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A method for enhancing the clarity of infrared thermal images

A technology of image clarity and infrared heat, applied in image enhancement, image data processing, instruments, etc., can solve the problems of expensive thermal imager, difficult to apply in a large range, etc., to improve local clarity, good clarity, reduce The effect of dimension

Inactive Publication Date: 2017-08-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, higher-resolution thermal cameras are expensive and difficult to apply on a large scale at this stage

Method used

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  • A method for enhancing the clarity of infrared thermal images
  • A method for enhancing the clarity of infrared thermal images
  • A method for enhancing the clarity of infrared thermal images

Examples

Experimental program
Comparison scheme
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Embodiment

[0046] Such as figure 1 As shown, a method for enhancing the clarity of an infrared thermal image comprises the following steps:

[0047] A collects infrared thermal images, and performs enhanced contrast preprocessing; the infrared thermal images are obtained through two infrared thermal imaging cameras with parallel optical axis structures and different focal lengths, and the infrared thermal images include short-focus images and telephoto images ;Specifically:

[0048] A1 uses the median filter algorithm or bilateral filter algorithm to smooth and denoise the image, and the median filter is calculated as follows:

[0049] x o =Mid{X i},i∈Z

[0050] where Z is the window range of the median filter, X i is the pixel value in the window, X o Is the output of the median filter, and Mid means to find the middle value.

[0051] The calculation of bilateral filtering is as follows:

[0052] The weight coefficient is calculated by superimposing the filter coefficient determ...

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Abstract

The invention discloses a method for enhancing the definition of an infrared thermal image, which comprises the following steps: A. collects the infrared thermal image, and performs contrast enhancement preprocessing; the infrared thermal image is obtained through two parallel optical axis structures and has different focal lengths The infrared thermal image includes a short-focus image and a long-focus image; B expands the short-focus image and divides the long-focus image into low-frequency and high-frequency images; C uses the DLT algorithm and translation mapping table to establish the enlarged short-focus image The mapping relationship aligned with the infinity plane of the original telephoto image; D establishes an image pyramid and calculates the horizontal disparity between images; E fuses the high-frequency part of the telephoto image into the enlarged short-focus image and partially fuses it into the enlarged short-focus image in focus image. Compared with the high-resolution infrared thermal imager, the present invention reduces the cost; ensures a large viewing angle range and increases the definition of a local area.

Description

technical field [0001] The invention relates to the field of infrared image processing, in particular to a method for enhancing the definition of an infrared thermal image. Background technique [0002] In view of the characteristics of infrared thermal images with low grayscale range, dark overall image, blurred edges, and aliasing of various noises, the preprocessing of infrared thermal images is very important. The main tasks include reducing noise, increasing grayscale range, and enhancing edges, etc. Task. Due to the sensor characteristics of the infrared thermal imager, its imaging resolution is low, and the resolution of ordinary commercial thermal imagers will not exceed 640*480. However, higher-resolution thermal imaging cameras are expensive and difficult to apply on a large scale at this stage. Therefore, it can be considered to use low-resolution images for fusion to obtain better clarity at a lower price. [0003] Usually an infrared image is composed of fore...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/50
Inventor 杜娟冯颖胡池胡跃明
Owner SOUTH CHINA UNIV OF TECH
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