Maxicode data extraction using spatial domain features exclusive of fourier type domain transfer processing

A method of extracting data from a MaxiCode type of dataform, having a pattern of similarly aligned hexagonal data cells of differing reflectivity values, comprising the steps of:

• (a) providing pixel data for an image area, said pixel data representative of illumination reflected from said hexagonal data cells;
• (b) determining the orientation of a plurality of said hexagonal data cells positioned in a row in side-to-side straight line alignment;
• (c) sampling image data from said plurality of hexagonal data cells along a line traversing each data cell of said plurality;
• and
• (d) extracting data from said image data sampled in step (c) by determining spacings of illumination value transitions between data cell groups along said line, each said data cell group consisting of one or more contiguous data cells of similar reflectivity value.

A method of extracting data from a dataform having a pattern of rows of similarly aligned lighter and darker data cells of a regular polygon shape, comprising the steps of:

• (a) providing pixel data for an image area, said pixel data representative of reflected images of said data cells;
• (b) determining, by moment analysis of a portion of said pixel data, the orientation of a normal traversal line having an alignment normal to sides of a series of said data cells positioned in a row in side-to-side straight line alignment;
• (c) sampling image data from a plurality of said data cells along a sampling line traversing each data cell of said plurality;
• and
• (d) extracting data from said sampled image data.

A method of extracting data from a dataform having a pattern of rows of similarly aligned lighter and darker data cells of a regular polygon shape, comprising the steps of:

• (a) providing pixel data for an image area, said pixel data representative of reflected images of said data cells;
• (b) determining, by the presence of illumination value transitions spaced at integral multiples of data cell width, the orientation of a normal traversal line having an alignment normal to sides of a series of said data cells positioned in a row in side-to-side straight line alignment;
• (c) sampling image data from a plurality of said data cells along a sampling line traversing each data cell of said plurality;
• and
• (d) extracting data from said sampled image data.