Method of enhancing the signal-to-noise within the pixel image o

Details Method of enhancing the signal-to-noise within the pixel image o Method of enhancing the signal-to-noise within the pixel image o

1997-03-06

1999-06-15

Shalwala, Bipin

Image analysis

Image sensing

Sensor control

382177, 382179, 382181, 382182, 382187, 382202, 382312, G06K 920, G06K 934, G06K 946, H04N 100

Patent

active

059129964

ABSTRACT:
An input carrier sheet 12C for document distribution system 10 carries input symbols hand entered by the user into pre-existing constraint grids 12. The constraint grids may be printed in continuous tone or halftone. The print only partially covers the underlying carrier, permitting the exposed carrier to reflect light. The grids have sufficient pigment to be visible to the user, but insufficient pigment to form foreground pixels along with the hand-entered stroke when detected during the scanning. The signal (symbol)-to-noise (carrier) ratio is enhanced by reducing the pigment content of the constraint grids which increases the reflectivity of the grids. The S/N may be further enhanced by placing the strokes of the hand-entered symbols on top of the grid which occults some of the grid pigment. The S/N is further enhanced by highly reflective brightening agents in the grid print, and by aperture effect during scanning.

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