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Focusing method and focusing device for projection equipment

A projection device and focusing technology, applied in the field of projector focusing, can solve the problems of long focusing time and occupying large computing resources, and achieve the effect of compensating for inaccurate focusing

Inactive Publication Date: 2021-06-04
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the object of the present invention is to provide a focusing method and a focusing device for projection equipment. The present invention adopts the ranging method to do a rough focusing, avoiding the back and forth of the definition contrast method. Traversal and repeated comparison of sharpness lead to large computing resources and long focusing time; then the sharpness comparison method is used to optimize the focusing result of the ranging method, ensuring the accuracy and stability of the focusing effect

Method used

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  • Focusing method and focusing device for projection equipment
  • Focusing method and focusing device for projection equipment

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Embodiment 1

[0047] Such as figure 1 As shown, a focusing method for a projection device provided by an embodiment of the present invention includes:

[0048] S11. Obtain the mapping relationship K=F(D) between the projection distance D of the projection device and the motor movement steps K when the corresponding projection picture is clear;

[0049] S12. Obtain the current motor position K1, and obtain the projection distance D1 corresponding to the current motor position according to the mapping relationship K=f(D) between the projection distance and the motor position;

[0050] S13. Obtain the current projection distance D2, and obtain the motor position K2 corresponding to the current projection distance according to the mapping relationship K=f(D) between the projection distance and the motor position;

[0051] S14. Determine whether D1 is smaller than D2, if yes, set the focusing direction as the first moving direction, otherwise set the focusing direction as the second moving dire...

Embodiment 2

[0078] Such as Figure 4 As shown, a focusing device for a projection device provided by an embodiment of the present invention includes: a motor drive module 23, a distance sensor device 24, a camera device 25, a memory module 21, and a software processing module 22, wherein:

[0079] The memory module 21 is used to store the sharpness requirement value M, the number of reverse compensation steps A, record the motor position, record the focusing direction and record the image sharpness;

[0080] 22 software processing modules are used to calculate the projection distance D1 and the target motor position K2 at the previous moment, determine the focus direction, send the drive motor command, obtain image clarity and contrast clarity;

[0081] The motor driving module 23 is used to drive the motor to move according to the focusing information sent by the software processing module, and the focusing information includes the focusing direction and the number of moving steps;

[0...

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Abstract

The invention discloses a focusing method for projection equipment. The focusing method comprises the following steps: acquiring a mapping relation K=F(D) between a projection distance D of the projection equipment and a motor moving step number K; acquiring a current motor position K1, and acquiring a projection distance D1 at the previous moment according to K=F(D); obtaining a current projection distance D2, and obtaining a target motor position K2 according to K=F(D), whether D1 is smaller than D2 is judged, if yes, the focusing direction is set to be the first moving direction, and if not, the focusing direction is set to be the second moving direction; and judging whether the focusing direction is opposite to the last focusing direction or not, if yes, driving the motor to move by the step number of |K1-K2|+A, otherwise, driving the motor to move by the step number of |K1-K2|, performing optimized focusing through a definition comparison method, and driving the motor to traverse very few positions to enable a projected image to reach a definition required value. The invention further discloses a focusing device for the projection equipment. According to the invention, the accuracy and stability of the focusing effect are ensured.

Description

technical field [0001] The invention relates to the technical field of projector focusing, in particular to a focusing method and a focusing device for projection equipment. Background technique [0002] The automatic focus function of projection products on the market is insufficient no matter whether it adopts the automatic focus of the image detection method or the automatic focus of the distance measurement method. The automatic focusing method based on the image detection method uses image clarity as the criterion for judging whether the image is clear. When focusing, it is necessary to continuously compare and analyze the clarity of the focusing image. The focusing process is slow, takes a long time, and takes up CPU calculations. Great resources. The active method based on the distance measurement method usually obtains the projection distance of the projection device through a distance sensor, and uses the distance information to calculate the position of the focus ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/14G02B7/04
CPCG03B21/142G02B7/04
Inventor 杨沙沙
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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