Adaptive image stretching method and device in a real-time infrared imaging system
An infrared imaging system and image stretching technology, applied in the field of infrared imaging, can solve problems such as inability to promote, high operating frequency hardware resources, and difficulty in meeting real-time requirements.
Active Publication Date: 2015-10-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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However, in these algorithms, in order to realize the adaptive adjustment of the parameters of the enhancement algorithm in dynamic scenes, real-time calculations with a large amount of calculation must be performed, and the amount of calculation is multiplied with the increase of the image array, so it is difficult to meet the real-time requirements. , and requires a high operating frequency and a large number of hardware resources, it cannot be promoted in some low-cost, low-power applications
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[0036] Such as figure 1 As shown, in one embodiment of the present invention, an adaptive image stretching method in a real-time infrared imaging system includes the following steps:
[0037] Step 10: Obtain the maximum and minimum values of the stretching threshold of the previous frame image;
[0038] In this embodiment, when the current frame image is stretched, the maximum stretch threshold value and the minimum stretch threshold value of the previous frame image may be obtained.
[0039] In the image stretching process of an infrared imaging system, it is usually performed in the form of frames, and multiple frames of images are processed sequentially. When processing the current frame, various processing parameters of the previous frame image are known, that is, the stretching threshold of the previous frame image is known. Generally, the stretching threshold of an image includes a maximum value and a minimum value, that is, a stretching threshold maximum value and a...
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The embodiment of the invention discloses a self-adaptive image stretching method and device in a real-time infrared imaging system. The method comprises the following steps of: acquiring a stretching threshold maximum value and a stretching threshold minimum value of a previous frame of an image; acquiring current image datum of the current frame; calculating first quantity of points of which the gray degrees are greater than the stretching threshold maximum value in the current image data; calculating second quantity of points of which the gray degrees are smaller than the stretching threshold minimum value in the current image data; calculating a current stretching threshold maximum value of the current frame according to the first quantity and the stretching threshold maximum value; calculating a current stretching threshold minimum value of the current frame according to the second quantity and the stretching threshold minimum value; and stretching the current frame according to the current stretching threshold maximum value and the current stretching threshold minimum value. According to the embodiment of the invention, a stretching threshold of the current frame of the image is acquired by means of rejection and is adjusted according to the difference between the frames, so that complicated counting algorithm of histogram and massive calculation quantity of real-time adjustment of stretching parameters are avoided.
Description
technical field [0001] The invention relates to the field of infrared imaging, in particular to an adaptive image stretching method and device in a real-time infrared imaging system. Background technique [0002] Due to the influence of target radiation characteristics, infrared transmission characteristics, infrared detection characteristics and environmental factors, the imaging quality of infrared imaging is far lower than that of visible light images, mainly reflected in very low contrast and signal-to-noise ratio. The most notable feature that distinguishes infrared images from visible light images is "high background and low contrast", that is, the background radiation occupies a larger dynamic display range of the image while the target occupies a smaller dynamic range. Therefore, in order to correctly identify the target from the infrared image, image enhancement processing must be carried out in the infrared imaging component. [0003] Infrared image enhancement te...
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IPC IPC(8): G06T5/50
Inventor 吕坚江桥熊丽霞杜一颖周云
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA