Method for removing cosmic rays in charge-coupled device (CCD) astronomic image

Abstract

The invention discloses a method for removing cosmic rays in a charge-coupled device (CCD) astronomic image. The method comprises the following steps of: (1) performing sub-sampling on an original image I to obtain a sub-sampled image; (2) improving a Laplacian operator, amplifying the sub-sampled image, performing convolution operation on the amplified sub-sampled image and the improved Laplacian operator, removing a negative value, and recovering an original size to obtain a Laplacian image L'; (3) identifying cosmic rays in the Laplacian image L'; (4) removing the cosmic rays in the Laplacian image L'; and (5) performing image edge enhancement processing on the image in which the cosmic rays are removed by utilizing a fractional differential normalized Tiansi operator. According to the method, the identification rate of the cosmic rays is greatly increased, a part influenced by the cosmic rays in a star can be maximally retained, and the processing quality of the image is improved.

Description

technical field [0001] The invention relates to a CCD astronomical image, in particular to a method for eliminating cosmic rays in the CCD astronomical image. Background technique [0002] CCD (Charge-Coupled Device, Charge-Coupled Device) astronomical images will be affected by various noises during the acquisition process, and the high-energy cosmic ray noise seriously affects the quality of CCD astronomical images. Cosmic rays refer to a stream of charged particles with considerable energy from the universe, mainly composed of bare atomic nuclei such as protons, helium nuclei, and iron nuclei. Since the distribution of cosmic rays is irregular and random, it is possible Being located in the star image of the star to be measured will lead to deviations in the position and brightness of the star image, resulting in the inability to clearly and correctly identify stars in the universe. Therefore, effective identification and elimination of cosmic ray noise is very important ...

AI Technical Summary

Problems solved by technology

But it is not enough to use this algorithm alone, because the simple Laplacian operator will detect discontinuous edges; when detecting cosmic rays, it is only replaced by a simple median filter, which will cause a certain lack of information in the original image, which is useful for astrology Information will be attenuated

With the development and progress of imaging technology, the resolution of acquired CCD astronomical images is getting higher and higher, so the algorithm requirements for eliminating cosmic rays are also getting higher and higher. For its batch processing of large CCD astronomical images, single CPU Serial implementation efficiency is relatively low

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