Window Width/Window Level

DeVillies

Senior Member
Canadian French
Oï:

Je viens de me taper tout un texte avec une redondance extrème de ce "window width/window level", dont je traduis simplement avec "largeur et niveau". Simple, non?

Ah mais attendez! Tout le texte, sur un logiciel d'imagerie, assigne le terme "window width/window level" contextuellement à "Changer le contraste/brillance à l'écran"

Tous ces icône et ces fonctions de ce "window width/window level" sont à ce sujet et je ne trouve aucune référence pouvant confirmer une traduction encore moins une définition.

Je vénère celui qui peut mettre cette confusion au clair!

- DeVillies
 
  • RuK

    Senior Member
    English/lives France
    Je ne vois pas pourquoi ça vous gêne - j'ai pas bien compris. Pourquoi serait-il autrement? Tout ça a à voir avec le contèxte visuel sur l'écran, pourquoi pas les mettre ensemble? Window w/level pour moi, comme pour vous, serait largeur/niveau.
     

    JeanDeSponde

    Senior Member
    France, Français
    Fenêtre d'analyse et position de la fenêtre.
    Oui, en imagerie médicale c'est l'équivalent de luminosité et contraste pour correction...
    Cf le paragraphe "Windowing" du Wiki sur la tomographie.

    The concept of Window and Level is quite simple. Out of the possible 4096 shades, there is usually a certain range of intensities that is most interesting for studies. The method to define this intensity range is called Window and the distance between the two ends of the range is called the Window Width.
    Now, let’s introduce the concept of Leveling. Tissues with higher density may produce lots of "dark" pixels while less dense tissues will be more "bright" in the image. This is where Level comes in to play. Level is a mathematical function which defines how to map pixel values within the window into display luminances.
     

    Alipeeps

    Senior Member
    UK
    UK - English
    If I'm understanding correctly, it's referring to the functions of changing the appearance of the active window on a computer screen, no? On a computer screen/monitor, you usually have buttons to change the contrast/brightness of the screen and also buttons to alter the width of the window (stretching or compressing it along the horizontal axis - so making it wider or thinner) and the level of the window (this does not stretch the window but rather moves the entire window up and down the vertical axis). These buttons allow you to make sure that the window fits properly within the dimensions of the computer screen/monitor so that you can view all of the active window.
     

    JeanDeSponde

    Senior Member
    France, Français
    In a photography and image processing context, window is not the box displayed on the screen...
    It is the interval within which data are "interesting"(fenêtre d'analyse).
    Discarding too bright or too dark data is called windowing. The full dynamic of brightness is then re-spun in the "interesting" brightness range.
    Then, contrast-enhancement techniques (window levelling) are applied to allow for a better rendering of dark areas, while bright areas are dimmed to avoid over-exposure.
     

    Alipeeps

    Senior Member
    UK
    UK - English
    In a photography and image processing context, window is not the box displayed on the screen...
    It is the interval within which data are "interesting"(fenêtre d'analyse).
    Discarding too bright or too dark data is called windowing. The full dynamic of brightness is then re-spun in the "interesting" brightness range.
    Then, contrast-enhancement techniques (window levelling) are applied to allow for a better rendering of dark areas, while bright areas are dimmed to avoid over-exposure.

    Ah. Then we need more context to better understand which sense of the terminology this text is dealing with. :)
     

    DeVillies

    Senior Member
    Canadian French
    Why, did I miss that.
    Yes the context applies most perfectly. Fantastic!
    This was a stumbling block all the way.
    The room seems brighter around me now...

    Mr Desponde, you are my hero.

    - Alex
     

    JeanDeSponde

    Senior Member
    France, Français
    Mr Desponde, you are my hero.
    Sponde - my name is Sponde - JeanDe Sponde...
    Je n'aime quand même pas trop fenêtre d'analyse et position de la fenêtre (pourtant donnés par le GDT).
    Un p'tit coup de Google sur les logiciels de tomographie s'imposerait peut-être pour vérifier:eek:
     
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