Really this parameter is scaled internally in MVTools, and you must always use reduced to block size 8x8 value. If you use 16x16 blocks, SAD will be 320*4. If you use 4x4 blocks, SAD will be 320/4. It this case SAD will be 8x8x5 = 320 (block will not detected as changed for thSCD1=400). Suppose we have two compared 8x8 blocks with every pixel different by 5. But real blocks are always different because of objects complex movement (zoom, rotation, deformation), discrete pixels sampling, and noise. For exactly identical blocks we have SAD=0. The threshold is compared to the SAD (Sum of Absolute Differences, a value which says how bad the motion estimation was ) value. It may be useful for noisy or flickered video. Raising it will lower the number of blocks detected as changed. So it is one of the thresholds used to tweak the scene changes detection engine. When a block has changed, it means that motion estimation for it isn't relevant.
#AVISYNTH V2.5.7.0 32 BIT#
Native 10-16 bit colorspaces (and 32 bit float in MDegrain) are available when using MVTools with AviSynth+ r2294-.įilters that use motion vectors have common parameters. Notes 2: Stacked 16 bit output for MDegrain1-6 and MDegrainN are also supported in general. Some complex scripts (MVBOB, MCBOB, TempGaussMC) use MVTools for motion compensated deinterlacing.Īlternatively you can try to use Motion plugin by mg262. Notes 1: Try to use a smart deinterlacer for interlaced video (SeparateFields may works too with or without SelectEven/SelectOdd). If you really interested in motion estimation and compensation topics, you can easy find numerous scientific publications (use WWW search). Try to read the postings in addition to this documentation and ask for support there. In particular see old MVTools thread, true motion thread, new MVTools thread and some other. There are many discussions about motion compensation using at doom9 Avisynth forum. Use it for appropriate cases only, and try to tune its parameters. It is not simple but quite advanced plugin. Complex Avisynth scripts with many motion compensation functions may eat huge amount of memory and result in very slow processing. Severe difficulty is also due to objects mutual screening (occlusion) or reverse opening. In some complex cases (video with fading, ultra-fast motion, or periodic structures) the motion estimation may be completely wrong, and compensated frame will be blocky and (or) ugly. Of course, the motion estimation and compensation is not ideal and precise. Alternatively, you can use compensated and original frames to create interleaved clip, denoise it by any external temporal filter, and select central cleaned original frames for output (see examples). Plugin can create compensated neighbor frames for every current frame, and denoise it by internal function. So, we may (for example) use strong temporal denoising even for quite fast moving objects without producing annoying artifacts and ghosting (object's features and edges are coincide if compensation is perfect). Every object (block) in this (fully) compensated frame is placed in the same position as this object in current frame.
#AVISYNTH V2.5.7.0 FULL#
The output of MAnalyse (server) is special clip with motion vector information in some format.Īt compensation stage the plugin client functions read the motion vectors and use them to move blocks and form motion compensated frame (or realize some other full or partial motion compensation or interpolation function). SAD is a value which says how good the motion estimation was. The main measure of block similarity is sum of absolute differences (SAD) of all pixels of these two blocks compared.
The relative shift of these blocks is motion vector. At analysis stage plugin divides frames by small blocks and try to find for every block in current frame the most similar (matching) block in second frame (previous or next). Plugin uses block-matching method of motion estimation (similar methods are used in MPEG2, MPEG4, etc). The plugin contains the motion estimation server-function MAnalyse to find the motion vectors and several motion compensation client-functions (MCompensate, MMask and others) which use these vectors. Motion compensation may be used for strong temporal denoising, advanced framerate conversions, image restoration and other tasks. MVTools plugin for AviSynth 2.6 is a collection of functions for estimation and compensation of objects motion in video clips.