28
LPR Series | Universal
User’s Manual
5.2
Enhanced Codec
Enhanced codec is a method to keep low bitrate while H.264 is selected. The implementation of
enhanced codec depends upon 2 key ideas.
Dynamic ROI: It is for the camera to dynamically adjust compression based on what it believes is
relevant. For example, the camera would be able to detect objects and decide higher or lower
compression levels they would be. The function is designed to reduce the bandwidth by decreasing
the image quality on the static or irrelevant area within the whole scene.
Dynamic GOP: Adaptive GOP size. Comparing to the average-sampling of current standard fixed GOP
structure, with dynamic GOP the encoder has great freedom in I-, P- and B-frame selection. The
dynamic GOP structure keeps temporal importance information of frames in the encoded video,
which helps in adaptation to bandwidth decrease and temporal-SNR quality tradeoff decision. It also
helps in storing more information with restricted resource, results in code efficiency increasing and
better user perception.
The Enhanced Codec technology features the both iZone and iStream technologies to not only
economically exert leverage between different regions and compression levels, but also effectively
reduce the average bit rate to level down the overall bandwidth exploitation as the following elaborate
descriptions.
Basic Setting
iZone
iZone is a feature that utilizes the intelligent algorithm to place diverse compression levels upon
different areas while retaining the target bitrate. By enabling this feature, user can designate a
customized zone, which will be compressed less, to enhance the crystal image quality within the zone,
while the undefined zone, due to less important, will be sacrificed for image quality by higher
compression ratio.
Figure: iZone Settings
First, turn one of the Zone or both on and click and drag left button on the right-side preview image to
outline a desired zone. Also, user can select a wanted level for
each Zone. Press “Save” to make
settings take effect. If you want to delete settings, click “Clean” to wipe out the selected Zone settings.