Loading A Look-Up Table Into The Camera - AVT Pike Technical Manual

Configuration of the camera
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
• BitsPerValue = 14
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
• gamma OFF
• look-up table OFF
• look-up table ON

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).
1 byte per gray-value
2 byte per gray-value
look-up table is switched ON also
look-up table is switched OFF also
gamma is switched OFF also
gamma is switched OFF
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