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Method and device for adjusting focal length

A focal length adjustment and focal length technology, which is applied in the field of projection display and can solve the problem that the projection equipment cannot focus automatically.

Active Publication Date: 2017-05-24
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Embodiments of the present invention provide a focus adjustment method and device to solve the problem that projection equipment cannot focus automatically

Method used

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  • Method and device for adjusting focal length
  • Method and device for adjusting focal length
  • Method and device for adjusting focal length

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Embodiment Construction

[0018] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] Such as figure 1 As shown, a flow chart of a focus adjustment method provided by an embodiment of the present invention, the method includes:

[0020] Step 101: The projection device respectively projects the image to be projected according to each focal length in a set of preset focal lengths, obtains the projected image corresponding to each focal length, and determines the third color region in the projected image corresponding to each focal length Area, the third color is any color different from the three primary colors, the image to be projected includes at least two areas, the image color of each area is any one of the three primary colors, and at least two areas The image color is different;

[0021] Step 102: The projection device determines a focal length from the preset set of focal lengths as the projection focal length according t...

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Abstract

The invention relates to the technical field of projection display, and provides a focal length adjusting method and a focal length adjusting device. The method includes that a projection device projects a to-be-projected image according to each focal length in a preset group of focal lengths to acquire a projected image corresponding to each focal length, the area of a region of a third color in the projected image corresponding to each focal length is determined, the third color refers to any color different from three primary colors, the to-be-projected image at least comprises at least two regions, the image color of each region refers to any of the three primary colors, and the image colors of at least two regions are different; the projection device determines a focal length as a projection focal length from the preset group of focal lengths according to the area of the region of the third color in the projected image corresponding to each focal length and projects the image according to the projection focal length.

Description

technical field [0001] The present invention relates to the technical field of projection display, in particular to a focus adjustment method and device. Background technique [0002] Projection equipment is increasingly used in business, conferences, education and entertainment. During the projection process, the projected image can be projected clearly only when the projection focal length and projection distance are in a matching state, otherwise the projected projected image will be blurred. In order to display the projected image clearly, there are generally two methods for adjusting the focal length of the projection device. The first one is to adjust the focal length of the projection equipment according to the distance by measuring the distance between the projection screen and the projection equipment; in this method, the automatic focal length adjustment device adjusts the focal length according to the detected distance, and due to the difference in the micromecha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/31
Inventor 孙学斌李本友
Owner HISENSE VISUAL TECH CO LTD
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