Allied Vision Technologies AVT Stingray Manual de Instruções descarregar pdf (Página 117)

Description of the data path

STINGRAY Technical Manual V2.2.0

116

Look-up table (LUT) and gamma function

The AVT Stingray camera provides one user-defined look-up table (LUT). The

use of this LUT allows any function (in the form Output = F(Input)) to be

stored in the camera's RAM and to be applied on the individual pixels of an

image at run-time.

The address lines of the RAM are connected to the incoming digital data,

these in turn point to the values of functions which are calculated offline,

e.g. with a spreadsheet program.

This function needs to be loaded into the camera's RAM before use.

One example of using an LUT is the gamma LUT:

There is one gamma LUT (gamma=0.45)

Output = (Input)

0.45

This gamma LUT is used with all Stingray models.

Gamma is known as compensation for the nonlinear brightness response of

many displays e.g. CRT monitors. The look-up table converts the incoming

12 bit from the digitizer to outgoing 10 bit.

Figure 62: LUT with gamma=0.45

Output = f (Input)

200

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600

800

1000

0 500 1000 1500 2000 2500 3000 3500 4000

Input

Output

Stingray, gamma=0.45

1 2 ... 112 113 114 115 116 117 118 119 120 121 122 ... 308 309

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Allied Vision Technologies AVT Stingray Manual de Instruções Página 117