This thesis is concerned with a novel local threshold segmentation algorithm for digital images incorporating shape information. In image segmentation, most local threshold algorithms are based only on intensity analysis. In many applications where an image contains objects with a similar shape, in addition to the intensity information, some prior known shape attributes could be exploited to improve the segmentation. The goal of this work is to design a local threshold algorithm that includes shape information to enhance the segmentation quality. The algorithm adaptively selects a local threshold. Shape attribute distributions are learned from typical objects in ground truth images. Local threshold for each object in an image to be segmented is chosen to maximize probabilities in these shape attributes distributions. Then for the application of the oil sand image segmentation, a supervised classifier is introduced to further enhance the segmentation accuracy. The algorithm applies a supervised classifier trained by shape features to reject unwanted fragments. To meet different image segmentation intents in practical applications, we investigate a variety of combination of shape attributes and classifiers, and also look for the optimal one. Experiments on oil sand images have shown that the proposed algorithm has superior performance to local threshold approaches based on intensity information in terms of segmentation quality.

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La question des effets des actions promotionnelles sur la perception et sur l’intention d’achat du consommateur a marqué son emprunte dans la littérature. Généralement, les chercheurs l’ont traitée de deux manières. Certains d’entre eux ont étudié l’influence globale de la promotion sur le consommateur. D’autres ont exploré l’influence des techniques promotionnelles sur le consommateur. En revanche, jusqu’à présent, le packaging promotionnel n’a pas fait l’objet de véritables investigations dans la littérature. Ce travail tente alors (1) d’explorer ce volet de la promotion, (2)identifier aussi les attributs du packaging promotionnel qui interviennent dans le traitement de la promotion et (3) vérifier l'existence ou non d'un packaging promotionnel efficace en termes d'intentions comportementales. A la lumière de ces objectifs nous aboutirons à notre but principal de notre recherche soit : expliquer les effets du packaging promotionnel sur l'attitude et sur les intentions comportementales du consommateur. / In the context of sales promotions, promotional packaging – that is, the packaging of promoted products- reveals as one of the most relevant elements that retailers and brands work on to make the products more attractive and stimulate consumer’s purchase intention. While research on the topic is lacking, this research aims to:1/ to propose a theoretical framework allowing the identification of the attributes of the promotional packaging which leads to a definition of the notion of promotional packaging.2/to study the effects of the perceived value of the promotion (through promotional packaging) on ​​the attitude towards the promotional packaging and on the consumer's purchasing intentions. Promotional packaging, which has been included in the study survey, is based on a study conducted on 145 promotional packagings offered by a French distributor in 2013. Based on a multiple correspondence analysis (MCA), the existence of 6 main types promotional packaging is revealed.3/to check if there is a promotional packaging more efficient compared to others in terms of relations between the promotion's perceived value , attitude and behavioral purchase intentions.The results of the study conducted with 299 consumers confirm the existence of effects of the perceived value of the promotion materialized by the promotional packaging on the attitude towards promotional packaging and the behavioral purchase intentions of the product in promotion. . Theoretical, methodological and managerial contributions are then discussed.