User`s manual

AW00089316000 Color Creation and Enhancement

Basler ace GigE 157

8.1.2 Pixel Data Formats Available on Cameras with

a Bayer Filter

Bayer Formats

Depending on the camera model the cameras equipped with a Bayer pattern color filter can output

pixel data in the following formats:

 For all cameras except the acA2000-50gc and acA2040-25gc:

Bayer BG 8, Bayer BG 12, or Bayer BG 12 Packed

 For the acA2000-50gc and acA2040-25gc only:

Bayer GR 8, Bayer GR 12, or Bayer GR 12 Packed

When a color camera is set for one of these pixel data output formats, the pixel data is not

processed or interpolated in any way. For each pixel covered with a red portion of the filter, you get

8 or 12 bits of red data. For each pixel covered with a green portion of the filter, you get 8 or 12 bits

of green data. And for each pixel covered with a blue portion of the filter, you get 8 or 12 bits of blue

data. (This type of pixel data is sometimes referred to as "raw" output.)

For complete details of these three pixel data output formats, see Section 9.1 on page 183 and

Section 9.3 on page 191.

YUV Formats

All color cameras with a Bayer filter can output pixel data in YUV 4:2:2 Packed format or in YUV

4:2:2 (YUYV) Packed format.

When a color camera is set for either of these formats, each pixel in the captured image goes

through a two step conversion process as it exits the sensor and passes through the camera’s

electronics. This process yields Y, U, and V color information for each pixel.

In the first step of the process, a demosaicing algorithm is performed to get RGB data for each pixel.

This is required because color cameras with a Bayer filter on the sensor gather only one color of

light for each individual pixel.

The second step of the process is to convert the RGB information to the YUV color model. The

conversion algorithm uses the following formulas:

Y = 0.30 R + 0.59 G + 0.11 B

U = - 0.17 R - 0.33 G + 0.50 B

V = 0.50 R - 0.41 G - 0.09 B

Once the conversion to a YUV color model is complete, the pixel data is transmitted to the host PC.

For complete details of the YUV data output formats, see Section 9.3 on page 191.