Apple MA434Z/A User Manual - Page 747
refFrame, applyScale, applyRotate, subPixelResolution, tolerances, shutterOffset, aspectRatio, scale
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• shutterOffset: A subparameter of motionBlur. Controls the offset from the current frame that the blur is calculated. Default is 0; previous frames are less than 0. The global shutterOffset parameter is added to this. • aspectRatio: This parameter inherits the current value of the defaultAspect global parameter. If you're working on a nonsquare pixel or anamorphic image, it is important that this value is set correctly to avoid unwanted distortion in the image. refFrame The reference frame that is used to calculate the null state of the transformation. For example, scale has a value of 1 and rotate has a value of 0 at the reference frame. applyScale A parameter that becomes available when the tracker is set to two-point mode. Three buttons that allow you to disable the transform (click "none"), view the live calculated curve (click "live"), or to bake the curve (click "bake") to create editable data (keyframes). • scale: Opening the applyScale subtree reveals the scale slider, which determines the calculated scale for two-point matching. The scale at the refFrame is equal to 1, and all other frames are in reference to that frame. applyRotate A parameter that becomes available when the tracker is set to two-point mode. Three buttons that allow you to disable the transform (click "none"), view the live calculated curve (click "live"), or to bake the curve (click "bake") to create editable data (keyframes). • rotate: Opening the applyRotate subtree reveals the rotate parameter. A slider determines the calculated rotation for two-point matching. The angle at the refFrame is equal to 0, and all other frames are calculated with reference to that frame. subPixelResolution The resolution of your track. The smaller the number, the more precise and slower your tracking analysis. The possible values are: • 1: Area is sampled at every pixel. Not very accurate or smooth, but very fast. • 1/4: Area is sampled at every .25 pixels (16 times more than with a sampling of 1). • 1/16: Area is sampled at every .0625 pixels (256 times more than with a sampling of 1). • 1/32: Area is sampled at every .03125 pixels (1024 times more than with a sampling of 1). • 1/64: Area is sampled at every .015625 pixels (4096 times more than with a sampling of 1). Note: Most current computers are fast enough to quickly compute motion tracking even at 1/64 resolution, so don't feel the need to be conservative with this setting. tolerances The tolerances subtree contains subparameters that let you control this node's behaviors when the tracking quality decreases. Chapter 25 Image Tracking, Stabilization, and SmoothCam 747
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