An infrared thermal imager and a real-time automatic blind element detection processing method

A technology of infrared thermal imager and processing method, which is applied in the directions of image data processing, instrumentation, image analysis, etc., can solve the problem of non-continuous or relatively close blind element processing, etc., so as to improve hardware processing speed, reduce calculation amount, and avoid The effect of miscalculation

CN111612773BActive Publication Date: 2021-02-02北京富吉瑞光电科技股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-02-02

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Abstract

The invention relates to an infrared thermal imager and a real-time automatic blind element detection and processing method. For the image of the infrared thermal imager, an adaptive threshold is determined, and the deviation between the central pixel and the average gray value of each pixel in the window is calculated; if the deviation is judged If the absolute value of is greater than the adaptive threshold, it is judged as a suspected blind pixel, and if it is a suspected blind pixel, the position of the suspected blind pixel is marked; after the pixel processing is completed, the marked suspected blind pixel is confirmed twice, and the determined blind pixel is compensated Processing, unmark the excluded blind elements. In the present invention, the suspected blind elements are screened out through rough detection first, and then second confirmation is performed on each suspected blind element according to the characteristics of the blind elements. On the premise of ensuring the accuracy of blind element identification, the amount of calculation is reduced and the hardware is improved. Processing speed ensures real-time processing. In the compensation value of the present invention, the gray value of the blind element is removed, so that the compensation value is more accurate and better image effects are obtained.
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Description

technical field

[0001] The invention relates to the technical field of infrared image processing, in particular to an infrared thermal imager and a real-time automatic blind element detection and processing method. Background technique

[0002] Due to the influence of factors such as inhomogeneity, defect, and process of the semiconductor material used to make the infrared detector, the infrared detector has unstable pixels, failed pixels, and overheated pixels, resulting in a large number of dark spots in the output image of the infrared camera. Dots or bright spots are blind elements, which seriously affect system performance.

[0003] At present, manual blind element detection processing is commonly used, that is, relying on human subjective judgment marks, which is very inefficient. There are also some algorithms for automatic blind element detection, but the recognition rate or real-time performance is not very high.

[0004] The existing blind pixel processing method...

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Embodiment Construction

[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0043] One aspect of the present invention provides a real-time automatic blind element detection processing method, combining figure 1 , including the following steps:

[0044] (1) Obtain the image of the infrared thermal imager and perform time-domain filtering processing.

[0045] (2) Take a (2n+1)x(2n+1) window centered on a certain pixel, and calculate the adaptive threshold.

[0046] In order to obtain a good eff...