Evaluation of smokescreen jamming effect on electro-optical imaging systems

Abstract

Methods for quantitatively evaluating smokescreen jamming effect on electro-optical imaging systems are investigated. Smokescreen jamming could degrade the target discrimination ability of imaging systems. Based on the theory of digital image processing and the Johnson criterion for target detection and discrimination, which describes the quantitative relationship between the resolving power and target discrimination ability of imaging systems, four rules for quantitatively evaluating smokescreen jamming effect on imaging systems are proposed as the target-discrimination-grade rule, target-discrimination-probability rule, target-discrimination-range rule and correlativity rule. For the target-discrimination-grade rule, the smokescreen jamming effect is evaluated according to the change of target discrimination grade of the imaging system after being jammed. For the target-discrimination-probability rule, the jamming effect is evaluated according to the ratio of the discrimination probabilities of the imaging system before and after being jammed. For the target-discrimination-range rule, the jamming effect is evaluated according to the ratio of the discrimination ranges before and after being jammed, or the decline rate of discrimination range of the imaging system after being jammed. For the correlativity rule, the jamming effect is evaluated and graded as three jamming levels according to the correlativity between the images of the imaging system before and after being jammed, which could be expressed with the mean absolute difference or correlation function between the images before and after being jammed. Compared with the existing evaluation methods for the jamming effect on electro-optical imaging systems, the evaluation rules given here are featured as more quantitative, objective and readily applicable.