CMV20000 datasheet(44/69 Pages) AMSOSRAM

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CMV20000

Functional description

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DS000440 • v3-00 • 2026-Mar-13

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7.4.3

High dynamic range modes

7.4.3.1

Piecewise linear response

The device has the possibility to achieve a high optical dynamic range by using a piecewise

linear response. This feature will clip illuminated pixels which reach a programmable voltage,

while leaving the darker pixels untouched. The clipping level can be adjusted 2 times within

one exposure time to achieve a maximum of 3 slopes in the response curve. More details can

be found on Figure 27.

Figure 27: Piecewise linear response details

In the figure above, the red lines represent a pixel on which a large amount of light is falling.

The blue line represents a pixel on which less light is falling. As shown in the figure, the bright

pixel is held to a programmable voltage for a programmable time during the exposure time.

This happens two times to make sure that at the end of the exposure time the pixel is not

saturated. The darker pixel is not influenced and will have a normal response. The Vlevel_s2/3

voltages and different exposure times are programmable using the sequencer registers. Using

this feature, a response as detailed in Figure 28 can be achieved. The placement of the

kneepoints in X is controlled by the Vlevel_s2/3 programming, while the slope of the segments

is controlled by the programmed exposure times.

Vhigh

Vlevel_s2

Vlevel_s3

Vlow

Total exposure time

Exp_s2

Exp_s3

Pixel reset

Pixel sample

CMV20000 Datasheet(PDF) 44 Page - ams-OSRAM AG