Instruction manual

Marlin Technical ManualV.2.7.0

Description of the data path

Example Adjust image so that the dark areas are well displayed. Calculate the used shut-

ter 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:

For further tuning, readjust KNEEPOINT_X but maintain ratio KNEEPOINT_1 >

KNEEPOINT_2 > KNEEPOINT_3.

The figure below, taken from the sensor's data sheet, illustrates the nonlinear

behavior of the photo response curve in dual slope mode.

Name Address Write the following

HDR_CONTROL: (Address: 0xF1000280) 0x02000003

KNEEPOINT_1: (Address: 0xF1000284) 0x00000FA0

KNEEPOINT_2: (Address: 0xF1000288) 0x000007D0

KNEEPOINT_3: (Address: 0xF100028C) 0x000003E8

Table 27: Example: 3 knee-points

Figure 33: IBIS5A nonlinear photo response curve with two slopes