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A Correction Method of Focus Preset Position

A technology of preset position and focus adjustment, applied in instruments, installations, optics, etc., can solve problems such as the reduction of focus sharpness, and achieve the solution of preset position offset, accurate focusing position, and elimination of focus preset position offset. Effect

Active Publication Date: 2020-10-16
山东神戎电子股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in practice, lenses often have backlash, i.e. a preset that is in sharp focus when set in one direction is less sharp when called from the other direction

Method used

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  • A Correction Method of Focus Preset Position

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In this embodiment, the correction method of the focus preset position is applied to the lens of the thermal imager, and the position of the lens is collected by a potentiometer, such as figure 1 Shown, the specific steps of this embodiment are:

[0018] S01), set a flag to indicate the direction when setting the preset position, when setting the preset position, there are two directions from near to far (near to far) and from far to near (far to near), use 1 to indicate near to The preset position of far, 0 means the preset position from far to near;

[0019] S02), when calling the preset position, judge whether the preset position to be called is from near to far direction (abbreviated as far direction in the figure), if so, then judge the direction of the current focus position, if the current position is on the near side , that is, the focus position is adjusted from near to far, and the focus direction of the focus position is the same as the direction when settin...

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Abstract

The invention discloses a method for correcting a focus preset position. In the method, a setting flag is set to indicate the direction when the preset position is set, and the direction when the preset position is set is compared with the direction of the focus position, and the return gap is supplemented or Calling the preset position directly can effectively eliminate the focus preset position offset caused by the lens return gap and other reasons, and solve the problem of the preset position offset. Set the threshold and compensation value at the same time to make the focusing position more accurate.

Description

technical field [0001] The invention relates to a method for correcting a focus preset position, which can be used for visible light and thermal imaging lenses and similar products with an electric focus function, and can eliminate the problem of focus preset position offset caused by the return gap of the lens and the like. Background technique [0002] With the further development of security technology, intelligence and unattended features have become one of the trends in the development of monitoring systems. As front-end equipment, monitors play a pivotal role in monitoring systems and need to cooperate with background software to achieve more intelligence. , Automatic functions, the realization of these intelligent functions must first rely on clear images, especially high-definition products have higher requirements for the accuracy of lens focus position. But in practice, lenses often have a backlash, a preset that is in sharp focus when set in one direction, and is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/04
CPCG02B7/04
Inventor 刘明庞博魏磊
Owner 山东神戎电子股份有限公司