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An automatic focusing method, device and projector

A technology of auto focus and projection lens, which is applied in projection devices, instruments, installations, etc. It can solve problems such as blurred projection images, slow focusing speed, and inability to solve errors, so as to achieve good visual effects and reduce the cost of scanning paths and time Effect

Active Publication Date: 2021-09-21
IVIEW DISPLAY SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventor found that there are at least the following problems in the above-mentioned related technologies: in the above-mentioned first method, every time the motor is moved, it is necessary to wait for the motor to stabilize, then wait for the image synchronization signal, and then take an image for image processing , the focusing speed is relatively slow; in the above-mentioned second method, since there is no detection device for imaging clarity, it is impossible to solve the errors existing between individuals
The existing autofocus method, whether it is based on the existing distance measurement for step calibration or using the projection lens to take pictures to judge the projector's autofocus, in order to achieve the best focusing effect, the motor will control the lens to return to the origin first Then go to the best position for focusing, and in this process, the projected image will have a process from blurring to clearing, sometimes it will shake twice, and the focusing time will be longer, which will affect the user's visual experience

Method used

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  • An automatic focusing method, device and projector
  • An automatic focusing method, device and projector
  • An automatic focusing method, device and projector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] figure 1 is a schematic flowchart of an autofocus method provided in this embodiment, figure 2 It is "determine the relative position of the maximum sharpness point according to the change characteristics of the sharpness of the first-scanned image and determine whether a second scan is required and the direction of the second scan" and "according to the second scan" described in this embodiment. The definition of the scanned image is determined and the projection lens is driven to move to the position of the maximum clear point", a schematic flow chart of the specific steps, image 3 These are the three variations of the clarity provided in Embodiment 1 of this application with each scanned image, please refer to figure 1 , figure 2 and image 3 , an autofocus method is provided in an embodiment of the present invention, the method includes but not limited to the following steps:

[0050] Step 110: Projecting an initialization picture on the initial point positi...

Embodiment 2

[0079] Figure 4 It is a schematic structural diagram of an autofocus device provided in Embodiment 2 of this application, please attend Figure 4 , the autofocus device 20 includes but is not limited to: a projection unit 21 , an image acquisition unit 22 , a sharpness calculation unit 23 , a sharpness comparison unit 24 , a judging unit 25 and a drive control unit 26 .

[0080] The above-mentioned projection unit 21 is used for projecting the initialization picture at the initial point position, and the projection unit 21 is also used for performing normal projection after the projection lens finishes auto-focusing.

[0081] The above-mentioned image acquisition unit 22 is used to acquire the first scan image, the image acquisition unit 22 is also used to acquire the initialization image and obtains the position of the projection area according to the initialization image, and the image acquisition unit 22 is also used to acquire the second scan image.

[0082] The sharpnes...

Embodiment 3

[0094] Figure 5 It is a schematic structural diagram of a projector provided in Embodiment 3 of this application, please refer to Figure 5 , the projector 30 includes but is not limited to: a projection lens 31, and a microcontroller 32 capable of controlling the projection lens to scan an image; wherein, the microcontroller 32 is used to control the projector to scan, execute The autofocus method as described in the first embodiment above.

[0095] The projection lens 31 is a lens capable of detecting out-of-focus, shooting / scanning images, and transmitting image information. When detecting out-of-focus, the projection lens 31 acquires an initialization image and transmits the image information to the microcontroller 32, so The projection lens 31 moves to the starting point of the first scan after receiving the instruction sent by the microcontroller 32, then moves to the end point of the first scan and performs the first scan, and sends the image information of the first ...

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Abstract

The embodiment of the present invention provides an autofocus method, device, and projector in the field of projection display; by scanning the image in a small area for the first time and calculating the definition of the scanned image, it is judged according to the definition change characteristics of the scanned image whether it is necessary to perform a second Expand the scanning range for scanning and the scanning direction of the secondary scanning, and quickly and accurately find the position corresponding to the maximum definition. The embodiment of the present invention does not need to scan the whole process, reduces the scanning path and time, quickly completes autofocus, and has better visual effects.

Description

technical field [0001] The invention relates to the field of projection display, in particular to an automatic focusing method, device and projector. Background technique [0002] In the field of projection, due to the different use scenarios, sometimes the projector needs to be moved frequently, so that the projection distance is constantly changing, and the projector often appears out of focus when refocusing; sometimes even if the projector does not move, There will also be out-of-focus situations during use; in order to obtain a clearer projection image, it is generally necessary to adjust the position of the lens accordingly, and compensate the defocus caused by various factors by adjusting the focus. [0003] In the current prior art, an intelligent terminal with a projection function conventionally adopts an automatic focusing method to adjust the projection focal length. One of the methods is that the image is projected on the screen, and the image is captured by th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/53G02B7/38
CPCG02B7/38G03B21/53
Inventor 高志强杨伟樑杨承德李勇林清云
Owner IVIEW DISPLAY SHENZHEN CO LTD
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