Infrared image multistage mean contrast enhancement method

An infrared image and contrast technology, applied in image enhancement, image data processing, instruments, etc., can solve the problems of increasing RAM resources, unfavorable direct implementation of FPGA logic, and large amount of calculation

Inactive Publication Date: 2007-07-11
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, for hardware systems, histogram statistics need to count the number of pixels of each gray level, which requires a large amount of calculation and requires a large amount of RAM resources to store the histogram information, especially when the grayscale dynamic range of the original image is large. The required RAM resources also increase, which is not conducive to the direct implementation of FPGA logic

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Embodiment Construction

[0037] The specific implementation manner of the present invention will be described below in conjunction with the accompanying drawings.

[0038] This implementation mode uses a Stratix series FPGA (EP1S10) of Alter (Altera) Company to realize the above functions, and the size of the processed image is 128×128×16bit.

[0039] The method described in the present invention is applied on the enhancer, and purpose is under the limited FPGA resource condition, under the situation of less logic resource and storage resource overhead, obtains close to the histogram statistical method, and is better than the most value method and Infrared image enhancement effect of mean-variance method.

[0040] Now, the linear transformation to achieve image contrast enhancement is based on the distribution information of the image gray level to determine a minimum value X of linear stretching 0 and the maximum value X 1 , and then linearly transform the entire image grayscale to achieve image co...

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Abstract

The invention relates to an infrared image multi level mean contrast intensification method. The existing image intensifying method is not suitable for the realization of FPGA. The said infrared image multi level mean contrast intensification method comprises multi level mean computation, median filtering, linear intensification with redundant computation removed, getting value X0 and X1 through multi level mean approximation method to add the stability of the treated image, synthetically with the FPGA better than the traditional classic computation realization. Through simple contrast device, accumulator, counter, small circuit scale, less required hardware, low cost, timely feature, it can effectively adapt to the high requirement for infrared imaging equipment image intensification, for the benefit of promotion.

Description

technical field [0001] The invention belongs to a digital image processing method, in particular to a method for enhancing the contrast of an infrared image. Background technique [0002] An infrared image is an imaging of the thermal radiation distribution of a scene. Because the temperature difference between the target and the background in the scene is relatively small, the infrared image has the characteristics of high background and low contrast, and its signal-to-noise ratio is lower than that of the visible light image. In order to correctly recognize the target from the infrared image, the contrast enhancement processing must be carried out on the infrared image. [0003] Contrast enhancement technology is often used in image preprocessing and image display quality improvement, and is widely used in digital image processing systems. Commonly used contrast enhancement algorithms include histogram equalization and linear transformation. [0004] Histogram equalizat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 王岳环张天序曹治国钟胜左峥嵘颜露新
Owner HUAZHONG UNIV OF SCI & TECH
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