252 CONTENTS
Figure 3: Measured curves
The curves are at Gain 1, lambda = 670 nm (40 nm width), room temperature, nominal power supply values, on a
100 x 100 pixel cantered area.
"mv Linear Logarithmic Mode" value Dynamic max (dB)
T = 2 ms T = 20 ms
4 47 65
5 74 93
6 85 104
7 92 111
20.6.3 Adjusting sensor -1031C
20.6.3.1 Introduction
The AR0331 Aptina sensor supports two dynamic modes:
• linear dynamic mode which is activated by default.
This mode uses two interleaved rest-exposure pointers to create a 16 bit linear dynamic range. The first
twelve bits are used for the long exposure (T1) while the remaining four bits are used for the short exposure
(T2 = T1 / Ratio). With wxPropView (p. 90) you can shift through the bits.
• high dynamic mode (HDR) which compresses the 16 bit value to 12 bits using Adaptive Local Tone Mapping
(ALTM) or by companding to 12 or 14 bits (figure 1).
MATRIX VISION GmbH
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