Method for correcting line-direction dragging of image observed by lunar-based astronomical telescope

An astronomical telescope, line direction technology, applied in image data processing, graphic image conversion, instruments and other directions, to achieve the effect of easy processing, easy acquisition, and improved photometric accuracy

Inactive Publication Date: 2015-04-29
NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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Problems solved by technology

The observational data of the Hubble Telescope mainly found that there is a tailing phenomenon caused by the column transfer effect in the column direction, but no serious influence is found in the row transfer direction

Method used

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  • Method for correcting line-direction dragging of image observed by lunar-based astronomical telescope
  • Method for correcting line-direction dragging of image observed by lunar-based astronomical telescope
  • Method for correcting line-direction dragging of image observed by lunar-based astronomical telescope

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Embodiment Construction

[0047] The implementation process of the present invention mainly includes: using the dark field observation mode of the moon-based astronomical telescope to collect a group of dark field images, and generating a super dark field image by means of image merging. Then the drag event of the thermal pixel is extracted from the super dark field image, the drag event model of the thermal pixel is statistically analyzed and the model parameters are extracted. According to the extracted model, the dragging phenomenon is corrected column by column for the observed image after the basic processing of background subtraction. Its specific implementation process is as follows image 3 Shown:

[0048] (1) Acquisition of dark field images: According to the conventional requirements of astronomical dark field observations, the dark field is the exposure image when the mirror cover is closed, that is, no external light source is incident. Requirements for dark field exposure time: make the ...

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Abstract

A method for correcting line-direction dragging of an image observed by a lunar-based astronomical telescope comprises the steps of 1, acquiring a dark field image and processing the dark field image to obtain a super dark field image with cosmic ray interference eliminated; 2, extracting line-direction dragging events from the super dark field image; 3, conducting model fitting analysis on all the dragging events extracted in the step 2, so that model parameters are obtained; 4, conducting background subtraction on a primal space observation CCD image, and correcting the image obtained after background subtraction row by row by means of the model parameters obtained in the step 3, so that correction of line-direction dragging of the image observed by the lunar-based astronomical telescope is achieved.

Description

technical field [0001] The invention relates to a method for correcting row direction dragging of observation images of lunar-based astronomical telescopes, which is applied to the correction of the row-direction dragging phenomenon in the observation images of lunar-based astronomical telescopes working on the surface of the moon in my country. At the same time, it can be applied to other space astronomical (and other fields) observations due to the charge transfer effect of the complex space environment (such as cosmic rays, etc.) on the CCD or other reasons to correct the dragging distortion of the observation image in the row direction. Background technique [0002] The terminal equipment of modern astronomical observation, CCD (Charge Coupled Device: charge coupled device image sensor) camera, with its high response efficiency and stable instrument characteristics, has a wide range of applications in both ground astronomical observation and space astronomical observation...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/00
CPCG06T3/00
Inventor 吴潮邓劲松曹莉裘予雷魏建彦
Owner NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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