1. Developing and Evaluating a Target-Background Similarity Metric for Camouflage Detection
- Author: journals.plos.org
- Date Submitted: 09/24/2020 09:46 PM
- Average star voting: (4.86/5 stars and 68275 reviews)
- Summary: Background Measurement of camouflage performance is of fundamental importance for military stealth applications. The goal of camouflage assessment algorithms is to automatically assess the effect of camouflage in agreement with human detection responses. In a previous study, we found that the Universal Image Quality Index (UIQI) correlated well with the psychophysical measures, and it could be a potentially camouflage assessment tool. Methodology In this study, we want to quantify the camouflage similarity index and psychophysical results. We compare several image quality indexes for computational evaluation of camouflage effectiveness, and present the results of an extensive human visual experiment conducted to evaluate the performance of several camouflage assessment algorithms and analyze the strengths and weaknesses of these algorithms. Significance The experimental data demonstrates the effectiveness of the approach, and the correlation coefficient result of the UIQI was higher than those of other methods. This approach was highly correlated with the human target-searching results. It also showed that this method is an objective and effective camouflage performance evaluation method because it considers the human visual system and image structure, which makes it consistent with the subjective evaluation results.
- Match with the search results: Feb 3, 2014 … Background Measurement of camouflage performance is of fundamental importance for military stealth applications. The goal of camouflage …
2. Background matching in the brown shrimp Crangon crangon: adaptive camouflage and behavioural-plasticity | Scientific Reports
- Author: www.nature.com
- Date Submitted: 01/21/2019 02:30 AM
- Average star voting: (3.55/5 stars and 40504 reviews)
- Summary: A combination of burrowing behaviour and very efficient background matching makes the brown shrimp Crangon crangon almost invisible to potential predators and prey. This raises questions on how shrimp succeed in concealing themselves in the heterogeneous and dynamic estuarine habitats they inhabit and what type of environmental variables and behavioural factors affect their colour change abilities. Using a series of behavioural experiments, we show that the brown shrimp is capable of repeated fast colour adaptations (20% change in dark pigment cover within one hour) and that its background matching ability is mainly influenced by illumination and sediment colour. Novel insights are provided on the occurrence of non-adaptive (possibly stress) responses to background changes after long-time exposure to a constant background colour or during unfavourable conditions for burying. Shrimp showed high levels of intra- and inter-individual variation, demonstrating a complex balance between behavioural-plasticity and environmental adaptation. As such, the study of crustacean colour changes represents a valuable opportunity to investigate colour adaptations in dynamic habitats and can help us to identify the mayor environmental and behavioural factors influencing the evolution of animal background matching.
- Match with the search results: Feb 19, 2018 … Indeed, the ability to rapidly change colour is a common strategy employed by many animals to tune and adjust their camouflage abilities to …
3. Background matching and disruptive coloration as habitat-specific strategies for camouflage | Scientific Reports
- Author: www.nature.com
- Date Submitted: 06/22/2021 06:04 AM
- Average star voting: (4.02/5 stars and 49666 reviews)
- Summary: Camouflage is a key defence across taxa and frequently critical to survival. A common strategy is background matching, resembling the colour and pattern of the environment. This approach, however, may be ineffective in complex habitats where matching one patch may lead to increased visibility in other patches. In contrast, disruptive coloration, which disguises body outlines, may be effective against complex backgrounds. These ideas have rarely been tested and previous work focuses on artificial systems. Here, we test the camouflage strategies of the shore crab (Carcinus maenas) in two habitats, being a species that is highly variable, capable of plastic changes in appearance, and lives in multiple environments. Using predator (bird and fish) vision modelling and image analysis, we quantified background matching and disruption in crabs from rock pools and mudflats, predicting that disruption would dominate in visually complex rock pools but background matching in more uniform mudflats. As expected, rock pool individuals had significantly higher edge disruption than mudflat crabs, whereas mudflat crabs more closely matched the substrate than rock pool crabs for colour, luminance, and pattern. Our study demonstrates facultative expression of camouflage strategies dependent on the visual environment, with implications for the evolution and interrelatedness of defensive strategies.
- Match with the search results: May 24, 2019 … Camouflage is a key defence across taxa and frequently critical to survival. A common strategy is background matching, resembling the colour …
4. Camouflage through behavior in moths: the role of background matching and disruptive coloration
- Author: academic.oup.com
- Date Submitted: 03/01/2020 08:09 AM
- Average star voting: (3.72/5 stars and 73275 reviews)
- Summary: Lay summary. Cryptic moths are able to seek out locations and change their body orientations after landing on tree trunks to improve camouflage. Moths rest on b
- Match with the search results: A range of concealing mechanisms has been proposed for effective camouflage, including background matching and disruptive coloration ( Thayer 1918 ; Cott 1940 ; …