Infrared chart digital signal processing system and method

Abstract

A system and method for processing digital signals of infrared image, the system comprises a FPGA chip provided on the infrared camera, for processing digital signals of plural-frame infrared images captured by the infrared camera, wherein the FPGA chip comprises: an image process module, which is, in a frame's backward-stroke, to perform a differential weight accumulation process on an original column diagram data representing an original column diagram curve distribution of a current frame image, so as to filter overbright or overdark pixels, and output grayscale value data of a last frame image after being processed by the image process module in last frame's backward-stroke; and an image output module connected with the image process module to receive the grayscale value data of the last frame image, which is, in a frame's forward stroke, to perform a grayscale shift process in way of multi-meandering lines on the received grayscale value data, so as to perform different levels brightness grayscale shift for the grayscale value data on bright or dark side, and output the processed grayscale value data of the last frame image. The present application can provide better scene adaptability for the infrared image.

Description

technical field [0001] The invention relates to the technical field of infrared thermal imaging, in particular to technologies such as digital signal processing (FPGA implementation) of infrared thermal images. Background technique [0002] At present, in most infrared thermal imaging systems, the analog signal output by the infrared detector is converted into a 14-bit digital signal by the front-end A / D, enters the digital signal processing module, and is converted into an 8-bit grayscale signal, and then the video decoding module generates a standard The TV signal is output to the monitor. [0003] In order to turn the input signal with high bit and large dynamic range into a 256-level grayscale signal that conforms to the observation habit of the human eye, the digital signal processing module needs to perform real-time and fast compression / stretching, overflow / cutoff processing, and brightness offset of the digital signal , gain adjustment and other operations, in order...

AI Technical Summary

Problems solved by technology

[0009] The invention is used to solve the problem that the infrared thermal image has poor adaptability and affects the target observation when the scene changes greatly

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