WO2020042568A1 - 投影方法、投影设备及计算机可读存储介质 - Google Patents

投影方法、投影设备及计算机可读存储介质 Download PDF

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Publication number
WO2020042568A1
WO2020042568A1 PCT/CN2019/076639 CN2019076639W WO2020042568A1 WO 2020042568 A1 WO2020042568 A1 WO 2020042568A1 CN 2019076639 W CN2019076639 W CN 2019076639W WO 2020042568 A1 WO2020042568 A1 WO 2020042568A1
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Prior art keywords
projection
screen
image
offset
amount
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PCT/CN2019/076639
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English (en)
French (fr)
Inventor
谢颂婷
亓森林
杨佳翼
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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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]
    • H04N9/3141—Constructional details thereof
    • 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]
    • 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

Definitions

  • the present invention relates to the field of projection technology, and in particular, to a projection method, a projection device, and a computer-readable storage medium.
  • Projectors are used in conferences and teaching in daily life. Projectors play a pivotal role in our lives.
  • the lens of the projector is heated during the work process, which causes a certain degree of shift in the picture emitted by the lens to the screen.
  • a large shift will affect the customer's viewing Feel.
  • the projection image of the projector will also change due to the passage of time, which will affect the projection effect.
  • a projector requires a user to manually or gradually adjust the projection direction and angle of the projector through a remote control.
  • the lack of a solution for quickly and effectively correcting the position of the screen projected by the projector is not conducive to improving the user experience.
  • the present invention provides a projection method that can automatically adjust the position of the projected image.
  • the present invention also provides a projection device and a computer-readable storage medium.
  • a projection method includes the following steps:
  • an offset direction and an offset amount of the projection image frame on the projection screen are calculated, and according to the offset direction and the offset amount, the offset The projection position of the projected image screen is corrected.
  • a projection device includes a housing, a lens device provided on a surface of the housing, an image acquisition device, a distance sensor, and a control device and a light modulation device provided inside the housing;
  • the control device is configured to control the distance sensor to measure a projection distance
  • the control device is further configured to control the light modulation device to modulate light and emit image light, and the image light passes through the lens device and is irradiated to a projection screen to form a projection image screen;
  • the control device and the control device are used to control the image acquisition device to collect a projection image frame, and calculate an offset direction and an offset of the projection image frame on the projection screen according to the acquired projection image frame and the measured projection distance. To correct the projection position of the projected image frame.
  • a computer-readable storage medium stores therein a computer program that, when executed, implements a projection method as described above.
  • the projection device provided by the present invention adopts the projection method, and calculates an offset direction and an offset amount of the projection image screen in the image coordinate system according to the acquired projection image screen and the measured projection distance, and according to the offset, The direction and the offset amount, to realize the correction of the projected image screen.
  • the projection device in the present invention adopts the projection method, which does not require manual adjustment and does not need to undergo multiple contrast adjustments, is convenient to use, and is beneficial to improving user experience.
  • FIG. 1 is a schematic structural diagram of a projection device according to a first embodiment of the present invention.
  • FIG. 2 is a flowchart of a projection method adopted by the projection device shown in FIG. 1.
  • FIG. 3 is a schematic structural diagram of a projection device according to a second embodiment of the present invention.
  • FIG. 4 is a flowchart of a projection method adopted by the projection device shown in FIG. 3.
  • the invention provides a projection method and a projection device.
  • the projection device applies the projection method, which does not need manual adjustment and does not need to undergo multiple contrast adjustments, and can conveniently use a projector to realize automatic projection image screen correction.
  • FIG. 1 is a schematic structural diagram of a projection device 100 according to a first embodiment of the present invention.
  • the projection device 100 includes a housing 110, a lens device 120 provided on the surface of the housing, an image acquisition device 130, a distance sensor 140, and a control device (not shown) and a light modulation device (not shown) provided inside the housing 110. ⁇ ).
  • the control device is configured to control the light modulation device to modulate light and emit image light, and the image light is irradiated to the screen through the lens device 120 to form a projected image screen; the control device is further configured to control the image acquisition device 130 Collect a projection image screen, control the distance sensor 140 to measure the projection distance, and use the projection method provided by the present invention to perform image correction.
  • the light modulation device is an LCD (Liquid Crystal Display), an LCOS (Liquid Crystal), a liquid crystal with silicon (also called silicon-based liquid crystal), or a DMD (Digital Mirror Device, Digital Micromirror Device). Mirror element).
  • the projection apparatus 100 further includes a light source device (not shown) for emitting light to the light modulation device, and the light modulation device includes a modulation area for performing light modulation, and the modulation area A plurality of pixels for modulating light are arranged in an array, and the modulation area is used to modulate incident light and emit the image light. The light emitted from the modulation area passes through the lens device 120 to form a projection image frame on the projection screen.
  • the structure of the lens device 120 is not limited.
  • the lens device 120 includes a plurality of lenses.
  • the lens device 120 includes a mirror group, a first lens group having a positive refractive power, and a second lens group.
  • the second lens group has a positive refractive power and is disposed on a side of the first lens group remote from the light modulation device, and the second lens group includes a plurality of lenses.
  • the mirror group has a negative reflection power and is located on a side of the second lens group far from the first lens group.
  • the mirror has a reflective curved surface for reflecting after passing through the second lens group. Image light. Due to the configuration of the first lens group, the second lens group, and the mirror group, the lens device 120 provides the function of a wide-angle lens group through the mirror group, so that the lens device 120 can maintain good imaging quality, The overall volume is reduced, and production costs are reduced.
  • the image acquisition device 130 includes a circuit board, an image sensor, a filter, and a lens assembly.
  • the image sensor is mounted on the middle of the circuit board.
  • the circuit board surrounding the image sensor has a passive component and connects the image sensor and the passive component.
  • a gold wire is formed on the non-photosensitive area of the image sensor with a ring-shaped flange surrounding the photosensitive area of the image sensor.
  • the image sensor and the circuit board outside the ring-shaped flange are formed by plastic sealing material.
  • a plastic package covered with passive components and gold wires, a sinking groove is formed in the middle of the upper side of the plastic package, and the periphery of the filter is attached to the sinking groove; the lens assembly is mounted on The upper side of the plastic package.
  • the image acquisition device 130 is a compact and direct-fitting type image acquisition device with a filter. It is used to dispense and dry the adhesive around the non-photosensitive area around the image sensor for a week to form a ring-shaped edge, which can prevent the plastic sealing material from entering the image during molding.
  • the photosensitive area of the sensor can prevent the mold from crushing the photosensitive area of the image sensor during molding; the non-photosensitive area of the image sensor and the surrounding passive components and gold wires are all cast together by a plastic package formed by a molding material to form a
  • the overall structure reduces the space occupied by the bracket, thereby achieving the purpose of reducing the size of the camera module and enhancing the reliability of the product.
  • the distance sensor 140 includes one of an infrared ranging device or a laser ranging device.
  • the distance sensor 140 uses a phase method to measure the projection distance, that is, the distance sensor 140 amplitude-modulates the emitted light and measures the phase delay caused by the outgoing light returning once, and then converts the wavelength according to the wavelength of the outgoing light The distance represented by the phase delay.
  • the distance sensor 140 uses the pulse method to measure the first distance, that is, the light emitted by the distance sensor 140 is reflected by the projection screen and then received by the distance sensor 140. The distance sensor 140 records the light traveling back and forth. time. The distance measurement result corresponding to the projection distance is converted according to the wavelength of the emitted light.
  • the distance sensor 140 may include a distance measurement sensor and a processor, and the processor processes an output signal of the distance measurement sensor to obtain the projection distance.
  • the distance sensor 140 includes a distance measurement sensor, and the control device in the projection device 100 processes the output signal of the distance measurement sensor to obtain the projection distance.
  • control device in the projection device 100 may be a single-chip microcomputer, a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), and application-specific integrated circuits (Applications).
  • CPU central processing unit
  • DSP digital signal processor
  • Applications Application-specific integrated circuits
  • ASIC Specific Integrated Circuit
  • FPGA field-Programmable Gate Array
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • FIG. 2 is a flowchart of a projection method adopted by the projection device 100 shown in FIG. 1.
  • the projection method in the present invention calculates an offset direction and an offset amount of the projection image screen on the projection screen according to the acquired projection image screen and the measured projection distance, and according to the offset direction and The offset amount is used to correct a projection position of the projection image screen. Further, the shift amount of the projection image picture on the projection screen is converted into an offset pixel amount of the modulation image in the light modulation device, or converted into an optical axis of the lens device 120 to shift the projection image.
  • the projection position of the projection image screen is performed Correction.
  • the control device is configured to convert an offset amount of the projection image picture on the projection screen into an offset pixel amount of the modulated image in the light modulation device, or convert it into an optical axis of the lens device 120 Offset the central axis axis of the projected image screen from the offset amount of the modulated image or the optical axis from the central axis axis of the projected image screen to the projection The projection position of the image frame is corrected.
  • implementing the above projection method by using the control device includes the following steps:
  • S101 Calculate the offset direction and amount of the projection image screen on the projection screen according to the acquired projection image screen and the measured projection distance.
  • a projection image screen projected onto the projection screen may also be collected by the image acquisition device 130, and it may be determined whether the projection image screen is shifted based on a position of a frame of the projection screen. If there is an offset, step S101 is performed, and if there is no offset, it is determined whether there is an offset in the next captured frame of the projected image picture according to the instruction.
  • the image capture device 130 is configured to capture the projected image frame
  • the distance sensor 140 is configured to measure the projected distance
  • the control device is configured to collect the projected image frame and the measured projected distance based on the acquired projected image frame. , Calculating a shift direction and a shift amount of the projection image picture on the projection screen.
  • the image acquisition device 130 is disposed on the top of the lens device 120, and the distance sensor 140 is disposed on the bottom of the lens device 120. It can be understood that the image acquisition device 130 and the distance sensor 140 can also be disposed adjacent to each other. Alternatively, it may be disposed at another position of the lens device 120.
  • the projection screen includes a frame, and the size of the area within the frame is X * Y.
  • the size of the projection image screen in the projection screen is X * Y
  • the unit is length, such as mm or cm. It can be understood that, in other embodiments, the size of the area within the frame may be larger than X * Y, and a gap is also provided between the projected image screen and the frame.
  • the image acquisition device 130 includes a plurality of photosensitive units arranged in an array, and each photosensitive unit is configured to convert an incident optical signal into a corresponding electric signal.
  • the distance between adjacent photosensitive units is ⁇ p
  • the offset pixel amount of the projection image detected by the image acquisition device 130 is ⁇ P * ⁇ Q, which has a pixel unit.
  • ⁇ P and ⁇ Q refer to the distance between the detected projection image screen and the frame of the projection screen among the projection image screens collected by the control device,
  • the projection distance is the measured distance L between the image acquisition device 130 and the projection screen
  • the focal length of the image acquisition device 130 is f, where the optical length of the lens assembly is d, the front focal length is f1, and the rear focal length. Is f2, and the above parameters are all known quantities, the image magnification ⁇ of the image acquisition device 130 can be calculated:
  • A L-d-f1-f2.
  • the distance ⁇ p the magnification ⁇
  • the detected projection image of the adjacent photosensitive unit of the image acquisition device 130 in the projection device 100 The distances ⁇ P and ⁇ Q between the frame and the frame of the projection screen are calculated to obtain the offsets ⁇ x and ⁇ y of the projection image frame on the projection screen.
  • the offset pixel amounts ⁇ S, ⁇ T of the modulated image are calculated according to the dimensions X, Y and the offset amounts ⁇ x, ⁇ y of the projected image screen, and the number of pixels M * N in the modulation area, As shown in the following formula:
  • the image light emitted from the moved modulation area passes through the lens device 120 to be imaged on the projection screen, and the projection image frame completely falls into the area surrounded by the frame of the projection screen.
  • the projection device 100 provided in the embodiment of the present invention adopts the projection method, and calculates an offset direction and an offset amount of the projection image screen on the projection screen according to the acquired projection image screen and the measured projection distance, and According to the offset direction and the offset amount, an offset pixel amount of a modulation image in a corresponding light modulation device is calculated, thereby realizing correction of a projection position of the projection image screen.
  • the projection device 100 adopts the projection method, which does not require manual adjustment and does not require multiple contrast adjustments. It is convenient to use and is beneficial to improving the user experience.
  • FIG. 3 is a schematic structural diagram of a projection device 200 according to a second embodiment of the present invention.
  • the projection device 200 further includes a driving device 250 connected between the lens device 220 and the control device.
  • the control device sends a control signal according to the offset of the optical axis of the lens device 200 from the central axis of the projection image screen, and the driving device 250 drives the optical axis of the lens device 220 to exceed the projection image screen according to the control signal. Move in the direction of the central axis.
  • the specific solutions applicable to the first embodiment can also be correspondingly applied to the second embodiment. To save space and avoid repetition, here Will not repeat them.
  • the same as the first embodiment is that the projection position of the projection image screen is projected according to the offset direction and amount of the projection image screen on the projection screen. Make corrections.
  • FIG. 4 is a flowchart of a projection method adopted by the projection device 200 shown in FIG. 3.
  • the projection method in the present invention includes converting an offset amount of the projection image frame on the projection screen into an offset pixel amount of the modulated image in the light modulation device, or converting the optical axis offset of the lens device 220 Shifting the shift amount of the central axis of the projection image screen, and shifting the projection image based on the offset pixel amount of the modulation image or the shift amount of the optical axis from the central axis of the projection image screen The projection position of the screen is corrected.
  • control device is configured to convert an offset amount of the projection image picture on the projection screen into an offset pixel amount of the modulated image in the light modulation device, or convert it into an optical axis of the lens device 220 Offset the central axis axis of the projected image screen from the offset amount of the modulated image or the optical axis from the central axis axis of the projected image screen to the projection
  • the projection position of the image frame is corrected.
  • the projection method includes:
  • Step S201 Calculate an offset direction and an offset ⁇ x, ⁇ y of the projection image screen on the projection screen according to the acquired projection image screen and the measured projection distance.
  • Step S201 is the same as step S101, and details are not described herein.
  • control device After the control device calculates an offset of the optical axis from the central axis of the projection image screen, it outputs an offset from the central axis of the central axis of the projection image screen from the optical axis. Pulse signal corresponding to the offset.
  • the driving device 250 includes a driving chip and a stepping motor.
  • the driving chip outputs a corresponding driving signal according to the pulse signal.
  • the stepping motor receives the driving signal to drive the lens device 220 to move.
  • the moved lens device 220 is imaged on a projection screen, and the projected image frame completely falls into an area surrounded by a frame of the projection screen.
  • the projection device 200 adopts the above-mentioned projection method, and calculates the offset direction and amount of the projection image screen on the projection screen based on the acquired projection image screen and the measured projection distance, and according to An offset of the projection image screen on the projection screen, and an offset of an optical axis of the lens device 220 from an axis of the central axis of the projection image screen is calculated, so as to implement a projection position of the projection image screen Correction.
  • the projection device 200 adopts the projection method, which does not require manual adjustment and does not require multiple contrast adjustments, is convenient to use, and is beneficial to improving user experience.
  • the present invention also provides a computer-readable storage medium in which a computer program is stored, and when the computer program is executed, the projection method as described above is implemented.

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  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Projection Apparatus (AREA)

Abstract

本发明提供一种投影方法、投影设备及计算机可读存储介质，所述投影方法包括以下步骤：根据采集到的投影图像画面及测得的投影距离，计算所述投影图像画面在投影屏幕上的偏移方向及偏移量，并根据所述偏移方向及所述偏移量，对所述投影图像画面的投影位置进行校正。所述投影设备采用所述投影方法不需要人工手动调节且无需经过多次对比调节，使用方便，有利于提高用户体验。

Description

投影方法、投影设备及计算机可读存储介质 技术领域
本发明涉及投影技术领域，尤其涉及一种投影方法、投影设备及计算机可读存储介质。
背景技术
本部分旨在为权利要求书中陈述的本发明的具体实施方式提供背景或上下文。此处的描述不因为包括在本部分中就承认是现有技术。
在日常生活中各种会议以及教学中都会用到投影仪，投影仪在我们的生活中起到了举足轻重的作用。在日常家庭应用场景中，投影机的镜头在工作过程中受热，导致镜头出射到屏幕的画面产生一定程度的偏移，在使用特定尺寸的银幕时，较大的偏移量会影响客户的观看感受。而且在使用过程中也会因为时间的推移投影仪的投影图像画面也会发生改变，从而影响投影效果。
现有技术中，投影仪需要用户人工手动或者通过遥控器逐步地调整投影仪的投影方向以及角度，缺乏快速有效地对投影仪投射出画面的位置进行校正的方案，不利于提高用户体验。
发明内容
为解决现有技术中投影仪不能自动校正投影图像画面的技术问题，本发明提供一种可以自动调整投影画面位置的投影方法，本发明还提供一种投影设备及计算机可读存储介质。
一种投影方法，包括以下步骤：
根据采集到的投影图像画面及测得的投影距离，计算所述投影图像画面在投影屏幕上的偏移方向及偏移量，并根据所述偏移方向及所述偏移量，对所述投影图像画面的投影位置进行校正。
一种投影设备，包括壳体、设置于所述壳体表面的镜头装置、图像采集装置、距离传感器、及设置于所述壳体内部的控制装置及光调制装置；
其中，所述控制装置用于控制所述距离传感器测量投影距离；
所述控制装置还用于控制所述光调制装置调制光线并出射图像光，所述图像光穿过所述镜头装置照射至投影屏幕形成投影图像画面；
所述控制装置以及用于控制所述图像采集装置采集投影图像画面，并根据采集到的投影图像画面及测得的投影距离，计算所述投影图像画面在投影屏幕上的偏移方向及偏移量，以对所述投影图像画面的投影位置进行校正。
一种计算机可读存储介质，其中存储有计算机程序，所述计算机程序被执行时实现如上所述的投影方法。
本发明提供的投影设备采用所述投影方法，根据采集到的投影图像画面及测得的投影距离，计算投影图像画面在图像坐标系下的偏移方向及偏移量，并根据所述偏移方向及所述偏移量，实现所述投影图像画面进行校正。本发明中的投影设备采用所述投影方法不需要人工手动调节且无需经过多次对比调节，使用方便，有利于提高用户体验。
附图说明
为了更清楚地说明本发明实施例/方式技术方案，下面将对实施例/方式描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例/方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明第一实施方式提供的投影设备的结构示意图。
图2为图1所示的投影设备采用的投影方法的流程图。
图3为本发明第二实施方式提供的投影设备的结构示意图。
图4为图3所示的投影设备采用的投影方法的流程图。
主要元件符号说明
投影设备 100、200
壳体 110、210
镜头装置 120、220
图像采集装置 130
距离传感器 140
驱动装置 250
如下具体实施方式将结合上述附图进一步说明本发明。
具体实施方式
为了能够更清楚地理解本发明的上述目的、特征和优点，下面结合附图和具体实施例对本发明进行详细描述。需要说明的是，在不冲突的情况下，本申请的实施例及实施例中的特征可以相互组合。
在下面的描述中阐述了很多具体细节以便于充分理解本发明，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本发明。
本发明提供一种投影方法及投影设备，所述投影设备应用所述投影方法，无需人工手动调节且无需经过多次对比调节，可以方便的使用投影仪实现自动的投影图像画面校正。
请参阅图1，为本发明第一实施方式提供的投影设备100结构示意图。投影设备100，包括壳体110、设置于壳体表面的镜头装置120、图像采集装置130、距离传感器140、及设置于壳体110内部的控制装置(图未示)及光调制装置(图未示)。其中，所述控制装置用于控制所述光调制装置调制光线并出射图像光，所述图像光穿过镜头装置 120照射至屏幕形成投影图像画面；所述控制装置还用于控制图像采集装置130采集投影图像画面，控制距离传感器140测量投影距离，以及采用本发明提供的投影方法进行图像校正。
具体地，所述光调制装置为LCD(Liquid Crystal Display，液晶显示器)、LCOS(Liquid Crystal on Silicon，即液晶附硅，也叫硅基液晶)、DMD(Digital Mirror Device，Digital Micromirror Device，数字微镜元件)中的一种。一般地，投影设备100还包括光源装置(图未示)，所述光源装置用于出射光线至所述光调制装置，所述光调制装置包括用于进行光调制的调制区域，所述调制区域中设置有阵列式排布的用于调制光线的多个像素，所述调制区域用于对入射光线进行调制并出射所述图像光。所述调制区域出射的光线穿过镜头装置120在投影屏幕上形成一投影图像画面。
本发明实施方式中，不限定镜头装置120的结构。一般地，镜头装置120包括多个透镜。在一种实施方式中，镜头装置120包括：一反射镜群、具有正屈光度的一第一透镜群及一第二透镜群。其中，所述第二透镜群具有正屈光度且配置于所述第一透镜群的远离所述光调制装置的一侧，所述第二透镜群包括多个透镜。当所述光调制装置出射的图像光经过镜头装置120时，能使所述图像光穿越所述第一透镜群的光轴，并穿越所述第二透镜群的光轴，且所述第二透镜群所产生的一视场角小于100度。所述反射镜群具有负反射屈光度，且位于所述第二透镜群的远离所述第一透镜群的一侧，所述反射镜具有一反射曲面，用以反射通过所述第二透镜群后的图像光。镜头装置120由于所述第一透镜群、所述第二透镜群及反射镜群的配置，通过所述反射镜群提供广角镜群的功能，使得镜头装置120能在维持良好成像质量的前提下，整体的体积得以缩减，而生产成本也得以降低。
图像采集装置130包括电路板、图像传感器、滤光片和镜头组件，所述图像传感器贴装到所述电路板中部，所述图像传感器周边的电路板上具有被动元件以及连接图像传感器与被动元件的金线，所述图像传感器的非感光区上形成有一圈包围所述图像传感器的感光区的环形 挡边，所述环形挡边外的图像传感器及电路板上通过塑封材料形成有一将所述被动元件及金线包覆在内的塑封体，所述塑封体上侧中部形成有下沉凹槽，所述滤光片周边贴装到所述下沉凹槽内；所述镜头组件安装于所述塑封体的上侧。图像采集装置130为滤光片直接贴合式小型化图像采集装置，通过在图像传感器周边非感光区一周进行点胶并进行干胶，形成一环形挡边，能够阻挡模塑时塑封材料进入图像传感器的感光区，并可防止模塑时模具压伤图像传感器的感光区；通过塑封材料形成的塑封体将所述图像传感器非感光区及四周的被动元件、金线全部浇铸在一起，形成一个整体结构，与传统支架与电路板结合相比，减少了支架所占用空间，从而达到了减小摄像模组尺寸的目的，且增强了产品的可靠性。
距离传感器140包括红外线测距装置或激光测距装置中的一种。在一种实施方式中，距离传感器140采用相位法测量投影距离，即距离传感器140对发出的光线进行幅度调制并测定出射光线往返一次所述产生的相位延迟，再根据出射光线的波长，换算所述相位延迟所代表的距离。在一种实施方式中，距离传感器140采用脉冲法测量第一距离，即距离传感器140对发出的光线经所述投影屏幕的反射后又被距离传感器140接收，距离传感器140记录所述光线往返的时间。根据出射光线的波长，换算出对应所述投影距离的测距结果。另外，距离传感器140可以包括测距传感器与处理器，所述处理器对所述测距传感器的输出信号进行处理得到所述投影距离。在另一种实施方式中，距离传感器140包括测距传感器，投影设备100中的控制装置对所述测距传感器的输出信号进行处理得到所述投影距离。
进一步地，投影设备100中的控制装置可以是单片机、中央处理单元(Central Processing Unit，CPU)，还可以是其他通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现成可编程门阵列(Field-Programmable Gate Array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处 理器或者所述处理器也可以是任何常规的处理器等。
请参阅图2，为如图1所示的投影设备100采用的投影方法的流程图。本发明中的投影方法根据采集到的投影图像画面及测得的投影距离，计算所述投影图像画面在所述投影屏幕上的偏移方向及偏移量，并根据所述偏移方向及所述偏移量，对所述投影图像画面的投影位置进行校正。进一步地，将所述投影图像画面在所述投影屏幕上的偏移量转换为所述光调制装置中调制图像的偏移像素量，或者转换为镜头装置120的光轴偏移所述投影图像画面中心轴轴线的偏移量，并根据所述调制图像的偏移像素量或者所述光轴偏移所述投影图像画面中心轴轴线的偏移量，对所述投影图像画面的投影位置进行校正。相应地，所述控制装置用于将所述投影图像画面在所述投影屏幕上的偏移量转换为所述光调制装置中调制图像的偏移像素量，或者转换为镜头装置120的光轴偏移所述投影图像画面中心轴轴线的偏移量，并根据所述调制图像的偏移像素量或者所述光轴偏移所述投影图像画面中心轴轴线的偏移量，对所述投影图像画面的投影位置进行校正。
在本实施方式中，利用所述控制装置，实现上述投影方法，包括以下步骤：
S101：根据采集到的投影图像画面及测得的投影距离，计算所述投影图像画面在投影屏幕上的偏移方向及偏移量。
在步骤S101之前，还可以通过图像采集装置130采集投影到所述投影屏幕的投影图像画面，基于所述投影屏幕的边框位置判断所述投影图像画面是否有偏移。若存在偏移，则执行步骤S101，若不存在偏移，则根据指令判断采集到的下一帧投影图像画面是否有偏移。
本发明实施方式中，图像采集装置130用于采集所述投影图像画面，距离传感器140用于测得所述投影距离，所述控制装置用于根据采集到的投影图像画面及测得的投影距离，计算所述投影图像画面在所述投影屏幕上的偏移方向及偏移量。
在一种优选的实施方式中，图像采集装置130设置于镜头装置120的顶部，距离传感器140设置于镜头装置120的底部，可以理解的是， 图像采集装置130与距离传感器140还可以邻近设置，或者设置于镜头装置120的其他位置。
需要说明的是，在本发明实施方式中，所述投影屏幕包括边框，边框内区域尺寸为X*Y，则理想情况下，所述投影图像画面在所述投影屏幕中的尺寸为X*Y，单位为长度单位，比如mm或cm。可以理解的是，在其他实施方式中，边框内区域尺寸可以大于X*Y，投影图像画面与所述边框之间还设置有间隔。
根据图像采集装置130中相邻感光单元间距Δp、放大率β以及探测到的投影图像画面与所述投影屏幕边框间的距离ΔP与ΔQ，计算得到所述投影图像画面在所述投影屏幕上的偏移量Δx与Δy。图像采集装置130中包括阵列排布的多个感光单元，每个感光单元用于将入射的光信号转换为相应的电信号。相邻感光单元的间距为Δp，图像采集装置130探测到的投影图像的偏移像素量为ΔP*ΔQ，具有像素单位。ΔP与ΔQ是指所述控制装置采集到的投影图像画面中，探测到的投影图像画面与所述投影屏幕边框间的距离，
Δx＝ΔP*Δp*β；
Δy＝ΔQ*Δp*β。
本实施方式中，投影距离为测得的图像采集装置130与所述投影屏幕间的距离L，图像采集装置130的焦距为f，其中透镜组件的光学长度为d，前焦距为f1，后焦距为f2，上述参数均为已知量，则能够计算出图像采集装置130的图像放大率β：
Figure PCTCN2019076639-appb-000001
A＝L-d-f1-f2。
根据以上各式，根据采集到的投影图像画面及测得的投影距离L，进一步的，是根据投影设备100中图像采集装置130相邻感光单元间距Δp、放大率β，以及探测到的投影图像画面与所述投影屏幕边框间的距离ΔP与ΔQ，计算得到所述投影图像画面在所述投影屏幕上的偏移 量Δx与Δy。
S102：将所述投影图像画面在所述投影屏幕上偏移量Δx、Δy转换为所述光调制装置中调制图像的偏移像素量ΔS、ΔT。
具体地，根据所述投影图像画面的尺寸X、Y及偏移量Δx、Δy，及所述调制区域中像素的数量M*N，计算得到所述调制图像的偏移像素量ΔS、ΔT，如下公式所示：
Figure PCTCN2019076639-appb-000002
Figure PCTCN2019076639-appb-000003
S103：根据所述调制图像的偏移像素量对所述调制图像进行压缩处理，然后控制经压缩处理的调制图像在所述光调制装置的调制区域中沿与所述投影图像画面偏移方向相反的方向移动。
移动后的调制区域出射的图像光穿过镜头装置120成像于所述投影屏幕，所述投影图像画面完全落入所述投影屏幕边框围成的区域中。
本发明实施方式中提供的投影设备100采用所述投影方法，根据采集到的投影图像画面及测得的投影距离，计算投影图像画面在所述投影屏幕上的偏移方向及偏移量，并根据所述偏移方向及所述偏移量，计算得到对应的光调制装置中的调制图像的偏移像素量，从而实现所述投影图像画面的投影位置进行校正。投影设备100采用所述投影方法不需要人工手动调节并且不需要多次对比调节，使用方便，有利于提高用户体验。
请参阅图3，为本发明第二实施方式提供的投影设备200的结构示意图。本发明实施方式提供的投影设备200与投影设备100的区别主要在于，投影设备200还包括连接于镜头装置220及控制装置之间的驱动装置250。所述控制装置根据镜头装置200的光轴偏移所述投影图像画面中心轴轴线的偏移量发出控制信号，驱动装置250根据所述控制信号驱动镜头装置220的光轴超所述投影图像画面中心轴轴线的方向移动。需要说明的是，在本发明的精神或基本特征的范围内， 适用于第一实施方式中的各具体方案也可以相应的适用于第二实施方式中，为节省篇幅及避免重复起见，在此就不再赘述。
请参阅图本实施方式中的投影方法，与所述第一实施方式相同的是，根据投影图像画面在所述投影屏幕上的偏移方向及偏移量，对所述投影图像画面的投影位置进行校正。
请参阅图4，为图3所示的投影设备200采用的投影方法流程图。本发明中的投影方法，包括将所述投影图像画面在所述投影屏幕上的偏移量转换为所述光调制装置中调制图像的偏移像素量，或者转换为镜头装置220的光轴偏移所述投影图像画面中心轴轴线的偏移量，并根据所述调制图像的偏移像素量或者所述光轴偏移所述投影图像画面中心轴轴线的偏移量，对所述投影图像画面的投影位置进行校正。相应地，所述控制装置用于将所述投影图像画面在所述投影屏幕上的偏移量转换为所述光调制装置中调制图像的偏移像素量，或者转换为镜头装置220的光轴偏移所述投影图像画面中心轴轴线的偏移量，并根据所述调制图像的偏移像素量或者所述光轴偏移所述投影图像画面中心轴轴线的偏移量，对所述投影图像画面的投影位置进行校正。
在本实施方式中，所述投影方法，包括：
S201：根据采集到的投影图像画面及测得的投影距离，计算所述投影图像画面在所述投影屏幕上的偏移方向及偏移量Δx、Δy。步骤S201与步骤S101相同，在这里不做赘述。
S202：将所述投影图像画面在所述投影屏幕上的偏移量Δx、Δy，转换为镜头装置220的光轴偏移所述投影图像画面中心轴轴线的偏移量Δu、Δv。
根据光调制装置的像素间隔Δq、用于调制图像的像素数量M*N，及所述投影图像画面的尺寸X、Y，计算得到镜头装置220的放大率γ，
γ＝X/(Δq*M)。
根据所述投影图像画面在所述投影屏幕上的偏移量Δx、Δy，及镜头装置220的放大率γ，计算得到所述光轴偏移所述投影图像画面中 心轴轴线的偏移量Δu、Δv：
Δu＝Δx/γ
Δv＝Δy/γ。
S203：根据所述光轴偏移所述投影图像画面中心轴轴线的偏移量，驱动镜头装置220的光轴朝所述投影图像画面中心轴轴线的方向移动。
在一种实施方式中，所述控制装置计算得到所述光轴偏移所述投影图像画面中心轴轴线的偏移量后，输出与所述光轴偏移所述投影图像画面中心轴轴线的偏移量对应的脉冲信号。
其中，驱动装置250包括驱动芯片及步进马达，所述驱动芯片根据所述脉冲信号输出对应的驱动信号，所述步进马达接收所述驱动信号带动镜头装置220移动。移动后的镜头装置220成像于投影屏幕，所述投影图像画面完全落入所述投影屏幕的边框围成的区域中。
本实施方式中，投影设备200采用上述投影方法，根据采集到的投影图像画面及测得的投影距离，计算所述投影图像画面在所述投影屏幕上的偏移方向及偏移量，并根据所述投影图像画面在所述投影屏幕上偏移量，计算得到镜头装置220的光轴偏移所述投影图像画面中心轴轴线的偏移量，从而实现对所述投影图像画面的投影位置进行校正。投影设备200采用所述投影方法不需要人工手动调节并且不需要多次对比调节，使用方便，有利于提高用户体验。
以上步骤中的标号S101-S103及S201-S203，不用于限定步骤之间的先后顺序，步骤之间的顺序可以相互调换，在上述步骤之间还可以添加其他步骤或删除相应步骤。
本发明还提供一种计算机可读存储介质，其中存储有计算机程序，所述计算机程序被执行时实现如上所述的投影方法。
对于本领域技术人员而言，显然本发明不限于上述示范性实施例的细节，而且在不背离本发明的精神或基本特征的情况下，能够以其他的具体形式实现本发明。因此，无论从哪一点来看，均应将实施例看作是示范性的，而且是非限制性的，本发明的范围由所附权利要求 而不是上述说明限定，因此旨在将落在权利要求的等同要件的含义和范围内的所有变化涵括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。此外，显然“包括”一词不排除其他单元或步骤，单数不排除复数。装置权利要求中陈述的多个装置也可以由同一个装置或系统通过软件或者硬件来实现。第一，第二等词语用来表示名称，而并不表示任何特定的顺序。
最后应说明的是，以上实施例仅用以说明本发明的技术方案而非限制，尽管参照较佳实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或等同替换，而不脱离本发明技术方案的精神和范围。

Claims (14)

  1. 一种投影方法，其特征在于，包括以下步骤：
    根据采集到的投影图像画面及测得的投影距离，计算所述投影图像画面在投影屏幕上的偏移方向及偏移量，并根据所述偏移方向及所述偏移量，对所述投影图像画面的投影位置进行校正。
  2. 如权利要求1所述的投影方法，其特征在于，所述根据采集到的投影图像画面及测得的投影距离，计算所述投影图像画面在投影屏幕上的偏移方向及偏移量，并根据所述偏移方向及所述偏移量，对所述投影图像画面的投影位置进行校正包括：
    将所述投影图像画面在所述投影屏幕上的偏移量转换为光调制装置中调制图像的偏移像素量，或者转换为镜头装置的光轴偏移所述投影图像画面中心轴轴线的偏移量，并根据所述调制图像的偏移像素量或者所述光轴偏移所述投影图像画面中心轴轴线的偏移量，对所述投影图像画面的投影位置进行校正。
  3. 如权利要求2所述的投影方法，其特征在于，所述将所述投影图像画面在所述投影屏幕上的偏移量转换为光调制装置中调制图像的偏移像素量，或者转换为镜头装置的光轴偏移所述投影图像画面中心轴轴线的偏移量，并根据所述调制图像的偏移像素量或者所述光轴偏移所述投影图像画面中心轴轴线的偏移量，对所述投影图像画面的投影位置进行校正包括：
    将所述投影图像画面在所述投影屏幕上的偏移量转换为所述光调制装置中调制图像的偏移像素量；
    根据所述调制图像的偏移像素量对所述调制图像进行压缩处理，然后控制经压缩处理的调制图像在所述光调制装置的调制区域中沿与所述投影图像画面偏移方向相反的方向移动。
  4. 如权利要求3所述的投影方法，其特征在于，
    所述将所述投影图像画面在所述投影屏幕上的偏移量转换为光调制装置中调制图像的偏移像素量包括：
    根据所述投影图像画面的尺寸及偏移量，以及所述调制区域中像素的数量，计算得到所述调制图像的偏移像素量。
  5. 如权利要求2所述的投影方法，其特征在于，所述将所述投影图像画面在所述投影屏幕上的偏移量转换为光调制装置中调制图像的偏移像素量，或者转换为镜头装置的光轴偏移所述投影图像画面中心轴轴线的偏移量，并根据所述调制图像的偏移像素量或者所述光轴偏移所述投影图像画面中心轴轴线的偏移量，对所述投影图像画面的投影位置进行校正包括：
    将所述投影图像画面在所述投影屏幕上的偏移量，转换为所述镜头装置的光轴偏移投影图像画面中心轴轴线的偏移量；
    根据所述光轴偏移所述投影图像画面中心轴轴线的偏移量，驱动所述镜头装置的光轴朝所述投影图像画面中心轴轴线方向移动。
  6. 如权利要求5所述的投影方法，其特征在于，
    所述将所述投影图像画面在所述投影屏幕上的偏移量，转换为镜头装置的光轴偏移投影图像画面中心轴轴线的偏移量包括：
    根据光调制装置的像素间隔、用于调制图像的像素数量、以及所述投影图像画面的尺寸，计算得到所述镜头装置的放大率；
    根据所述投影图像画面在所述投影屏幕上的偏移量及所述镜头装置的放大率，计算得到所述光轴偏移所述投影图像画面中心轴轴线的偏移量。
  7. 如权利要求1-6任意一项所述的投影方法，其特征在于，
    所述根据采集到的投影图像画面及测得的投影距离，计算所述投影图像画面在投影屏幕上的偏移方向及偏移量包括：
    根据图像采集装置中相邻感光单元间距、放大率以及探测到的投影图像画面与所述投影屏幕边框间的距离，计算得到所述投影图像画面在所述投影屏幕上的偏移量。
  8. 如权利要求7所述的投影方法，其特征在于，
    所述根据图像采集装置中相邻感光单元间距、放大率以及探测到的投影画面与所述投影屏幕边框间的距离，计算得到所述投影图像画 面在所述投影屏幕上的偏移量包括：
    根据所述图像采集装置与所述投影屏幕间的距离及图像采集装置的光学参数，计算得到所述图像采集装置的放大率。
  9. 如权利要求1所述的投影方法，其特征在于，在所述根据采集到的投影图像画面及测得的投影距离，计算所述投影图像画面在投影屏幕上的偏移方向及偏移量，并根据所述偏移方向及所述偏移量，对所述投影图像画面的投影位置进行校正之前还包括：
    通过图像采集装置采集投影到所述投影屏幕的投影图像画面，基于所述投影屏幕的边框位置判断所述投影图像画面是否有偏移。
  10. 一种投影设备，其特征在于，包括壳体、设置于所述壳体表面的镜头装置、图像采集装置、距离传感器、及设置于所述壳体内部的控制装置及光调制装置；
    其中，所述控制装置用于控制所述距离传感器测量投影距离；
    所述控制装置还用于控制所述光调制装置调制光线并出射图像光，所述图像光穿过所述镜头装置照射至投影屏幕形成投影图像画面；
    所述控制装置以及用于控制所述图像采集装置采集投影图像画面，并根据采集到的投影图像画面及测得的投影距离，计算所述投影图像画面在投影屏幕上的偏移方向及偏移量，以对所述投影图像画面的投影位置进行校正。
  11. 如权利要求10所述的投影设备，其特征在于，所述控制装置用于将所述投影图像画面在所述投影屏幕上的偏移量转换为所述光调制装置中调制图像的偏移像素量，或者转换为所述镜头装置的光轴偏移所述投影图像画面中心轴轴线的偏移量，并根据所述调制图像的偏移像素量或者所述光轴偏移所述投影图像画面中心轴轴线的偏移量，对所述投影图像画面的投影位置进行校正。
  12. 如权利要求11所述的投影设备，其特征在于，所述控制装置将所述投影图像画面在所述投影屏幕上的偏移量，转换为所述光调制装置中调制图像的偏移像素量，以及根据所述调制图像的偏移像素量对所述调制图像进行压缩处理，然后控制经压缩处理的调制图像在所 述光调制装置的调制区域中沿与所述投影图像画面偏移方向相反的方向移动。
  13. 如权利要求11所述的投影设备，其特征在于，还包括驱动装置；所述控制装置将所述投影图像画面在所述投影屏幕上的偏移量，转换为所述镜头装置的光轴偏移所述投影图像画面中心轴轴线的偏移量，并根据所述光轴偏移所述投影图像画面中心轴轴线的偏移量，通过所述驱动装置驱动所述镜头装置朝所述投影图像画面中心轴轴线的方向移动。
  14. 一种计算机可读存储介质，其中存储有计算机程序，其特征在于，所述计算机程序被执行时实现如权利要求1-9任意一项所述的投影方法。
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