Thompson ViBE EM4000, User Manual

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Appendix A ’Technical Specifications’ — Features
ViBE EM4000 — Release 1.10 171
User Manual — 46073586AB02
HD Video encoding
Input HD video encoding formats
HD Video preprocessing
Video compression provided by the ViBE EM4000 Encoder is designed to
eliminate intra-frame and inter-frame redundancy. Any phenomenon,
such as noise, which reduces the original picture redundancy will have a
negative effect on encoding. Noise is particularly disadvantageous as it
adds high frequencies to the picture and the encoder is then unable to
distinguish these high frequencies from the useful information. The
same applies to picture sequences where high-frequency spatial texture
noticeably increases encoding complexity.
This explains the need for advanced video processing to:
„
reduce noise in video sequences to encode
„ slightly reduce definition in the complex areas of the picture
The Encoder therefore features 2 types of processing:
„ noise reduction processing
„
adaptive video filter processing
Noise reduction
Noise reduction is based on 2 features:
„ a median filter to reduce impulse noise. The median filter is a hybrid
filter which is used to linearly weight the results of several (spatial
median) non-linear filters in different directions
„ a motion-compensated recursive temporal filter to reduce other forms
of noise (Gaussian noise, quantization noise, etc.)
The Noise reduction feature can be set by the User.
Table A-12. HD video encoding formats
Mode
Vertical
Resolution
Horizontal
Resolution
Frame Rate
(Fps)
Interlaced 1080i 1920, 1440, 1280,
960 29.97 interlaced
Interlaced 1080i 1920, 1440, 1280,
960 25 interlaced
Progressive 720p 1280, 960, 640 59.94 progressive
Progressive 720p 1280, 960, 640 50 progressive