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Reading Performance Improvement in PDF-417 2-dimensional Bar code
안라연,박지후,우홍체 대구대학교 2006 대구대학교 학술논문집 Vol.1 No.2
As life style becomes to be complicated, lots of supportive technologies were developed. The bar code technology is one of them. It was renovating approach to merchandise industry. However, data storage ability of one dimensional bar code is limited because of growing the number of merchandise.. Two-dimensional bar code was proposed to overcome one-dimension bar code. PDF-417 bar code most commonly used in standard two-dimension bar codes has good performance at data decoding and error correction area. An algorithm to improve reading performance with PDF-417 is suggested. The threshold value is computed, and bar and space are extracted according to threshold value. PDF-417 is used everyday and is printed in many different materials. The printed PDF-417 is especially influenced by various light sources. It is hard to recognize the bar and space separation under the circumstance of changing illumination. The fixed threshold value to distinguish the bar and space can not be applied. The proposed algorithm is developed to investigate the variable threshold. The variable threshold can be obtained by simple calculation.