ImasUncaption subtitle remover plugin v0.81c by BongoreP (ぼんごれP)
2nd Aug 2008

Translated by Maverick Tse (23 Dec 2013)
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Intro
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This is a plugin to make hard-coded subtitles look less conspicous, using edge detection, interpolation and blurring(blurring can be opted out).

Installation
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Copy ImasUncaption.auf into the .\Plugins folder of AviUtl.
(Just delete this file for uninstall)

Basic operation
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1> Load your video into AviUtl. Move to a frame where subtitle appears.
2> Open up the setting dialog from [Settings>Imas Uncaption...]
3> Enable the filter by ticking the checkbox on the top-right corner.
4> Tick the checkboxes for "Visualize effective area" and "Set effective area by mouse".
5> Set the Width and Height sliders to some positive value, so that a grey rectangle appear on the top left corner of the video.
6> On the main window, click on the center of subtitle.
7> Adjusting StartX, align the left edge of the CENTER grey box just to the left of the first character.
8> Adjusting StartY, align the top edge of the CENTER grey box just above the top of the tallest character.
9> Set Height, so that the dark grey box can cover all subtitle text in the vertical direction.
10> Set Width, so that the dark grey box can cover the LONGEST subtitle in the video.
11> Uncheck "Visualize effective area"
12> Tick "Chroma analysis" and "Remove subtitle". If your want blurring, also check "Blur detected edge".
13> A preview of the subtitle-removal effect should be showing in the main window. Adjust sensitivity and ChromaTh (Blur slider also if you want bluring) to the best settings you could achieve.
14> Preview the video or encode the video to AVI/MP4/MKV

Advanced operation --- Setting for individual subtitle
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Using the basic operation, this plugin will analysis the same area throughout the length of the video.
However, it is possible to vary the length of processing area (manually) to match each subtitle.

1) Follow Basic Operation, working on the FIRST frame with subtitle, up to step 10.(Yet, the width just need to fit this particular line of subtitle.)
2) Click on "Set boundary" once.
3) Move to the frame where this line of subtitle JUST disappeared.
4) Uncheck "Chroma analysis", "Remove subtitle" and the two "Blur" options.
5) Click on "Set boundary"
6) Move to the start of the next subtitle, set the size of the grey box to match the new line, then go back to step (2). Repeat for the remaining lines.

7) Just before preview or encoding, 
Uncheck "Visualize effective area" and "Visualize pixels to be processed";
Tick "Follow boundary setting","Chroma analysis", "Remove subtitle", and optionally for the two "Blur" options.

8) Proceed to preview or encoding