A Noise Filtering Method for High Energy Particle Trajectories of Spaceborne Lightning Imager
A high-energy particle and noise filtering technology, applied in the field of image processing, can solve problems such as high-energy particle trajectory noise filtering errors, and achieve the effect of ensuring recognition accuracy
Active Publication Date: 2019-09-06
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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[0004] The technical problem of the present invention is: to overcome the deficiencies of the prior art, and to provide a method for filtering high-energy particle trajectory noise of a spaceborne lightning imager, which can solve the problem of high-energy particle trajectory caused when the continuity or density of lightning events is poor The problem of large error in noise filtering
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[0034] The specific embodiment of the present invention can be as follows figure 1 , as shown in the following steps:
[0035] (1) Obtain the main characteristic parameters of high-energy particle trajectory noise. The number of samples of high-energy particle trajectory noise is N (N>10000), and the following parameters are calculated for each sample s (s=1,2,…,N):
[0036] 1) The number of lightning events Count represents the total number of lightning events contained in each sample:
[0037] Count=sum(event i )
[0038] where event i Indicates the lightning event i contained in the sample;
[0039] 2) Sort the events on the trajectory segment, by row or by column, monotonically increasing or monotonically decreasing;
[0040] 3) The two lightning events at the beginning and end of the trajectory segment are event 1 and event n , the distance Length between two points:
[0041] Length=sqrt[(x 1 -x n ) 2 +(y 1 -y n ) 2 ]
[0042] where (x i ,y i ) is the po...
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The invention, which repeats to the field of the image processing technology, provides a high-energy particle trajectory noise filtering method for a spaceborne lightning imager. The method comprises:(1), obtaining a sample feature parameter corresponding to each high-energy particle trajectory noise sample; (2), according to the location of each lightning event obtained in real time in an imagecoordinate system, acquiring a projection curve of each lightning event in a polar coordinate system, and generating a spatial accumulation matrix based on the projection curve of each lightning eventin the polar coordinate system; (3), acquiring a feature parameter of a trajectory formed by the lightning event corresponding to a maximum element value from a spatial accumulation matrix; (4), detecting whether the trajectory formed by the lightning event corresponding to the maximum element value is a high-energy particle trajectory noise; and (5), if so, carrying out deletion processing.
Description
technical field [0001] The invention belongs to the technical field of image processing, and relates to a method for filtering high-energy particle trajectory noise of a spaceborne lightning imager. Background technique [0002] Space-based lightning detection is an important means for long-term and large-scale continuous lightning detection. Spaceborne lightning imagers are affected by harsh electromagnetic environments such as ultraviolet rays and solar wind when they are in orbit. Relative motion within adjacent frames forms a linearly distributed trajectory, which is called high-energy particle trajectory noise. [0003] At present, the noise filtering method for high-energy particle trajectories is as follows: firstly, according to the principle of spatial clustering of lightning events, lightning events are clustered into lightning groups, and then the shape of each group is identified. If the lightning events contained in the current group are distributed on the same ...
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IPC IPC(8): G01V8/10G06T7/60
Inventor 高慧婷鲍书龙刘薇曹世翔齐文雯谭伟何红艳鲍云飞王殿中梁华
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH