Security Filtering of Medical Images using OCR
James Z. Wang
The Pennsylvania State University
Abstract:
Before digital medical images in computer-based patient record systems
can be distributed online, it is necessary for confidentiality reasons
to eliminate patient identification information that appears in the
images. We present an automatic security filtering algorithm for
on-line medical image distribution using Daubechies' wavelets
and Optical Character Recognition (OCR). The system is practical for
real-world applications, processing and coding each 12-bit image of
size 512 x 512 within 2 seconds on a Pentium Pro. Besides its
exceptional speed, the security filter has demonstrated high accuracy
in detecting sensitive textual information within current or digitized
previous medical images. The algorithm is of linear run time.
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Last Modified:
April 8, 2002
© 2002, James Z. Wang