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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

Point Grey Flea3 GigE - Page 86