Computing inverse optical flow

[EN] We propose four algorithms for computing the inverse optical flow between two images. We assume that the forward optical flow has already been obtained and we need to estimate the flow in the backward direction. The forward and backward flows can be related through a warping formula, which allows us to propose very efficient algorithms. These are presented in increasing order of complexity. The proposed methods provide high accuracy with low memory requirements and low running times.In general, the processing reduces to one or two image passes. Typically, when objects move in a sequence, some regions may appear or disappear. Finding the inverse flows in these situations is difficult and, in some cases, it is not possible to obtain a correct solution. Our algorithms deal with occlusions very easy and reliably. On the other hand, disocclusions have to be overcome as a post-processing step. We propose three approaches for filling disocclusions. In the experimental results, we use standard synthetic sequences to study the performance of the proposed methods, and show that they yield very accurate solutions. We also analyze the performance of the filling strategies. 

Resiliencia, optimismo y burnout en judokas de competición uruguayos

[ES] Son escasos los estudios de resiliencia en contexto deportivo, siendo este un proceso que corresponde a un funcionamiento psicológico óptimo en los deportistas y representa una característica de la personalidad positiva que favorece su adaptación afrontando eficazmente las adversidades. El análisis de la relación entre resiliencia, optimismo y burnout puede establecer nuevas aportaciones. Es objeto de este estudio caracterizar estos constructos en judokas. Fueron evaluados 45 deportistas (9 mujeres y 36 hombres; edad:M =19.95,DT= 5.34). Los resultados señalan que el 38% de los judokas presenta una elevada resiliencia, con una significativa y negativa relación con sintomatología de burnout, relacionada con bajo optimismo. Se establece la Escala de Resiliencia (Ruíz, De la Vega, Poveda, Rosado y Serpa, 2012) como confiable y se concluye que resiliencia asociada a optimismo protege de sintomatología de burnout. Este trabajo facilita la elaboración de estrategias de intervención para el logro de un rendimiento óptimo deportivo.

An evolutive approach for smile recognition in video sequences

Facial expression recognition is one of the most challenging research areas in the image recognition ¯eld and has been actively studied since the 70's. For instance, smile recognition has been studied due to the fact that it is considered an important facial expression in human communication, it is therefore likely useful for human–machine interaction. Moreover, if a smile can be detected and also its intensity estimated, it will raise the possibility of new applications in the future