Instruction manual

Description of the data path
MARLIN Technical Manua
l
Page 41
It is important to notice that pixel signals above the dual slope reset level will not be influenced
at all (green P1 and green P2).
The Marlin F131 offers two knee-points when in rolling shutter mode, and up to three knee-
points when in global shutter mode. This functionality is basically controlled via the following
registers.
Offset Name Field Bit Description
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] Number of knee-points
possible in this mode
--- [24..27]
KneePoints [28..31] Number of active knee-
points
0xF1000284 KNEEPOINT_1 --- [0..15]
0xF1000284 Kneepoint1 [16..31] Time in µs
0xF1000288 KNEEPOINT_2 --- [0..15]
0xF1000288 Kneepoint2 [16..31] Time in µs
0xF100028C KNEEPOINT_3 --- [0..15]
0xF100028C Kneepoint3 [16..31] Time in µs
Table 25: 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.
Example:
Adjust image so that the dark areas are well displayed. Calculate the used shutter time. Activate
HDR-Mode.
Assuming shutter time to be 40 ms = 40,000 µs:
 Kneepoint_1 = 10 % * 40,000 µs = 4,000 µs = 0xFA0
 Kneepoint_2 = 5 % * 40,000 µs = 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