Instruction manual

Marlin Technical ManualV.2.7.0

Description of the data path

This introduces a knee-point in the exposure function.

If the dual slope reset pulse is placed at the end of the integration time (90% for

instance), the analogue signal which would have normally reached the satura-

tion level is no longer saturated at read out. This effect increases the optical

dynamic range of the sensor.

It is important to notice that pixel signals above the dual slope reset level will

be left unaffected (green P1 and green P2).

Marlin F-131 with three knee-points

The Marlin F-131 offers up to three knee-points when in global shutter mode.

This functionality is controlled via the following registers.

0xF1000280 HDR_CONTROL Presence_Inq [0] Indicates presence of this

feature (read only)

--- [1..5] Reserved

ON_OFF [6] Enable/disable HDR mode

--- [7..19] Reserved

MaxKneePoints [20..23] R: Number of knee-points

possible in this mode

--- [24..27] Reserved

KneePoints [28..31] W: Number of active knee-

points

0xF1000284 KNEEPOINT_1 --- [0..15] Reserved

Kneepoint1 [16..31] R/W: Time in μs

0xF1000288 KNEEPOINT_2 --- [0..15] Reserved

Kneepoint2 [16..31] R/W: Time in μs

0xF100028C KNEEPOINT_3 --- [0..15] Reserved

Kneepoint3 [16..31] R/W: Time in μs

Table 26: High dynamic range configuration register

Note



It is recommended that knee-points be adjusted to 10 %, 5 %

and 2.5 % of the total exposure or shutter time being applied

at the end of the exposure.