以柵條狀浮凸標記作為盲人鈔券主要面額辨識特徵之研究

A study of using relief grating marks as key coding feature on banknotes for the blind

莊彥騏(Chuang, Yen Chi)

指導教授 ： 游志雲

國立清華大學/工學院/工業工程與工程管理學系/碩士(2015年)

https://doi.org/10.6843/NTHU.2015.00145

摘要

本研究在於探討以柵條狀浮凸標記做為盲人鈔券主要面額辨識特徵的可行性。先進國家都努力試著發行可供盲人辨識的鈔券，經過數十年的努力目前還沒有達到有效可靠的階段，故本研究意想探索一套有效可靠的盲人鈔券辨識方法。
本研究的目的在於找出盲人可以有效絕對辨識的二階柵條狀浮凸標記。實驗的方法是請盲人在測試用紙上的49個(7 x 7)不同的標記上以指腹觸摸指認。指認的方法首先是在測試用紙上確認可以感知柵條標記的區域，接著在這個區域中找出二個可以絕對辨識的標記。這個測試用紙上的49個標記排列成7 x 7的矩陣，最左上角(1，1)為0.2mm筆劃粗細，1：1的筆劃粗細與間距比例，向右每行筆劃粗細與間距比例以25%的增幅提高，向下每列筆劃粗細以25%的增幅提高，所以最右下的(7，7)的尺寸為0.76mm筆劃粗細，1：3.81的筆劃粗細與間距比例。本研究的被測試者為20位全盲與30位明眼人。
盲人的可感知範圍實驗結果為測試紙右下方的4 x 4矩陣區域。明眼人也完全相同。在這個範圍內，盲人可以絕對辨識的二階柵條標記為(4，4)與(7，7)，(4，4)為粗度0.39mm/間距0.76mm，(7，7)為粗度0.76mm/間距2.91mm，指認正確率為100%，判斷時間為1.78秒。明眼人的結果幾乎完全相同，正確率也是100%，唯判斷時間略長，2.00秒。
這個實驗的結果非常令人興奮，這二階的浮凸柵條標記如果佐以兩個顯示編碼，例如標記數目與標記的方向，則我們應該足以設計多達12種面額的盲人鈔券，應可以滿足目前各國的鈔券的面額數量。

關鍵字

鈔券辨識 ； 編碼系統 ； 鈔券辨識準確度

並列摘要

The purpose of this study is to investigate the feasibility of using relief grating marks as key coding feature on banknotes for the blind. Advanced countries are trying to try to issue banknotes for the blind identification, after decades of effort has not yet reached the stage of effective and reliable, so this study to explore an effective and reliable method to identify banknotes for the blind.
The purpose of this study is to find the blind can absolutely identify effective two level relief grating marks. Experimental approach is to ask the blind in the test paper 49(7 x 7) different marks to identify pulp touch. Identifying the method first used in the test paper to confirm the marked area can be perceived, then find the two can definitely identify markers in this area. This test paper with 49 markers arranged in a matrix of 7 x 7, the upper left corner (1,1) stroke width of 0.2mm, 1:1 stroke width and spacing ratio, each row to the right stroke width and spacing ratio to 25% of an increase, each column to the down stroke width 25% of an increase, so the lower right (7,7) stroke width of 0.76mm , 1: 3.81 ratio of stroke width and spacing. This study was testers to 20 blind and 30 normal vision people.
Blind perceived area results for the 4 x 4 matrix bottom right area of the test paper. Normal vision people also identical. In this area, the blind can absolutely identify of two level-relief grating marks is (4,4) and (7,7), (4,4) for the stroke width of 0.39mm / spacing of 0.76mm, (7,7) for the stroke width of 0.76mm / spacing of 2.91mm, To identify the correct rate of 100%, judgment time of 1.78 seconds. Results normal vision people almost identical, the correct rate is 100%, only slightly longer of judge, is 2.00 seconds.
The results of this experiment are very exciting, this two level relief grating marks if accompanied by two coding, such as the number of marks and direction of marks, then we should be sufficient to design up to 12 denominations of banknotes blind, The number of countries meet the current denominations of banknotes.

並列關鍵字

Identification of banknotes ； Coding System ； Banknotes recognition accuracy

參考文獻

[3]蔡宗澤。2014。以金屬薄膜觸感作為盲人鈔券辨識編碼之研究。

[5]Context effects in haptic perception of roughness, 21 January 2009

[6]World health organization, ‘Visual impairment and blindness’,http://www.who.int/mediacentre/factsheets/fs282/en/

[7]World health organization, ‘Causes of blindness and visual impairment’, http://www.who.int/blindness/causes/en/

[8]‘Currency features for visually impaired people’ National Research Council, Publication NMAB-478 National Academy Press, Washington DC, 1995.