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A method is described for determining pixel intensity from a binary output sensor array.
English (United States)
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Gray Scale Imaging With Dram Optical Sensors
A method is described for determining pixel intensity from a binary output
A dynamic random access memory (DRAM) stores information in an array of
memory cells, each composed of an integral capacitor and transistor. Binary
information is stored in a cell through the presence or absence of charge on the
capacitor. A charged capacitor, however, rapidly discharges due to leakage
factors, and conventional DRAM applications must provide periodic refresh of
DRAM contents. This refresh is done by reading the cell's contents before it has
a chance of discharging below a set threshold, then immediately writing the cell
to restore it to full charge. If light is incident on the cell, leakage is increased. An
optical DRAM sensor uses this phenomena to detect the presence or absence of
light, and provides the capability of sensing an image due to the geometric
regularity of the cell layout. Since only the discharge of a cell below a fixed
threshold is reported, the resultant output of the sensor is binary with a "1" being
reported if the incident light has not discharged the cell below the threshold and a
"O" being reported if it has.
The intensity of incident light may be determined in at least two ways - 1)
using a fixed exposure time, vary the threshold on multiple exposures and
compute the intensity for each cell from the threshold value at which the cell
changed state when read, or 2) using a constant threshold,...