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A non-uniformity correction method for inter-frame registration based on temporal high-pass filtering

A non-uniformity correction and high-pass filtering technology, which is applied in radiation pyrometry, optical radiation measurement, instruments, etc., can solve the problem that the blocky non-uniformity around the image cannot be corrected, and achieve good correction effect and convergence rate Fast, good image quality results

Active Publication Date: 2018-11-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an inter-frame registration non-uniformity correction method based on temporal high-pass filtering, which solves the problem that the block non-uniformity around the image cannot be corrected when the image non-uniformity is strong

Method used

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  • A non-uniformity correction method for inter-frame registration based on temporal high-pass filtering
  • A non-uniformity correction method for inter-frame registration based on temporal high-pass filtering
  • A non-uniformity correction method for inter-frame registration based on temporal high-pass filtering

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Embodiment 1

[0034] combine figure 2 , the infrared focal plane detector collects the infrared image of the mountain at night at high altitude, and the image size is 320×256;

[0035] Step 1. After the original analog image collected by the infrared focal plane detector is A / D converted, the original digital image x is obtained n (i,j);

[0036] Step 2, the original digital image x n (i,j) and gain After multiplication, the low-pass filter is passed to obtain the filtered image f n (i, j), the formula is as follows:

[0037]

[0038] where x n (i, j) is the original output of the nth frame image of the detector (i, j) before non-uniformity correction, M=5.

[0039] Step 3, the high-pass filter corrects the image to obtain the image y after the time-domain high-pass filter n (i,j):

[0040] will be the original digital image x n (i, j) and the filtered f n (i, j) as a difference, the formula is as follows:

[0041] the y n (i,j)=x n (i,j)-f n (i,j)

[0042] Step 4. Corre...

Embodiment 2

[0047] combine image 3 , the infrared focal plane detector collects the infrared image of the overpass shot at night at high altitude, and the image size is 320×256;

[0048] Step 1. After the original analog image collected by the infrared focal plane detector is A / D converted, the original digital image x is obtained n (i,j);

[0049] Step 2, the original digital image x n (i,j) and gain After multiplication, the low-pass filter is passed to obtain the filtered image f n (i, j), the formula is as follows:

[0050]

[0051] where x n (i, j) is the original output of the nth frame of the detector (i, j) before non-uniformity correction, M=6.

[0052] Step 3, the high-pass filter corrects the image to obtain the image y after the time-domain high-pass filter n (i,j):

[0053] will be the original digital image x n (i, j) and the filtered f n (i, j) as a difference, the formula is as follows:

[0054] the y n (i,j)=x n (i,j)-f n (i,j)

[0055] Step 4. Correct...

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Abstract

The invention discloses a nonuniformity correction method of interframe registration based on time-domain high-pass filtering. The method comprises the following steps: carrying out A / D (Analog to Digital) conversion on an original analog image acquired by an infrared focal plane detector to obtain an original digital image, then multiplying the original digital image with a corresponding gain to obtain an image, passing through a low-pass filter to obtain a filtered image, then correcting the image by a high-pass filter, correcting the image which is subjected to the time-domain high-pass filtering through a nonuniformity correction algorithm with minimum inter-frame errors, finally obtaining a corrected image. The nonuniformity correction method of the interframe registration based on the time-domain high-pass filtering disclosed by the invention has the characteristics of simplicity, high efficiency and fast convergence rate, can correct images having massive nonuniformity all around when the nonuniformalty is strong, and has good correction effects for different scenes and wide applicability.

Description

technical field [0001] The technology of the invention belongs to the field of infrared image non-uniformity correction, and in particular relates to an inter-frame registration non-uniformity correction method based on time-domain high-pass filtering. Background technique [0002] Infrared radiation enables human beings to expand their vision of nature. In the infrared imaging system, external infrared radiation passes through the optical system into the infrared focal plane detector and focuses on the thermal sensor. The infrared focal plane detector converts the infrared radiation energy The electrical signal reflects the intensity of infrared radiation energy, and after amplification, AD sampling and signal processing, an observable infrared image is formed on the display system. [0003] Ideally, the response curve of each image-sensitive pixel on an infrared focal plane detector should be exactly the same. However, in actual situations, the semiconductor material and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J5/00
Inventor 隋修宝匡小冬陈钱顾国华钱毅涛赵耀陶远荣刘源潘科辰沈雪薇黄熙燕高航曾俊杰孙镱诚常春梅
Owner NANJING UNIV OF SCI & TECH
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