Abstract
In-service safety signs can be damaged beyond the point of usefulness due to natural degradation. This study investigated recognition threshold for discolored safety signs in terms of white pixel concentration and CIELUV color difference. Fifteen safety signs were chosen for study and discoloration was simulated with bandpass filters (Photoshop CS® software). Fifty Hong Kong Chinese familiarized themselves with all the sign referents first, and then the signs were presented in random order with each sign shown progressively from the most deteriorated to the complete version in the recognition task. It was revealed that deteriorated safety signs with white pixel concentration difference and CIELUV color difference higher than the grand mean recognition threshold of 19.34 and 4.30, respectively, might not be accurately recognized and should be restored for use immediately. The lifespan of a safety sign in future could be determined through consideration of the estimated prescribed level of recognition threshold for damaged signs. © 2014 Taylor & Francis Group, London.
| Original language | English |
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| Title of host publication | IAENG Transactions on Engineering Sciences - Special Issue of the International MultiConference of Engineers and Computer Scientists, IMECS 2013 and World Congress on Engineering, WCE 2013 |
| Publisher | shers |
| Pages | 295-300 |
| Publication status | Published - 2014 |
| Event | International MultiConference of Engineers and Computer Scientists (IMECS 2013) and World Congress on Engineering (WCE 2013) - London, United Kingdom Duration: 3 Jul 2013 → 5 Jul 2013 http://www.iaeng.org/publication/IMECS2013/ https://dl.acm.org/doi/book/10.5555/2655259 |
Conference
| Conference | International MultiConference of Engineers and Computer Scientists (IMECS 2013) and World Congress on Engineering (WCE 2013) |
|---|---|
| Country/Territory | United Kingdom |
| City | London |
| Period | 3/07/13 → 5/07/13 |
| Internet address |