Weighted and unweighted convolution filtering processes are provided for decoding bitmap image space representations of self-clocking glyph shape codes and for tracking the number and locations of the ambiquities or "errors" that are encountered during the decoding. This error detection may be linked...http://www.google.com.au/patents/US5091966?utm_source=gb-gplus-sharePatent US5091966 - Adaptive scaling for decoding spatially periodic self-clocking glyph shape codes
