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

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Revision as of 16:59, 25 July 2017

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DVO Scratch

DVO Scratch processes vertical/continuous scratches.

 

These are typically those not being detected by dust/dirt removers, which are looking for random defects in the picture. The process is fully automatic and has an advanced detection algorithm with a fill-in result far superior to the normal process of hiding the defect using information from both sides of the scratch.

Basic Settings

ch-dvo_scratch-basic

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

Scratch Detection Parameters

ch-dvo_scratch-params

Colour Mode

This determines the image channels detection is undertaken in.

 

Values :

Y, R+G+B, R,G,B

Default :

Y

 

where :

Y

Luminance detection only (fastest).

R+G+B

Separate detection in R, G and B channels.

 

Processing of each channel is based on the combined result from the detection.

R,G,B

Separate detection in R, G and B channels.

 

Each detection channel affects the corresponding processing channel.

Column Aggressiveness

First stage detector aggressiveness, which determines what columns (and pixels) are selected as scratch candidates to be processed. The higher the setting, the more aggressive.

 

Range :

0.0 - 1.0

Default :

0.5

Pixel Aggressiveness

Second stage detector aggressiveness, which is a modifier for pixel selection within the selected columns (from the first stage). The higher the setting, the more aggressive.

 

Range :

0.0 - 1.0

Default :

0.5

Scratch Type

Used to describe scratch characteristics. For moderate scratches, typically choose the specific scratch type evident in the material. In case of very heavy scratches, with emphasised edges, it can be advantageous to select W+B.

 

Values :

White, Black, W+ B

Default :

White

 

White - for white (brighter) scratches.
Black - for black (darker) scratches
W+ B - for a mixture of black and white scratches

 

dv_alert

Do not use W+B as a default setting as it will sometimes process too much in the picture.

Scratch Width

Sets the width-profile for scratches.

 

Values :

Thin, Normal, Wide

Default :

Normal

 

dv_note

If detection/processing is insufficient in areas which have many scratches close by, a Wide setting is recommended.

Image Noise Level

Characterises the level of noise in the image. Image noise will affect the accuracy of detection.

 

Range :

0.0 - 1.0

Default :

0.3

Processing Parameters

ch-dvo_scratch-processing-params

Colour Mode

This determines the colour mode of scratches we detect and process.

 

Values :

RGB, YUV

Default :

RGB

 

where :

 

YUV - for monochrome scratches
RGB - for colour scratches

 

dv_alert

YUV colour mode can not be used in detector mode R,G,B.

Base Strength

Determines base strength of the processing. This affects properties such as smoothness (as might be noticed in wide scratches).

 

Range :

-3 to +3

Default :

0

Residual Strength

Determines the strength of processing the "residuals" e.g. very jagged scratch may need additional processing.

 

Range :

0.0 - 1.0

Default :

0.5

 

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