SonotaCo.JP
SonotaCo Network Japan Forum
SonotaCo.JP Forum Index
homeTop Page  FAQFAQ   検索検索   メンバーリストメンバーリスト   ユーザーグループユーザーグループ   登録する登録する 
 プロフィールプロフィール   プライベートメッセージをチェックするプライベートメッセージをチェックする   ログインログイン 

bbf warning

 
新しいトピックを投稿   トピックに返信    SonotaCo.JP Forum Index -> UFOCapture BBS in English
前のトピックを表示 :: 次のトピックを表示  
投稿者 メッセージ
dimi in



登録日: 2016.09.15
記事: 1

記事日時: Tue Oct 18, 2016 7:02 pm    記事の件名: bbf warning 引用付きで返信

hello,

i am a student, trying to use UFO Analyzer for meteor classification. While the analysis is running on meteors, for the cases that a meteor is identified as a ''sporadic'', i get a warning about the bbf. And after the analysis when i check the characteristics of the specific meteor i always get Vo=-1.0.

Could you please describe to me what this setting is? i searched in the manuals but i couldnt find an answer .

Please note that i am a beginner with the software.

Thank you very much in advance,
Dimi
トップに戻る
ユーザーのプロフィールを表示   AIM
SonotaCo
Site Admin


登録日: 2004.08.07
記事: 9024
所在地: 139.66E 35.65N

記事日時: Wed Oct 19, 2016 9:35 am    記事の件名: Re: bbf warning 引用付きで返信

Hi
It is a bit complex.
What is your video capture device?

The conclusion is ...
If it is IEEE1394 capture device, then you should turn ON the "Bottom Field First" check box on the Profile sheet of UFOCaptureV2,
and check OFF the "bbf check" check box on the Uty sheet of UFOAnalyzerV2.

If your capture device is other, then turn OFF the "Bottom Field First" of UFOCaptureV2 and check OFF the "bbf check" of UFOAnalyzerV2.

The reason is ....

bbf is the field order problem on interlaced video.
Interlaced video contains two fields that are imaged on different timing in one frame. One is odd horizontal lines, and the other is even lines.

There are two types video capture devices in the world.
One is odd lines first and the other is reverse.
bbf : ON means the field that contains the bottom line is earlier in time, and OFF means older.
So, bbf must be properly set depending on the capture device for correct measurement.

But the problem is the difficulty of knowing the order.
Usually its order cannot be known through spec, data, nor device driver interface.
So UFOAnalyser has auto testing function of the field order by tracking the movement of one object that should be smoothly one way. But it is not perfect and possibly fails.
So if you got the bbf warning, you should check the setting of field order.
But if it happens occasionally, and it just caused by irregular movement of some object, you should ignore the warning.
And you can disable bbf check by checking OFF the "bbf check" check box on the Uty sheet of UFOAnalyzerV2.

The wrong bbf setting of existing clips can be corrected by editing the xml files, deleting the M*A.XML(analysis result) that are stored in capture directory, and analyze again.
トップに戻る
ユーザーのプロフィールを表示   投稿者のウェブサイトに移動
特定期間内の記事を表示:   
新しいトピックを投稿   トピックに返信    SonotaCo.JP Forum Index -> UFOCapture BBS in English All times are GMT + 9 Hours
Page 1 of 1

 
移動先:  
新規投稿: 不可
返信投稿: 不可
記事編集: 不可
記事削除: 不可
投票参加: 不可
このフォーラムで添付ファイルを投稿 できません
このフォーラムでファイルをダウンロード できます


Powered by phpBB © 2001, 2005 phpBB Group
Copyright ©2004 SonotaCo Network. All Rights Reserved.