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52  Operational Reference Falcon™ 4-CLHS Series

Lookup Table (LUT) Overview

The Falcon4-CLHS cameras include a user programmable LUT (lookup table) as a component of its

embedded processing features. A LUT is used for operations such as gamma adjustments, invert

function and threshold processes.

The camera LUT tables are dependent on the sensor (see feature LUT Size) and is illustrated in the

following figure. Pixel data from the sensor is passed through the LUT memory array, where the

new programmed pixel value is then passed to the camera output circuit. The LUT data table is

stored along with other parameters with the user configuration function.

. . .

1020

1023

1022

1021

1023

1022

1021

1020

Output

Sensor

Pixel

Data

Simplified LUT Block Diagram

10-bit Input : 10-bit Output

LUT Programmed

as Invert Function

Simplified Example 10-bit to 10-bit LUT Block Diagram

LUT Size vs. Pixel Format

The LUT size will correspond to the camera’s sensor pixel size; for the current Falcon4-CLHS

standard firmware, this is 10 bits per pixel, i.e., 1024. All camera processing is performed at the

10-bit sensor pixel format of the camera, while the end user chooses the pixel format (8-bit or 10-

bit format) to output.

The default neutral LUT programming is as follows:

 With Pixel Format = Mono 10, the default LUT data value is equal to the LUT value for each

index. This is a linear LUT that does not modify the sensor data.

 With Pixel Format = Mono 8, the LUT remains to be a 10 bit in 10 bit out. The conversion to

8 bit occurs after the LUT.

LUT data is selected as a user file uploaded using the File Access controls. Refer to the Sapera

documentation for information about the SapLut Class. Note that a SapLut file can be uploaded but

cannot be read back.

Dalsa Falcon 4-CLHS Series User Manual

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