1
Ynjiun P Wang: Locating 2-D bar codes. Metamedia Corporation, Kenneth P Robinson, April 19, 1994: US05304787 (246 worldwide citation)

After a two-dimensional bar code is scanned to provide a stored image, the location (i.e., bounds, including orientation) of the bar code image within the scanned area image must be determined to enable decoding. Methods for locating the bar code image include the steps of sampling the stored image, ...


2
Ynjiun P Wang: 2-D bar code scanner/decoder having a redundancy canceller. Metamedia Corporation, K P Robinson, December 19, 1995: US05477042 (164 worldwide citation)

Hand-held devices are provided for both scanning and decoding coded images such as two-dimensional bar codes. A linear scanning array of image sensing elements in the scanner/decoder provides image data with pixel-to-pixel synchronism, but lacking scan-to-scan synchronism as the scanning array is mo ...