Method and apparatus for companding pixel data in a digital pixel sensor
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United States of America Patent
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N/A
Issued Date -
Oct 3, 2002
app pub date -
Mar 30, 2001
filing date -
Mar 30, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An image sensor includes a sensor array, a companding circuit and a data memory. The sensor array includes a two-dimensional array of pixel elements and outputs digital signals as k-bit pixel data representing an image of a scene. The companding circuit is operable to compand the k-bit pixel data into h bits, h being less than k. The data memory is in communication with the sensor array for storing the h-bit pixel data for each of the pixel elements. In one embodiment, the companding circuit applies a transfer function which is linear for low intensity values and logarithm for high intensity values.
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