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Infrared image dynamic range compression method

A dynamic range compression and infrared image technology, applied in image enhancement, image analysis, image coding, etc., can solve problems such as lack of details, achieve the effect of enhancing local contrast, reducing image flicker, and taking into account both imaging quality and efficiency

Pending Publication Date: 2022-06-28
WUHAN GUIDE SENSMART TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In infrared images, the gray level of the background area is relatively concentrated, and the target is usually smaller and has less gray level. Histogram mapping can better display the level of the background area of ​​the image, but the target with less gray level often lacks details.

Method used

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  • Infrared image dynamic range compression method
  • Infrared image dynamic range compression method
  • Infrared image dynamic range compression method

Examples

Experimental program
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Embodiment 1

[0048] This embodiment provides a method for compressing the dynamic range of an infrared image, including:

[0049] S100. Obtain the high dynamic range infrared image I output by the infrared detector src ;

[0050] S200. Using the platform histogram equalization algorithm for infrared image I src Perform one-level compression to obtain the histogram map image I0 of the first-level mapping dst ;

[0051] S300. based on the linear dynamic compression algorithm and the histogram mapping image I0 dst Perform secondary compression to obtain the histogram map image Idst of secondary mapping.

[0052] In this embodiment, S200 specifically includes:

[0053] For infrared images I src Process to obtain the platform histogram mapping table nPlatHistMapTable; in an optional scheme, for the high dynamic range infrared image I src Calculation is performed to obtain the grayscale histogram nHist of the infrared image; for the infrared image I srcThe number of occurrences of each g...

Embodiment 2

[0070] Based on the foregoing Embodiment 1, this embodiment discloses another infrared image dynamic range compression method, such as figure 2 ,include:

[0071] S100. Obtain the high dynamic range infrared image I output by the infrared detector src ; In this embodiment, the infrared image is the output electrical signal of the infrared detector, which can be directly obtained by the infrared detector. The output signal of the infrared detector is usually 14bit or 16bit, and the display device can only display 8bit image, so the dynamic range of the infrared image needs to be compressed.

[0072] S200. For Infrared Image I src The number of occurrences of each gray level is counted, and the length of the histogram is obtained as nHistLen. Specifically, histogram statistics are the basic method of image processing. The histogram can let you know the overall image pixel intensity distribution, and its X axis is the pixel value (usually in the range of 0 to 255), on the Y-a...

Embodiment 3

[0096] The present invention also discloses an electronic device, comprising: a memory for storing instructions executable by a processor; and a processor configured to execute the instructions to implement the methods described in Embodiment 1 and Embodiment 2.

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Abstract

The invention provides a method for compressing the dynamic range of an infrared image. The method comprises the following steps: acquiring a high-dynamic-range infrared image Isrc output by an infrared detector; performing first-level compression on the infrared image Isrc by adopting a platform histogram equalization algorithm to obtain a first-level mapped histogram mapping image I0dst; and performing secondary compression based on a linear dynamic compression algorithm and the histogram mapping image I0dst to obtain a histogram mapping image Idst of secondary mapping. According to the invention, the obtained infrared image contains richer information, the local contrast is higher, and the visual perception of people is better.

Description

technical field [0001] The invention relates to the field of infrared image processing, in particular to a method for compressing the dynamic range of an infrared image. Background technique [0002] With the maturity of infrared thermal imaging technology, users have higher and higher requirements for the imaging quality of thermal imaging cameras. The output signal of the infrared detector is usually 14bit or 16bit, and the display device can only display 8bit image, so the dynamic range of the infrared image needs to be compressed. There are two commonly used dynamic range compression methods: linear mapping and nonlinear mapping. When the dynamic range of the infrared image is large and the proportion of invalid gray levels is large, the effective gray levels after linear mapping are less, and the image information is seriously lost. Nonlinear mapping usually adopts histogram equalization and its improved algorithm, and performs tone mapping according to the probabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T9/00G06T5/40
CPCG06T9/00G06T5/40G06T2207/10048
Inventor 黄晟龚忠毅崔昌浩王鹏周汉林商长弘
Owner WUHAN GUIDE SENSMART TECH CO LTD
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