Binary image processing for decoding self-clocking glyph...

G - Physics – 06 – K

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G06K 9/64 (2006.01) G06K 7/016 (2006.01) G06K 9/18 (2006.01) G06K 19/06 (2006.01)

Patent

CA 2044463

Binary image processing techniques are provided for decoding bitmap image space representations of self-clocking glyph shape codes of various types (e.g., codes presented as original or degraded images, with one or a plurality of bits encoded in each glyph, while preserving the discriminability of glyphs that encode different bit values) and for tracking the number and locations of the ambiguities (sometimes referred to herein as "errors") that are encountered during the decoding of such codes. A substantial portion of the image processing that is performed in the illustrated embodiment of this invention is carried out through the use of morphological filtering operations because of the parallelism that is offered by such operations. Moreover, the error detection that is performed in accordance with this invention may be linked to or compared against the error statistics from one or more alternative decoding process, such as the convolution filtering process that is disclosed herein, to increase the reliability of the decoding that is obtained.

Techniques de traitement d'image binaire permettant de décoder des représentations spatiales image-point de codes de glyphes à auto-synchronisation de divers types (p. ex. codes présentés comme images originales ou dégradées, comportant un ou plusieurs bits codés dans chaque glyphe, tout en préservant la discriminabilité des glyphes qui codent différentes valeurs binaires) et pour dénombrer et localiser les ambiguïtés rencontrées au décodage de ces codes. Une partie importante du traitement d'image exécuté dans la version illustrée de la présente invention s'effectue au moyen d'opérations de filtrage morphologique étant donné le parallélisme que présentent ces opérations. En outre, la détection d'erreurs effectuée conformément à la présente invention peut être liée ou comparée aux erreurs statistiques provenant d'un ou de plusieurs processus de décodage, tels que le processus de filtrage de convolution présenté ici, afin d'accroître la fiabilité du décodage obtenu.

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