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Reference:CMV300-datasheet-v2.11

CMV300 Datasheet

Page 27 of 54

5.2 HIGH DYNAMIC RANGE MODES

The sensor has different ways to achieve high optical dynamic range in the grabbed image.



Interleaved read-out: the odd and even columns have a different exposure time



Piecewise linear response: pixels respond to light with a piecewise linear response curve.

All the HDR modes mentioned above can be used in both the internal- and external-exposure-time mode.

5.2.1 INTERLEAVED READ-OUT

In this HDR mode, the odd and even columns of the image sensors will have a different exposure time. This mode can

be enabled by setting the register in the table below.

HDR settings – interleaved read-out

Default value

Description of the value

Exp_dual

41[1]

0: interleaved exposure mode disabled

1: interleaved exposure mode enabled

The surrounding system can combine the image of the odd columns with the image of the even columns which can

result in a high dynamic range image. In such an image very bright and very dark objects are made visible without

clipping. The table below gives an overview of the registers involved in the interleaved read-out when the internal

exposure mode is selected.

HDR settings – interleaved read-out

Default value

Description of the value

Exp_time

42-44

488

When the Exp_dual register is set to ‘1’, the value in this

according following formula: Exp_time x 325 x clk_per,

where clk_per is the period of the master input clock.

Exp_time2

45-47

488

When the Exp_dual register is set to ‘1’, the value in this

according following formula: Exp_time2 x 325 x clk_per,

where clk_per is the period of the master input clock.

When the external exposure mode and interleaved read-out are selected, the different exposure times are achieved by

using the T_EXP1 and T_EXP2 input pins. T_EXP1 defines the exposure time for the even columns, while T_EXP2 defines

the exposure time for the odd columns. See the figure below for more details.

FRAME_REQ

T_EXP1

T_EXP2

Exposure time even columns

Exposure time odd columns

FIGURE 31: INTERLEAVED READ-OUT IN EXTERNAL EXPOSURE MODE

When a color sensor is used, the sequencer should be programmed to make sure it takes the Bayer pattern into account

when doing interleaved read-out. This can be done by setting the appropriate register to ‘0’.

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