Method of enhancing the signal-to-noise within the pixel...

G - Physics – 06 – K

Patent

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G06K 9/60 (2006.01) G06K 9/20 (2006.01) G06K 9/34 (2006.01)

Patent

CA 2231265

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.

L'invention est une feuille de saisie 12C pour systèmes de distribution de documents 10 qui porte des symboles d'entrée introduits à la main par l'utilisateur dans des grilles préexistantes 12. Ces grilles peuvent être imprimées en dégradé ou en demi-teinte. L'impression ne recouvre que partiellement le support sous-jacent, ce qui permet à celui-ci de réfléchir la lumière. Les grilles contiennent suffisamment de pigment pour être visibles par l'utilisateur, mais trop peu pour former des pixels d'avant-plan avec les traits manuscrits quand elles sont détectées au cours du balayage. On augmente le rapport signal (symbole) sur bruit (support) en réduisant la teneur en pigment des grilles, ce qui accroît la réflectivité de ces dernières. On peut l'augmenter encore plus en superposant aux grilles les traits des symboles manuscrits, ce qui occulte une partie du pigment des grilles. On peut l'augmenter davantage en utilisant des agents d'azurage optique à grande réflectivité dans l'impression des grilles et en agissant sur l'ouverture au cours du balayage.

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