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Description of the data path

PIKE Technical Manual V4.0.0

134

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 16384 x 14 bit is 28 kByte, programming can not take place in a one

block write step because the size of an LUT is larger than GPDATA_BUFFER.

Therefore input must be handled in several steps. The flow diagram below

shows the sequence required to load data into the camera.

To configure this feature in an advanced register: See Table 143: LUT control

Note

• The input value is the 14-bit value from the digitizer.

• The two gamma LUTs use LUT 14 and 15.

• Gamma 1 (gamma=0.7) switches on LUT 14, gamma 2

(gamma=0.45) switches on LUT 15. After overriding

LUT 14 and 15 with a user defined content, gamma

functionality is no longer available until the next full

initialization of the camera.

• LUT content is volatile if you do not use the user pro-

files to save the LUT.

Figure 69: Loading an LUT

Query limits from

LUT_INFO and

GPDATA_INFO

Set EnableMemWR

to true (1)

Set AddrOffset to 0

Write n databytes

GPDATA_BUFFER

Offset is increased

in camera after n

bytes are written

Check

EnableMemWR for

no change

Repeat steps until

all data is written

Set EnableMemWR

to false (0)

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Allied Vision Technologies Pike Manual de Instruções Página 134