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Infrared image detail enhanced dynamic range compression method

A dynamic range compression, infrared image technology, applied in the field of image processing, can solve problems such as loss, and achieve the effects of improving display contrast, improving display grayscale utilization, and enhancing detail information

Active Publication Date: 2019-09-10
浙江黑卡电气有限公司
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Problems solved by technology

However, histogram equalization will enhance the image and noise composed of pixels with high probability density at the same time, while the target and details with low probability density will be suppressed or even lost.

Method used

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  • Infrared image detail enhanced dynamic range compression method
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  • Infrared image detail enhanced dynamic range compression method

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Embodiment Construction

[0060] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0061] Such as Figure 1-2 As shown, a dynamic range compression method for infrared image detail enhancement, comprising the following steps:

[0062] (1) Statistically input the histogram of the AD value of the infrared image; statistically input the gray level X of the AD value of the infrared image k The number of occurrences, denoted as H(X k ). Where k is the index number, k=0, 1, 2, ..., L-1, X k Indicates the kth gray level of the image to be processed. L is the total number of gray levels in the image, when the data width is 14 bits, L=2 14 =16384.

[0063] (2) Find the maximum AD value X with the number of pixels in the histogram greater than 0 max with minim...

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Abstract

The invention relates to the technical field of image processing, and particularly discloses an infrared image detail enhanced dynamic range compression method. The method comprises the following steps of counting a histogram of an input infrared image AD value; searching a maximum AD value Xmax and a minimum AD value Xmin of which the pixel number is greater than 0 in the histogram; calculating amapped minimum AD value Xs0; calculating a mapped maximum AD value Xs5; searching the AD value Xp1 with the largest number of pixels in the [Xs0, Xs5] interval in the histogram; (6) searching a lowerboundary AD value Xs1 of the main region 1 from Xp1 to Xs0; searching an upper boundary AD value Xs2 of the main area 1 from Xp1 to Xs5; searching the maximum AD value Xp2 of the number of pixels inthe [Xs2, Xs5] interval in the histogram; searching a lower boundary AD value Xs3 of the main area 2 from Xp2 to Xs2; searching an upper boundary AD value Xs4 of the main area 2 from Xp2 to Xs5; calculating the AD number of the main region and the AD number of the transition region; calculating the number of mapping gray levels of the transition region; calculating the mapping gray degree of the main area 1; calculating the mapping gray degree of the main area 1; calculating mapping gray levels respectively corresponding to the AD values; and mapping the AD value of the input infrared image toa [Ys0, Ys5] range gray value, and displaying the gray value on a display device.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a dynamic range compression method for infrared image detail enhancement. Background technique [0002] In the application scene of infrared thermal imaging, when low temperature and high temperature objects exist at the same time, the overall dynamic range from the lowest temperature to the highest temperature of the thermal radiation is relatively large, but the temperature distribution in the local area of ​​the object is relatively moderate, and the temperature difference is generally relatively small. In order not to lose the small changes of the temperature signal and take into account the large dynamic range, the high-performance infrared imaging system usually uses 14-bit or higher A / D to sample the output signal of the infrared detector, so as to preserve the detailed information in the scene to the greatest extent. Since the display device generally uses 8-bit ...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T5/40G06T9/00
CPCG06T5/40G06T9/00G06T5/94
Inventor 陈瑛
Owner 浙江黑卡电气有限公司
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