Skew processing of raster scan images

G - Physics – 06 – K

Patent

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G06K 9/60 (2006.01) G06K 7/14 (2006.01)

Patent

CA 2344357

Run length encoded data derived from a raster scanner (30) at an arbitrary angle to the horizontal direction of a rectilinear symbol (25) such as a two-dimensional PDF code is examined to detect the skew angle between the horizontal direction (Xs) of the symbol (25) and horizontal direction (Xr1) of the raster (36). Using the detected skew angle, a computer (70) generates a set of virtual scan lines overlaid on the real scan lines. The computer (70) partitions the virtual scan lines and the real scan lines into associated real and virtual line segments having common intersection points. The locations of mark to space or space to mark transitions are mapped from the real line segments onto the virtual line segments. The system can handle run length encoded data with low computational overhead.

L'invention concerne des données codées en longueur de trame (RLE), dérivées d'un scanner à trame (30) au niveau d'un angle arbitraire par rapport au sens horizontal d'un symbole rectiligne (25)tel qu'un code PDF à deux dimensions. On examine ces données pour détecter l'angle d'obliquité entre le sens horizontal (Xs) du symbole (25) et le sens horizontal (Xrl) de la trame (36). D'après l'angle d'obliquité détecté, un ordinateur (70) génère une série de lignes virtuelles de balayage superposées aux lignes réelles de balayage. L'ordinateur (70) divise les lignes virtuelles de balayage et les lignes réelles de balayage en segments de lignes réelles et virtuelles associées, possédant des points d'intersection communs. Les emplacements des transitions marque/espace ou espace/marque sont repris des segments de lignes réelles sur les segments de lignes virtuelles. Ce système permet de traiter des données codées RLE avec une faible surcharge système.

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