Apple D3423Z/A Datasheet download pdf (Page 11)

Product Overview

Shake 4

Advanced Image Processing

Shake 4 uses the power of optical ﬂ ow image processing to create extraordinary

image quality for retiming, shot stabilization, tracking, and more. Intuitive spline-

based controls o∂ er an unusual combination of ﬂ exibility and precision for warping

and morphing.

Optical Flow–Based Retiming

Timing controls are important to speed up, slow down, or sync a clip in time.

Shake 4 uses an advanced optical ﬂ ow–based system for retiming shots. Optical

ﬂ ow is a sophisticated method of motion estimation that automatically tracks an

image pixel by pixel in order to create “new” frames. The results are stunningly

smooth slow motion e∂ ects at amazingly low frame rates.

Each clip in Shake 4 can be nonlinearly retimed, allowing the user to go backward

and forward along a clip. For ﬂ exibility, this functionality is designed so that devel-

opers using third-party products like RE:Vision E∂ ects and The Foundry’s Furnace

can use their own retiming routines for high-quality results.

Smoothcam and Tracking

Shake 4 includes di∂ erent ways to stabilize a shot and match one element’s move-

ment to another. Stabilization is used to smooth out bumpy camera moves or

eliminate camera movement altogether. Smoothcam is a new stabilization method

in Shake 4 that uses optical ﬂ ow technology to automatically remove camera jitter

from static shots without setting tracking points. Artists can revive unusable shots

by correcting uneven pans across a scene with minimal user intervention.

Shake 4 also includes powerful tracking technology that works by following the

movement of pixels over a series of frames to create “motion paths” that other

elements can be attached to. Placing a logo on the side of a moving truck is the

classic example of how tracking is used. But the tracker in Shake 4 allows the user

to deﬁ ne various parameters so that tracking even the most di∑ cult of shots is

automated. Because most movement occurs at the subpixel level, the tracker can

sample down to subpixel accuracy. You can smooth a track, apply preprocessing,

operate in various color modes, and even weight the color channels.

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Apple D3423Z/A Datasheet Page 11