Image analysis – Image sensing – Multiple scanning
Patent
1997-09-08
2000-11-07
Couso, Jose L.
Image analysis
Image sensing
Multiple scanning
382312, 382284, G06K 900, G06K 700, G06K 920, G06K 936
Patent
active
061447781
ABSTRACT:
A computerized methodology for reducing swath scanner swath boundary discontinuities is provided by using a predetermined overlap of pixel rows during each sequential scan. Pixel data from a first scan of the overlapped pixel rows is compared to the pixel data from a second scan of the overlapped pixel rows, identical pixels of the overlapped pixel rows ideally having the same representative scan data. Errors are compensated by weighting representative scan data for each pixel row, linearly decreasing the weighting in proportion to the proximity to the swath boundary. In one embodiment, the weighting factor is an increase or decrease in the first scan data relative to the percent change in white level intensity captured in the second scan of the overlapped pixel rows. In another embodiment, the weighting factor is a linear shifting of the proportion of the pixel data from the first scan and the pixel data from the second scan of the overlapped pixel rows used as the scanned image data such that the proportion of the first scan decreases as the proportion of the second scan increases, thereby smoothing differentials in data representative of individual pixel rows at swath boundaries. In another embodiment, scanner signal-to-noise ratio is improved by using a weighting factor in accordance with the Central Limit Theorem.
REFERENCES:
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patent: 4999646 (1991-03-01), Trask
patent: 5140432 (1992-08-01), Chan
patent: 5512923 (1996-04-01), Bauman
patent: 5644683 (1997-07-01), Ross et al.
Beauchamp Robert W.
Behrend Curtis J.
Couso Jose L.
Hewlett--Packard Company
Novik Dmitry A.
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