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 information of the background and the target cannot be taken into account, which will inevitably lead to infrared Image contrast enhancement is very limited
The new infrared image contrast enhancement method, such as the infrared image enhancement method based on the retinex theory, can have a better analysis and consideration of the image information in the infrared image neighborhood due to the introduction of the analysis and calculation of the incident light component, and has better contrast enhancement. effect, but its method introduces logarithmic calculation, which is difficult in engineering implementation
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[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:
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[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 af...
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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
technical field [0001] The invention belongs to the technical field of image processing and relates to a method for enhancing the contrast of infrared images with a wide dynamic range. Background technique [0002] Most of the existing infrared thermal imaging cameras have the characteristics of low contrast, high noise and poor visual effect under the condition of wide dynamic range, which seriously affects the image of infrared products. Therefore, it is very important for infrared products to choose a suitable infrared image contrast enhancement method to improve the visual effect of infrared images. [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 proces...
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Login to View More IPC IPC(8): G06T5/00
CPCG06T2207/20024G06T2207/10048G06T5/90
Inventor 刘琼焦晓鹏毛义伟汪江华
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC