面之间的距离差值。例如，如图3所示，假设最左侧的接收器接收的时间是0.01s，中间的接收器接收的时间是0.02s，则接收器将其时间信息输出至距离运算模块1013，由距离运算模块1013计算两者的时间差，例如两者的时间差是0.01s，用该时间差乘以探测信号的传输速度(例如红外速度)再除以2即可获得两个发射器与投影显示面 之间的距离差，例如得出距离差5厘米。
在一个示例中，如图1A所示，所述投影装置还包括角度运算模块102，用于接收所述距离差值，并依据所述两个位置点之间的距离和所述距离差值计算获得所述投影装置相对所述投影显示面的倾斜角度信息。例如如图4所示，两个位置点之间的距离也即两个接收器或两个发射器之间的距离D1，该距离D1是固定的，例如为5厘米，具体的该距离根据实际测量的需要进行合理设定，上述数值仅作为示例并不构成限制。因为两个红外接收器之间的距离是固定的，探测信号和投影装置的侧面之间夹角也可以是固定的，根据接收到的测距模块输出的距离差值D2，利用三角函数原理，得出投影仪相对投影显示面的倾斜角度，例如45度。
前述的投影显示面可以是任意适合的表面，例如墙面，投影幕布等。
在一个示例中，如图1A所示，所述投影装置还包括矫正模块103，用于接收所述倾斜角度信息，并依据所述倾斜角度信息对投影在所述投影显示面202上的投影图像进行矫正，以获得矫正后的基本上为矩形的投影图像。
所述矫正模块103可以是本领域技术人员熟知的能够对投影图像进行矫正的部件，在此不做具体限定。
前述各个模块和器件之间可以通过任意适合的方式进行数据通信传输，例如通过各种适合的有线连接方式或者无线连接方式等。
至此完成了对本发明的投影装置的主要结构的介绍，对于完整的投影装置结构还可能包括其他部件，例如用于投影的各种光学系统等等，在此不做一一赘述。
综上所述，本发明的投影装置通过上述设置能够实现对投影装置的投影图像的自动矫正，无需再通过人工调整投影装置的位置，从而在投影显示面上投影矩形的投影图像，矫正精度高，并且短时间就能实现矫正。
在另一个实施例中，如图5所示，本发明还提供一种投影装置的投影图像矫正方法，该投影装置为前述实施例中的投影装置，包括：
步骤S501，测距步骤，用于测量所述投影装置上不同的两个位 置点与所述投影显示面之间的距离差值，其中，在所述投影装置正对所述投影显示面时，所述不同的两个位置点与所述投影显示面之间的距离相同；
示例性地，不同的两个位置点为位于同一水平方向上的位置点，以矫正左右梯形。
示例性地，不同的两个位置点为位于同一竖直方向上的位置点，以矫正上下梯形。
步骤S502，角度运算步骤，用于接收所述距离差值，并依据所述两个位置点之间的距离和所述距离差值计算获得所述投影装置相对所述投影显示面的倾斜角度信息；
步骤S503，矫正步骤，用于接收所述倾斜角度信息，并依据所述倾斜角度信息对投影在所述投影显示面上的投影图像进行矫正。
在一个示例中，步骤S501中的所述测距步骤，包括一下步骤A1至步骤A3：
在步骤A1中，在向所述投影显示面发射具有预定传输速度的至少两个探测信号。可选地，所述至少两个探测信号的传输方向彼此平行。可选地，所述探测信号的传输方向垂直于与所述投影显示面相对的侧面。
在步骤A2中，接收经所述投影显示面反射回的所述探测信号，并输出发射到接收所用的时间信息；
在步骤A3中，接收所述时间信息，并依据不同的所述时间信息之差和所述预定传输速度计算不同的两个位置点与投影显示面之间的距离差值。
示例性地，利用三角函数原理计算获得所述投影装置与所述投影显示面之间的角度信息。
具体地，上述方法的具体实施参考前述投影装置的描述，在本实施例中不做赘述。
本发明的方法能够实现对投影装置的投影图像的自动矫正，无需再通过人工调整投影装置的位置，从而在投影显示面上投影矩形的投影图像，矫正精度高，并且短时间就能实现矫正。
图6示出了本发明另一个实施方式的投影装置的框图。例如，投 影装置300可以是投影仪，移动电话，计算机，数字广播终端，消息收发设备，游戏控制台，平板设备，个人数字助理等。
如图6所示，投影装置300包括一个或多个处理器302、一个或多个存储装置304。可选地，投影装置300还可以包括输入装置306、输出装置308、通信接口310以及图像传感器中的至少一个，这些组件通过总线系统312和/或其它形式的连接机构(未示出)互连。应当注意，图6所示的投影装置300的组件和结构只是示例性的，而非限制性的，根据需要，投影装置300也可以具有其他组件和结构，例如还可以包括用于收发信号的收发器。
所述处理器302可以是中央处理单元(CPU)、图像处理单元(GPU)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者具有数据处理能力和/或指令执行能力的其它形式的处理单元，并且可以控制所述投影装置300中的其它组件以执行期望的功能。所述处理器能够执行所述存储装置304中存储的所述指令，以执行本文描述的投影装置的投影图像矫正方法。例如，处理器302能够包括一个或多个嵌入式处理器、处理器核心、微型处理器、逻辑电路、硬件有限状态机(FSM)、数字信号处理器(DSP)或它们的组合。
所述存储装置304用于存储各种类型的数据以支持投影装置的操作。例如可以包括一个或多个计算机程序产品，所述计算机程序产品可以包括各种形式的计算机可读存储介质，例如易失性存储器和/或非易失性存储器。所述易失性存储器例如可以包括随机存取存储器(RAM)和/或高速缓冲存储器(cache)等。所述非易失性存储器例如可以包括只读存储器(ROM)、硬盘、闪存等。在所述计算机可读存储介质上可以存储一个或多个计算机程序指令，处理器302可以运行所述程序指令，以实现下文所述的本发明实施例中(由处理器实现)的功能以及/或者其它期望的功能。在所述计算机可读存储介质中还可以存储各种应用程序和各种数据，例如所述应用程序使用和/或产生的各种数据等。
所述输入装置306可以是用户用来输入指令的装置，并且可以包括键盘、鼠标、麦克风和触摸屏等中的一个或多个。
所述输出装置308可以向外部(例如用户)输出各种信息(例如图像或声音)，并且可以包括显示器、扬声器等中的一个或多个。
通信接口310用于投影装置300和其他设备之间进行通信，包括有线或者无线方式的通信。投影装置300可以接入基于通信标准的无线网络，如WiFi、2G、3G、4G、5G或它们的组合。在一个示例性实施例中，通信接口310经由广播信道接收来自外部广播管理系统的广播信号或广播相关信息。在一个示例性实施例中，所述通信接口310还包括近场通信(NFC)模块，以促进短程通信。例如，在NFC模块可基于射频识别(RFID)技术，红外数据协会(IrDA)技术，超宽带(UWB)技术，蓝牙(BT)技术和其他技术来实现。
另外，本发明实施例还提供了一种计算机存储介质，其上存储有计算机程序。当所述计算机程序由处理器执行时，可以实现前述实施例的投影装置的投影图像矫正方法或前述投影装置中的各组成模块。例如，所述计算机存储介质例如可以包括智能电话的存储卡、平板电脑的存储部件、个人计算机的硬盘、只读存储器(ROM)、可擦除可编程只读存储器(EPROM)、便携式紧致盘只读存储器(CD-ROM)、USB存储器、或者上述存储介质的任意组合。所述计算机可读存储介质可以是一个或多个计算机可读存储介质的任意组合。
尽管这里已经参考附图描述了示例实施例，应理解上述示例实施例仅仅是示例性的，并且不意图将本发明的范围限制于此。本领域普通技术人员可以在其中进行各种改变和修改，而不偏离本发明的范围和精神。所有这些改变和修改意在被包括在所附权利要求所要求的本发明的范围之内。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
在本申请所提供的几个实施例中，应该理解到，所揭露的设备和 方法，可以通过其它的方式实现。例如，以上所描述的设备实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个设备，或一些特征可以忽略，或不执行。
在此处所提供的说明书中，说明了大量具体细节。然而，能够理解，本发明的实施例可以在没有这些具体细节的情况下实践。在一些实例中，并未详细示出公知的方法、结构和技术，以便不模糊对本说明书的理解。
类似地，应当理解，为了精简本发明并帮助理解各个发明方面中的一个或多个，在对本发明的示例性实施例的描述中，本发明的各个特征有时被一起分组到单个实施例、图、或者对其的描述中。然而，并不应将该本发明的方法解释成反映如下意图：即所要求保护的本发明要求比在每个权利要求中所明确记载的特征更多的特征。更确切地说，如相应的权利要求书所反映的那样，其发明点在于可以用少于某个公开的单个实施例的所有特征的特征来解决相应的技术问题。因此，遵循具体实施方式的权利要求书由此明确地并入该具体实施方式，其中每个权利要求本身都作为本发明的单独实施例。
本领域的技术人员可以理解，除了特征之间相互排斥之外，可以采用任何组合对本说明书(包括伴随的权利要求、摘要和附图)中公开的所有特征以及如此公开的任何方法或者设备的所有过程或单元进行组合。除非另外明确陈述，本说明书(包括伴随的权利要求、摘要和附图)中公开的每个特征可以由提供相同、等同或相似目的替代特征来代替。
此外，本领域的技术人员能够理解，尽管在此所述的一些实施例包括其它实施例中所包括的某些特征而不是其它特征，但是不同实施例的特征的组合意味着处于本发明的范围之内并且形成不同的实施例。例如，在权利要求书中，所要求保护的实施例的任意之一都可以以任意的组合方式来使用。
本发明的各个部件实施例可以以硬件实现，或者以在一个或者多个处理器上运行的软件模块实现，或者以它们的组合实现。本领域的技术人员应当理解，可以在实践中使用微处理器或者数字信号处理器 (DSP)来实现根据本发明实施例的一些模块的一些或者全部功能。本发明还可以实现为用于执行这里所描述的方法的一部分或者全部的装置程序(例如，计算机程序和计算机程序产品)。这样的实现本发明的程序可以存储在计算机可读介质上，或者可以具有一个或者多个信号的形式。这样的信号可以从因特网网站上下载得到，或者在载体信号上提供，或者以任何其他形式提供。
应该注意的是上述实施例对本发明进行说明而不是对本发明进行限制，并且本领域技术人员在不脱离所附权利要求的范围的情况下可设计出替换实施例。在权利要求中，不应将位于括号之间的任何参考符号构造成对权利要求的限制。本发明可以借助于包括有若干不同元件的硬件以及借助于适当编程的计算机来实现。在列举了若干装置的单元权利要求中，这些装置中的若干个可以是通过同一个硬件项来具体体现。单词第一、第二、以及第三等的使用不表示任何顺序。可将这些单词解释为名称。
Claims (10)
- 一种投影装置，其特征在于，包括：测距模块，用于测量所述投影装置上不同的两个位置点与所述投影显示面之间的距离差值，其中，在所述投影装置正对所述投影显示面时，所述不同的两个位置点与所述投影显示面之间的距离相同；角度运算模块，用于接收所述距离差值，并依据所述两个位置点之间的距离和所述距离差值计算获得所述投影装置相对所述投影显示面的倾斜角度信息；矫正模块，用于接收所述倾斜角度信息，并依据所述倾斜角度信息对投影在所述投影显示面上的投影图像进行矫正。
- 如权利要求1所述的投影装置，其特征在于，所述测距模块包括：至少两个发射器，分别设置在所述投影装置的不同所述位置点上，用于向所述投影显示面发射具有预定传输速度的至少两个探测信号，其中，在所述投影装置正对所述投影显示面时，所述至少两个发射器与所述投影显示面之间的距离相同；接收器，与所述发射器成对设置在所述投影装置上，用于接收经所述投影显示面反射回的所述探测信号，并输出发射到接收所用的时间信息；距离运算模块，用于接收所述时间信息，并依据不同接收器输出的所述时间信息之差和所述预定传输速度计算不同的两个位置点与投影显示面之间的距离差值。
- 一种投影装置的投影图像矫正方法，其特征在于，包括：测距步骤，用于测量所述投影装置上不同的两个位置点与所述投影显示面之间的距离差值，其中，在所述投影装置正对所述投影显示面时，所述不同的两个位置点与所述投影显示面之间的距离相同；角度运算步骤，用于接收所述距离差值，并依据所述两个位置点之间的距离和所述距离差值计算获得所述投影装置相对所述投影显示面的倾斜角度信息；矫正步骤，用于接收所述倾斜角度信息，并依据所述倾斜角度信息对投影在所述投影显示面上的投影图像进行矫正。
- 如权利要求3所述的投影图像矫正方法，其特征在于，所述测距步骤，包括：向所述投影显示面发射具有预定传输速度的至少两个探测信号；接收经所述投影显示面反射回的所述探测信号，并输出发射到接收所用的时间信息；接收所述时间信息，并依据不同的所述时间信息之差和所述预定传输速度计算不同的两个位置点与投影显示面之间的距离差值。
- 如权利要求4所述的投影图像矫正方法，其特征在于，所述至少两个探测信号的传输方向彼此平行。
- 如权利要求4所述的投影图像矫正方法，其特征在于，所述探测信号的传输方向垂直于与所述投影显示面相对的侧面。
- 如权利要求3所述的投影图像矫正方法，其特征在于，不同的两个位置点为位于同一水平方向上的位置点，以矫正左右梯形；和/或不同的两个位置点为位于同一竖直方向上的位置点，以矫正上下梯形。
- 如权利要求3所述的投影图像矫正方法，其特征在于，利用三角函数原理计算获得所述投影装置与所述投影显示面之间的角度信息。
- 一种投影装置，其特征在于，包括：处理器；用于存储处理器可执行指令的存储器；所述处理器用于执行所述存储器中存储的所述指令，使得所述处理器执行权利要求3至8中任一项所述的投影装置的投影图像矫正方法。
- 一种计算机存储介质，其上存储有计算机程序，其特征在于，所述程序被处理器执行时实现权利要求3至8中任一项所述的投影装置的投影图像矫正方法。
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| US20040125364A1 (en) * | 2002-08-30 | 2004-07-01 | Shiroshi Kanemitsu | Angle detecting apparatus and projector having the same |
| JP2004282129A (ja) * | 2003-03-12 | 2004-10-07 | Sharp Corp | 投映型表示装置 |
| CN102300070A (zh) * | 2010-06-23 | 2011-12-28 | 鸿富锦精密工业（深圳）有限公司 | 投影仪及其校正装置 |
| CN106200225A (zh) * | 2016-09-21 | 2016-12-07 | 北京小米移动软件有限公司 | 投影仪的梯形校正方法及装置 |
| CN106612422A (zh) * | 2015-12-31 | 2017-05-03 | 北京数科技有限公司 | 一种投影校正方法及装置 |
| CN107343186A (zh) * | 2017-06-13 | 2017-11-10 | 北京小米移动软件有限公司 | 投影设备控制方法及装置 |
| CN109274947A (zh) * | 2018-10-18 | 2019-01-25 | 安克创新科技股份有限公司 | 一种投影装置及其投影图像矫正方法和计算机存储介质 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040125364A1 (en) * | 2002-08-30 | 2004-07-01 | Shiroshi Kanemitsu | Angle detecting apparatus and projector having the same |
| JP2004282129A (ja) * | 2003-03-12 | 2004-10-07 | Sharp Corp | 投映型表示装置 |
| CN102300070A (zh) * | 2010-06-23 | 2011-12-28 | 鸿富锦精密工业（深圳）有限公司 | 投影仪及其校正装置 |
| CN106612422A (zh) * | 2015-12-31 | 2017-05-03 | 北京数科技有限公司 | 一种投影校正方法及装置 |
| CN106200225A (zh) * | 2016-09-21 | 2016-12-07 | 北京小米移动软件有限公司 | 投影仪的梯形校正方法及装置 |
| CN107343186A (zh) * | 2017-06-13 | 2017-11-10 | 北京小米移动软件有限公司 | 投影设备控制方法及装置 |
| CN109274947A (zh) * | 2018-10-18 | 2019-01-25 | 安克创新科技股份有限公司 | 一种投影装置及其投影图像矫正方法和计算机存储介质 |
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