Extron-electronics VN-Matrix 200 Series User Manual download pdf (Page 74)

Temporal compression setting

Temporal compression may be applied by selecting the Temporal check box. By default, this

option should always be selected.

Temporal compression causes data to be transferred only when a change occurs between

frames.

Quality Control settings

The Threshold setting modifies the detection point of the temporal compression algorithm.

A value of 0 results in all changes between frames being sent.

As the threshold value is increased, only changes above a certain level are sent, thus reducing

the bit rate. This control is used to compensate for image sources that have a level of noise

in them. In general, there is always a certain amount of noise in any source that is produced

by an analog method. By applying a threshold, this noise can effectively be ignored by the

PURE3 compression engine, resulting in a lower transmitted bit rate.

• A setting of 0 is suitable for DVI computer generated sources. Sources with more

noise or video-type motion should use a setting between 1 and 4. Camera sources

should always use a value greater than 0.

• Motion compression can be modified between 0 and 15, where 0 is no additional

motion compression and 15 is full motion compression. When enabled, where

motion is detected on the screen that area is compressed more heavily. This reduces

bandwidth at a time when the eye cannot perceive significant detail. When the

motion stops, the screen area is resent at the standard resolution preserving the screen

integrity.

Chroma controls whether the temporal algorithm should consider changes in the color or

chrominance of the image. Enabling chroma gives better results on digital simulation type

sources, however chroma thresholds can increase the transmit bandwidth by up to 20%

so it should be disabled on bandwidth sensitive systems. It is usually not required on

video/camera type sources.

RefreshRate controls how frequently the non-changing parts of the screen are updated

in temporal compression mode. This is useful when connecting new displays to a

temporally encoded source and to fill in gaps in the data when using a lossy network

transport such as RTP. A value of 1 refreshes the screen in one second, a value of 0.1

refreshes the screen 10 times per second. A value of 0 disables the refresh.

VN-Matrix 200 Series • Advanced Setup Procedures 69

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Extron-electronics VN-Matrix 200 Series User Manual Page 74