UM:Dvo Effects Dvo Stereo Fix

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DVO Stereo Fix

DVO Stereo Fix is an advanced stereo enhancement tool designed to resolve colour matching and geometry alignment issues with stereo sequences. The tool can address problem areas when they appear over the entire image frame (global correction) or in different areas inside a frame (local correction).

 

The tool will be able to correct most problems automatically but where this is not possible, controls are available that allow straightforward manual correction.

Enabling Stereo Work

Some basic setup is required to use the DVO Stereo Fix tool.

Project

Your project should be enabled for Stereoscopic Output :

 

ch-dvo-effects-dvo-stereofix-enable1

Composition

You should have Multi-track Grading enabled inside the project :

 

ch-dvo-effects-dvo-stereofix-enable2

 

dv_note

A clip with Multi-track enabled will display edge markers as shown below :

 

ch-dvo-effects-dvo-stereofix-enable3

Adding the Tool

DVO Stereo Fix must be added as an Input FX tool :

 

ch-dvo-effects-dvo-stereofix-add-to-inputfx

 

Overview

The tool has the following basic control layout, with the two primary tool areas being :

 

Colour matching controls
Alignment (geometry) controls

 

ch-dvo-effects-dvo-stereofix-overview

 

View Controls

ch-dvo-effects-dvo-stereofix-view

Mute

Mutes both the colour match and the align match, as well as any associated border/blanking modes.

 

The parameters in this section regarding view and orientation remain active i.e. SwapEyes/ViewMode/Mirror/Flip.

 

dv_note

This can be used to compare before and after while correcting any necessary mirror/flip.

Swap Eyes

Swaps left and right eye on output.

 

All parameters referring to either left or right are associated with the source left and right tracks. As such, the actual processing is not affected by swapping eyes on the output.

View Mode

Values :

Normal , Blended , Side-By-Side

Default :

Normal

 

This control allows different view modes to be applied on the output and is used mainly for visualisation purposes.

 

Normal

Separate left and right outputs.

Blended

Blends left and right image, which could be used to verify alignment processing.

Side-By-Side

Displays left and right images side-by-side with halved horizontal resolution.

 

If this mode is used to verify colour matching simultaneously, please note that many monitors might have        colour reproduction which varies spatially or by viewing angle.

Mirror Controls

ch-dvo-effects-dvo-stereofix-mirror

 

The Mirror Controls will automatically determine and correct for a mirrored left or right eye. If required, manual correction can also be set here.

Auto Mirror

Values :

Disable , Left , Right

Default :

Right

 

Automatically determines mirror and flip between left and right eye. If we detect a requirement to mirror or flip, it is applied to the specified eye.

 

dv_note

This automatic correction will follow any manual mirror or flip settings applied to the other eye.

Mirror Left

Manually set left eye to be mirrored.

Mirror Right

Manually set right eye to be mirrored.

Flip Left

Manually set left eye to be flipped (vertically).

Flip Right

Manually set right eye to be flipped (vertically).

Colour Matching

ch-dvo-effects-dvo-stereofix-colourmatch

 

These controls allow us to correct the colour match between the left and right eyes.

 

Colour Match

Values :

to Left , to Right

Default :

to Left

 

Sets colour processing to match the specified eye.

 

dv_note

Setting this to "to Left" will process the right eye to match the left.

Scene Mode

Values :

Disable , Uniform , Non-Uniform

Default :

Non-Uniform

 

Sets the colour matching mode for a scene such that the scene is analysed and processed equally throughout (all frames). The different modes relate to how colour matching may vary spatially over the image.

 

dv_note

This is unrelated to any spectrum transformation being uniform or non-uniform.

 

Disable

No colour match processing is performed (on scene basis).

Uniform

Colour matching is assumed to be spatially uniform.

Non-Uniform

Colour matching is allowed to be spatially non-uniform.

This mode typically works just as well when the colour differences are spatially uniform.

 

dv_alert

Scene Mode requires proper scene edits as normally one scene will behave very differently to another.

Frame Mode

Values :

Disable , Uniform , Non-Uniform

Default :

Disable

 

Sets the colour matching mode which is applied per frame individually.

 

The processing and modes are the same as described above for Scene Mode.

 

dv_note

This option can be used as an alternative to Scene Mode processing if it appears that colour differences change on a frame by frame basis. It is recommended that Scene Mode processing be Disabled when used.

Local Mode

Values :

Disable , Normal

Default :

Normal

 

This option allows for more localised colour match processing than found in Scene or Frame Modes. The Area Size and Sensitivity controls are linked to Local Mode processing.

Area Size

Values :

X-Small , Small , Medium , Large , X-Large

Default :

Medium

 

The smaller the Area Size is the more locally aggressive it can be considered to be.

 

Sensitivity

Values :

0 - 1023

Default :

64

 

The Sensitivity parameter is used to control the allowed difference ranges. The values we set correspond to 10 bit levels. The effect of Sensitivity is as a safety measure rather than a processing amount.

 

dv_note

To speed up the processing of complete scenes/material, Local Mode processing can be disabled.

Colour Match Safety

Values :

0.0 - 1.0

Default :

0.5

 

This parameter sets a general safety level for the Scene and Frame Mode colour matching.

 

Colour Match Safety applies to black levels as well as the analysis and variability of the spectrum transform applied.

 

dv_note

This does not include Local Mode, which uses Area Size and Sensitivity.

Alignment

ch-dvo-effects-dvo-stereofix-alignment

 

These controls allow us to correct the alignment (or geometry) between the left and right eyes.

Align Match

Values :

to Left , to Right

Default :

to Left

 

Sets alignment processing to match the specified eye.

 

dv_note

Setting this to "to Left" will process the right eye to match the left.

Align Mode

Values :

Disable , Manual , Global , Morph

Default :

Morph

 

The alignment processing is based on scene analysis and frames are processed equally throughout the scene. The alignment can also be set manually or adjusted with a global offset (Manual V-Offset).

 

Disable

No alignment processing.

Manual

Set manual global vertical offset (using Manual V-Offset).

Global

Automatic and global adjustment.

Morph

Spatially variable adjustment with linear variability over the image.

 

dv_alert

Like Scene Mode colour matching, Align Mode requires proper scene edits as normally one scene will behave very differently to another.

Manual V-Offset

Values :

0 - 128

Default :

0

 

Manual adjustment of the alignment.

Borders

ch-dvo-effects-dvo-stereofix-borders

 

The Borders controls let us correct any effect alignment has on frame borders.

 

dv_note

Border correction also depends on the Blanking configuration (see below).

Borders

Values :

Disable , Blank , Zoom Source , Zoom Fill

Default :

Zoom Source

 

Disable

Disable border processing.

Blank

Automatically applies necessary blanking to borders.

Zoom Source

Automatically zooms the output to the source frame and original blanking.

As per the Blanking Mode, this mode takes into account what needs to be excluded regarding the borders and alignment.

Zoom Fill

Automatically zooms the output to fill the full frame disregarding any original blanking of the source.

Centre

Values :

On , Off

Default :

On

 

Centre the result in the frame. This may be necessary for some Border modes.

Blanking

ch-dvo-effects-dvo-stereofix-blanking

 

Blanking is closely linked to the Borders control and allows us to control how the frame borders are blanked.

Blank Setup

Values :

Auto , Source , Output

Default :

Auto

 

Blank Setup lets us choose if blanking is setup by automatic analysis or manually in relation to the source or the output.

 

dv_note

Blanking affects the border processing and and its effect will depend on the Borders mode.

 

Auto

Use automatic analysis to define the blanking amount.

Source

Allow manual blanking setup.

Output

Manually specify blanking completely based on the output alone.

This requires you to regard frame effects from the alignment processing manually, as well as the original source frame blanking.

This is an Advanced Mode.

Blank Top / Left / Right / Bottom

Manual blanking adjustment to the top, left, right and bottom of the frame. Specified in pixels.

 

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