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Point spot detection and background noise feature estimation method for point source Hartmann wavefront sensor

A background noise and detector technology, applied in the field of spot spot detection and background noise feature estimation, to achieve the effect of automation

Active Publication Date: 2017-03-22
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to overcome the problem in the prior art that the point source target extraction and background noise feature estimation of point source Hartmann need prior knowledge or human participation

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  • Point spot detection and background noise feature estimation method for point source Hartmann wavefront sensor
  • Point spot detection and background noise feature estimation method for point source Hartmann wavefront sensor
  • Point spot detection and background noise feature estimation method for point source Hartmann wavefront sensor

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Embodiment Construction

[0024] specific implementation plan

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment uses a Hartmann wavefront detector with a microlens array structure, and describes a method for point spot detection and background noise feature estimation for a point source Hartmann wavefront detector. The operation process is as follows figure 1 As shown, the specific steps are as follows:

[0026] 1) In this embodiment, a reference full target image of 240×240 is obtained from the imaging element of the Hartmann wavefront detector, such as figure 2 As shown, in order to highlight the light spot, the grayscale is reversed, that is, the darker the pixel points, the larger the grayscale value, the reference image is an image formed by 10×10 sub-apertures, that is, M=10;

[0027] 2) Based on the principle of the Hartmann wavefront detector, it is necessary to calculate the position of th...

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Abstract

The invention discloses a point spot detection and background noise feature estimation method for a point source Hartmann wavefront sensor. When the method is used for point spot detection and background noise estimation on a certain sub aperture, as for each pixel in the sub aperture, the difference between the gray variance in a neighborhood and the gray variance outside the neighborhood is calculated; the position of the pixel corresponding to the maximum difference in all pixels is then obtained, the neighborhood of the pixel serves as the detected point spot area, and the gray mean value and the gray variance in a non neighborhood of the pixel serve as the mean value and the variance for noise estimation. The method has a simple and stable process, and the realization is easy; compared with the existing background noise estimation method, the method of the invention can estimate the statistical characteristics of the background noise more accurately, the point spot area can be detected at the same time, and thus, the point source Hartmann wavefront detection stability and the precision are further enhanced.

Description

technical field [0001] The present invention relates to a method that can realize point spot detection and background noise feature estimation at the same time, especially a new type that can be used for spot spot area detection and background noise feature estimation in images such as point source Hartmann wavefront sensors—— Methods for mean and variance. Background technique [0002] The Hartmann wavefront detector is one of the important components in the adaptive optics system. It divides the wavefront to be measured into several small areas, and reconstructs the wavefront to be measured by calculating the local average slope in each small area. Because its requirements on the measurement environment are not as strict as those of interferometry, it is widely used in quality control of optical components, beam quality diagnosis, human eye aberration, corneal surface measurement, adaptive optics, etc. The Hartmann detector is composed of a Hartmann sensor and a wavefron...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
CPCG06T7/0002
Inventor 魏凌张浩田王彩霞黄奎杨金生周睿凡木文何益李梅李新阳张雨东
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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