基于canny算子的新型盲用图形生成技术

New Blind Graphic Printing Technology Based on Canny Operator

随着信息技术的发展,盲用图形对于盲人而言,变得越来越重要。新型盲文打印机作为盲文印刷的新型工具,它克服了传统盲文印刷的许多缺点,但是,目前该盲文打印机还不具备打印盲文图形的功能,为了完善新型盲文打印机,本文针对待打印的盲文图像的特点,采用循环迭代的方式,选择不同阈值的Canny算子对待打印图像进行边缘提取,并对所得到的一系列的边缘图像进行迭代计算,从而实现了待打印图像边缘特征的精确提取。待打印图像的边缘信息最终被转化为新型盲文打印机的控制信息控制新型盲文打印机完成打印,生成盲用图形,从而实现了新型盲文打印机图形打印功能。目前,该方法已经在新型盲文打印机试验,成功的实现了待打印图像在A4纸张上的清晰完整的打印。

Nowadays,Graphic printing becomes more and more important for the blind.As a new Braille printing tool,New Braille Printer（NBP） has overcome many shortcomings of traditional Braille printer.But,till now,the NBP could＇t has the functin of graphic printing.In order to improve the new Braille printer,a blind graphic printing method has been proposed.Considering the characteristics of the printing image,it utilized loop iteration method to select Canny operators with different thresholds,and then,took edge detection on the printing image to gained a series of edge images with the selected Canny operators.The accurate shape information of printing image was translated into NBP＇s control information,then the control information was used to control the NBP to print the blind graphic which gained from iterative calculation of this edge images.This method has been test on NBP,and blind graphics were printed on A4 paper clearly and completely.