A method and system for bidirectional histogram equalization processing of infrared images

A histogram equalization and infrared image technology, applied in image data processing, image enhancement, instruments, etc., can solve problems such as difficulty in determining the gray center of the image, incoordination of image visual sensitivity, and offset of the image gray center of gravity, etc., to achieve image quality The center of gravity is stable, the light and shade are basically consistent, and the effect of strong anti-noise interference ability

Active Publication Date: 2017-08-25
CRM ICBG (WUXI) CO LTD
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Problems solved by technology

[0008] One of the objectives of the present invention is to solve the problem that the gray center of the image is difficult to determine when the platform histogram equalization is processing the infrared image, which leads to the shift of the gray center of gravity of the image, resulting in incoordination of the image's visual perception and inconspicuous target details.

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  • A method and system for bidirectional histogram equalization processing of infrared images
  • A method and system for bidirectional histogram equalization processing of infrared images
  • A method and system for bidirectional histogram equalization processing of infrared images

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Embodiment Construction

[0054] Such as figure 1 As shown, the invention provides a kind of infrared image bidirectional histogram equalization processing method: comprising:

[0055] S1: Form a histogram by processing the input infrared image, and obtain the corresponding pixel gray level value interval according to the bit number b of the infrared image, denoted as n, and corresponding to the gray level value of each pixel in the interval Each histogram statistical value is recorded as HIST_STAT(n). In this embodiment, the histogram takes the gray level as the horizontal axis, and the pixel number as the vertical axis. Of course, in other embodiments, the probability of occurrence of pixels can also be the vertical axis, etc., but the difference in the calculation method is Existing, so do not go into details, the bit number b unit is bit, for example, can be 2bit, 4bit, 8bit, 16bit, etc., n is the pixel gray scale interval, taking the 14bit infrared input image as an example, n∈[ 0,2 14 -1].

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Abstract

The invention provides a method and system for bidirectional histogram equalization processing of infrared images, which forms a histogram by processing the input infrared image, and then calculates the high and low boundaries, and calculates the gray center of gravity of the image through the preset platform value and the high and low boundaries position, and then equalize the dark part and bright part divided by the center of gravity position respectively. In this way, the calculation method is more adaptable and has obvious advantages in processing images with large background and small target details, effectively reducing the amount of data calculation and design At the same time, from the analysis of the center of gravity of the image obtained from the technical solution of the present invention, the details of the target in the bright part of the infrared image will be more obvious, which is more in line with the observation habits of the human eye, and compared with the histogram balance of the existing platform, this The target details of the bright part processed by the technical solution of the invention will not be too exaggerated, which is conducive to the embodiment of other details in the dark part of the infrared image.

Description

[0001] Technical field: [0002] The invention relates to infrared image processing, in particular, to an infrared image histogram equalization processing technology. [0003] Background technique: [0004] Infrared images in a large dynamic range acquired by infrared thermal imaging cameras generally have the problems of low contrast and insufficient detail performance. The ordinary linear stretching or segmented linear stretching method treats the image background and image details equally, and improves the image contrast. At the same time, the proportion of the background pattern to the display gray level is increased, while the real target details only occupy a small amount of display gray level, resulting in insufficient resolution of the target details. Therefore, histogram equalization technology, especially platform histogram technology, has been widely used in infrared thermal imager image processing. A major feature of histogram equalization technology is that the gr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T5/40
Inventor 梅平吕超英龚亮
Owner CRM ICBG (WUXI) CO LTD
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