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Algorithm: Dmritriy Vatolin
Implementation: Sergey Grishin

Filter is intended for recovering quality of video ripped from DVD (for example, when it contains 4 hours of video data), VideoCD or after decompressing by H.261, H.263, DivX 3, DivX 4, XviD.

Filter automatically determines the blockiness's strength on the frame and in the concrete part of it, preserving the maximum of details. Thus, filter will process marginally when on scenes with slow motion, while it will smooth very hard in the case of fast motion in the same film.

The main advantage of the filter is that it raise the integral quality in the most widespread PSNR metric in comparison with original film. That is, a film after decompression in comparison with original achieves the lower quality than a film after decompression and deblocking. (But for all that the original film is not used nowise, only decompressed data is used.)

What's new in version v2.0?

• New version in "High quality" mode works 2.1 times faster than v1.2 and 2.4 times faster in "High speed" mode.
• Conversions of color spaces optimized (SSE).
• Horizontal deblocking optimized (ÌÌÕ).
• New option of adjusting speed/quality parameter are available (25% speed improvement).
• Quality raised.
• Algorithm of automatic detection of blockiness level improved (more details are preserved).
• Chrominance components processing significantly improved.
• All basic deblocking methods changed. Discontinuities along borders of blocks is now absent, image looks more "naturally".

What's new in version v2.1?

• SSE optimization used only if it is supported by processor and OS
• Bug fixed: log is not created now
• Bug fixed: there is now no crashes during processing of frequencies in high resolution

What's new in version v2.2?

• Bug fixed: automatic SSE support detection is now works correctly
• Possibility of manual SSE instructions disabling in case SSE is supported by CPU and OS

Settings

Filter's interface allows to adjust the quality and the speed of processing. In "High speed" mode optimized version of horizontal deblocking works, which has slightly lower quality in comparison to "High quality" mode. In "High speed" mode filter works 25% faster. Using U-deblock & V-deblock it is possible to turn on/off the processing of chrominance components (turning these parameters on noticeably raise the visual quality). Using "SSE instructions" parameter it is possible to disable SSE if it is supported by the CPU and OS.

Filter supports Job Control, and it can be used from AviSynth. Example:

LoadVirtualDubPlugin("...\VirtualDub\plugins\MSU_DeBlock.vdf","Deblock", 0)
clip=AVISource("...\clip_input.avi", false, "RGB24")clip.ConvertToRGB32.Deblock(1, 1, 1, 1)

First filter parameter - U component deblocking
Second filter parameter - V component deblocking
Third filter parameter - high quality mode
Forth filter parameter - SSE instructions utilization

Examples

Let's consider the maintenance of the filter by the example of the test video sequence called "Battle"(The part of film "Terminator 2"). Case of very low bitrate:

Frame before processing

The same frame after processing by version 1.2

The same frame after processing by version 2.0

The next sample is an example of processing the sequence "foreman" (frame 152, compressed using Xvid with bitrate option 50kbs):

Frame before processing

The same frame after processing by version 1.2

The same frame after processing by version 2.0

Examples of filter performance on sequence "battle". Samples are placed in order of increasing of bitrate (frame 65, compressed using Xvid with bitrate option 100, 300, 500kbs):

Frame before processing	The same frame after processing
Frame before processing	The same frame after processing
Frame before processing	The same frame after processing

Let's consider the maintenance of the filter by the example of test sequence called "Foreman"(frame 155, compressed using Xvid with bitrate option 50, 75, 100kbs):

Frame before processing	The same frame after processing
Frame before processing	The same frame after processing
Frame before processing	The same frame after processing

There is two branches on the graph: the first (Blocked) corresponds to the film after decompression, the second one (MSU Deblocking) - to the film after decompressing and deblocking. The Y-direction is graduated by Y-PSNR metric of the film in comparison to an original one, noncompressed film. The X-direction is graduated by the bitrate (kbit/sec). Thus, it is easy to see that the quality of the film after deblocking is noticeably higher, at that the lower bitrate the higher difference.

Raising of the quality after deblocking

Raising of the quality after deblocking

License

Download

• Unpack this file in the folder "Plugins" in VirtualDub directory. File size 68 KB (in ZIP)

See also

• MSU SmartDeblocking v0.1 filter page (new deblocking algorithm)

Another resources

Video resources:

Public MSU video filters Here are available VirtualDub and AviSynth filters. Commonly we develop a whole family of some kind of a filter. Generally there are also versions optimized for PC and hardware implementations (ASIC/FPGA/DSP). These optimized versions can be licensed to companies. Please contact us for details via video(at)graphics.cs.msu_ru. MSU Cartoon Restore (New!) MSU Cartoon Restore (New!) MSU Noise Estimation (New!) MSU Frame Rate Conversion (New!) MSU Image Restoration (New!) MSU Denoising (Top!) MSU Old Cinema MSU Deblocking (Top!) MSU Smart Brightness and Contrast (Top!) MSU Smart Sharpen (Top!) MSU Noise generation MSU Noise estimation MSU Motion Estimation Information MSU Subtitles removal MSU Logo removal (Top!) MSU Deflicker (Top!) MSU Field Shift Fixer AviSynth plug-in MSU StegoVideo MSU Cartoonizer (Top!) MSU SmartDeblocking (Top!) MSU Color Enhancement MSU Old Color Restoration MSU filters FAQ (Read me!) MSU filters statistics	MSU filters for companies We are working with Intel, Samsung, RealNetworks and other companies on adapting our filters other video processing algorithms for specific video streams, applications and hardware like TV-sets, graphics cards, etc. Some of such projects are non-exclusive. Also we have internal researches. Please let us know via video(at)graphics.cs.msu_ru if you are interested in acquiring a license for such filters or making a custom R&D project on video processing, compression, computer vision. Automatic Objects Segmentation (New!) Semiautomatic Objects Segmentation New Frame Rate Conversion (New!) New Deinterlacer (New!) MSU-Samsung Deinterlacing Project Digital TV Signal Enhancement Old Film Recovery Tuner TV Restore Panorama Video2Photo SuperResolution SuperPrecision MSU-Samsung image and video resampling MSU-Samsung Frame Rate Conversion Motion Phase filter Deshaker (video stabilization) Film Grain/Degrain filter Deblurring filter Video Content Search
Codecs comparisons Objective and subjective quality evaluation tests for video and image codecs 4-th MPEG4-AVC/H.264 Comparison (New!) Lossless Video Codecs Comparison 2007 (New!) 3-rd MPEG4-AVC/H.264 Comparison HD Photo and JPEG 2000 Comparison MPEG-2 Decoders Crash Test (Top!) Subjective Compar. of 4 Modern Codecs (Top!) 2-nd MPEG-4 AVC/H.264 Comparison (Top!) FAQ of 2-nd H.264 Comparison 1-st MPEG-4 AVC/H.264 Codecs Comparison FAQ of 1-st H.264 Comparison JPEG 2000 Image Codecs Comparison (Top!) Lossless Video Codecs Comparison 2004 MPEG-4 SP/ASP Codecs Comparison (Top!) Video codecs comparison (old) Ext. link: x264 parameters efficiency comparison	Video quality metrics Programs with different objective and subjective video quality metrics implementation MSU Video Quality Metric - objective metrics for codecs and filters comparison (Top!) Implemented metrics short info: PSNR, Delta, MSAD, MSE, SSIM, VQM, MSU Blurring, MSU Blocking MSU Brightness Flicking Metric MSU Brightness Independent PSNR MSU Drop Frame Metric MSU Noise Estimation Metric MSU VQM Metric Tool FAQ MSU Human Perceptual Quality Metric - several metrics for exact visual tests (Top!) Implemented metrics short info: ITU-R BT.500-11: DSIS, DSCQS I & II, SCACJ; EBU: SAMVIQ; MSUCQE MSU PVQ Metric Tool FAQ
Video codecs projects Different research and development projects on video codecs MSU Lossless Video Codec (Top!) MSU Screen Capture Lossless Codec (Top!) MSU MPEG-2 Video Codec x264 Codec Improvement	Other Other information Crazy gallery (filters screams :) License for commercial usage of MSU VideoGroup Public Software (please be careful: some soft like metrics has another license!)

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Last updated: 12-October-2007

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Project sponsored by YUVsoft Corp.

Project supported by MSU Graphics & Media Lab