Effects of surrounding brightness on visual search for safety colors

Ochiai, Nobuhisa; Sato, Mitsuru

doi:10.1002/col.20152

Cited by 14 publications

(7 citation statements)

References 13 publications

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“…Colour perception can easily be affected by environmental conditions. Lightning conditions play major role in colour perception and can easily cause variability , and the type of light source is the most important factor for colour perception . However, other factors can affect colour perception among people such as colour blindness, age, gender, nutrition and various medications.…”

Section: Introductionmentioning

confidence: 99%

Repeatability and reliability of human eye in visual shade selection

Özat¹,

Tuncel

Eroğlu

2013

J of Oral Rehabilitation

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Deficiencies in the human visual percep-tion system have challenged the efficiency of the visual shade-matching protocol. The aim of this study was to evaluate the repeatability and reliability of human eye in visual shade selection. Fifty-four volunteering dentists were asked to match the shade of an upper right central incisor tooth of a single subject. The Vita 3D-Master shade guide was used for the protocol. Before each shade-matching procedure, the definitive codes of the shade tabs were hidden by an opaque strip and the shade tabs were placed into the guide randomly. The procedure was repeated 1 month later to ensure that visual memory did not affect the results. The L*, a* and b* values of the shade tabs were measured with a dental spectrophotometer (Vita Easyshade) to produce quantitative values to evaluate the protocol. The paired samples t-test and Pearson correlation test were used to compare the 1st and 2nd selections. The Yates-corrected chi-square test was use to compare qualitative values. Statistical significance was accepted at P < 0·05. Comparing baseline and 1st month records, statistical significance (P < 0·001) was found among qualitative data regarding repeatability on a yes/no (1/0) basis, revealing a very low percentage of repeatability (11·1%). Comparing baseline and 1st month records, statistical significance was not found (P = 0·000) among the L*, a*, b* and ΔE variables. These results indicate that dentists perform insufficiently regarding repeatability in visual shade matching, but they are able to select clinically acceptable shades.

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Section: Introductionmentioning

confidence: 99%

Repeatability and reliability of human eye in visual shade selection

Özat¹,

Tuncel

Eroğlu

2013

J of Oral Rehabilitation

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show abstract

“…On the other hand, there has been considerable debate over the relative importance of spatial versus feature-based visual attention [8][9]. However, Previous investigations were based on experiments that were conducted using a CRT monitor controlled by a personal computer generating MPEG digital video clips of road scenes [10][11][12][13], or employed driving simulation displays depicting a roadway scene in traffic environment [14], or a projection screen connected to the computer through a projector [15], or a vehicle with camera in a real road traffic environment. So far, we have not yet entirely determined the visual attentional allocation of top-down and bottom-up cues in three-dimensional space.…”

Section: Introductionmentioning

confidence: 99%

Visional Attentional Allocation of Top-down and Bottom-up Cues in Three-Dimensional Space

Xia

2011

AMR

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The aim of the present experiment was to investigate visual attentional allocation of top-down and bottom-up cues in three-dimensional (3D) space. Near and far stimuli were used by a 3D attention measurement apparatus. Two experiments were conducted in order to examine top-down and bottom-up controls of visual attention. In the experiment 1, the cue about the location of a target by means of location information. In the experiment 2, color cue by brief change of color at target locations was presented. Observers were required to judge whether the target presented nearer than fixation point or further than it. The results in experiment 1 and experiment 2 show that both location and color cue have the effect on reaction time, and that shift of attention were faster from far to near than the reverse. These findings suggest that (1) attention in 3D space might be operated with both location and color controls included the depth information, (2) the shift of visual attention in 3D space has an asymmetric characteristic in depth.

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“…However, the characteristics of visual attention and depth perception of drivers remained unclear, only a few studies addressed the effect of the environmental illuminance in car exterior and the instruments in car interior on the visual attention of drivers. Previous investigations were based on experiments that were conducted in CRT monitor controlled by a PC generated MPEG digital video clips of road scenes [1,2], or employed driving simulation displays depicting a roadway scene in traffic environment [3], or projection screen connected to the computer through a projector [4], or vehicle with camera in real road traffic environment [5]. The environmental illuminance in car exterior can be divided into three categories: The bright, twilight and dawn.…”

Section: Introductionmentioning

confidence: 99%

Development of Visual Attention Measurement System of Simulated Traffic Environment

Xia

Fan

Zhan

et al. 2011

AMM

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This paper introduces the designs on visual attention measurement system based on the visual attention theory. The measurement system simulated the traffic environment and driving conditions, to examine the reaction time and accuracy of judge response of drivers. It applies to research the top-down and bottom-up controls of visual attention in three-dimensional (3D) space. It included the setting of observation location, stimuli location, moving speed, environmental illuminance and the design of software control interface. The paper describe how the stimuli can be presented by the control system and introduce the design of variable periphery environmental illuminance and obversion targets for detect tasks in detail. The results are demonstrated that this measurement system can be used to examine the reaction time and accuracy of judgment response in three environmental illuminance conditions.

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Effects of surrounding brightness on visual search for safety colors

Cited by 14 publications

References 13 publications

Repeatability and reliability of human eye in visual shade selection

Repeatability and reliability of human eye in visual shade selection

Visional Attentional Allocation of Top-down and Bottom-up Cues in Three-Dimensional Space

Development of Visual Attention Measurement System of Simulated Traffic Environment

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