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Integrating noise reduction and video preprocessing functions with the hardware that performs video compression offers key performance advantages as well as the obvious savings of rack space, power and cooling support. Encoding noise is a waste of bandwidth.
Removing noise enables improved video delivery at lower bit rates. Noise shares the same space as valuable picture detail, and levels of noise can vary dramatically.
This is especially true with archive material and news feeds. A solution is to deploy multiple preprocessing filters, each with a specific role, and then combine them with an automatic control system to apply the optimal filter at the right strength in the right places.
The final objective of the video preprocessing and compression operation is to maximize the subjective quality of the decoded video signal for a given encoded bit rate.
A dedicated MPEG-2 video signal processor is used to extract input signal statistics that are used to assist the decision processes by the compression engine and preprocessing filters.
The MV50 employs a suite of preprocessing filters that perform spatial, temporal and spatio-temporal processing of the input video signal. This form of filtering is much more powerful than temporal-only filtering, in which pixels are filtered with other pixels at the same spatial location. Filtering is then applied using pixels that retain the same position relative to an object moving within the frame sampling structure. MCTF all but eliminates ghosting and trailing normally associated with temporal-only filters.
Random components are heavily suppressed, yet picture details are preserved. It also limits artifacts to within the threshold of visibility. Simple spatial filtering applies intra-frame, two-dimensional low-pass filtering to suppress high-frequency noise.
The downside of this technique is less picture detail. Viewers generally have limited tolerance for reduction in detail and edge definition; therefore, basic spatial filtering should be applied sparingly. Harmonic has developed a new spatial technique that is naturally edge preserving but allows significant filtering to remove noise with Gaussian characteristics. Impulse noise occurs for a single frame and is commonly seen as dots, scratches or film damage. This type of noise does not waste bits like random noise, but it has a significant effect on perceived picture quality and reduces the effectiveness of other noise reduction and compression mechanisms.
The MV50 encoder devotes two thousand million pixel comparisons per second to ascertaining whether a pixel, or group of pixels, are single-frame rogues. Once the impulses have been identified, it is relatively easy to substitute them using values based on spatio-temporal filtering operations.
It is well-known that progressive scan video material is more efficiently encoded than interlace video. Interlaced video can be made more efficient by performing an interlace-to-progressive spatio-temporal format conversion. Unfortunately, this operation introduces motion artifacts when viewed on an interlaced television. The EAT filter has been designed to perform an adaptive de-interlacing function on the input interlaced video signal.
Filtering is performed on regions identified as texture. However, edge-defining objects, or those containing regions of texture, are left in their native interlaced format. Filtering the textured regions in this way can provide the benefits of improved coding efficiency — much like those realized by de-interlacing — without the drawbacks. When this preprocessing technique is applied to sequences containing high spatial detail and motion, significant improvements in low bit rate encoding efficiency are obtained.
The combination of advanced compression technology and powerful and innovative preprocessing techniques is enabling enhanced delivery of digital content at ever-lower bit rates. Andrew W. Johnson is staff development engineer and Neil Brydon is senior group marketing manager for the Convergent Systems Division of Harmonic Inc. TVT logo Created with Sketch. TV Technology. Categories Miscellaneous. The latest product and technology information. Future US's leading brands bring the most important, up-to-date information right to your inbox.
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Harmonic DIVICOM MV50 MPEG-2 Encoder
Click here for a RMA. The product line offers the efficiency, features and performance to address the needs of every service provider. The MV50 encoder has a number of features, filters, and intelligent controls to consistently deliver the highest quality video in applications such as satellite and xDSL where bandwidth efficiency matters most. The MV 50 encoder extends the use of LookAhead technology to predict video complexity and apply filter control. New DiviTrackXE features include support for up to 24 encoders in a stat mux pool with individual channel priority control. These include impulse noise reduction, edge adaptive texture filtering, non-linear spatial filtering and noise level estimation, resulting in exceptional picture quality at lower bit rates.
Harmonic Divicom Mediaview R-MV50 VBR-C MPGE-2 Processor Encoder
Harmonic Inc. DPI is a key area of investment for broadcasters as it facilitates the regionalization of content to enhance local market relevance and also increases revenue potential. Harmonic also participated in a multi-vendor demonstration simulating digital ad insertion in overtime and early-end scenarios during sporting events. The demonstration highlighted the DiviCom MV50 video encoder's support of advanced capabilities within the SCTE 35 and an "in-progress" standard for uplink site cue message injectors that alert advertising equipment in a cable network headend.