Balance White Auto - Basler GIGE VISION ace acA640-100gm/gc Manual

Area scan cameras

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10.10.5 Balance White Auto

Balance White Auto is the "automatic" counterpart of the manual white balance feature. The

balance white auto function is only available on color models.

Automatic white balancinf is a two-step process. First, the Balance Ratio Abs parameter values for

red, green, and blue are each set to 1.5. Then, assuming a "gray world" model, the Balance Ratio

Abs parameter values are adjusted such that the average values for the "red" and "blue" pixels

match the average value for the "green" pixels.

The balance white auto function uses Auto Function AOI2 and can only be operated in the "once"

mode of operation.

If Auto Function AOI2 does not overlap the Image AOI (see the "Auto Function AOI" section) the

pixel data from Auto Function AOI2 will not be used to control the white balance of the image.

However, as soon as the Balance White Auto function is set to "once" operation mode, the Balance

Ratio Abs parameter values for red, green, and blue are each set to 1.5. These settings will control

the white balance of the image.

For information on the white balance feature, see Section 7.2 on

To use the balance white auto function, carry out the following steps:

1. Select Auto Function AOI2.

2. Set the position and size of Auto Function AOI2.

3. Enable the balance white auto function by setting it to "once".

You can carry out steps 1 to 3 from within your application software by using the pylon API. The

following code snippet illustrates using the API to use the auto function:

Selecting and setting Auto Function AOI2: See the "Auto Function AOI" section above.

Enabling the balance white auto function and selecting the "once" mode of operation:

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// Select the AOI to use for auto white balancing

// Currently AOI2 is predefined to gather the pixel data needed for

// automatic white balancing

// Set position and size of the auto function AOI

Camera.AutoFunctionAOISelector.SetValue( AutoFunctionAOISelector_AOI2 );

Camera.AutoFunctionAOIOffsetX.SetValue( 0 );

Camera.AutoFunctionAOIOffsetY.SetValue( 0 );

Camera.AutoFunctionAOIWidth.SetValue( Camera.AutoFunctionAOIWidth.GetMax() );

Camera.AutoFunctionAOIHeight.SetValue( Camera.AutoFunctionAOIHeight.GetMax() );

// Set the mode of operation for balance white auto function

Camera.BalanceWhiteAuto.SetValue( BalanceWhiteAuto_Once );

Standard Features

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Balance White Auto - Basler GIGE VISION ace acA640-100gm/gc Manual

10.10.5 Balance White Auto

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