CMV300 datasheet(30/56 Pages) AMSOSRAM

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Reference:CMV300-datasheet-v2.11

CMV300 Datasheet

Page 28 of 54

Color/mono

Default value

Description of the value

Color

39[0]

0: color sensor is used

1: monochrome sensor is used

5.2.2 PIECEWISE LINEAR RESPONSE

The CMV300 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 in the figure below.

Vhigh

Vtfl2

Vtfl3

Vlow

Total exposure time

Exp_kp1

Exp_kp2

Pixel reset

Pixel sample

FIGURE 32: 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 Vtfl voltages and

different exposure times are programmable using the sequencer registers. Using this feature, a response as detailed in

the figure below can be achieved. The placement of the kneepoints in X is controlled by the Vtfl programming, while

the slope of the segments is controlled by the programmed exposure times.

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