Axis Q7900 Rack User Manual download pdf (Page 13)

AXIS Q7406 - Video

CBR allows you to set a fixed Target bit rate that consumes a predictable amount of bandwidth. As the bit rate would usually

need to increase for increased image activity, but in this case cannot, the frame rate and image quality are affected

negatively. To partly compensate for this, it is possible to prioritize either the frame rate or the image quality whenever the bit

rate needs to be increased. Not setting a priority means the frame rate and image quality are equally affected.

Note:

determine a reasonable bit rate, go to Setup > Video > Video Stream > Image, check the Include checkbox and enter

the code #b in the Include text: field. The current bit rate will display as a text overlay on the Live View page.

To view the image stream while configuring the GOV settings and Bit rate control, select Open... under Preview.

MJPEG

Sometimes the image size is large due to low light or complex scenery. Adjusting the maximum frame size helps to control the

bandwidth and storage used by the Motion JPEG video stream in these situations. Defining the frame size as Unlimited

provides consistently good image quality at the expense of increased bandwidth and storage usage during low light. Limiting

the frame size optimizes bandwidth and storage usage, but may give poor image quality. To prevent increased bandwidth and

storage usage, the maximum frame size should be set to an optimal value.

Stream Profiles

There are 4 pre-programmed stream profiles available for quick set-up. These settings can be adjusted and new customized

profiles can be created. Each profile has a descriptive name, describing its usage and/or purpose. The profiles can be accessed

from the Live View page.

• To add a new stream profile, click Add to bring up the Stream Profile Settings panel.

• Choose a descriptive name a

nd enter a description for your profile.

• Choose the form of Video enco

ding you wish to use from the drop-down list:

H.264 - Also known as MPEG-4 Part 10. This is t

he new generation compression standard for digital video. This function

offers higher video resolution than Motion JPEG or MPEG-4 at the same bit rate and bandwidth, or the same quality

video at a lower bit rate.

Motion JPEG - Delivers a high quality video stream, from which individual

images can be extracted and saved.

• Copy an existing stream profile to your system and rename the copy

• Modify an existing stream profile based on the light situation and motion to be captured by your video encoder. See

Stream Profiles, on page 13 for more information.

• Highlight the stream profile you wish to remove, then click Re

move to remove it from the list.

Camera Settings

This page provides access to the advanced image settings for the AXIS Q7406.

Image Appearance

Color level - Select an appropriate level by entering a value in the range 0-100. Lower values mean less color saturation,

whilst the value 100 gives maximum color saturation.

Brightness - The image brightness can be adjusted in the range 0-100, where a higher

value produces a brighter image.

Contrast - Adjust the image's contrast by raising or

lowering the value in this field.

Video Input

Offset Adjustments - Entering values in these fields changes the horizontal and vertical synchronization for the image. This

can be used to eliminate any black border surrounding the image.

Be careful to only use low values, no more than 1-3,

as higher values may put the image out of sync.

4CIF de-interlacing - is used to improve video stream image quality from analog devices. Select Adaptive Interpolation from

the drop down list for best image quality. For improved image quality that is not as processor intensive, select Blending. If

de-interlacing is not necessary select None.

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Axis Q7900 Rack User Manual Page 13

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