Parallel and shared parallel analog-to-digital conversion for digital imaging
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United States of America Patent
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May 6, 2003
Grant Date -
N/A
app pub date -
Feb 12, 2002
filing date -
Feb 12, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A machine used for acquisition of digital images. A counter tracks the elapsed time since the beginning of image acquisition. When an analog sensor output changes by a pre-set amount, the count is stored as the digital number value representing the sensor output. This eliminates the need for a traditional analog-to-digital (A/D) conversion of the sensor output. In an array of sensors, the circuitry of the invention is simple enough to enable massively parallel A/D conversion. The invention can be implemented in an array using a separate counter for each sensor, but it is also possible to reduce costs by sharing counters among the sensors.
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