Linear filter and non-linear filter combined heterogeneity correction method

A nonlinear filter and non-uniformity correction technology, which is applied in instrumentation, image enhancement, computing, etc., can solve problems such as slow convergence speed and poor smoothing effect of nonlinear smoothing filter

Inactive Publication Date: 2013-03-13
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

This method has the advantages of obvious smoothing effect and fast convergence speed of the linear smoothing filter, and the edge-preserving characteristics of the nonlinear smoothing filter. , the disadvantage of slow convergence

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  • Linear filter and non-linear filter combined heterogeneity correction method
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  • Linear filter and non-linear filter combined heterogeneity correction method

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[0056] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0057] Such as figure 1 As shown, the non-uniformity correction method combining linear and nonlinear filters of the present invention includes:

[0058] Step 101: Receive the infrared focal plane output image sequence frame by frame, and perform linear correction on the current image of each frame according to the current gain and offset correction parameter values ​​of each pixel position in the image to obtain the corrected image. The correction formula is as follows:

[0059] the y ij (n)=g ij (n)x ij (n)+o ij (n)

[0060] where y ij (n) is the corrected image, x ij (n) is the focal pla...

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Abstract

The invention discloses a linear filter and non-linear filter combined heterogeneity correction method. When a linear correction image undergoes spatial smoothing filtering to obtain an estimated image of a real scene, if the heterogeneity level is high, a mean filter with a template of 11*11 is used, or else a non-linear smoothing filter with a template of 5*5 is used, the self-adaption iteration step length of correction parameters is calculated while the filter at the edge is retained, detection and replacement of abnormal pixels (damaged elements and impulse noises) are performed, a filtering output image serves as the estimated image of the real scene, change detection is achieved by utilizing a change reference image, and iteration update is performed on a heterogeneity correction coefficient only when the difference between the correction image and the change reference image is larger than a change threshold. The linear filter and non-linear filter combined heterogeneity correction method has the advantages of large smoothing effect and quick convergence speed of a linear smoothing filter, has the edge-preservation characteristics of the non-linear smoothing filter, and is low in computing complexity and suitable for hardware circuit achievement.

Description

technical field [0001] The invention belongs to the field of image detection and processing, and more specifically relates to a non-uniformity correction method combining linear and nonlinear filters. Background technique [0002] Due to differences in the manufacturing process, there are differences in the spectral response characteristics of each detector element in an uncooled infrared focal plane array (Focal Plane Array, FPA) detector, which is called non-uniformity. Non-uniformity is manifested as Fixed Pattern Noise (FPN for short) superimposed on the scene in the output image of the detector. This noise seriously affects image quality and is not conducive to applications such as target detection and recognition. It needs to be suppressed or even eliminated through correction. Since non-uniformity drifts with time and environmental conditions, it is not sufficient to perform a blackbody-based calibration just prior to use. However, periodic blackbody-based calibrati...

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Application Information

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IPC IPC(8): G06T5/50
Inventor 桑红石梁巢兵高伟张静王文李利荣赵慧谢连波
Owner HUAZHONG UNIV OF SCI & TECH
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