将景物视为具有灰阶的黑白画面,然后将其亮度高于或低于一定灰度值的部分用电路定义为0,而将其余部分用电路定义为1,由此将彩色景物转换为仅由黑白两种颜色表示的“木刻画”,再将此“木刻画”中的两种颜色中的一种用振动的像素表示出来供盲人触摸.盲人靠触摸这种“木刻画”可一定程度地实时辨知景物.此辨知仪稍加改造还能辨别彩色景物.%Regard the scene as grey-scaled picture, define the areas of the picture where the brightness are either higher or lower than the threshold as electrical 0, and define the other areas of the picture as electrical 1, thus the scene is converted into the "woodcuf'picture which possesses only black and white colors. Then the black or white color is displayed with the vibrating pixels. By touching such kind of "woodcut" picture the blind can recognize the scene in some degree. The modified style can even recognize the scene in colors.
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