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Automatic focusing system and method for projector

An automatic focus and projector technology, applied in installation, optics, instruments, etc., can solve the problems of reducing projection demonstration efficiency, distortion, cumbersome adjustment process, etc., and achieve the effect of saving focusing time and improving focusing accuracy

Inactive Publication Date: 2009-07-01
SHENZHEN FUTAIHONG PRECISION IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Usually, after turning on the projector, the presenter needs to adjust the focal length and position of the projector to ensure that the projected display screen is normal. For business users who often change the use environment of the projector, these adjustments are relatively cumbersome
[0003] However, existing projectors and other projectors cannot detect the distance between the projector and the projection plane, and automatically adjust the focal length to ensure that the projection display is clear
When the projector is placed at a certain angle from the projection plane, the projected picture will be distorted. In order to ensure the normal display of the picture, the user needs to spend a lot of time adjusting the picture, which reduces the efficiency of projection demonstration

Method used

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  • Automatic focusing system and method for projector
  • Automatic focusing system and method for projector

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Embodiment Construction

[0029] refer to figure 1 Shown is a hardware architecture diagram of a preferred embodiment of the projector auto-focus system of the present invention. The projector auto-focus system 12 runs in a camcorder 1 . The projector 1 includes a control chip 10 , a motor 14 , a memory 16 and a lens 18 . The memory 16 may be a flash memory (FLASH), used for storing pictures to be projected. The control chip 10 controls the motor 14 to expand and contract the lens 18 to adjust the focal length. Described projector autofocus system 12 passes lens 18 on screen projection surface 2 (as Figure 4 Shown) select one or more analysis areas, such as A, B, C, D and 0 analysis areas, set multiple focal lengths within the zoom range of the lens 18, and calculate the above-mentioned analysis by the lens 18 at the endpoints of each focal length within the zoom range The resolution of the area is analyzed and compared to obtain the focal section where the endpoint corresponding to the maximum re...

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Abstract

The invention provides a projector automatic focusing system and a method thereof. The projector automatic focusing system includes an area selector module, a focal length setting module, a resolution calculation module, a contrast module and a control module, wherein the area selector module is used for selecting at least one analysis area on a projection face, the focal length setting module is used for setting a plurality of focal lengths within a focusing range of a lens, the resolution calculation module is used for computing resolution of the lens respectively at the end of each focal length within the focusing range, the contrast module is used for comparing the resolutions obtained by calculation to obtain the focal length of the end corresponding to the maximum resolution, the selector module is further used for selecting a plurality of sites within the obtained focal length, the resolution calculation module is further used for comparing the resolutions at the selected sites of the lens to obtain a site position corresponding to the maximum resolution, and the control module drives the lens to the position of the obtained site through a control motor. With the projector automatic focusing system and the method thereof, the focusing time can be saved and the focusing accuracy can be increased.

Description

technical field [0001] The invention relates to a projector automatic focus system and method. Background technique [0002] Usually, after turning on the projector, the presenter needs to adjust the focal length and position of the projector to ensure that the projected display screen is normal. For business users who often change the environment where the projector is used, these adjustments are relatively cumbersome. [0003] However, projectors such as existing projectors cannot detect the distance between the projector and the projection plane, and automatically adjust the focal length to ensure that the projection display picture is clear. When the projector is placed at a certain angle from the projection plane, the projected picture will be distorted. In order to ensure the normal display of the picture, the user needs to spend a lot of time adjusting the picture, which reduces the efficiency of projection demonstration. Contents of the invention [0004] In view ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B7/28
Inventor 周盟杰
Owner SHENZHEN FUTAIHONG PRECISION IND CO LTD
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