Evaluation of validity of observer test for testing of camouflage patterns

František Racek; Adam Jobánek; Teodor Baláž; Jaroslav Krejčí

doi:10.1117/12.2325101

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9 October 2018 Evaluation of validity of observer test for testing of camouflage patterns

František Racek, Adam Jobánek, Teodor Baláž, Jaroslav Krejčí

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Proceedings Volume 10794, Target and Background Signatures IV; 107940E (2018) https://doi.org/10.1117/12.2325101
Event: SPIE Security + Defence, 2018, Berlin, Germany

Abstract

Physical characteristics of camouflage patterns such as color or remission spectra can be tested and measured by objective methods. In the vast majority of use of camouflage pattern, the human (obscure person) will recognize the camouflaged object. Therefore, the quality of the camouflage pattern ultimately determines how a person in a given environment perceives the camouflage pattern. Human perception is very subjective, and its assessment cannot be measured by simple physical methods. Therefore, we process the observer’s visual performance when searching for camouflaged objects. It must always be based on the statistical processing of information on perceived quality of camouflage by individual observers. One of the methods for assessing the quality of camouflage surfaces is so called observer test. The observer test is a simple visual test in which a number of viewers observe a series of images of different scenes containing camouflaged object. The time taken to find the camouflaged object is measured. Depending on the time, it takes to find the camouflaged object, the quality of the camouflage pattern is judged. The time required to find a camouflaged object depends, among other, on the arrangement of the scene, the conditions of the observer test, how the observer interacts with the test interface, the observer's properties and last but not least the camouflage pattern quality. The time taken to find a camouflaged object by a particular observer in a particular frame must be assumed as a random variable because it depends on a large number of independent factors. The rated quality of the camouflage pattern is only one of these factors. Among the others, it was aim of the experiment we performed to evaluate the statistical behavior of the random variable to be able to describe the behavior of it by a suitable type of distribution.

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František Racek, Adam Jobánek, Teodor Baláž, and Jaroslav Krejčí "Evaluation of validity of observer test for testing of camouflage patterns", Proc. SPIE 10794, Target and Background Signatures IV, 107940E (9 October 2018); https://doi.org/10.1117/12.2325101

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