A Non-uniformity Correction Method for Inter-Frame Registration Based on Subspace Projection

A technology of non-uniformity correction and subspace projection, which is applied in image enhancement, instrumentation, computing, etc., can solve problems such as not being able to obtain good image quality, and achieve good correction effect, fast convergence rate, and good image quality

Inactive Publication Date: 2019-04-12
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 a non-uniformity correction method for inter-frame registration of subspace projection, which solves the problem that good image quality cannot be obtained when the image is faced with severe noise

Method used

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  • A Non-uniformity Correction Method for Inter-Frame Registration Based on Subspace Projection
  • A Non-uniformity Correction Method for Inter-Frame Registration Based on Subspace Projection
  • A Non-uniformity Correction Method for Inter-Frame Registration Based on Subspace Projection

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Experimental program
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Embodiment 1

[0065] combine figure 2 , the infrared detector collects the infrared image of the campus buildings taken at high altitude during the day, and the image size is 320×256.

[0066] A non-uniform correction method for inter-frame registration of subspace projection, the method steps are as follows:

[0067] Step 1. After the original analog image collected by the infrared detector is A / D converted, the original digital image X is obtained m , X∈R M×N , where M represents the original digital image X m The number of rows, N represents the original digital image X m The number of columns, m represents the frame number of the original digital image.

[0068] Step 2. For the original digital image X m Each row is preprocessed with a row mean of zero to obtain an image X r , the formula is as follows:

[0069]

[0070]

[0071]

[0072]

[0073] where x i ∈ R 1×N represents the i-th row of the original digital image, Denotes the average row value of all rows of...

Embodiment 2

[0093] combine image 3 , the infrared detector collected the infrared image of the plateau taken at high altitude during the day, and the image size is 320×256.

[0094] A non-uniform correction method for inter-frame registration of subspace projection, the method steps are as follows:

[0095] Step 1. After the original analog image collected by the infrared detector is A / D converted, the original digital image X is obtained m , X∈R M×N , where M represents the original digital image X m The number of rows, N represents the original digital image X m The number of columns, m represents the frame number of the original digital image.

[0096] Step 2. For the original digital image X m Each row is preprocessed with a row mean of zero to obtain an image X r , the formula is as follows:

[0097]

[0098]

[0099]

[0100]

[0101] where x i ∈ R 1×N represents the i-th row of the original digital image, Denotes the average row value of all rows of the orig...

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Abstract

The invention discloses an inter-frame registration non-uniformity correction method based on subspace projection. An original digital image is obtained after the original analog image acquired by an infrared detector is subjected to A / D conversion. Then, rows and columns are subjected to preprocessing in which row mean values and column mean values are enabled to be zero. A row matrix and a column matrix are projected onto the respective subspaces. Row displacement and column displacement of two adjacent frames are obtained in respective subspaces. Finally, the obtained row (column) displacement is substituted into an inter-frame registration formula to achieve non-uniformity correction in order to obtain a corrected image. The inter-frame registration non-uniformity correction method is simple and high in efficiency, can process the non-uniformity image with a large amount of noise and obtains a better correction effect.

Description

technical field [0001] The technology of the invention belongs to the field of infrared image non-uniformity correction, and in particular relates to a method for correcting non-uniformity of frame-to-frame registration of subspace projection. Background technique [0002] Infrared radiation enables human beings to expand their vision of nature. In the infrared imaging system, external infrared radiation is transmitted to the infrared detector through the optical system and focused on the thermal sensor. The detector converts the infrared radiation energy into an electrical signal. The 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 process defects of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 隋修宝匡小冬陈钱顾国华沈雪薇赵耀陶远荣刘源潘科辰
Owner NANJING UNIV OF SCI & TECH
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