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Automatic focusing method and device

An automatic focus and focus position technology, applied in installation, optics, instruments, etc., can solve the problem of low accuracy of focus position, and achieve the effect of improving accuracy and efficiency and reducing the number of times.

Inactive Publication Date: 2020-04-17
SUZHOU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The present application provides an autofocus method and device, which can solve the problem that the position corresponding to the maximum value of local sharpness is easily determined as the focus position when determining the focus position using the climbing method, resulting in low accuracy in determining the focus position

Method used

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  • Automatic focusing method and device
  • Automatic focusing method and device

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Embodiment Construction

[0048] The specific implementation manners of the present application will be further described in detail below in conjunction with the drawings and embodiments. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0049]Optionally, the present application uses an example in which the execution subject of each embodiment is an electronic device with a lens, and the electronic device can automatically control the focus of the lens, for example: the electronic device is a microscope, and the microscope can be controlled by piezoelectric ceramics The objective lens moves to achieve focus.

[0050] figure 1 It is a flowchart of an autofocus method provided by an embodiment of the present application. The method includes at least the following steps:

[0051] Step 101 , acquiring interval narrowing conditions.

[0052] In one example, the interval narrowing condition is a preset interval length.

[0053...

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Abstract

The invention relates to an automatic focusing method and device, and belongs to the technical field of automatic control, and the method comprises the steps: obtaining an interval reduction condition; gradually reducing the focusing interval in the maximum focusing interval by using a golden section search algorithm so as to search the maximum definition value; when the length of the focusing interval is reduced to meet the interval reduction condition, determining the maximum definition value in the current focusing interval by using a climbing method so as to determine the focusing positionof the lens. The problem that when a climbing method is used for determining the focusing position, the position corresponding to the maximum value of the local definition is easily determined as thefocusing position, and consequently the accuracy of determining the focusing position is not high can be solved. A data distribution curve is obtained for the definition evaluation function; the condition that the local definition maximum value exists at the top of the curve is less, so that the problem that the position of the local definition maximum value is determined as the focusing positioncan be avoided by only determining the definition maximum value at the top of the curve by using the climbing method, and the accuracy of determining the focusing position is improved.

Description

technical field [0001] The present application relates to an automatic focusing method and device, belonging to the technical field of automatic control. Background technique [0002] Traditional auto-focus methods, such as the hill-climbing method, have been widely used in electronic devices equipped with focusing lenses. The climbing method refers to driving the focusing lens in the focusing lens to move in steps along a specific direction with a larger search distance and gradually calculate the resolution of the focusing lens. Before reaching the peak value, the resolution shows an upward trend; when the downward trend occurs, the search direction of the focusing lens is changed, and the search distance is narrowed at the same time to recalculate the modulus transfer function value (module transfer function, MTF value) reflecting the resolution ; Repeat the above steps until the peak value of the MTF value does not change, then the auto-focus function is completed. How...

Claims

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Application Information

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IPC IPC(8): G02B7/36
CPCG02B7/36
Inventor 钟博文胡俊杰孙立宁
Owner SUZHOU UNIV
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