Research on Cylinder Data Matrix Barcode Recognition

He, Weiping; Lin, Qingyu; Wang, Wei; Cao, Xizheng; Guo, Gai-fang

doi:10.1016/j.aasri.2012.11.051

Cited by 2 publications

(1 citation statement)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A data matrix format was adopted as the code-mark type because it is widely used for quality control. [23][24][25][26][27][28][29] The projected code-mark size was approximately 1 × 1 mm 2 , and the element cell size was 100 × 100 µm 2 because the projection ratio was 1=10 and the mark sizes were reduced by a factor of 10 through the projection lens. The numerical aperture of the lens was 0.4.…”

Section: Projection Printing Of Two-dimensional Code Marksmentioning

confidence: 99%

Readability dependence on lithography conditions for printing code marks using a squared optical fiber matrix and light-emitting diodes

Watanabe¹,

Kato²,

Iwasaki³

et al. 2015

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

The direct readability of code marks printed using a new exposure system was investigated. In the new exposure system, code-mark patterns were printed using LEDs as exposure sources and squared optical-fiber ends as code-mark elements. A 10 ' 10 fiber matrix was fabricated, and light emitted from each LED was led to each fiber. Because gaps appeared between the code-mark cells, a long exposure time was adopted, and the gaps between cells were eliminated by giving an overdose of light. After code-mark patterns were stably printed, their readability was investigated using a commercial code-mark reader. It was found that all the printed code marks were readable without errors. In concrete, same 100 identical marks printed on a wafer were readable. Moreover, six kinds of marks were repeatedly detected more than 100 times with no reading errors.

show abstract