READABILITY OF SCREEN PRINTED QR CODES DEPENDING ON THEIR DIMENSION, ENCODED CONTENT AND TYPE OF PRINTING SUBSTRATE USING SCREEN PRINTING TECHNIQUE

Ž. Pavlović, S. Dedijer, Magdolna Pál, Ivana Tomić, I. Jurič
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Abstract

QR (Quick Response) code is a two-dimensional code consisting of white and black squares as information carriers.The main advantages of a two-dimensional or matrix code is the possibility of various and extensive content in thegiven area, wherein the amount of encoded data is limited to about 7000 numbers and about 1800 symbols. Theabove-mentioned codes have become an inevitable part of any industrial product. The aim of this experiment was totest readability of different QR codes printed with screen printing with different mesh tread densities (140 threads/cmand 180 threads/cm). The QR codes were prepared in six different dimensions (1 cm2, 1.3 cm2, 1.6 cm2, 1.9 cm2, 2.2cm2 and 2.5 cm2) with three different types of content (textual message-SMS with 160 characters, short URL and longURL) on seven different substrates (paper 170g/m2, self-adhesive paper, PVC foil, white and yellow cotton cloth/fabric,aluminium sheet and glass plate). During the experiment D65 light source was used as a simulation of daylight. Wehave used Neo Reader software for QR code reading on HTC Desire phone, using the 5-megapixel camera andpossibility of autofocus. The results show improved readability with QR codes printed with screen mesh of 140threads/cm and with the reduction of carried information, i.e. the number of characters that QR codes consist of. Also,the problem with readability decreases when using substrates such as aluminium sheet or glass plate.
丝网印刷qr码的可读性取决于其尺寸,编码内容和使用丝网印刷技术的印刷基材类型
QR (Quick Response)码是一种由黑白方块组成的二维码,作为信息载体。二维码或矩阵码的主要优点是在给定区域内可以包含多种广泛的内容,其中编码数据的数量被限制在约7000个数字和约1800个符号。上述规范已成为任何工业产品不可避免的一部分。本实验的目的是测试不同网面密度(140螺纹/指令180螺纹/厘米)下丝网印刷的不同二维码的可读性。二维码以6种不同尺寸(1 cm2、1.3 cm2、1.6 cm2、1.9 cm2、2.2cm2和2.5 cm2)和3种不同内容(160个字符的短信、短URL和长URL)在7种不同基材(纸170g/m2、不干胶纸、PVC箔、白色和黄色棉布/织物、铝板和玻璃板)上制作。实验中采用D65光源作为日光模拟光源。我们使用Neo Reader软件在HTC Desire手机上读取二维码,使用500万像素的摄像头和自动对焦的可能性。结果表明,采用140线/cm的丝网印刷二维码,可提高二维码的可读性,同时减少二维码所携带的信息,即二维码所包含的字符数。此外,当使用铝板或玻璃板等基板时,可读性问题也会减少。
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