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Image calibration and analysis toolbox – a free software suite for objectively measuring reflectance, colour and pattern
An image processing toolbox that generates images that are linear with respect to radiance from the RAW files of numerous camera brands and can combine image channels from multispectral cameras, including additional ultraviolet photographs, which enables objective measures of reflectance and colour using a wide range of consumer cameras.
Quantifying camouflage: how to predict detectability from appearance
A new method for measuring disruptive camouflage based on an understanding of sensory processing and the way in which false edges are thought to interfere with animal outlines is developed, highlighting the importance of false edges in concealment over and above pattern or luminance matching.
Phenotype–environment matching in sand fleas
This work provides some of the first direct evidence that animal coloration is tuned to provide camouflage to prospective predators against a range of visual backgrounds, in a population of animals occurring over a small geographical range.
Camouflage predicts survival in ground-nesting birds
- J. Troscianko, J. Wilson‐Aggarwal, M. Stevens, C. Spottiswoode
- Environmental ScienceScientific reports
- 29 January 2016
It is shown for the first time in a natural system, that survival probability of wild animals is directly related to their level of camouflage as perceived by the visual systems of their main predators.
Repeated targeting of the same hosts by a brood parasite compromises host egg rejection
It is shown experimentally that hosts reject eggs that differ from an internal template, but crucially, as the proportion of foreign eggs increases, hosts are less likely to reject them and require greater differences in appearance to do so.
Defeating Crypsis: Detection and Learning of Camouflage Strategies
The results show that the survival advantage of camouflage strategies reflects both their ability to avoid initial detection and resist predator learning, including the number of prey types seen and whether subjects encountered targets simultaneously or sequentially.
Extreme binocular vision and a straight bill facilitate tool use in New Caledonian crows.
- J. Troscianko, A. V. von Bayern, Jackie Chappell, C. Rutz, G. Martin
- BiologyNature communications
- 9 October 2012
It is shown that tool use in New Caledonian crows Corvus moneduloides is facilitated by an unusual visual-field topography and bill shape, the first evidence for tool-use-related morphological features outside the hominin lineage.
A simple tool for calculating egg shape, volume and surface area from digital images
- J. Troscianko
- 1 October 2014
A novel mathematical formula is presented to describe the curvature of a bird's egg that can be used to calculate the shape, volume and surface area of an egg precisely from digital images and is demonstrated to have a greater level of accuracy than length- and breadth-based methods.
The Ecological Significance of Tool Use in New Caledonian Crows
Stable isotope analysis reveals the nutritional benefits of tool use in wild New Caledonian crows and provides estimates of larva-intake rates and shows that just a few larvae can satisfy a crow’s daily energy requirements, highlighting the substantial rewards available to competent tool users.
Changes in Women’s Facial Skin Color over the Ovulatory Cycle are Not Detectable by the Human Visual System
It is concluded that changes in skin color are not responsible for the effects of the ovulatory cycle on women’s attractiveness and variation in skin redness is unlikely to be detectable by the human visual system.