Mr. Justin R. Plantier Profile

Justin R. Plantier

at IMASSA-CERMA

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Proceedings Article | 25 May 2005 Paper

New technologies lead to a new frontier: cognitive multiple data representation

S. Buffat, F. Liege, J. Plantier, C. Roumes

Proceedings Volume 5809, (2005) https://doi.org/10.1117/12.603383

KEYWORDS: Sensors, Spatial frequencies, Visualization, Radar, Image fusion, Infrared radiation, Object recognition, Diagnostics, Infrared sensors, Image filtering

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The increasing number and complexity of operational sensors (radar, infrared, hyperspectral...) and availability of huge amount of data, lead to more and more sophisticated information presentations. But one key element of the IMINT line cannot be improved beyond initial system specification: the operator.... In order to overcome this issue, we have to better understand human visual object representation. Object recognition theories in human vision balance between matching 2D templates representation with viewpoint-dependant information, and a viewpoint-invariant system based on structural description. Spatial frequency content is relevant due to early vision filtering. Orientation in depth is an important variable to challenge object constancy. Three objects, seen from three different points of view in a natural environment made the original images in this study. Test images were a combination of spatial frequency filtered original images and an additive contrast level of white noise. In the first experiment, the observer's task was a same versus different forced choice with spatial alternative. Test images had the same noise level in a presentation row. Discrimination threshold was determined by modifying the white noise contrast level by means of an adaptative method. In the second experiment, a repetition blindness paradigm was used to further investigate the viewpoint effect on object recognition. The results shed some light on the human visual system processing of objects displayed under different physical descriptions. This is an important achievement because targets which not always match physical properties of usual visual stimuli can increase operational workload.

Proceedings Article | 11 August 1998 Paper

Perception of distance in a binocular helmet-mounted display: data from helicopter in-flight video tapes

Corinne Roumes, Justin Plantier, Alain Leger

Proceedings Volume 3362, (1998) https://doi.org/10.1117/12.317456

KEYWORDS: Sensors, Cameras, Head-mounted displays, Video, Environmental sensing, Image sensors, Fourier transforms, Statistical analysis, Safety, Optical components

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An experiment was performed to determine if the geometrical arrangement of sensors delivering images from the environment, could influence distance perception is a binocular helmet-mounted display (HMD). A pair of cameras were settled in the front part of a PUMA helicopter. Video tapes were recorded during low altitude flights. Six camera settings were tested resulting from 3 magnitudes of the separation between the sensors, and 2 arrangements of the optical axes of the cameras: parallel or convergent. Displaying the image of a single camera on both optics of the HMD provided an additional condition which served as a reference free of binocular depth cue. The video tapes were displayed on a 40 degree full overlap HMD. Eleven helicopter pilots ran the experiment. Objective comparison of the sensor configurations was based on distance or height estimation following a bi-section paradigm. As a subjective comparison, the pilots classified the sensor configurations according to the quality of 3D perception of the environment. Objective data show that flight safety is increased when the separation between the senor is larger in both convergent and parallel settings. Subjectively, the pilots preferred the wide separation and convergent setting of the cameras.

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