Star high-precision position extraction method based on pixel internal response

An extraction method and pixel technology, applied in the field of space photoelectric remote sensing detection, can solve problems such as errors

Active Publication Date: 2019-03-19
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

The difference in received energy introduces errors into the process of point object location extraction using traditional centroid methods

Method used

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  • Star high-precision position extraction method based on pixel internal response
  • Star high-precision position extraction method based on pixel internal response
  • Star high-precision position extraction method based on pixel internal response

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Step 1: Preprocess the image, remove the background and correct the non-uniformity. Calculate the non-uniformity correction coefficient of each pixel according to the existing blackbody calibration data, which is recorded as K(i, j), where i and j are the horizontal and vertical coordinates of the pixel on the detector. The background is Backgoung(i, j). DN(i, j) is the pixel gray value whose coordinates are (i, j) after processing, and DN’(i, j) is the original pixel gray value.

[0023] DN(i,j)=((DN'(i,j)–Background(i,j))·K(i,j)

[0024] Step 2: After the point target is imaged by the optical system, its energy distribution can be described by Gaussian function. Due to the difference in the response within the pixel, when the target moves on a single pixel, the gray value of the pixel also has a certain change. Find the ten frames with the largest gray valu...

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Abstract

The invention discloses a star high-precision position extraction method based on pixel internal response. According to the response distribution in the pixel, the relationship between the point target position and the pixel gray level is established, and the high-precision position extraction of the star is realized. The steps of position extraction are as follows: 1, removing background and non-uniform correction of the obtained image; 2, according to the pixel filling factor, the energy distribution function of the star after passing through the optical system is obtained by selecting ten frames of images with the largest pixel gray value. 3. According to the energy distribution function and pixel filling factor, the pixel gray values of a series of star objects at different positions are obtained, and the look-up table of star positions and pixel gray values is established by interpolation. 4. Find the corresponding pixel position according to the gray value of pixel. Because of the symmetry of energy distribution and pixel response, we can get several groups of pixel positions. 5. using the centroid method, star positions are selected from the set of pixel positions obtained in step 4.

Description

technical field [0001] The invention belongs to the field of space photoelectric remote sensing detection and extracts the direction of moving star positions. The high-precision position extraction of stars is carried out in combination with pixel filling factors, and has application prospects in the fields of space remote sensing detection and the like. Background technique [0002] When detecting a long-distance target, the target usually appears in the form of a point target on the image plane, and the imaging is smaller than a single pixel. Due to the limitation of the pixel resolution of the focal plane imaging array, the positioning accuracy is a single pixel. In order to improve the positioning accuracy of the target, further calculations are required. [0003] Since the filling factor of the pixel is less than 1, the distribution of the response in the pixel is not uniform, and the energy received by the pixel is different when the target is imaged at different posit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/70G06T7/66
CPCG06T2207/10032G06T7/66G06T7/70
Inventor 陈凡胜孙胜利于清华林长青
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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