Infrared thermal image resolution enhancing method

A technology of image clarity and infrared heat, applied in image enhancement, image data processing, instruments, etc., can solve the problems of difficult and large-scale application, expensive thermal imager, etc., to improve local clarity, reduce dimensions, and improve search effect of speed

Inactive Publication Date: 2014-12-10
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, higher-resolution thermal cameras are expensiv

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  • Infrared thermal image resolution enhancing method
  • Infrared thermal image resolution enhancing method
  • Infrared thermal image resolution enhancing method

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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 an infrared thermal image resolution enhancing method, which comprises the following steps of: A, acquiring infrared thermal images and performing enhancing contrast ratio pre-treatment, wherein the infrared thermal image is obtained through two infrared thermal image instruments which are parallel with an optical axis structures and have different focal distances, and the infrared thermal images comprise short-focus images and long-focus images; B, enlarging the short-focus images, and dividing the long-focus images into low-frequency images and high-frequency images; C, establishing a mapping relationship of planes at infinity of the enlarged short-focus images and the original long-focus images by utilizing an DLT algorithm and a translation mapping table; D, establishing an image pyramid, and calculating an optical parallax among the images in the horizontal direction; E, partially fusing the high-frequency images of the long-focus image into the enlarged short-focus images, and partially fusing the high-frequency images into the enlarged short-focus images. In comparison with a high-resolution infrared thermal image instrument, the cost is reduced, a relatively big visual angle range is guaranteed, and the resolution of a local region is increased at the same time.

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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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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