Parallel realization method for reconstructing spot diagram in astronomic image by K-T algorithm

Abstract

The invention relates to a parallel realization method for high-resolution reconstruction of a spot diagram in an astronomic image by a K-T algorithm, and belongs to the field of astronomic technical image processing and computing. The method comprises the steps of firstly reading image and parameter files through a main process of a CPU and calculating related physical parameters for performing image preprocessing and data alignment; secondly segmenting a whole view field image of all frames into numerous sub-blocks according to the size of an isoplanatic region to perform image block segmentation; thirdly distributing sub-block frames to independent sub-processes, performing parallel computing processing by adopting a CUDA parallel programming model, and performing Fourier amplitude and phase reconstruction; and finally performing inverse Fourier transform on each sub-block in combination with Fourier amplitude and phase by each sub-process to obtain a reconstructed image, and performing splicing processing on all the sub-blocks by the main process to finish reconstruction. According to the method, a CPU+GPU mixed heterogeneous parallel mode and a GPU-aware MPI mechanism are applied to the problem in the high-resolution reconstruction of the spot diagram in the astronomic image, so that the problem in the high-resolution reconstruction of the spot diagram is solved; and the method has relatively high expansibility.

Description

technical field [0001] The invention relates to a method for realizing parallelization of speckle images in high-resolution reconstructed astronomical images by K-T algorithm, which belongs to the fields of astronomical technology, image processing and distributed parallel computing. Background technique [0002] The pioneering contribution to high-resolution frequency-domain reconstruction of astronomical images was made by Labeyrie. The Labeyrie method is also often called speckle interferometry (speckle interferometry). Prior to this, people have realized that the long-exposure images of astronomical images lose almost all high-frequency information, and the short-exposure images are also fragmented and deformed due to wavefront distortion. After carefully studying the speckle structure of short-exposure images, Rabelli pointed out that short-exposure astronomical images contain high-frequency information that can be used. [0003] When the light emitted by astronomical ...

AI Technical Summary

Problems solved by technology

If the exposure time is prolonged, the atmosphere will not be able to maintain a constant phase fluctuation, which will cause the initial phase of each frequency fringe to change randomly, and eventually lose high-frequency information

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