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Method for restraining sea surface bright band on basis of wavelet transform

A wavelet transform, bright band technology, applied in the field of image processing, can solve the problems of unseen, complex infrared radiation characteristics on the sea surface, unfavorable target detection and identification, etc., to achieve the effect of suppressing interference

Inactive Publication Date: 2015-05-27
BEIJING INST OF ENVIRONMENTAL FEATURES
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Problems solved by technology

Since the background of the sea surface and its features (such as wave peaks) are moving and changing, and the reflection of the sky and the sun is also changing, the infrared radiation characteristics of the sea surface are more complicated.
In the background of the sea and the sky, because the sea reflects the sun, a bright band on the sea surface will be formed. When the bright band is strong, the gray intensity of a large number of wave crests in the infrared image is close to or even equal to or greater than the maximum gray value of the target pixel. Very bad for detection and identification
At present, domestic and foreign research on sea surface bright bands mainly focuses on analyzing the causes of sea surface bright bands, and selecting detection angles to avoid the influence of sea surface bright bands on target detection, but there is no report on eliminating the influence of sea surface bright bands through research algorithms

Method used

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Embodiment Construction

[0014] A method for suppressing sea surface bright bands based on wavelet transform, comprising the following steps:

[0015] Step 1: Read the image

[0016] Use the infrared imaging system to obtain images of bright bands on the sea surface at different detection angles, and read the image data through the matlab program;

[0017] Step Two: Decompose

[0018] Decompose the read image into high frequency component h(0) and low frequency component g(0).

[0019] Step 3: Loop

[0020] Take the low frequency component of the previous cycle, use g(n)=(-1) n .h(1-n) calculates the corresponding high frequency component,

[0021] Decompose the highest frequency component, and also decompose it into low frequency component and high frequency component, and then use the low frequency component to calculate the corresponding high frequency component, and cycle 3 to 10 times.

[0022] Generally speaking, it is enough to loop 3 times. If the accuracy of the data is required, it can ...

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Abstract

The invention belongs to an image processing method and particularly relates to a method for restraining sea surface bright band on the basis of wavelet transform. The method comprises the following steps: step1: reading images, using an infrared imaging system to obtain sea surface bright band images from different detecting angles, and reading image date through a matlab procedure; step 2: decomposing, carrying out decomposing on the images read, and decomposing into high frequency components h (0) and low frequency components g (0); step 3: circulating, taking a low frequency component in last circulation, calculating corresponding high frequency components by using a formula that g(n) equals to (-1)n.h(1-n), carrying out component decomposing to a highest frequency component, decomposing into a low frequency component and a high frequency component, then calculating corresponding high frequency component by using the low frequency component, and circulating for 3 to 10 times. After the use of the image processing method, the following effects are achieved: according to the method, the cause of formation of the sea surface bright band is considered, low frequency outline information and high frequency detail information of the sea surface bright band can be obtained through wavelet transform, that the wavelet transform can effectively restrain interferences from the sea surface bright band to target detection can be seen from corresponding high frequency detail information, and the method has significance on characteristic research of sea-sky background.

Description

technical field [0001] The invention belongs to image processing methods, in particular to a method for suppressing sea surface bright bands based on wavelet transform. Background technique [0002] The infrared radiation of the sea surface is mainly composed of the thermal radiation of the sea surface itself and its scattering of ambient radiation (such as the infrared radiation of the sun and the sky). Since the background of the sea surface and its features (such as wave peaks) are moving and changing, and the reflection of the sky and the sun is also changing, the infrared radiation characteristics of the sea surface are more complicated. In the background of the sea and the sky, because the sea reflects the sun, a bright band on the sea surface will be formed. When the bright band is strong, the gray intensity of a large number of wave crests in the infrared image is close to or even equal to or greater than the maximum gray value of the target pixel. Detection and ide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/10
Inventor 陈伟力王淑华王广平陈艳李军伟
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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