F_RigRemoval

F_RigRemoval eliminates unwanted objects, or rigs, from image sequences without the need for accurate rotoscoping or keying to produce a clean plate. The rig removal algorithm works by estimating the background motion between successive frames, ignoring the foreground object, and then using the motion information to look forward and backward in the sequence in order to find the correct piece of background to fill in the missing region.

See also RotoPaint and Project3D.

Inputs and Controls

Connection Type

Connection Name

Function

Input

RigMask

An optional mask to designate the rig area to remove.

Src

The source image containing the unwanted object or rig. The source may contain an alpha channel to define the rig area.

Control (UI)

Knob (Scripting)

Default Value

Function

F_RigRemoval Tab

Rig Region

rigRegion

Box

Defines the area to repair:

Box - repair the area inside a rectangular box, controlled by the Rig Region Box controls or the on-screen box.

Src Alpha - repair the region defined by the alpha of the Src input.

Src Inverted Alpha - repair the region defined by the inverted alpha of the Src input.

RigMask Luminance - repair the region defined by the luminance of the Rig Mask input.

RigMask Inverted Luminance - repair the region defined by the inverted luminance of the Rig Mask input.

RigMask Alpha - repair the region defined by the alpha of the Rig Mask input.

RigMask Inverted Alpha - repair the region defined by the inverted alpha of the Rig Mask input.

Frames Searched

framesSearched

Forward and Backward

Select whether to search forwards, backwards, or in both directions to find missing data.

Forward and Backward - searches before and after the current frame.

Forward - searches frames after the current frame.

Backward - searches frames before the current frame.

Frame Range

frameRange

4

Sets the number of frames the algorithm looks forwards and backwards in the sequence to find the missing data. If you are getting red pixels, then increase this value.

Frames Used in Range

framesUsed

Half of Frames

If the Frame Range is set to a large number, the rendering time can be prohibitive. Frames Used in Range may speed up the repair by not using every frame to fill the foreground region, effectively skipping frames. However, this may reduce the quality of the result.

All Frames - use every frame in the specified frame range to construct the repair.

Half of Frames - use every other frame in the specified frame range to construct the repair.

Quarter of Frames - use every fourth frame in the specified frame range to construct the repair.

10% of Frames - use every tenth frame in the specified frame range to construct the repair.

Max 25 Frames - use no more than 25 frames from the specified frame range to construct the repair. This option can be useful if Frame Range has been set to a very large number.

Max Rig Movement

maxRigMove

30

To avoid perspective changes, F_RigRemoval searches for the missing data inside an area immediately around the RigRegion. Max Rig Movement defines the width of this area (in pixels). Fast movement in the Src input may require a higher value than slow movement.

Rig Region Box

Rig Region BL

regionBL

N/A

The rectangular area used to define the repair when Rig Region is set to Box.

Rig Region BL - controls the position of the bottom left corner of the rig region.

Rig Region TR - controls the position of the top right corner of the rig region.

Rig Region TL

regionTR

N/A

Advanced

Filtering

filtering

Medium

Sets the filtering quality.

Low - low quality but quick to render.

Medium - uses a bilinear filter. This gives good results and is quicker to render than high filtering.

High - uses a sinc filter to interpolate pixels giving a sharper repair. This gives the best results but takes longer to process.

Luminance Correct

lumCorrect

disabled

Enable this to correct for luminance changes from information taken from other frames. This is particularly important if the lighting changes throughout the sequence.

Perspective Correct

perspCorrect

disabled

Enable this to correct for minor perspective changes.

Overlap Correct

overlapCorrect

1

The repair is built up using slices of information from other frames in the sequence which are then overlapped and blended to give a more natural looking repair. This value controls how much the regions overlap. Increasing this value too much degrades image sharpness.

Repair Fail Marker Opacity

failOpacity

0.5

Sets the level of transparency of the red pixels used to show where the repair has failed.

Preserve Alpha

preserveAlpha

disabled

Enable this to preserve the original alpha channel. By default, the alpha channel is set to white where the repair has failed and black everywhere else.

About

about

N/A

Displays a dialog containing information about this node.

Step-by-Step Guides

Using F_RigRemoval