UM:Dvo Effects Dvo Steady
Also see : DVO Steady II |
DVO Steady is used to reduce unsteadiness due to film weave during scanning or camera shakes during capture of footage. A two pass solution, including advanced motion estimation, provides better separation of random instability and pan/tilt movements.
DVO Steady can be used for both film and progressive video material.
The two passes are :
Analysis
The first pass collects analysis data from the pictures. This is used in the processing stage.
The default settings work with most types of material, so just enable the Analyze control and let the shots be analyzed before processing takes over.
A key frame is added for every analyzed frame containing the analysis data. Complete analysis of the selected clip(s) should be done before looking at the result and adjusting the processing parameters. |
Mode, Size and Density
Mode
The analysis looks at the complete frame with selectable focus instead of locking to a single point. This has several advantages, especially in archiving/restoration applications with time constraints and problems like camera shake and film stretching.
The Mode control determines where the analyzer focuses within the frame.
Values : |
Full, Centre Weighted, Border Weighted, Frame Only |
Default : |
Full |
• | Full - Complete frame |
• | Centre Weighted - Complete frame with priority towards centre |
• | Border Weighted - Complete frame with priority towards borders |
• | Frame Only - Only analyzes film frame edge (i.e. requires complete frame edges). This is further specified by the "Frame Only Border Enable" controls.</br> |
Size
Sets analyzer size, which should be related to image size and motion.
Values : |
Small, Medium, Large |
Default : |
Medium |
Size Setting |
Suitable For |
Small |
SD - low/normal motion HD/2K - low motion |
Medium |
SD - normal/high motion HD/2K - normal motion Default |
Large |
HD/2K - high motion 4K - low/normal motion |
Density
Determines the amount of analysis within the frame.
Values : |
Small, Medium, High |
Default : |
Medium |
• | Low - Lowest safety margin - less accurate |
• | Medium - Normal safety |
• | High - Increased safety margin, more accurate |
Region of Interest
Set or find active area of picture - the region of interest to be analysed.
Values : |
Disabled, Specific |
Default : |
Specific |
• | Disabled - use complete frame |
• | Specific - set region of interest via additional parameters below |
ROI Size
This is the number of pixels from each edge where the frame (active area) starts.
Range : |
0 to 2048 |
Default : |
0 pixels |
Only borders which have visible “non-clipped" film frame edges must (can) be used and Region of Interest must be set to include those. |
Processing
Processing parameters are applied to the pictures in accordance with the result from the analyze pass.
Basic Setup
Enable
This toggle button allows you to enable/disable the effect. By default, as soon as the effect is added it is applied/enabled
Colour
The drop-down list will default to the project setting for the input format. You need to set this control according to the material that you are working with. If the footage was shot with a video camera, select a linear format. If this control is not set correctly the material may not be processed properly.
Default : |
From Project |
Analyze
This toggle button enables the analysis function.
After analysis, if you change any of the processing parameters you will need to re-run the analyse step. |
Peak / XOffs / YOffs
Once analysis is complete, these display some statistical results.
Aggressiveness
This parameter determines how aggressive the effect should be in attacking unsteadiness.
Range : |
1 - 10 |
Default : |
5 |
Low values are used for fine errors (small and quick) e.g. introduced by a scanner/telecine and does not try correct for slower and larger movements.
High values does not only take care of fine errors but also handles coarse errors (large and slow) like very old material or handheld/shaky cameras.
Reduction
Used to set how much the unsteadiness should be decreased, with separate controls for horizontal (X) and vertical (Y) reduction.
Range : |
0 - 100 |
Default : |
100 % |
A bit of residual unsteadiness might be necessary to create a more natural result sometimes e.g. a camera shaking during frame capture resulting in motion blur. |
Max Adjust
Sets a maximum limit (in pixels) for how much the process is allowed to adjust the stabilized frames, with separate horizontal (X) and vertical (Y) controls.
Range : |
0 - 100 |
Default : |
20 pixels |
Motion Safety
Adaptively reduces the unsteadiness correction based on motion.
Range : |
0 - 10 |
Default : |
5 |
In high motion sequences, errors are more likely to occur. A high Motion Safety setting limits the allowed unsteadiness correction so that any errors will become less obvious.
Quality Safety
Adaptively reduces the unsteadiness correction in accordance with an analyze quality measure recorded during the analyse pass.
Range : |
0 - 10 |
Default : |
3 |
Under certain circumstances, the analysis may be complex and more difficult. This is signaled by a quality value.
When the analysis quality is low, errors are more likely to occur. In this case a high setting of the Quality Safety control limits the allowed unsteadiness correction in such parts of the material, so that any errors will become less obvious.
Mask
Mode
Determines if and how the (shaking) borders should be masked.
Values : |
Disable, Follow Max Adjust, Specific |
Default : |
Follow Max Adjust |
where :
• | Disable - Less safety. Less accurate. |
• | Follow Max Adjust - Use settings as per Max Adjust parameter |
• | Specific - use settings as per Max Size parameter |
Size
Sets the mask size for Specific mode.
Range : |
0 - 100 |
Default : |
20 |
Soft Border
When Enabled (default), creates a soft border where the picture has been clipped.
Zoom
Enlarges the picture according to selected mode.
Values : |
Disable, To Blanking, Fill Screen (Letter/Pillar Boxed), Fill SCreen (Full) |
Default : |
Disable |
• | Disable - No zoom - Default |
• | To Blanking - Enlarges to specified blanking (see below) |
• | Fill Screen (Letter/Pillar Boxed) - Enlarges picture until either full vertical or full horizontal size is reached. |
• | Fill Screen (Full) - If necessary, makes a cutout to fill the complete frame (i.e. no black borders/blanking) |
Blanking
The Blanking Mode determines whether to use a masked or a full image.
Set blanking mode to Specific and specify Blanking Size if blanking (mattes) should be added to the processed pictures.
• | Disable - Use complete image |
• | Specific - Apply blanking (mattes) according to Blanking Size controls - Default |
Border Size
Range : |
0 - 2048 |
Default : |
0 pixels |
This specifies the number of pixels from the each edge of the picture.
Scene Cut
Determines if the first/last frame of a scene/shot should be adjusted (Low/Medium/High Safety) or not (Fixed). Start and End mode are set separately.
Under certain circumstances (typically for very unsteady material), a Fixed setting might look wrong. |