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Projection en relief : comment régler la polarité ? PDF Imprimer Envoyer
Samedi, 19 Novembre 2011 16:44

Qu'est ce que la polarité ?Pour projeter des contenus en 3 D, il faut nécessairement diffuser deux images sensiblement différentes qui reproduisent le point de vue de l'œil gauche et de l'œil droit. Le réglage de la polarité permet de s'assurer que l'image de l'œil gauche va bien à l'œil gauche et inversement. Dans le cas contraire, on parle de polarité inversée.

 

Comment repérer une polarité inversée ?

Une projection 3 D peut être représentée sous la forme d'une fenêtre virtuelle. Comme dans un tournage traditionnel, le réalisateur définit la place de chaque élément dans son cadre. Avec le relief, la révolution consiste à ajouter une dimension supplémentaire en simulant le point de vue des deux yeux à la projection. Selon l'effet voulu, le décalage des deux images va alors accentuer ou diminuer la sensation de relief perçu par le public.

IMG_1736_-_Copie_2

Plus les images sont décalées, plus les effets 3 D seront mis en valeur

Ainsi, les éléments paraitront plus ou moins proches dans la reproduction de la 3 D. A l'écran, cela peut se traduire par des effets de jaillissement (des éléments semblent sortir du cadre et bondir vers les spectateurs) :

lgende_beowulf

(1) La pointe de la lance est placée en jaillissement ou en « effet sortant » (« pop up »)

Au contraire, dans certaines scènes, les réalisateurs préfèrent accentuer la profondeur de champ. Dans ce cas, aucun objet ne traverse la fenêtre en direction du public, c'est le public qui a l'impression de regarder à travers une fenêtre dans laquelle se dessine une ligne d'horizon virtuelle :

tron_effet_de_profondeur

(2) Le relief de "Tron Legacy" offre une impressionnante sensation de profondeur

Pour que l'illusion soit possible, un travail minutieux est appliqué sur le décalage des deux images qui reproduisent le point de vue des deux yeux. Or, il est crucial que le réglage de la polarité soit respecté. Dans le cas contraire, les éléments ne seront plus placés correctement dans la fenêtre virtuelle ce qui va créer de nombreuses aberrations. Concrètement, les effets de jaillissement seront placés au fond du plan 3 D tandis que la ligne d'horizon ressortira en jaillissement :

FENETRE_VIRTUELLE_-_Copie_2

Les effets seront inversés ce qui va complètement fausser le relief des images

Ce mauvais réglage génère rapidement un inconfort visuel avec à la clé des sensations de malaise ainsi que des maux de tête. Pour repérer au premier coup d'œil une polarité inversée, une astuce consiste à retourner les lunettes 3 D et les porter à l'envers. Si le résultat est meilleur avec les lunettes inversées, c'est qu'il y a de fortes chances que le réglage ne soit pas correctement fait. Pour confirmer cette impression, la solution la plus fiable reste encore la projection de mires de test stockées dans le serveur ou livrées avec les DCP de films 3 D.

En fermant l'œil droit, le projectionniste doit voir uniquement le mot « Left » (gauche). La mention « Right » doit être complètement occultée. Si elle est encore légèrement visible (comme sur la photo ci-dessus), c'est qu'il y a des images fantômes (également appelées « ghosting »).

 polarit_left

Cette photo a été prise a travers le verre gauche de lunettes polarisées

Inversement, en fermant l'œil gauche, l'opérateur ne doit voir que le mot Right :

polarit_right

Cette photo a été prise à travers le verre droit de lunettes polarisées

Après ce test, le projectionniste a la garantie que le réglage est correct.

 

Comment régler correctement la polarité avec les outils logiciels du projecteur ?

Lors de la configuration du projecteur d-cinema, les installateurs se chargent du réglage du matériel. Cela comprend la création des macros, le masking ainsi que l'installation des périphériques qui gèrent les séances en relief. Dans les outils logiciels de commande, l'opérateur assigne un réglage de polarité avec les macros 3 D. Quel que soit le modèle du projecteur, cette fonction figure dans l'onglet « 3 D settings » :

polarit_barco_True_-_Copie

Faute de temps ou suite à une erreur, la polarité peut être inversée ce qui conduit aux effets désagréables décrits ci-dessus. Pour modifier ce réglage, il faut changer le L/R (pour Left / Right) Output Reference Polarity. L'utilisateur n'a que deux choix : Inverted ou True :

polarit_barco_inverted_-_Copie

Une fois ce changement effectué, il faut assigner ce nouveau réglage avec les macros 3 D du projecteur (1.85 FLAT – 2.39 scope) grâce à l'option « SAVE TO MACRO ».

 

Dans quels cas la polarité peut elle être déréglée ?

Une mauvaise installation n'est pas la seule cause de polarité inversée. D'autres situations dans l'exploitation courante peuvent entrainer un mauvais réglage.

Absence de vérification lors du déplacement du kit 3 D

Certains systèmes 3 D sont nomades. C'est le cas notamment des solutions dites « actives » (Xpand, Volfoni, Triple Eyes Shut). Selon les besoins , les opérateurs peuvent avoir à démonter les kits 3 D pour les déplacer d'une salle à une autre.

A la fin de l'installation, il est crucial que le projectionniste vérifie le réglage par la diffusion d'une mire. En effet, un bouton «Polarity » ou « Eye Rotation » est présent sur certains boitiers de synchronisation. Par erreur, ce bouton peut être enclenché pendant le transport ce qui va fausser la polarité.

Lunettes actives défectueuses

Il est possible que des lunettes actives endommagées affichent une polarité inversée alors que le projecteur et le périphérique 3 D sont bien réglés. La meilleure solution consiste alors à ne plus utiliser ces paires de lunettes.

Mauvais réglage suite à une retransmission en direct et en 3 D

Lors d'une retransmission en relief (concert, évènement sportif), le signal vidéo émis comporte 48 images / seconde (24 pour chaque œil). Le réglage de la polarité est déterminé à l'origine du signal par la société en charge de la captation et de la diffusion. Par rapport aux configurations du projecteur, il se peut parfaitement que la polarité soit inversée.

Dans ce cas, l'opérateur a plusieurs options techniques pour résoudre le problème. Tout d'abord, il peut changer le réglage sur les outils logiciels de commande du projecteur :

polarit_Christie

Réglage de polarité sur le Web Interface User (projecteur Christie)

S'il veut intervenir immédiatement sans passer par le logiciel, il peut également inverser la polarité sur le boitier de synchronisation si ce dernier possède une telle fonction :

boitier_phase_Real_D

Le bouton « Phase » sur le boitier Real D désigne le réglage de polarité

Enfin, s'il utilise un récepteur satellite directement branché en HD / SDI au projecteur, il peut aussi inverser les deux câbles. En effet, le câble A transporte l'image de l'œil gauche et le B celui de l'œil droit. En les inversant, cela revient à inverser la polarité.

branchement_christie_02_-_Copie_4

Dans ces conditions, le projectionniste peut assurer la retransmission dans de bonnes conditions techniques. Toutefois, à la fin de l'évènement, il faut veiller à remettre le réglage dans sa configuration initiale afin d'éviter de projeter des contenus cinéma numérique avec une polarité inversée.

Dans tous les cas, une vérification humaine ponctuelle ou constante évite les erreurs et permet d'assurer une qualité optimale pour le public.

(1) "La légende de Beowulf" est un film Warner Bros.

(2) "Tron Legacy" est un film Walt Disney

Mise à jour le Vendredi, 01 Février 2013 13:50
 

Commentaires  

 
+1 #3 Jean 10-05-2014 15:29
Le vrai soucis, c'est que la plupart des projectionnistes ont été licenciés :( c'est regrettable.

La qualité des projections est en constante baisse depuis quelques dizaines de mois ...

Il n'y a presque plus aucun entretien des machines et projecteurs en cabines.
Citer
 
 
+1 #2 manice 22-04-2012 12:02
Bonjour, si la polarité fait l'objet d'un article complet c'est que des salles continuent à faire des projections 3 D à la polarité inversée ce qui est incompréhensible et inacceptable.

Pour revenir au sujet, si votre question est de savoir s'il est possible d'accentuer ou de diminuer l'effet de relief grâce à un réglage sur le matériel de projection, la réponse est non. La stéréoscopie est conditionnée par la copie numérique (DCP), elle même issue de la post production du film. Le projectionniste ne peut pas modifier ce fichier.

Par contre, il y a des facteurs qui peuvent altérer la sensation de relief et sur lesquels le projectionniste a un rôlé à jouer :

- Niveau de luminosité (changement et / ou réglage du xénon).
- Respect du cadrage.
- Mise au point (netteté) vérifié.
- Contrôle de la polarité.

Des mires sont envoyées aux salles pour inciter les opérateurs à faire régulièrement ces vérifications.

Cordialement.
Citer
 
 
0 #1 question importante 22-04-2012 00:39
Le projectionniste peut-il agir sur la distance d'écartement sur l'écran des images projetées ?
Vous vous concentrez surtout sur la polarité, pourtant vue dans le paragraphe précédent.
Citer
 

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