Difference between revisions of "UM:Dvo Effects Dvo Upscale"

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Revision as of 15:57, 25 July 2017

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DVO Upscale

DVO Upscale provides optimised up-scaling of material and is of specific value when converting from SD to HD.

 

The algorithm maintains the high quality of edges, including diagonals, and is especially useful for graphics.

Basic Parameters

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Enable

The Enable button must be on to enable processing.

Optimisation

Values :

Fast , Advanced

Default :

Advanced

 

Optimisation determines the balance between speed and quality. In Advanced mode a special algorithm is used for the high frequency parts of the image to reduce scaling artifacts. In Fast mode this algorithm is disabled to gain speed at the expense of quality.

Mode

Values :

P -> P , i -> P , i -> i

Default :

P -> P

 

DVO Upscale has an internal de-interlace function in order to deal with multiple formats.

 

P is Progressive
i is interlaced

 

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The setting of progressive or interlaced here is not the same as video/image format (e.g. HD 1080i 50). It only describes how pictures were captured and whether to maintain this.

 

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The project must set up to render frames even if the output mode is interlaced. Internally, the effect needs to use a progressive (frame based) format for optimal results when both input and output are interlaced.

Fill

Values :

Auto , Vertical , Horizontal , Both

Default :

Auto

 

Controls how the input picture is mapped (scaled) to the output picture.

 

Auto

Scales input picture until vertical or horizontal limit of the output picture is reached, without changing aspect ratio.

 

Vertical

Fills the output picture vertically without changing aspect ratio. E.g. scaling a SD 4:3 picture to an HD 16:9 output format will result in a pillar-box format.

 

Horizontal

Fills the output picture horizontally without changing aspect ratio.  E.g. scaling an HD 16:9 picture to a 2k 4:3 picture will result in a letter-box format.

 

Both

Fills the output picture both vertically and horizontally. Does not keep the original aspect. Overrides the “Keep Input Aspect” E.g. scaling an SD 16:9 anamorphic to HD 16:9 will result in a full 16:9 format.

Keep Input Aspect

Reads clip properties and keeps the input aspect ratio and will also automatically compensate for non-square pixels.

 

This should normally be enabled, especially when up-converting from standard definition sources (525 or 625).

 

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If the clip has an incorrect aspect ratio you will have to change the clip properties in the library (Library/Properties).

Data

Values :

Linear , Log

Default :

From project

 

Set the clip data format.

 

Other Parameters

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Repos

X and Y repositioning after Fill mode is chosen.

Centre

Values :

On , Off

Default :

On

 

This centres the scaled image on the output picture. If disabled it maps the scaled image on the output picture from the lower left corner.

Field Order

Values :

Follow Clip , f1:f2 , f2:f1

Default :

Follow Clip

 

The Field Order parameter sets the input field order in time for interlaced input.

 

Follow Clip

Uses the clip properties (assumed correct).

f1:f2

Assumes top field first.

f2:f1

Assumes bottom field first.

 

dv_note

This setting is independent of the output field order as set in the project properties.

Resize

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X and Y scaling after Fill mode is chosen

Sharpen

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Adjusts post-scale crispness.

 

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The controls differ between Advanced and Fast modes.

 

Size

Values :

0.5 - 2.0

Default :

1.5

 

Adjusts the sharpening radius.

Amount

Values :

0 - 100

Default :

50

 

In Fast mode, this is the overall sharpness amount. In Advanced mode, the flat area sharpness amount.

Edge

Values :

0 - 100

Default :

50

 

Advanced mode only

 

Edge sharpening amount

Texture

Values :

0 - 100

Default :

100

 

Advanced mode only

 

Balances flat area texture and sharpening noise.

 

Recommended settings are 100 for normal images and 0 for graphics. If flat area noise is intrusive a setting lower than 100 will give less noise at the expense of texture definition.

Deinterlace Control

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In an analogue video signal there may be a visible half lines (unless removed when captured) i.e. half the line is blanked and the rest of the line contains image information. The last half line is usually unwanted when de-interlacing.

 

To remove the blanked part, enable Half Line Fix and select the line(s) to address for top (Top Fix Lines) and bottom (Bottom Fix Lines). This will ensure that the blanked part of the line is not visible in the final image.

Blanking

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Blanking controls can be used to cover up soft image edges or any other edge related problem.

 

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