1 February 1991 Optical correlation filters to locate destination address blocks in OCR
Author Affiliations +
Proceedings Volume 1384, High-Speed Inspection Architectures, Barcoding, and Character Recognition; (1991); doi: 10.1117/12.25336
Event: Advances in Intelligent Robotics Systems, 1990, Boston, MA, United States
Abstract
A wide variety of optical distortion-invariant correlation filters for possible use in United States Postal Service (USPS) destination address block location and reading are summarized. These filters allow the entire envelope to be processed in parallel and are selected in a hierarchy using symbolic encoding to locate (and read) key words on an envelope. With contextual data they can locate the address block the lines and key words in each and read these words at high rates with excellent P (percentage correct recognition) and Pe (percentage error).
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David P. Casasent, Gopalan Ravichandran, "Optical correlation filters to locate destination address blocks in OCR", Proc. SPIE 1384, High-Speed Inspection Architectures, Barcoding, and Character Recognition, (1 February 1991); doi: 10.1117/12.25336; https://doi.org/10.1117/12.25336
PROCEEDINGS
11 PAGES


SHARE
KEYWORDS
Image filtering

Detection and tracking algorithms

Optical character recognition

Optical filters

Gaussian filters

Inspection

Fourier transforms

RELATED CONTENT

Sending image information to its Fourier phase and its use...
Proceedings of SPIE (November 14 1996)
Initial key word OCR filter results
Proceedings of SPIE (February 01 1991)
Advanced in-plane rotation-invariant filter results
Proceedings of SPIE (December 01 1991)

Back to Top