A high-precision star position extraction method based on intra-pixel 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: 2021-08-06
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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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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  • A high-precision star position extraction method based on intra-pixel response
  • A high-precision star position extraction method based on intra-pixel response
  • A high-precision star position extraction method based on intra-pixel 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 val...

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Abstract

The invention discloses a high-precision star position extraction method based on the response within the pixel. According to the response distribution within the pixel, the relationship between the point target position and the gray level of the pixel is established to realize the high-precision position extraction of the star. The position extraction steps are: 1. Perform background removal and non-uniformity correction on the obtained image. 2. Select ten frames of images with the largest pixel gray value, and calculate the energy distribution function of the star target after passing through the optical system according to the filling factor of the pixel. 3. According to the energy distribution function and pixel filling factor, a series of pixel gray values ​​of star targets at different positions are obtained, and a lookup table of star positions and pixel gray values ​​is established by interpolation. 4. Find the corresponding pixel position according to the gray value of the pixel, and obtain several groups of pixel positions due to the symmetry of the energy distribution and the pixel response. 5. Use the centroid method to select star positions from several groups 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 Patents(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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