Abstract
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.