Allied Vision Technologies Pike Manual de instrucciones descargar pdf (Pagina 291)

Configuration of the camera

PIKE Technical Manual V4.0.0

291

Loading a look-up table into the camera

Loading a look-up table into the camera is done through the

GPDATA_BUFFER. Because the size of the GPDATA_BUFFER is smaller than a

complete look-up table the data must be written in multiple steps.

To load a lookup table into the camera:

1. Query the limits and ranges by reading LUT_INFO and GPDATA_INFO.

2. Set EnableMemWR to true (1).

3. Set AccessLutNo to the desired number.

4. Set AddrOffset to 0.

5. Write n lookup table data bytes to GPDATA_BUFFER (n might be lower

than the size of the GPDATA_BUFFER; AddrOffset is automatically

adjusted inside the camera).

6. Repeat step 5 until all data is written into the camera.

7. Set EnableMemWR to false (0).

Note

The BitsPerValue field indicates how many bits are read from

the LUT for any gray-value read from the sensor. To determine

the number of bytes occupied for each gray-value round-up

the BitsPerValue field to the next byte boundary.

Examples:

• BitsPerValue = 8  1 byte per gray-value

• BitsPerValue = 14  2 byte per gray-value

Divide MaxLutSize by the number of bytes per gray-value in

order to get the number of bits read from the sensor.

Note

Pike cameras have the gamma feature implemented via a

built-in look-up table. Therefore you can not use gamma and

your own look-up table at the same time. Nevertheless you

may combine a gamma look-up table into your own look-up

table.

Note

When using the LUT feature and the gamma feature pay

attention to the following:

•gamma ON  look-up table is switched ON also

• gamma OFF  look-up table is switched OFF also

• look-up table OFF  gamma is switched OFF also

• look-up table ON  gamma is switched OFF

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Allied Vision Technologies Pike Manual de instrucciones Pagina 291