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Terms of Use

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May 2021

French (Français)

Photographie de documents

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Guide de l'utilisateur

La numérisation n'est pas le seul moyen d'acquérir des images de vos documents. Vous pouvez reconnaître des photos de documents prises avec un appareil photo ou un téléphone portable. Il vous suffit de prendre une photo du texte, de l'enregistrer sur votre disque dur et de l'ouvrir dans ABBYY FineReader.

Lorsque vous prenez des photos de documents, vous devez tenir compte de plusieurs facteurs pour obtenir les meilleurs résultats de reconnaissance de la photo. Ces facteurs sont décrits en détails dans les sections suivantes :

Configuration requise pour l'appareil photo

Votre appareil photo doit répondre aux exigences suivantes en vue d'obtenir des images document pouvant être reconnues de manière fiable.

Caractéristiques recommandées pour l'appareil photo

Capteur d'image : 5 millions de pixels pour les pages de format A4. Des capteurs plus petits peuvent suffire pour prendre des photos de documents plus petits tels que les cartes de visite.
Fonction de désactivation du flash
Contrôle manuel du diaphragme, c'est-à-dire présence d'un mode manuel ou Av.
Mise au point manuelle
Un système anti-vibration ou la possibilité d'utiliser un trépied
Zoom optique

Configuration minimale

2 millions de pixels pour les pages de format A4.
Distance de focale variable.

Remarque : Pour obtenir des informations détaillées sur la configuration de votre appareil, reportez-vous à la documentation qui l'accompagne.

Éclairage

L'éclairage affecte considérablement la qualité de la photo obtenue.

Vous pouvez obtenir les meilleurs résultats avec une lumière claire et répartie de façon homogène, de préférence la lumière du jour. Par temps très ensoleillé, vous pouvez augmenter la valeur du diaphragme pour obtenir une image plus nette.

Utilisation du flash et de sources lumineuses supplémentaires

Lorsque vous utilisez un éclairage artificiel, utilisez deux sources lumineuses positionnées de façon à éviter les ombres ou les reflets.
S'il y a assez de lumière, éteignez le flash pour éviter d'avoir des blancs et des ombres prononcés. Lorsque vous utilisez le flash dans un environnement peu lumineux, veillez à prendre des photos à une distance d'approximativement 50 cm.

Important ! Le flash ne doit pas être utilisé pour prendre des photos de documents imprimés sur du papier brillant. Comparez une image comportant des reflets avec une image de bonne qualité

Si l'image est trop sombre

Définissez une valeur plus faible du diaphragme pour augmenter l'ouverture du diaphragme.
Définissez une valeur ISO plus élevée.
Utilisez la mise au point manuelle, étant donné que la mise au point automatique peut échouer lorsque les conditions d'éclairage sont mauvaises.

Comparez une image qui est trop sombre avec une image de bonne qualité :

Prise de photos

Pour obtenir des photos de documents de bonne qualité, assurez-vous de correctement positionner l'appareil photo et suivez ces simples recommandations.

Utilisez un trépied à chaque fois que c'est possible.
L'objectif doit être positionné parallèlement à la page. La distance entre l'appareil photo et le document doit être choisie de façon à ce que l'intégralité de la page soit parfaitement cadrée lorsque vous faites un zoom avant. Dans la plupart des cas, cette distance se situe entre 50 et 60 cm.
Aplanissez le document papier ou les pages du livre (en particulier s'il s'agit d'un livre épais). Les lignes de texte ne doivent pas être inclinées de plus de 20 degrés, dans le cas contraire, le texte risque de ne pas être converti correctement.
Pour obtenir des images plus nettes, effectuez la mise au point sur le centre de l'image.

Activez le système anti-vibration, car les expositions de longue durée dans un environnement où la lumière est de faible intensité peuvent flouter la photo.
Utilisez la fonction automatique du déclencheur d'obturateur. Cette fonction empêchera l'appareil photo de bouger lorsque vous appuyez sur le bouton Déclencheur d'obturateur. L'utilisation du déclencheur d'obturateur automatique est recommandé même si vous utilisez un trépied.

Comment améliorer une image, si :

l'image est trop sombre ou son contraste est trop faible.

Solution : Essayez d'améliorer l'éclairage. Si cela n'est pas possible, essayez de définir une valeur plus faible de diaphragme.

l'image n'est pas assez nette.

Solution : La mise au point automatique risque de ne pas fonctionner correctement dans un environnement où la lumière est de faible intensité ou lorsque vous prenez une photo à courte distance. Essayez d'utiliser un éclairage plus clair. Utilisez un trépied et un retardateur pour empêcher l'appareil de bouger lorsque vous prenez une photo.

Si l'image n'est que légèrement floutée, utilisez l'outil Correction de photos disponible dans l'Éditeur d'images. Pour plus d'informations, consultez la section "Édition manuelle des images."

une partie de l'image n'est pas assez nette.

Solution : Essayez de définir une valeur plus élevée du diaphragme. Prenez des photos à une plus grande distance avec un zoom optique maximal. Faites la mise au point entre le centre et les bords de l'image.

le flash génère des reflets.

Solution : Éteignez le flash ou essayez d'utiliser d'autres sources lumineuses et d'augmenter la distance entre l'appareil photo et le document.

14.01.2020 17:26:19

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