Bosch VJT-X20XF-E - Page 47

VideoJet XF E Configuration using a Web browser | en 47
Bosch Sicherheitssysteme GmbH Installation and Operating Manual DOC | V5.51 | 2012.03
Min. P-frame QP
In the H.264-protocol, the Quantization Parameter (QP) specifies the degree of compression
and thus the image quality for every frame. The lower the QP value, the higher the encoding
quality. A higher quality produces a higher data load. Typical QP values are between 18
and 30. Define the lower limit for the quantization of the P-frames here, and thus the
maximum achievable quality of the P-frames.
I/P-frame delta QP
This parameter sets the ratio of the I-frame QP to the P-frame QP. For example, you can set a
lower value for I-frames by moving the slide control to a negative value. Thus, the quality of
the I-frames relative to the P-frames is improved. The total data load will increase, but only by
the portion of I-frames.
To obtain the highest quality at the lowest bandwidth, even in the case of increased
movement in the picture, configure the quality settings as follows:
1. Observe the coverage area during normal movement in the preview images.
2. Set the value for Min. P-frame QP to the highest value at which the image quality still
meets your needs.
3. Set the value for I/P-frame delta QP to the lowest possible value. This is how to save
bandwidth and memory in normal scenes. The image quality is retained even in the case
of increased movement, since the bandwidth is then filled up to the value that is entered
under Maximum bit rate.
Deblocking filter
You can activate a filter that reduces blocking in the image, thereby providing a smoother
image. Please note that this option requires additional computing power.
CABAC
You can activate an additional lossless compression of the video data. The same image quality
is retained while the data rate is reduced. This compression necessitates high computing
power.
GOP structure
Select the structure you require for the group of pictures depending on whether you place
greater priority on having the lowest possible delay (IP frames only) or using as little
bandwidth as possible.
Default
Click Default to return the profile to the factory default values.