Bidirectional histogram equalization processing method and system for infrared images

A histogram equalization and infrared image technology, applied in image data processing, image enhancement, instruments, etc., can solve the problems of unclear target details, difficult to determine the gray center of the image, and incoordination of image visual sensitivity

Active Publication Date: 2015-04-29
CRM ICBG (WUXI) CO LTD
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Problems solved by technology

[0005] 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 proces

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  • Bidirectional histogram equalization processing method and system for infrared images
  • Bidirectional histogram equalization processing method and system for infrared images
  • Bidirectional histogram equalization processing method and system for infrared images

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Embodiment Construction

[0049] Such as figure 1 As shown, the invention provides a kind of infrared image bidirectional histogram equalization processing method: comprising:

[0050] 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 bidirectional histogram equalization processing method and system for infrared images. The input infrared images are processed to form histograms, high and low boundaries are further calculated, image gray center-of-gravity positions are calculated by the aid of a preset platform value and the high and low boundaries, and then shades and highlights divided by the center-of-gravity positions are equalized respectively, thus, the calculation method is higher in adaptability and has obvious advantages in processing images with large backgrounds and small target details, the data calculation amount and the design cost are effectively decreased, and meanwhile, through analysis of centers of gravity of the images, and highlight target details of the infrared images are embodied more obviously and relatively conform to the human eye observation habit; besides, compared with existing platform histogram equalization processing methods and systems, the method and the system have the advantages that the processed highlight target details are not excessively exaggerated, and embodiment of other details of the shades of the infrared images is facilitated.

Description

Technical field: [0001] The invention relates to infrared image processing, in particular, to an infrared image histogram equalization processing technology. Background technique: [0002] 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 gray center of gr...

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Application Information

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IPC IPC(8): G06T5/00G06T5/40
Inventor 梅平吕超英龚亮
Owner CRM ICBG (WUXI) CO LTD
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