A Hybrid Approach to Local Contrast Enhancement Using Adaptive Neural Network Parameter Control

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Abstract

Relevance. Modern image processing techniques are focused on enhancing visual quality, particularly through adaptive local contrast enhancement. Previously, classical algorithms were employed to achieve high contrast efficiency; however, these approaches failed to account for the global scene context and often led to noise amplification. This paper proposes a hybrid method for adaptive local image contrast enhancement utilizing neural network-based parameter adjustment.The aim of this research is to develop an algorithm that provides optimal contrast enhancement while minimizing noise artifacts and distortions, thereby improving contrast and real-time object detection accuracy.The essence of the proposed solution lies in employing a convolutional neural network for automatic configuration of local contrast parameters based on statistical brightness characteristics and textural image features. The proposed method incorporates image segmentation into local regions, analysis of their properties, and adaptive adjustment of processing parameters. This results in improved discernibility of low-contrast objects under various imaging conditions. The algorithm's operating principle is based on dynamically selecting local region dimensions and contrast parameters depending on background and target scene objects. The integration of a neural network module enables precise adjustment of processing parameters while minimizing undesirable artifacts such as halos and blockiness. The methodology has been implemented as software and hardware for an optoelectronic system designed for computer vision applications, aerial image processing, video surveillance systems, and locating victims in various disaster scenarios.The scientific novelty of this work lies in the development of an algorithm that automatically regulates contrast parameters based on analysis of both global and local scene context using artificial intelligence.The theoretical significance of the work consists in the development of a contrast enhancement algorithm and image quality assessment method that accounts for contrast perception characteristics by both humans and AI systems under challenging observational conditions, such as fog, smoke, low illumination, etc.The practical significance of the developed algorithm is determined by its implementation of contrast enhancement for objects in images acquired in both visible and infrared spectral ranges, and by the reliability of their recognition using artificial intelligence.

About the authors

I. Yu. Gritskevich

The Bonch-Bruevich Saint Petersburg State University of Telecommunications

Email: gritskevich.iu@sut.ru

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