Instruction manual

Description of the data path

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

The Marlin F131 offers up to three knee-points when in global shutter mode. This functionality is

controlled via the following registers.

(green P1 and green P2).

0xF1000280 HDR_CONTROL Presence_Inq [0] Indicates presence of this

feature (read only)

--- [1..5]

ON_OFF [6] Enable/disable HDR mode

--- [7..19]

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

possible in this mode

--- [24..27]

KneePoints [28..31 : Nu tive knee-

point

] W mber of ac

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

0xF1000284 Kneepoint1 [16..31] R/W: Time in µs

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

0xF1000288 Kneepoint2 [16..31] R/W: Time in µs

0xF100028C K EEPOINT_3 --- ..15 N [0 ]

0xF100028C Kneepoint3 [16..31] R/W: Time in µs

Table 29: High dynamic range configuration register

 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.

just image so th t the dark areas are well dis ulat shutter time. Activate

DR-Mode.

Assuming shutter time to be 40 ms

s = 2,000 µs = 0x7D0

 Kneepoint_3 = 2.5 % * 40,000 µs = 1,000 µs = 0x3E8

The following needs to be written:

HDR_CONTROL: (Adress: 0xF1000280) 0x02000003

KNEEPOINT_1: (Adress: 0xF1000284) 0x00000FA0

KNEEPOINT_2: (Adress: 0xF1000288) 0x000007D0

KNEEPOINT_3: (Adress: 0xF100028C) 0x000003E8

r further tuning, readjust KNEEPOINT_X but maintain ratio KNEEPOINT_1 > KNEEPOINT_2 >

Example:

Ad a played. Calc e the used

= 40,000 µs:

 Kneepoint_1 = 10 % * 40,000 µs = 4,000 µs = 0xFA0

 Kneepoint_2 = 5 % * 40,000 µ

KNEEPOINT_3.

MARLIN Technical Manua

Page 55