Automatic focusing method for astronomical telescope

An astronomical telescope and auto-focusing technology, which is applied to telescopes, parts of color TVs, parts of TV systems, etc., can solve the problems of high application environment requirements, high implementation costs, lack of versatility, etc. easy-to-achieve effects

Inactive Publication Date: 2010-08-25
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

At present, the automatic focusing technology applied at home and abroad mostly uses linear array CCD or other hardware to detect and realize, the implementation cost is high, the application environment requirements are high, and it is not universal

Method used

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  • Automatic focusing method for astronomical telescope
  • Automatic focusing method for astronomical telescope
  • Automatic focusing method for astronomical telescope

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Embodiment

[0045] Taking a certain type of photoelectric telescope with a caliber of 100mm to observe stars as an example, the CCD camera is DV887 from Andor Company in Canada, the number of pixels is 512×512, the output gray scale is 16 bits, the image sampling time is 20ms, and the interface of the acquisition card is PCI bus, DC Focus motor output.

[0046] The specific implementation process: according to the workflow in Figure 1, collect images, and preprocess the images, and calculate the evaluation function; judge the search direction according to the image evaluation function values ​​of 5 consecutive points to determine the positive and negative rotation of the motor (see Fig. 2), when the maximum value of the evaluation function appears, it indicates that the focusing is completed. In this embodiment, the focusing verification of a certain star is carried out, and the focusing effect is shown in FIG. 3 .

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Abstract

The invention relates to an automatic focusing method for an astronomical telescope and belongs to the technical field of spatial object detection of the astronomical telescope. The method comprises the following steps: acquiring a corresponding unimodal and monotonic image gray gradient evaluation function on a time domain according to energy distribution, which is accordant with a target image, of the frequency-domain characteristic of a point spread function for an optical system of the astronomical telescope and the Rayleigh energy conservation law; performing low-pass filtering on the evaluation function to obtain an ideal target energy concentration ratio evaluation function; and continuously adjusting the step length and the direction of a driving motor and searching a global maximum of the evaluation function to complete an entire automatic focusing process by using an optimized hill-climbing method. The method has the advantages of simpleness, easy realization and generality.

Description

technical field [0001] The invention belongs to the technical field of astronomical telescope space target detection, in particular to an astronomical telescope automatic focusing method. Background technique [0002] Image auto-focus technology has an important application prospect in astronomical observation. During the use of astronomical telescopes, due to temperature differences and distances between targets, the imaging of the target on the detector target surface will appear out of focus. Clarity of target observation. At present, most of the automatic focusing technologies used at home and abroad are detected by linear array CCD or other hardware, which has high implementation cost, high application environment requirements, and no versatility. Contents of the invention [0003] The purpose of the present invention is to provide an astronomical telescope automatic focusing method, which has simple structure and universality. [0004] In order to achieve the above...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B23/00H04N5/232
Inventor 赵金宇王斌贾建禄郭爽杨轻云吴元昊曹景太
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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