Device and method for extracting weak point targets from infrared remote sensing images
A remote sensing image and target extraction technology, applied in image enhancement, image analysis, image data processing and other directions, can solve problems such as target submersion, single-frame image processing cannot achieve reliable target detection, etc.
Active Publication Date: 2016-06-01
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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[0004] At present, the main difficulty in the detection of small targets with low signal-to-noise ratio is: under low signal-to-noise ratio, the target is easily overwhelmed by noise, and single-frame image processing can no longer achieve reliable detection of targets
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[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings, which figure 2 Installation diagram and figure 1 In summary, the implementation of this method can be divided into three steps:
[0035] 1. Sequence infrared image registration
[0036] 1.1 In the embodiment, the infrared weak point target image of 10 frame sequence imaging is used, denoted as n 1 …N 10 .
[0037] 1.2 Registration of adjacent images before and after
[0038] 1.2.1 put n 10 And n 9 The 2 frames of images are divided into 8 rows and 8 columns, and 64 sub-blocks. by Calculate the entropy of each sub-block. Among them, N is the number of image gray levels, p i Indicates the probability that a pixel with gray level i appears in the image. At n 10 And n 9 Respectively select the first 32 sub-blocks with the largest entropy as the regions to be matched;
[0039] 1.2.2 The normalized cross-correlation matching method is adopted, and the calculation method ...
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The invention provided a dim point target extraction method and device of an infrared remote sensing image. The extraction device includes an image registration module, a background clutter suppression module, and a point target extraction module; the image registration module registers a to-be-processed infrared sequence image to get an infrared sequence image after registration; the background clutter suppression module carries out background clutter suppression of the infrared sequence image after registration; and the point target extraction module carries out image data superposition of the infrared sequence image after the background clutter suppression, so as to obtain a point target with an enhanced signal-to-noise ratio. The method of the invention can improve the dim point target signal-to-noise ratio of the infrared remote sensing image and increase the detection probability.
Description
Technical field [0001] The invention belongs to the field of infrared image processing, and relates to an infrared remote sensing image weak point target extraction device and a method thereof. The device is based on image sub-block region matching and registration technology, suppresses the background clutter of infrared image system through time-domain filtering method, and adopts the method of multi-frame superposition to realize the accumulation of signal energy along the target motion trajectory and improve the signal-to-noise ratio of point targets The purpose of extracting point targets. Using this method can improve the signal-to-noise ratio of weak targets in infrared remote sensing images and increase the detection probability. Background technique [0002] In recent years, the detection of low signal-to-noise ratio point targets in images has been a research hotspot in the field of optics and infrared images. The so-called point target refers to a target that occupie...
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IPC IPC(8): G06T7/20G06T5/10G06T5/50
Inventor 邢坤岳春宇何红艳周楠鲍云飞齐文雯李岩李方琦刘爽
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH