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Calibration-based non-uniformity correction device and method without baffle

A technology of non-uniformity correction and blocking, which is applied in the field of infrared image processing, and can solve problems such as increased power consumption, image quality deterioration, and large noise

Active Publication Date: 2019-04-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To sum up, the existing non-uniformity correction has the following problems: (1) The image quality is easily deteriorated due to temperature changes; (2) Blind vision, poor system stability, large noise, and increased power consumption are caused by the use of baffles. question

Method used

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  • Calibration-based non-uniformity correction device and method without baffle
  • Calibration-based non-uniformity correction device and method without baffle
  • Calibration-based non-uniformity correction device and method without baffle

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Embodiment 1

[0098] The detector model is GWIR 02 02 X1A, the resolution is 384×288, and the input image with AD bit width is 14. The ambient temperature of the lid image calibration is -20℃~50℃, and 1 frame is marked every 5℃, and the blackbody temperature For -20°C and 50°C, the original output image of the detector is input into the non-uniformity correction module without baffle to process the image. combine figure 2 ,in figure 2 (a) The detector faces the uniformity and the background, and outputs a non-uniform image including the pot lid. There are a large number of vertical stripes in the picture, and a black pot lid appears in the central area. figure 2 (b) represents that after being processed by the present invention, the detector faces a uniform background, and the image is relatively uniform without vertical stripes and pot lids, figure 2 (c) shows the image of the outdoor scene after being processed by the present invention, the details are clearly discernible, and the q...

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Abstract

The invention discloses a non-uniformity correction device and method based on calibration and without baffles. The calibration module stores the images of pot lids with different detector shell temperatures in the FLASH. When the system is working, the parameter calling module transfers the images of the pot lids in the FLASH and the non-uniformity correction parameter K into the SDRAM, and the SDRAM reading module reads out the non-uniformity correction parameters K. Uniformity correction parameter K, and at the same time read two frames of pot lid images containing T in SDRAM according to the real-time input detector shell temperature T; the linear interpolation module linearly interpolates the corresponding temperature T according to the detector shell temperature T and the pot lid image The real-time pot lid image is input to the non-uniformity correction module, and the non-uniformity correction module performs non-uniformity correction on the cached image data and outputs it. The invention widens the operating temperature range of the system, reduces the influence of temperature changes on image quality, and has strong system stability, low noise and low power consumption.

Description

technical field [0001] The invention belongs to the technical field of infrared image processing, in particular to a calibration-based non-uniformity correction device and a method thereof. Background technique [0002] The original infrared images generally have the characteristics of large non-uniformity, low contrast, and poor resolution, which greatly reduces the imaging quality of infrared imaging systems in practical applications. Non-uniformity refers to that when the focal plane array is irradiated with uniform light intensity outside, the output of each unit is inconsistent, which is manifested as spatial noise or fixed pattern noise on the image. The infrared image non-uniformity correction based on two points is a correction algorithm based on calibration, and the two-point correction method is one of the earliest researched and most mature algorithms. There are two prerequisites for applying the two-point method correction. First, the response of the detector is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J5/00
CPCG01J5/00G01J5/80
Inventor 隋修宝黄熙燕宋祥伟刘程威刘源陈钱顾国华于雪莲钱惟贤何伟基
Owner NANJING UNIV OF SCI & TECH
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