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Digital detail enhancing method capable of coping with HDR (high dynamic range) infrared images

A high dynamic range, infrared image technology, applied in image enhancement, image data processing, instruments, etc., can solve the technical requirements of overshoot, false details and detail enhancement, which cannot meet the technical requirements of high dynamic range infrared image digital detail enhancement And other issues

Inactive Publication Date: 2015-04-29
THE 3RD ACAD 8358TH RES INST OF CASC
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  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the digital detail enhancement method in the prior art has the defects of overshoot, false details and inconspicuous detail enhancement, and cannot meet the technical requirements for digital detail enhancement of high dynamic range infrared images

Method used

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  • Digital detail enhancing method capable of coping with HDR (high dynamic range) infrared images
  • Digital detail enhancing method capable of coping with HDR (high dynamic range) infrared images
  • Digital detail enhancing method capable of coping with HDR (high dynamic range) infrared images

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Embodiment 1

[0112] Such as figure 1 As shown, a high dynamic range (14bit) infrared image acquired by a cooled infrared imager with a resolution of 640*512 contains rich details and has a total of 3093 effective gray levels. Adopt the method of the present invention to carry out the step of numerical detail enhancement to this image as follows:

[0113] (1) Obtain the fundamental frequency image and detail image through formula (3) and formula (4), the window w used k The size of is 5*5, the smoothing coefficient ε=3000, the fundamental frequency image such as figure 2 , detail images such as image 3 shown;

[0114] (2) Generate a mapping table through formula (7), and obtain the contrast-adjusted fundamental frequency image B by means of table lookup, such as Figure 4 As shown, the platform threshold at this time is T=103;

[0115] (3) Synthesize the final output image through formula (8) and formula (9), such as Figure 5 As shown, at this time set T 1 =4,T 2 =20.

[0116] D...

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Abstract

The invention belongs to the technical field of photo-electronic imaging, and particularly relates to a digital detail enhancing method capable of coping with HDR (high dynamic range) infrared images. The method comprises steps as follows: Step 1, performing separation of basebands and details on the infrared images by using guide filters; Step 2, adjusting the contrast of baseband images through self-adaptive platform histogram equalization; Step 3, synthesizing final output images. With the adoption of the method, technical problems of overshoot, false details and unobvious detail enhancement in the prior art are solved, fine structures of targets in scenes can be enhanced, the detection and recognition capacity for small targets can be effectively improved, and understanding of image content and key information can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of photoelectric imaging, and in particular relates to a method for implementing digital detail enhancement that can cope with high dynamic range infrared images. Background technique [0002] With the continuous development of infrared detector technology, infrared imagers are more and more widely used in many fields. The infrared image characterizes the infrared radiation distribution of the scene, which mainly depends on the emissivity and temperature distribution of the scene, and its gray scale fluctuation comes from the radiation changes of various parts in the scene radiation. [0003] Generally, the analog signal output by the infrared detector is usually sampled as a digital signal with 14bit precision, which can represent 16384 gray levels in theory. In a common scene, due to the small difference in the infrared radiation of the scene in the scene and the limitation of the detector sensitivity, th...

Claims

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Application Information

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IPC IPC(8): G06T5/50G06T5/40
Inventor 金炎胜杨贺程达霍晓江
Owner THE 3RD ACAD 8358TH RES INST OF CASC
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