Basler A600f Manual de usuario descargar pdf (Pagina 50)

Basic Operation & Standard Features

3-26 BASLER A600

DRAFT

3.7.1 White Balance

White balance capability has been implemented on the A601fc and A602fc cameras. With white

balancing, correction factors are applied to the interpolated RGB values for each pixel. The

correction factors can be used to adjust the color balance of the images transmitted from the

camera.

The white balancing scheme outlined in the IIDC specification dictates that blue and red are

adjustable and that green is not. On A601

fc and A602fc cameras, green has a fixed value of 64

(0x40) which corresponds to a correction factor of 1.0.

The Blue Value field of the White Balance control register (see page 4-22) can be used to change

the blue correction factor. The usable range of settings for this field is from 64 (0x40) to 255

(0xFF). If the field is set to 64 (0x40), blue will have the same 1.0 correction factor as green. If the

field is set to a higher value, blue will have a higher correction factor and the image will be more

blue. The default setting for the Blue Value is 112 (0x70).

To determine the correction factor for blue, use this formula:

The Red Value field of the White Balance control register can be used to change the red correction

factor. The usable range of settings for the this field is from 64 (0x40) to 255 (0xFF). If the field is

set to 64 (0x40), red will have the same 1.0 correction factor as green. If the field is set to a higher

value, red will have a higher correction factor and the image will be more red. The default setting

for the Red Value is 64 (0x40).

To determine the correction factor for red, use this formula:

To make your images appear less green, raise the correction factor for blue and red. To make your

images appear more green, lower the correction factor for blue and red.

The values for U and for V normally range from -128 to +127. Because the 1394 Dig-

ital Camera specification requires that U values and V values be transmitted with un-

signed integers, 128 is added to each U value and to each V value before the values

are transmitted from the camera. This process allows the values to be transmitted on

a scale that ranges from 0 to 255 (see Section 5.4.2).

When an A601

fc or A602fc is operating in a YUV (4:2:2) mode, the average number

of bits per pixel is 16. This means that the camera will require twice the bandwidth of

a camera operating in an 8 bit monochrome mode.

The A601

fc and A602fc can operate in several YUV (4:2:2) color modes and can also

operate in several monochrome 8 bit modes (see Section 3.13).

Blue Correction Factor

Blue Value Setting

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Red Correction Factor

Red Value Setting

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Basler A600f Manual de usuario Pagina 50

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