FPGA (field programmable gate array)-based infrared image detail enhancing system and method

Abstract

The invention discloses an FPGA (field programmable gate array)-based infrared image detail enhancing system and method. The system comprises a bilateral filtering module, a gaussian filtering module, a histogram projecting module and an automatic gain control module, wherein the bilateral filtering module is connected with the gaussian filtering module which is connected with the histogram projecting module and the automatic gain control module respectively, and original input data firstly passes through the bilateral filtering module to obtain image pattern fundamental frequency information; the fundamental frequency information passes through the gaussian filtering module to be smoothened, and differencing is carried out between a result and the original input data so as to obtain image detail information; and the detail information is amplified by the automatic gain control module, the fundamental frequency information is compressed by the histogram projecting module, and the detail information and the fundamental frequency information are summed to obtain an output image. According to the invention, the contrast ratio of the image can be improved, the detail information can be enhanced, background noise can be restrained, and the common problems that the edge is fuzzy and a visual effect is poor in the image of a thermal infrared imager imaging system in the prior art can be solved.

Description

technical field [0001] The invention belongs to the technical field of infrared thermal imaging, in particular to an FPGA-based infrared image detail enhancement system and method thereof. Background technique [0002] Modern high-performance thermal imaging cameras can output infrared original images with a large dynamic range. The original detector data range is generally 12-14 bits of data, which obviously exceeds the dynamic range of the display device. Generally, a typical display device, such as a monitor, can only receive an 8-bit image signal. In addition, the average human eye can only distinguish 128 gray levels. Therefore, after obtaining an original image with a high dynamic range, a necessary process is to remap the original image with a high dynamic range to compress its dynamic range. This process usually needs to achieve two purposes: first: to make the dynamic range of the output image match the dynamic range of the display. Second: While completing the f...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an infrared image detail enhancement system and method based on FPGA, which can improve the contrast of the image, enhance the detail information, suppress background noise, and solve the general blurring of the image in the imaging system of the current infrared thermal imager. The technical problem of low detail area and poor visual effect

[0008] Compared with the prior art, the present invention has significant advantages: (1) The present invention can compress the input large dynamic range image data to a dynamic range suitable for display. During this compression process, the contrast of the image is improved, the detailed information is enhanced, Suppresses background noise, solves the technical problems of general image blurring, low contrast and detail distinction, and poor visual effect in the current infrared thermal imager imaging system, and realizes the ability to distinguish scene objects that cannot be achieved by existing detail enhancement methods

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