IEEE Trans Image Process - Lip segmentation under MAP-MRF framework with automatic selection of local observation scale and number of segments.

Tópicos

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Resumo

This paper addresses the problem of segmenting lip region from frontal human face image. Supposing each pixel of the target image has an optimal local scale from the segmentation viewpoint, we treat the lip segmentation problem as a combination of observation scale selection and observed data classification. Accordingly, we propose a hierarchical multiscale Markov random field (MRF) model to represent the membership map of each input pixel to a specific segment and local-scale map simultaneously. Subsequently, lip segmentation can be formulated as an optimal problem in the maximum a posteriori (MAP)-MRF framework. Then, we present a rival-penalized iterative algorithm to implement the segmentation, which is independent of the number of predefined segments. The proposed method mainly features two aspects: 1) its performance is independent of the predefined number of segments, and 2) it takes into account the local optimal observation scale for each pixel. Finally, we conduct the experiments on four benchmark databases, i.e. AR, CVL, GTAV, and VidTIMIT. Experimental results show that the proposed method is robust to the segment number that changes with a speaker's appearance, and can enhance the segmentation accuracy by taking advantage of the local optimal observation scale information.

Resumo Limpo

paper address problem segment lip region frontal human face imag suppos pixel target imag optim local scale segment viewpoint treat lip segment problem combin observ scale select observ data classif accord propos hierarch multiscal markov random field mrf model repres membership map input pixel specif segment localscal map simultan subsequ lip segment can formul optim problem maximum posteriori mapmrf framework present rivalpen iter algorithm implement segment independ number predefin segment propos method main featur two aspect perform independ predefin number segment take account local optim observ scale pixel final conduct experi four benchmark databas ie ar cvl gtav vidtimit experiment result show propos method robust segment number chang speaker appear can enhanc segment accuraci take advantag local optim observ scale inform

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