STARE, a sonar data post-processing and visualisation software package

This paper presents STARE, a sonar-data post-processing and visualisation toot developed by TNO and written in Matlab 6.5. The software takes into account all available acoustic and non-acoustic data (GPS, radar, source/receiver position, time latencies, etc.). The latter can be used to get optimal position information for the identified sonar...

Visual comfort of binocular and 3D displays

Imperfections in binocular image pairs can cause serious viewing discomfort. For example, in stereo vision systems eye strain is caused by unintentional mismatches between the left and right eye images (stereo imperfections). Head-mounted displays can induce eye strain due to optical misalignments. We have experimentally determined the level of ...

The CIE94 colour difference formula for describing visual detection thresholds in static noise

The parametric factors kL, kC and kH that scale the CIELAB components kL*, kC* and kH* in the CIE94 colour difference formula are unity under reference conditions. When the conditions are changed, the scaling factors may be adapted to account for the influence of specific experimental conditions on perceived colour differences. We determined...

Video content representation on tiny devices

The perceptual satisfaction of a user watching video on a tiny mobile device is constrained by the display capability and network bandwidth. To maximize the user's perceptual satisfaction in this constrained environment, we propose a new method to adaptively represent the video content in real-time on tiny devices according to the user's...

Vibrotactile in-vehicle navigation system

A vibrotactile display, consisting ofeight vibrating elements or tactors mounted in a driver's seat, was tested in a driving simulator. Participants drove with visual, tactile and multimodal navigation displays through a built-up area. Workload and the reaction time to navigation messages were measured for normal and high workload conditions....

Stimuli fixation and manual response as a function of expectancies

Two experiments investigated effects of expectations on eye fixations and responses to expected and unexpected information in a laboratory setting. Stimulus fixation and manual responses to predefined targets among distractors were measured in a dynamic environment shown on a monitor. Participants were part of either a predictable condition ...

A new universal colour image fidelity metric

We extend a recently introduced universal grayscale image quality index to a newly developed perceptually decorrelated colour space. The resulting colour image fidelity metric quantifies the distortion of a processed colour image relative to its original version. We evaluated the new colour image fidelity metric through observer experiments in...

Additive and subtractive transparent depth displays

Image fusion is the generally preferred method to combine two or more images for visual display on a single screen. We demonstrate that perceptual image separation may be preferable over perceptual image fusion for the combined display of enhanced and synthetic imagery. In this context image separation refers to the simultaneous presentation of...

Plastic transistors in active-matrix displays

The handling of grey levels by these large displays paves the way for electronic paper.

Compensation for delay in the visual display of a driving simulator

One of the aspects that cause an interactive vehicle simulator to differ from the real system is delay in the visual display. Because of this delay, the person in the simulator receives visual feedback of his control actions slightly later when compared with the real system, which can reduce the task performance. Compensation techniques can be...

Visual strain: a comparison of monitors and head-mounted displays

New methods to measure information uptake and eye strain have been developed. The speed of information uptake is measured with a reading task that demands quick and accurate eyemovements. Accommodative facility is shown to be a good measure for eye strain. A standard monitor and three types of HMDs were compared on both tasks. The HMDs were (i)...

A review of ISO and CEN standards on ergonomics

In recent years an increasing number of official ergonomic standards has become available world-wide. The International Standardization Organization (ISO) and the European standardization organization Comite Europeen de Normalisation (CEN) have published 28 ergonomic standards, whereas 69 standards are in preparation. VDU-work, danger signals,...

Interactive stereoscopy optimization for head-mounted displays

In current virtual environment systems, the stereoscopic images presented in a head-mounted display are far from optimal. The aim is to achieve orthostereoscopy, which roughly means images should `behave as in real life.' A theoretical model of stereoscopic optics was used to implement a test and optimization system. Tests were devised to...