Moon Sung Park, Jae Gwan Song, Yun Seok Nam, Hye Kyu Kim, Hoe Kyung Jung

The Transactions of the Korea Information Processing Society (1994 ~ 2000), Vol. 7, No. 7, pp. 2149-2160, Jul. 2000
10.3745/KIPSTE.2000.7.7.2149,   PDF Download:

Abstract

Recently many efforts on the development of automatic processing system for delivery sequence sorting have been performed in ETRI, which requires the use of postal 4-state bar code system to encode delivery points. The 4-state bar code called postal 4-state bar code for high speed processing that has been specifically designed for information processing of logistics and automatic processing of the mail items. The Information of 4-state bar code indicates mail data such as post code, delivery sequence number, error correction code word, customer information, and a unique ID.This paper addresses the issue on the reduction of reading error in postal 4-state raster beam based bar code reader. The raster beam scanning features are the unequally distributed number of spots per each unit, which cause reading errors. We propose a method for reducing the bar code reading error by adjusting measured values of bar code width to its average value over each interval. The test results show that the above method reduces the average reading error rate approximately by 99.88%.

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