Allied Vision Technologies MF-145B2 Instruction Manual download pdf (Page 78)

Marlin Technical ManualV.2.7.0

Description of the data path

Loading an LUT into the camera

Loading the LUT is carried out through the data exchange buffer called

GPDATA_BUFFER. As this buffer can hold a maximum of 2 kB, and a complete LUT

at 1024 x 8 bit is 1 kB, programming can take place in a one block write step. The

flow diagram below shows the sequence required to load data into the camera.

Note



• The input value is the most significant 10-bit value from

the digitizer. The gamma LUT of the CCD models outputs

the most significant 8 bit as shown above.

• As gamma correction for the CCD models is also imple-

mented via the look-up table, it is not possible to use a

different LUT when gamma correction is enabled.

• With all CCD models, the user LUT will be overwritten

when Gamma is enabled and vice versa.

• CMOS models have the gamma function built in the sen-

sor, so that it won’t be overwritten.

• LUT content is by default volatile, use user set function-

ality to store the LUT permanently in the camera.

Figure 39: Loading an LUT

Note



Configuration

• To configure this feature in an advanced register: See

Table 106: Advanced register: LUT on page 205.

• For information on GPDATA_BUFFER: See Chapter

GPDATA_BUFFER on page 225.

Query Limits from

LUT_INFO and

GPDATA_INFO

Set EnableMemWR

to true (1)

Set AddrOffset to 0

Write LUT data in

GPDATA_BUFFER

Set EnableMemWR

to false (0)

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Allied Vision Technologies MF-145B2 Instruction Manual Page 78