Allied Vision Technologies MF-145B2 Manuel d'instructions télécharger pdf (Page 67)

Marlin Technical ManualV.2.7.0

Description of the data path

The values in the U/B_Value field produce changes from green to blue; the V/

R_Value field from green to red as illustrated below.

One-push white balance

The camera automatically generates frames, based on the current settings of all

registers (GAIN, OFFSET, SHUTTER, etc.).

For white balance, in total six frames are processed and a grid of at least

300 samples is equally spread over the work area. This area can be the field of

view or a subset of it. The R-G-B component values of the samples are added and

are used as actual values for for the one-push white balance.

This feature uses the assumption that the R-G-B component sums of the samples

are equal; i.e., it assumes that the average of the sampled grid pixels is to be

monochrome.

If the image capture is active (e.g. IsoEnable set in register 614h), the frames

used by the camera for white balance are also output on the 1394 bus. Any pre-

viously active image capture is restarted after the completion of white balance.

Figure 35: U/V slider range

Note



Configuration

To configure this feature in control and status register (CSR):

See Table 28: White balance register on page 66.

Note



The following ancillary conditions should be observed for suc-

cessful white balance:

• There are no stringent or special requirements on the

image content, it requires only the presence of mono-

chrome pixels in the image.

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Allied Vision Technologies MF-145B2 Manuel d'instructions Page 67