| 摘要 |
<p>A dataform reader, configured to reduce effects of image offset causing registration error between sequential fields of image data, comprising:
a sensor array (14) responsive to illumination reflected from a dataform to provide signals representative of illumination levels on first and second groups of sensors respectively representing first and second field images subject to image offset;
a memory (30) coupled to said sensor array to store first field image data representative of said illumination levels on the first group of sensors and to store second field image data representative of said illumination levels on the second group of sensors;
characterised by a processor (40) comprising means for determining the magnitude of at least one disparity vector extending in a direction representative of said image offset, by utilising the image data of said first and second fields, and means utilising said disparity vector magnitude to provide enhanced decoding of said dataform by use of image data of both said first and second fields.
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