A kind of automatic focus method and its system

A technology of auto focus and focus area, applied in the field of auto focus method and its system, can solve problems such as difficult to complete focus, focus performance limitation, etc., achieve precise auto focus and avoid the effect of viewing experience

Inactive Publication Date: 2021-02-19
QISDA OPTRONICS (SUZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the contrast of the subject is low, it is difficult to focus with this method, so the focusing performance of the contrast detection focusing method in low-light environments is greatly limited

Method used

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  • A kind of automatic focus method and its system
  • A kind of automatic focus method and its system
  • A kind of automatic focus method and its system

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Embodiment Construction

[0048] In order to have a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed descriptions are provided in conjunction with the embodiments.

[0049] Certain terms are used in the description and claims to refer to particular elements. Those of ordinary skill in the art will appreciate that manufacturers may refer to the same element by different terms. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. "Include" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to".

[0050] See figure 1 , the application provides an autofocus method, the above method comprising:

[0051] A. Receive a video signal with a first frequency, the video signal at least includes a plurality of first frames.

[0052] The abo...

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PUM

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Abstract

An autofocus method and system thereof provided by the present invention process the received video signal by frequency multiplication so that each first frame picture forms a first sub-frame picture and a second sub-frame picture in unit time, and then Determine the first focus area in a sub-frame picture and project the first focus image, and at the same time project the second focus image correspondingly in the second sub-frame picture, adjust the first focus image and the second focus image so that they are formed with the video signal The picture is equivalent, and then the focus parameters are obtained by continuously adjusting the focus of the first focus image, and the best focal length is obtained to complete the focus. This setting not only ensures that the projection device will not be affected by the external environment when focusing, but also ensures that the focus image inserted during focusing will not be noticed by human eyes, so as to avoid affecting the viewing experience of users and at the same time complete Precise autofocus.

Description

technical field [0001] The invention relates to the field of projection equipment, in particular to an automatic focusing method and system thereof. Background technique [0002] As an image projection and magnification device, the projector is widely used in teaching, training, conferences and other occasions. The projector mainly uses the liquid crystal unit or DMD (Digital Micromirror Device, digital microreflector) microchip according to the input image signal to modulate the illumination light emitted by the light source into the image light for displaying the image, and then through the optical lens system, the image light Enlarged and projected onto the display screen, it is convenient for teaching, training, conferences and other occasions for demonstration purposes. For traditional projectors, users often need to adjust the focal length and focus position of their optical lens system according to their placement, so that the images projected on the display screen c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/31G03B21/53
CPCG03B21/53H04N9/317
Inventor 李德原施柏维
Owner QISDA OPTRONICS (SUZHOU) CO LTD
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