Searched for: subject%3A%22Conspicuity%22
(1 - 17 of 17)
document
van der Burg, E. (author), Yu, J. (author), Hogervorst, M.A. (author), Bin, L. (author), Culpepper, J. (author), Toet, A. (author)
In order to assess camouflage and the role of movement under widely ranging (lighting, weather, background) conditions simulation techniques are highly useful. However, sufficient level of fidelity of the simulated scenes is required to draw conclusions. Here, live recordings were obtained of moving soldiers and simulations of similar scenes...
conference paper 2021
document
Dijk, J. (author), van Eekeren, A.W.M. (author), Toet, A. (author), den Hollander, R.J.M. (author), Schutte, K. (author), van Heijningen, A.W.P. (author), Bijl, P. (author)
For many military operations, situational awareness is of great importance. During night conditions, this situational awareness can be improved using both analog and digital image-intensified cameras. The quality of image intensifiers is a topic of interest. One of the differences between a digital and analog system is noise behavior. For...
article 2013
document
Toet, A. (author)
The predictions of 13 computational bottom-up saliency models and a newly introduced Multiscale Contrast Conspicuity (MCC) metric are compared with human visual conspicuity measurements. The agreement between human visual conspicuity estimates and model saliency predictions is quantified through their rank order correlation. The maximum of the...
article 2011
document
Beintema, J.A. (author), Toet, A. (author), de Vries, S.J. (author)
The construction and validation of soldier combat models requires data on the conspicuity of camouflaged targets in the field, and human targets in particular. So far, this data is lacking. Also, it si currently unknown to what degree luminance contrast and motion contribute to target conspicuity. These data are needed to enable the validation...
conference paper 2011
document
TNO Defensie en Veiligheid (author), Hogervorst, M.A. (author), Toet, A. (author), Jacobs, P. (author)
An international group consisting of several NATO nations participated in a trial in which urban camouflage was developed and compared. First, photographs were taken in and around a small town (arid climate). Next, the different groups derived urban camouflage patterns from these photographs. We applied our method for deriving a camouflage...
conference paper 2010
document
TNO Defensie en Veiligheid (author), Hogervorst, M.A. (author), Toet, A. (author), Bijl, P. (author)
We determined the relationship between search performance with a limited field of view (FOV) and several scanning- and scene parameters in human observer experiments. The observers (38 trained army scouts) searched through a large search sector for a target (a camouflaged person) on a heath. From trial to trial the target appeared at a different...
conference paper 2005
document
TNO Defensie en Veiligheid (author), Toet, A. (author), Kooi, F.L. (author), Kuijper, F.L. (author), Smeenk, R.J.M. (author)
Synthetic imagery used for training and evaluating visual search and detection tasks should result in the same observer performance as obtained in the field. The generation of synthetic imagery generally involves a range of computational approximations and simplifications of the physical processes involved in the image formation, in order to...
conference paper 2005
document
TNO Defensie en Veiligheid (author), Kooi, F.L. (author), Toet, A. (author)
Training is required to correctly interpret NVG imagery. Training night operations with simulated intensified imagery has great potential. Compared to direct viewing with the naked eye, intensified imagery is relatively easy to simulate and the cost of real NVG training is high (logistics, risk, civilian sleep deprivation, pollution). On the...
conference paper 2005
document
van den Broek, A.C. (author), Smith, A.J.E. (author), Toet, A. (author), TNO Fysisch en Elektronisch Laboratorium TNO Technische Menskunde (author)
A study is presented in which several representations of polarimetric SAR data were evaluated for the purpose of obtaining land use classification. Two methods comprising visual interpretation and an automatic procedure were used. For the study, fully polarimetric SAR data with a resolution of 3m were obtained with the Dutch PHARUS sensor from a...
article 2004
document
TNO Technische Menskunde (author), Toet, A. (author), Hogervorst, M.A. (author), Bijl, P. (author)
We argue that visual conspicuity and identifiability are two efficient task-related measures that can be deployed to calibrate synthetic imagery that is intended to be used for human visual search and detection tasks. The conspicuity of a target is operationally defined as the region around the center of the visual field where the target is...
conference paper 2004
document
Hogervorst, M.A. (author), Bijl, P. (author), Toet, A. (author), Miller, B. (author)
We present a new measure called target identifiability, as an efficient alternative for measuring identification scores. Identifiability is operationally defined as the amount of blur required to reduce the target signature to its identification threshold. It can quickly be determined using a simple adjustment procedure. To validate the new...
conference paper 2004
document
TNO Technische Menskunde (author), Kooi, F.L. (author)
The conspicuity of six different firefighting garments was measured, from the back and from the side, and at two different positions. The experiment serves as a demonstration of the newly developed technique to quantify conspicuity. The results show that the conspicuity of firefighting garments is indeed measurable. The conspicuity of the six...
article 2003
document
Hogervorst, M.A. (author), Bijl, P. (author), Toet, A. (author), Valeton, J.M. (author)
In order to find an optimal scanning strategy we determined the relationship between search performance and several scanning- and scene parameters in human observer experiments. The observers searched with a limited field of view (FOV) through a large search sector for a target (a camouflaged person) on a heath. From trial to trial the target...
conference paper 2002
document
Toet, A. (author), Bijl, P. (author), Valeton, J.M. (author)
The TNO Human Factors Searchû2 image dataset consists of: a set of 44 high-resolution digital color images of different complex natural scenes, the ground truth corresponding to each of these scenes, and the results of psychophysical experiments on each of these images. The images in the Searchû2 dataset are a subset of a larger set that has...
article 2001
document
Roelfsema, A. (author), Theeuwes, J. (author), Alferdinck, J.W.A.M. (author), Society of Automotive Engineers (author)
In 1993 new European legislation regarding side-markers for passenger cars became effective. Volvo requested the TNO-Human Factors Research Institute (HFRI) to investigate the possible safety benefit of this European side-markers configuration. A test panel at TNO- HFRI was used to determine the difference in response time and detection error of...
bookPart 1999
document
Alferdinck, J.W.A.M. (author), TNO Technische Menskunde (author)
This article gives an overview of the parameters influencing the conspicuity of warning lights. In general, higher light intensities are more conspicuous. A flashing light is better than a continuous light. Flashing frequencies of about 10 Hz are perceived as unpleasant, and below 1 Hz the light has no warning character. Frequencies between 2...
article 1996
document
Instituut voor Zintuigfysiologie TNO (author), Theeuwes, J. (author)
Two visual search experiments were conducted to investigate whether a highly salient stimulus difference automatically attracts spatial attention to its location. Experiment 1 showed that an item unique in form does not automatically draw attention to its location, but that attention could actively be directed to the location of the unique item...
report 1989
Searched for: subject%3A%22Conspicuity%22
(1 - 17 of 17)