Point Grey Flea3 GigE Technical Reference
8 Flea3 GigE Attributes
When Gamma is turned on, Lookup Table is turned off. When Lookup Table is turned on, Gamma is
turned off.
Alternatively, the camera has a 9-bit input lookup table that produces a 9-bit output. The LUT has two banks that the user
can select between. In RGB and YUV pixel formats, the LUT has three channels for red, green, and blue. In monochrome
and raw formats, there is a single channel, regardless of color or monochrome sensor. The LUT is available only in 8
bit/pixel formats.
Lookup Table allows the user to access and control a lookup table (LUT), with entries stored on-board the camera. The
LUT is modified under the following circumstances:
n
Camera reinitialization
n
Changing the current video mode or current video format
n
Changing gamma
The LUT can define 2 banks where each bank contains 1 channel. A channel defines a table with a length of 2
Input_Depth
entries where each entry is
Output_Depth
bits wide. Channel table entries are padded to 32-bits.
Each bank may be read only, write only or both read and write capable as shown by the
LUT_ Bank_Rd_ Inq
and
LUT_
Bank_Wr_Inq
fields. The active bank is set by writing to the
Active_Bank
field of the LUT_Ctrl register.
The Bank_X_ Offset_ Inq register gives the offset to start address of the array of channel tables in each bank. Multiple
channels can be used to process color video pixel data.
Lookup Table Data Structure
Each bank of channels is composed of entries padded to a complete 32-bits. Each bank is organized as show in the table
below.
Cn:
Channel Number
En :
Entry Number
C(0)E(0)
…
…
C(0)E(2
Input_Depth
-1)
C(1)E(0)
…
…
C(1)E(2
Input_Depth
-1)
…
…
…
C(Number_of_Channels-1)E(0)
…
…
C(Number_of_Channels-1) E(2
Input_Depth
-1)
Title
Article
How is gamma calculated and applied?
Knowledge Base Article 391
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Revised 10/29/2013
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