Signal processing apparatus for a photographic film scanner

Details Signal processing apparatus for a photographic film scanner Signal processing apparatus for a photographic film scanner

1994-09-09

1996-06-11

Greening, Wendy R.

Television

Special applications

Film, disc or card scanning

348 96, H04N 336, H04N 5253, H04N 911, H04N 947

Patent

active

055260403

ABSTRACT:
In a digital film scanner, invalid image pixel data is identified by a logic circuit which responds jointly to an over range signal from the scanner analog to digital converter and the most significant bit of the pixel data. The logic circuit discriminates between input pixel analog voltages representing valid maximum or minimum pixel data values and values which are outside the conversion range of the A/D converter which correspond to invalid pixel data. An image processing computer selectively responds to these indications to substitute nearby valid pixel data for calculation and to provide appropriate operator warnings or even system shutdown depending on the number of successive invalid pixel data occurrences.

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