Axis Communications Security Camera Axis Communications Security Camera User Manual

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AXIS Q1604 Network Camera
Video and Audio
The pixel counter can be accessed from:
• Video & Audio > Video Stream. Under Preview, click Open and select the Show pixel counter option to enable the
rectangle in the image. Use the mouse to move and resize the rectangle, or enter the number of pixels in the Width
and Height elds and click Apply.
• Video & Audio > Focus. Select the Show pixel counter option to enable the rectangle in the image. Use the mouse to
move and resize the rectangle, or enter the number of pixels in the Width and Height elds and click Apply.
• The Live View page in Internet Explorer in Windows. Right-click in the image and select Pixel counter. Use the mouse
to move and resize the rectangle.
Image
The default image settings can be congured under Video & Audio > Video Stream. Select the Image tab.
The following settings are available:
• Resolution. Select the default resolution.
• Compression. The compression level affects the image quality, bandwidth and le size of saved images; the lower the
compression, the higher the image quality with higher bandwidth requirements and larger le sizes.
• Rotate image. If required, the image can be rotated.
• Color setting. Select either Color or Black & White. Black & White uses less bandwidth than Color.
• Mirror. If required, the image can be mirrored.
• Maximum frame rate. To avoid bandwidth problems, the frame rate allowed to each viewer can be Limited to a xed
amount. Alternatively, the frame rate can be set as Unlimited, which means the Axis product always delivers the highest
frame rate possible under the current conditions.
• Overlay settings. See Overlay, on page 23.
Click Save to apply the new settings.
H.264
H.264, also known as MPEG-4 Part 10/AVC, is a video compression standard that provides high quality video streams at low bit rates.
An H.264 video stream consists of different types of frames such as I-frames and P-frames. An I-frame is a complete image whereas
P-frames only contain the differences from previous frames.
The GOV length is the number of frames between two consecutive I-frames. Increasing the GOV length may save considerably on
bandwidth requirements in some cases, but may also have an adverse affect on image quality.
The Axis product supports two H.264 proles. The Main prole provides higher compression than the Baseline prole with the same
video quality, but requires more processing power to decode.
The bit rate can be set as Variable Bit Rate (VBR) or Constant Bit Rate (CBR). VBR adjusts the bit rate according to the image
complexity, using up more bandwidth for increased activity in the image, and less for lower image activity. CBR allows you to set a
xed 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, frame rate and image quality are affected negatively. To partly compensate for this, it is
possible to prioritize either frame rate or image quality. Not setting a priority means that frame rate and image quality are equally
affected. You must save your settings before they can take effect.
The current bit rate can be set to appear as text overlay. To do this, select the Include text check box option under Overlay
Settings and enter the modier #b in the eld.
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. Setting the frame size to the Default setting
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