WO2019134263A1 - 自动对焦方法、自动对焦系统以及投影设备 - Google Patents

自动对焦方法、自动对焦系统以及投影设备 Download PDF

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Publication number
WO2019134263A1
WO2019134263A1 PCT/CN2018/080871 CN2018080871W WO2019134263A1 WO 2019134263 A1 WO2019134263 A1 WO 2019134263A1 CN 2018080871 W CN2018080871 W CN 2018080871W WO 2019134263 A1 WO2019134263 A1 WO 2019134263A1
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Prior art keywords
motor
control module
image
focus
speed operation
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English (en)
French (fr)
Inventor
陈攀
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G03B13/34—Power focusing
    • G03B13/36—Autofocus systems
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/142—Adjusting of projection optics
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/53—Means for automatic focusing, e.g. to compensate thermal effects

Definitions

  • the present invention relates to the field of optics, and in particular to an autofocus method, an autofocus system, and a projection device.
  • Focusing on the lens is an important factor affecting optical products. Since the manual focus mode of the transmission is inconvenient to operate and requires manual operation and judging whether the focus is clear, the autofocus scheme is gradually favored by the market.
  • the existing autofocus scheme usually uses motor-driven lens shift to achieve focusing, and the prior art motor drive The speed of the lens is uniform. On the one hand, the motor starts at a high load. If the motor is running at a constant speed, the large torque will cause a large loss to the motor, which will easily reduce the life of the motor. On the other hand, the lens autofocus will be increased. The time consumption is also not conducive to precise control of the displacement of the motor-driven lens.
  • the technical problem to be solved by the present invention is to provide an autofocus method, system and projection device, which is simple, fast and effective in focusing, can reduce wear of the motor, and has a good user experience.
  • an auto focus system including:
  • a reference image display module for projecting an image onto the image to be displayed to implement display of the image
  • An image capturing module for extracting an image in a current state
  • An image analysis module configured to analyze the sharpness of the image captured by the image capturing module, thereby determining whether the current position is in focus
  • a focus control module for controlling focus adjustment of the system
  • the autofocus system includes a motor that drives a lens to move along an optical axis thereof, the focus control module causes an operation state of at least two different frequencies at the motor, and the focus control module controls the motor during the adjustment of the focus Operate under different working conditions and control the motor to complete the switching of different working states.
  • the focus control module includes a speed control module for controlling a running frequency of the motor.
  • the focus control module completes switching of different working states of the motor by speeding up or slowing down the running frequency of the motor.
  • the focus control module includes a low speed control module that controls low speed operation of the motor and a high speed control module that controls the motor at a high speed, the focus control module is in the low speed control module and the high speed control according to different states of the adjusted focus. Switch between modules.
  • another technical solution adopted by the present invention is to provide a projection apparatus including the autofocus system as described above.
  • an autofocus method for an autofocus system as described above, characterized in that the autofocus method comprises the following steps:
  • the system initializes and confirms the zero position of the lens and the farthest distance of the lens
  • the control motor drives the lens to move between the farthest distance position and the zero point position.
  • the image is extracted by the image capturing module at every corresponding distance, and the image analysis module analyzes the sharpness of the extracted image to confirm the clearest position;
  • the motor drives the lens to move to the clearest position, including controlling the motor to switch to the high-speed operation to move to the clearest position; when approaching the clearest position, the control motor switches to the low-speed operation state to move to the clearest position to complete the focus adjustment.
  • the step of moving the motor to the clearest position comprises first moving to the zero position, moving from the zero position to the farthest distance position, and then moving from the farthest distance position to the clearest position.
  • the method of controlling the motor to switch to the high-speed operation state is: first, controlling the motor to perform a low-speed constant-speed operation, and controlling the motor to accelerate once every time the motor reaches a set angle until the motor reaches the set high-speed operation state.
  • the method for controlling the motor to switch the lens to the low speed running state is: controlling the motor to speed up once after each running to a set angle until the motor reaches the operating frequency of the set low speed running state.
  • the set angle is 18°
  • the operating frequency of the low speed operation state set by the motor is 200 Hz
  • the operating frequency of the high speed operation state set by the motor is 1000 Hz.
  • the method of confirming the clearest position is an image ladder calculation method.
  • the invention has the beneficial effects that the autofocus method, the system and the projection device are different from the prior art, and the focus control module of the autofocus system has at least two working states for causing the motor to have different speeds. During the adjustment of the focus, the focus control module controls the motor to operate under different operating states and controls the motor to switch between different working states. Focusing is simple, fast and effective, reducing motor wear and has a good user experience.
  • FIG. 1 is a schematic structural view of an autofocus system of the present invention
  • FIG. 4 is a schematic structural view of another embodiment of the autofocus system of the present invention.
  • the invention provides an autofocus method, a system and a projection device, which solve the problem that the focus adjustment is inconvenient in the prior art, and the motor is easy to wear for a long time.
  • the autofocus system of the present invention includes a reference image display module 1, an image capture module 2, an image analysis module 3, and a focus control module 4.
  • the reference image display module 1 is used to project an image to the image to be displayed to realize the display function of the image. Specifically, the reference image of the reference focus image is projected onto the wall or the canvas by the optical machine to form a reference image.
  • the reference image is used for photographing by the image capture module for distance calculation, analysis of speed and quality, and a simple black-and-white or black-and-white image can be used.
  • the image capturing module 2 is configured to extract an image in a current state. Specifically, the image information projected by the reference image display module is acquired by photographing the camera, and the acquired image information is transmitted to the image analyzing module 3.
  • the image analysis module 3 is configured to analyze the sharpness of the image captured by the image capturing module 2, thereby determining whether the current position is in focus; specifically, in the embodiment, the image analysis module 3 uses the image gradient calculation algorithm to determine the image clarity. The clearest position.
  • the focus control module 4 is used to integrate the reference image display module 1, the image capture module 2, and the image analysis module 3 and control the focus adjustment of the system.
  • the focus control module 4 has at least two operating states for causing the motor to be at different frequencies. During the adjustment of the focus, the focus control module 4 controls the motor to operate in different operating states and controls the motor to switch between different operating states.
  • the focus control module 4 includes a speed control module 41 for controlling the operating frequency of the motor. During the adjustment of the focus, the focus control module 4 completes the state switching of the different stages of adjusting the focus by changing the motor operating frequency. In the present embodiment, there is only one speed control module 41, and the speed control module 41 can either bring the lens into a high-speed operation state by speeding up the motor, or can switch the lens in the high-speed operation state to the low-speed operation state by decelerating.
  • the speed increasing rule is that the speed control module 41 controls the high speed operation state that the motor is increased to the set frequency once the operating angle is greater than or equal to a set angle C°; correspondingly, the speed reduction rule is the speed control module 41.
  • the control motor is operated for an angle greater than or equal to a set angle C°, the speed is decelerated once and the speed is reduced to a low speed operation state of the set frequency.
  • the set angle C is 18°
  • the operating frequency of the low speed operation state set by the motor is 200 Hz
  • the operating frequency of the high speed operation state set by the motor is 1000 Hz.
  • the one-step motor has a rotation angle of 9°.
  • the motor needs to start with a large torque, so that the motor can be fixed at 200Hz for low-speed constant speed operation, in order to drive the lens to move, and then each time the angle is greater than or equal to 18°, the speed is increased once, and the motor is gradually speeded up.
  • the motor needs to be decelerated when approaching the end point.
  • the angle of rotation is decelerated every time greater than or equal to 18°, and the speed is gradually reduced to 200Hz.
  • the reason for the slow deceleration is because each time the motor is near stop and At the initial start, the motor needs to be at a fixed speed of low speed. In the present embodiment, it is 200 Hz, so that the motor can be prevented from being out of control due to a sudden stop of the motor at high speed.
  • the motor is reduced from high speed to low speed mainly depending on the friction between the nut and the motor screw.
  • the autofocus method of the present invention comprises the following steps:
  • the system initializes and initializes the reference image display module 1, the image capturing module 2, the image analyzing module 3, the focus control module 4, and components such as a camera, a motor, and the like, and projects a reference image by referring to the display module 1.
  • the distance between the zero position and the farthest distance position is the movable travel distance M of the lens, specifically in the embodiment, 152 steps, that is, 152 motor pulses;
  • the focus control module 4 controls the motor to drive the lens to move from the farthest distance position to the zero position.
  • the image is taken by the camera of the image capturing module to obtain the extracted image, and the image is obtained.
  • the image analysis module analyzes the sharpness of the extracted image to confirm the clearest position N.
  • the method of confirming the clearest position is the image ladder calculation method.
  • the step of moving the motor to the clearest position includes first moving the lens to the zero position, moving from the zero position to the farthest distance position M, and then moving from the distance M to the zero point, the speed during the moving process. Adjust the corresponding speed reduction or speed increase.
  • the motor frequency adjustment process as shown in FIG. 3 is included, that is, the motor is first initialized and the motor is operated in a low speed operation state, and then the speed up program is entered, that is, the speed control module 41 controls.
  • the present embodiment is an improvement based on the foregoing autofocus system, which is substantially the same as the foregoing embodiment, and the autofocus system includes a reference image display.
  • the module 1, the image capturing module 2, the image analyzing module 3, and the focus control module 4 differ only in that, in the present embodiment, there are two speed control modules, including a low speed control module 411 that controls the low speed operation of the motor and a high speed operation of the control motor.
  • the high speed control module 412, the focus control module 4 switches between the low speed control module and the high speed control module according to different states of the adjusted focus, thereby realizing the speed increase or decrease of the motor.
  • the invention also provides a projection device comprising the above-mentioned auto-focus system, which can realize auto-focusing, reduce the focusing time, and at the same time accurately focus, improve product life, convenient use and high reliability.
  • the present invention provides an autofocus system, a method, and a projection device.
  • the focus control module of the autofocus system has at least two working states for causing the motor to have different speeds, in the case of the prior art. During the adjustment of the focus, the focus control module controls the motor to operate under different operating states and controls the motor to switch between different working states. Focusing is simple, fast and effective, reducing motor wear and has a good user experience.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

一种具有自动对焦系统的投影设备，自动对焦系统的对焦控制模块（4）使马达具有不同速度的至少两种工作状态。在调节对焦的过程中，对焦控制模块（4）控制马达在不同工作状态下运转，并控制马达完成不同工作状态的切换。调焦快速有效，并能降低马达的磨损。

Description

自动对焦方法、自动对焦系统以及投影设备 技术领域
本发明涉及光学领域，尤其是涉及一种自动对焦方法、自动对焦系统以及投影设备。
背景技术
镜头的对焦是影响光学产品的重要性能。由于传动的手动对焦方式操作不方便，需要人工操作及判断是否对焦清晰，因此自动对焦方案逐渐受到市场的青睐，现有的自动对焦方案通常采用马达驱动镜头移动实现对焦，现有技术中马达驱动镜头的速度是匀速的，一方面，马达起步阶段，负载较大，若采用匀速运转，较大的扭矩会对马达造成较大损耗，容易降低马达的寿命，另一方面，增加了镜头自动对焦的耗时，也不利于精确控制马达驱动镜头的位移。
因此，实有必要提供一种新的自动对焦系统、自动对焦方法以及投影设备以解决上述问题。
发明内容
本发明主要解决的技术问题是提供一种自动对焦方法、系统以及投影设备，调焦简单且快速有效，能够降低马达的磨损，具有良好的用户体验。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种自动对焦系统，包括：
参考图像显示模块，用于将图像投射到待显示图像处实现图像的显示；
图像摄取模块，用于提取当前状态下的图像；
图像分析模块，用于分析图像摄取模块摄取到的图像的清晰度，从 而判断当前位置是否对焦清晰；
对焦控制模块，用于控制实现系统的对焦调节；
所述自动对焦系统包括驱动镜头沿其光轴方向移动的马达，所述对焦控制模块使马达处的至少两种不同频率的工作状态，在调节对焦的过程中，所述对焦控制模块控制马达在不同工作状态下运转，并控制马达完成不同工作状态的切换。
优选的，所述对焦控制模块包括用于控制马达运转频率的速度控制模块，在调节对焦过程中，所述对焦控制模块通对马达运转频率的提速或降速完成马达不同工作状态切换。
优选的，所述对焦控制模块包括控制马达低速运转的低速控制模块和控制马达高速的高速控制模块，所述对焦控制模块根据所处调节对焦的不同状态在所述低速控制模块和所述高速控制模块之间切换。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种投影设备，包括如上所述的自动对焦系统。
为解决上述技术问题，本发明采用的另一个技术方案是：提供5.一种如上所述的自动对焦系统的自动对焦方法，其特征在于，自动对焦方法包括如下步骤：
系统初始化，并确认镜头的零点位置和镜头的最远距离位置；
控制马达带动镜头在最远距离位置和零点位置之间移动，在移动过程中，每隔相应距离通过图像摄取模块提取图像，并通过图像分析模块分析提取图像的清晰度，确认最清晰位置；
马达带动镜头移动到最清晰位置，包括控制马达切换到高速运转状态向最清晰位置移动；在接近最清晰位置时，控制马达切换到低速运转状态移动到最清晰位置完成对焦调节。
优选的，所述马达移动到最清晰位置的步骤包括：首先移动到零点位置，再从零点位置移动到最远距离位置，然后从最远距离位置移动到最清晰位置。
优选的，控制马达切换到高速运转状态的方法为：首先控制马达进行低速匀速运转，控制马达每运转到一设定角度后提速一次，直到马达 达到设定的高速运转状态的运转频率。
优选的，控制马达带动所述镜头切换到低速运转状态的方法为：控制马达每运转到一设定角度后提速一次，直到马达达到设定的低速运转状态的运转频率。
优选的，所述设定角度为18°，马达设定的低速运转状态的运转频率为200Hz，马达设定的高速运转状态的运转频率为1000Hz。
优选的，确认最清晰位置的方法为图像阶梯计算方法。
本发明的有益效果是：区别于现有技术的情况，本发明提供一种自动对焦方法、系统以及投影设备，自动对焦系统的对焦控制模块具有使马达具有不同速度的至少两种工作状态，在调节对焦的过程中，所述对焦控制模块控制马达在不同工作状态下运转，并控制马达完成不同工作状态的切换。调焦简单且快速有效，能够降低马达的磨损，具有良好的用户体验。
附图说明
图1是本发明自动对焦系统的结构示意图；
图2是本发明自动对焦方法的流程图；
图3是本发明自动对焦系统中马达频率调节的流程图；
图4是本发明自动对焦系统另一种实施方式的结构示意图。
具体实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本发明提供一种自动对焦方法、系统以及投影设备，解决了现有技术中调焦不便，马达长时间运转容易磨损的问题。
请参阅图1，本发明的自动对焦系统包括参考图像显示模块1、图像摄取模块2、图像分析模块3和对焦控制模块4。
参考图像显示模块1用于将图像投射到待显示图像处实现图像的显示功能，具体的，为通过光机把参考对焦图片的画面投影出来到墙壁或者影布上形成参考图像。参考图像用于图像摄取模块拍照以便进行距离 计算，分析速度和质量，具体可以采用简单的黑字白底或黑底白字的图片。
图像摄取模块2用于提取当前状态下的图像，具体的，为通过摄像头拍照获取参考图片显示模块投射显示出的图像信息，并将获取的图像信息传递给图像分析模块3。
图像分析模块3用于分析图像摄取模块2摄取到的图像的清晰度，从而判断当前位置是否对焦清晰；具体在本实施方式中，图像分析模块3使用图像梯度计算算法图像的清晰度，判断图像的最清晰位置。
对焦控制模块4用于整合参考图像显示模块1、图像摄取模块2和图像分析模块3并控制实现系统的对焦调节。
对焦控制模块4具有使马达处于不同频率的至少两种工作状态，在调节对焦的过程中，对焦控制模块4控制马达在不同工作状态下运转，并控制马达完成不同工作状态的切换。
对焦控制模块4包括用于控制马达运转频率的速度控制模块41，在调节对焦过程中，所述对焦控制模块4通过改变马达运转频率完成对调节对焦的不同阶段的状态切换。在本实施方式中，速度控制模块41只有一个，速度控制模块41既可以通过对马达提速使镜头进入高速运转状态；也可以通过降速使处于高速运转状态的镜头切换到低速运转状态。
具体的，提速规律为速度控制模块41控制马达每次运转角度大于或等于一设定角度C°则提速一次一直提高至设定频率的高速运转状态；对应的，降速规律为速度控制模块41控制马达每次运转角度大于或等于一设定角度C°则减速一次一直降速至设定频率的低速运转状态。具体在本实施方式中，设定角度C为18°，马达设定的低速运转状态的运转频率为200Hz，马达设定的高速运转状态的运转频率为1000Hz。在低速运转状态下，1步马达的转角为9°。
在实际应用过程中，马达刚开始起步需要大扭力，让马达固定在200Hz进行低速匀速运转，才能带动镜头移动，然后每次经过转了角度大于或者等于18°，提速一次，依次让马达逐步提速到1000Hz运转，当即将接近终点时需要对马达进行减速，也是转的角度每大于或者等于 18°减速一次，逐步减速到马达运转频率为200Hz，逐渐减速的原因是因为每次马达在接近停止和启动初始时，马达都是需要处于低速固定频率的，在本实施方式中，为200Hz，这样，可以防止马达在高速运行突然停止而造成马达失控。
需要说明的是，马达从高速降为低速主要取决于螺母与马达螺杆间摩擦力，摩擦力的大小取决于摩擦系数，假设摩擦系数为μ，则马达需要降低速度距离S＝V*V/2gμ(g＝9.8m/s2)，也即“即将接近”需满足该距离S，即在距离终点还有S距离时，对马达进行逐渐减速至200Hz。
如图2所示，本发明自动对焦方法，包括如下步骤：
系统初始化，初始化参考图像显示模块1、图像摄取模块2、图像分析模块3、对焦控制模块4以及摄像头、马达等元件，通过参考显示模块1投射形成参考图像。
确认镜头的零点位置和镜头的最远距离位置，零点位置和最远距离位置之间的距离为镜头的可移动行程距离M，具体在本实施方式中，为152步，即152个马达脉冲；
对焦控制模块4控制马达带动镜头自最远距离位置移动到零点位置，在移动过程中，每隔相应距离，例如每移动1步或者2步，通过图像摄取模块的摄像头拍照获得提取图像，并通过图像分析模块分析提取图像的清晰度，确认最清晰位置N。具体在本实施方式中，确认最清晰位置的方法为图像阶梯计算方法。
马达带动镜头移动到最清晰位置N，包括控制马达切换到高速运转状态向最清晰位置移动；在接近最清晰位置时，即距离最清晰位置的距离S满足S＝V*V/2gμ，控制马达切换到低速运转状态移动到最清晰位置完成对焦调节。
具体在本实施方式中，马达带动镜头移动到最清晰位置步骤包括首先镜头移动到零点位置，再从零点位置移动到最远距离位置M，然后从距离M移动到零点，上述移动过程中的速度进行相应降速或提速的调整，具体请参照上文的相关描述，在此不再赘述。优选的，在上述每一次的移动过程中，均包括如图3所示的马达频率调节过程，即，首先初始化马达并使得马达以低速运转状态运转，随后进入提速程序，即速度 控制模块41控制马达每次运转角度大于或等于一设定角度C°则提速一次一直提高至设定频率的高速运转状态；当对焦控制模块4检测到即将接近移动终点，即距离终点的距离S满足S＝V*V/2gμ，则启动降速程序，即速度控制模块41控制马达每次运转角度大于或等于一设定角度C°则减速一次一直降速至设定频率的低速运转状态。
参照图4所示，为本发明自动对焦系统的另一种实施方式，本实施方式为在前述的自动对焦系统的基础上进行的改进，与前述实施方式大致相同，自动对焦系统包括参考图像显示模块1、图像摄取模块2、图像分析模块3和对焦控制模块4，区别仅在于，在本实施方式中，速度控制模块共有两个，包括控制马达低速运转的低速控制模块411和控制马达高速运转的高速控制模块412，对焦控制模块4根据所处调节对焦的不同状态在低速控制模块和高速控制模块之间切换，从而实现马达的提速或降速。
本发明还提供一种投影设备，其包括如上所述的自动对焦系统，可以实现自动对焦，减少对焦耗时，同时对焦精准，提高产品寿命，使用方便，可靠性能高。
本发明的有益效果是：区别于现有技术的情况，本发明提供一种自动对焦系统、方法及投影设备，自动对焦系统的对焦控制模块具有使马达具有不同速度的至少两种工作状态，在调节对焦的过程中，所述对焦控制模块控制马达在不同工作状态下运转，并控制马达完成不同工作状态的切换。调焦简单且快速有效，能够降低马达的磨损，具有良好的用户体验。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (10)

  1. 一种自动对焦系统，包括：
    参考图像显示模块，用于将图像投射到待显示图像处实现图像的显示；
    图像摄取模块，用于提取当前状态下的图像；
    图像分析模块，用于分析图像摄取模块摄取到的图像的清晰度，从而判断当前位置是否对焦清晰；
    对焦控制模块，用于控制实现系统的对焦调节；
    其特征在于，所述自动对焦系统包括驱动镜头沿其光轴方向移动的马达，所述对焦控制模块使马达处于至少两种不同频率的工作状态，在调节对焦的过程中，所述对焦控制模块控制马达在不同工作状态下运转，并控制马达完成不同工作状态的切换。
  2. 根据权利要求1所述的自动对焦系统，其特征在于，所述对焦控制模块包括用于控制马达运转频率的速度控制模块，在调节对焦过程中，所述对焦控制模块通对马达运转频率的提速或降速完成马达不同工作状态切换。
  3. 根据权利要求1所述的自动对焦系统，其特征在于，所述对焦控制模块包括控制马达低速运转的低速控制模块和控制马达高速运转的高速控制模块，所述对焦控制模块根据所处调节对焦的不同状态在所述低速控制模块和所述高速控制模块之间切换。
  4. 一种投影设备，其特征在于，包括如权利要求1到3任意一项所述的自动对焦系统。
  5. 一种自动对焦方法，其特征在于，采用如权利要求1到3任意一项所述的自动对焦系统，自动对焦方法包括如下步骤：
    系统初始化，确认镜头的零点位置和镜头的最远距离位置；
    控制马达带动镜头在最远距离位置和零点位置之间移动，在移动过程中，每隔相应距离通过图像摄取模块提取图像，并通过图像分析模块分析提取图像的清晰度，确认最清晰位置；
    马达带动镜头移动到最清晰位置，包括控制马达切换到高速运转状态向最清晰位置移动；在接近最清晰位置时，控制马达切换到低速运转状态移动到最清晰位置完成对焦调节。
  6. 根据权利要求5所述的自动对焦方法，其特征在于，所述马达带动所述镜头移动到最清晰位置的步骤包括：首先移动到零点位置，再从零点位置移动到最远距离位置，然后从最远距离位置移动到最清晰位置。
  7. 根据权利要求5所述的自动对焦方法，其特征在于，控制马达切换到高速运转状态的方法为：首先控制马达进行低速匀速运转，控制马达每运转到一设定角度后提速一次，直到马达达到设定的高速运转状态的运转频率。
  8. 根据权利要求7所述的自动对焦方法，其特征在于，控制马达切换到低速运转状态的方法为：控制马达每运转到一设定角度后提速一次，直到马达达到设定的低速运转状态的运转频率。
  9. 根据权利要求8所述的自动对焦方法，其特征在于，所述设定角度为18°，马达设定的低速运转状态的运转频率为200Hz，马达设定的高速运转状态的运转频率为1000Hz。
  10. 根据权利要求5所述的自动对焦方法，其特征在于，确认最清晰位置的方法为图像阶梯计算方法。
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115883804A (zh) * 2022-03-01 2023-03-31 深圳市当智科技有限公司 投影设备的对焦控制方法、投影设备和存储介质
CN117714878A (zh) * 2023-08-11 2024-03-15 荣耀终端有限公司 拍摄方法、电子设备及可读介质

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111679541A (zh) * 2020-07-16 2020-09-18 歌尔光学科技有限公司 投影模组的校准控制方法及系统、存储介质以及控制装置
CN112925159B (zh) * 2021-02-03 2022-03-15 湛江市视杰技术发展有限公司 一种改良焦距调节结构的投影装置及其控制方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004045725A (ja) * 2002-07-11 2004-02-12 Pentax Corp オートフォーカス電子内視鏡
CN102253569A (zh) * 2011-01-17 2011-11-23 深圳市保千里电子有限公司 一种摄像机聚焦的方法及装置
CN106707674A (zh) * 2015-11-17 2017-05-24 深圳市绎立锐光科技开发有限公司 投影设备的自动对焦方法及投影设备
CN107015420A (zh) * 2016-01-28 2017-08-04 奥林巴斯株式会社 镜头驱动装置和镜头驱动方法
CN107479168A (zh) * 2017-08-22 2017-12-15 深圳市芯智科技有限公司 一种能实现快速对焦功能的投影机及对焦方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4046276B2 (ja) * 2002-10-24 2008-02-13 富士フイルム株式会社 デジタルカメラ
CN103018881B (zh) * 2012-12-12 2016-01-27 中国航空工业集团公司洛阳电光设备研究所 一种基于红外图像的自动调焦方法及系统
CN106657777A (zh) * 2016-11-29 2017-05-10 武汉格物优信科技有限公司 一种红外热像仪自动对焦方法和系统

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004045725A (ja) * 2002-07-11 2004-02-12 Pentax Corp オートフォーカス電子内視鏡
CN102253569A (zh) * 2011-01-17 2011-11-23 深圳市保千里电子有限公司 一种摄像机聚焦的方法及装置
CN106707674A (zh) * 2015-11-17 2017-05-24 深圳市绎立锐光科技开发有限公司 投影设备的自动对焦方法及投影设备
CN107015420A (zh) * 2016-01-28 2017-08-04 奥林巴斯株式会社 镜头驱动装置和镜头驱动方法
CN107479168A (zh) * 2017-08-22 2017-12-15 深圳市芯智科技有限公司 一种能实现快速对焦功能的投影机及对焦方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115883804A (zh) * 2022-03-01 2023-03-31 深圳市当智科技有限公司 投影设备的对焦控制方法、投影设备和存储介质
CN117714878A (zh) * 2023-08-11 2024-03-15 荣耀终端有限公司 拍摄方法、电子设备及可读介质

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