Wide dynamic range infrared image contrast enhancement method

A wide dynamic range, infrared image technology, applied in the field of image processing, can solve problems such as difficulty, limited contrast enhancement effect of infrared images, unsatisfactory contrast enhancement effect of infrared images, etc., to achieve the effect of increasing contrast and improving observation effect

Active Publication Date: 2019-04-16
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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Problems solved by technology

[0003] Traditional infrared image contrast enhancement methods are not ideal for contrast enhancement of wide dynamic range infrared images with background and high-temperature targets at the same time, such as enhancement processing methods based on infrared image histograms, nonlinear enhancement processing methods based on gamma, The traditional image enhancement processing methods based on space domain and time domain, because these methods do not consider the image information features of the infrared image neighborhood or consider too few image information features of the infrared image neighborhood, and the

Method used

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  • Wide dynamic range infrared image contrast enhancement method
  • Wide dynamic range infrared image contrast enhancement method
  • Wide dynamic range infrared image contrast enhancement method

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Embodiment Construction

[0031] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0032] The infrared system is powered on and running, and a wide dynamic range infrared image with a size of 640×512 pixels is obtained, and three windows with sizes of 17×17, 33×33, and 65×65 are constructed to filter and calculate AA respectively. mask image; according to step 5) three mask image data LP of the original image area corresponding to the filter window 8 (i.j), LP 16 (i.j), LP 32 (i.j), for example, the gray value f(150,140)=3258 of the image pixel at the coordinate point (150,140), the obtained three-layer mask image data are respectively:

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

[0039]

[0040]

[0041]

[0042] Calculate the contrast enhancement result of each image pixel point in the infrared image signal data according to the formula in step 6), for example, the gray value of the image pixel point after

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Abstract

The invention relates to a wide dynamic range infrared image contrast enhancement method. The method comprises the following steps: extracting local information of an infrared image by utilizing a multi-layer image mask, selecting image mask characteristic factors with different sizes for different filtering windows in the calculation of the multi-layer mask image, selecting different filtering degrees for different contrast areas in the image, and finally achieving the effect of adaptively improving the enhancement degree for a low contrast area in the image. According to the method, under the condition of a wide dynamic range, the contrast ratio of the infrared image is effectively improved, and the observation effect of the infrared image can be obviously improved.

Description

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Claims

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Application Information

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Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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