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DCx Cameras

Line number

Defines the line to be scanned

For further information see "Basics": Line scan mode .

Log mode

The Log mode is a special mode of the DCC1240x and DCC3240x camera models. It defines the threshold defines

at which the linear sensitivity changes into a logarithmic characteristic.

At very short exposure times (less than 0.1 ms) there may occur e.g. so-called crosstalk effects in the global

shutter mode, which have the effect that the image content appears brighter in the vertical from top to bottom. This

effect can be avoided by the Log mode.

Factory-default with anti-blooming

Recommended setting

Off (no anti-blooming)

At longer exposure times without gain, it may happen that the sensor does not achieved white. This is because of

the sensor automatism to prevent overexposure (blooming). Remedy offers the use of a gain factor of 1.4x or the

mode "Off (no anti-blooming)."

For short exposure times this mode should not be used, otherwise the image (particularly in global shutter mode)

can be extremely overexposed.

Manual Log mode

In this mode it is possible to display the information in the overexposed image areas. This mode is effective for

exposure times below 5 ms.

o LogMode value

Using a slide control with 13 levels you can adjust the threshold at which the linear sensitivity pass over into a

logarithmic characteristic. Here, the value "0" represents the lowest active level and "12" corresponds to the

highest level.

o LogMode gain

When using the manual Log mode no master gain is possible. The gain can be adjusted with the LogMode

gain. The gain can be adjusted in 5 levels. The level "3" corresponds to a gain factor of 1 for monochrome or

color sensors. For the NIR sensor the level "1" corresponds to a gain factor of 1.

Example: A low level results in a low gain and may display more details in the overexposed image areas. A

higher level gives a higher gain, thereby a darker image can be brightened (see also DCC1240x / DCC3240x

Application Notes ).

Default

Click this button to reset all parameters to the model-specific defaults.

THORLABS DCU223x User Manual

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