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Methods to Address Headlight Glare
| 题名： | Methods to Address Headlight Glare |
| 作者： | Greenhouse, D. |
| 关键词： | Glare control##Headlight glare##Glare discomfort evaluation##Image processing##Simulation##Veiling luminance##Disability glare##Photometers (Applications)##Discomfort glare##Glare meter tool## |
| 摘要： | The Visual Detection Laboratory at UC Berkeley has developed an objective glare measurement device with which we can measure the disability glare and discomfort glare levels that will be experienced by a driver in nighttime driving. This Glare Meter Tool is based on images acquired by a full-color video photometer. Two separate computer programs, one for disability glare and one for discomfort glare analyzed the images. The general consensus among researchers is that disability glare is the more important factor in traffic safety, since task performance (i.e. driving) can be directly affected, while pure discomfort glare results only in annoyance to the driver. Many glare sources, including headlights from an opposing vehicle, will result in both kinds of glare. Under this research, a Glare Meter Tool was tested and validated in a series of laboratory experiments in which observers performed an increment threshold task. Observers performed various tasks with and without the presence of glare, which was introduced by use of a high-intensity white LED placed in front of the computer screen. Experiments were performed for observers over a wide range of ages. The results showed that the equivalent veiling luminance predicted by the Glare Meter Tool was in agreement with the experimentally determined number. A Glare Meter Tool that can acquire an image of a scene in which glare is present and estimate the equivalent veiling luminance of disability glare and the severity of discomfort glare was successfully developed. However, while the Glare Meter Tool functions well in principle, the prototype has proven impractical in the field. The result is that the Glare Meter Tool, at its present stage of development, can only be used for static scenes, and requires a labor-intensive and timeconsuming amount of image processing, thus limiting its utility. In summary, we have developed a Glare Meter Tool and tested it in a series of laboratory and field experiments. We have found it to be highly accurate, both for predicting the equivalent veiling luminance due to disability glare (verified by a psychophysical threshold contrast task) and the De Boer rating of discomfort glare (verified by comparing the prediction of the instrument with the subjective ratings by human observers). The Glare Meter Tool at its current stage of development is useful as a laboratory device but impractical for most fieldwork. |
| 总页数： | 173 |
| 报告类型： | 科技报告 |
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