Detection of transitions in video sequences

H - Electricity – 04 – N

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H04N 5/14 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01)

Patent

CA 2311662

Frame dissimilarity measure (FDM) values are generated (102) for pairs of frames in a video sequence that are separated by a specified timing window size, where each FDM value is the ratio of a net dissimilarity measure and a cumulative dissimilarity measure. In one embodiment, a first threshold condition (110) is applied to identify peaks in the FDM data that could correspond to transitions between shots in a video sequence. A second threshold condition (116) is applied to the FDM data adjacent to the detected peaks to identify frames at the start and end of the transition. The first threshold condition determines whether the FDM values exceed a first specified threshold level, while the second threshold condition determines whether the FDM values fall below a second specified threshold level. The net and cumulative dissimilarity measures may be based on histograms for the two frames. The present invention is effective in detecting gradual transitions between shots, such as wipes, dissolves and fades, as well as abrupt transitions, such as cuts.

Il est possible de mesurer (102) les valeurs des dissimilarités entre paires de trames (FDM) d'une séquence vidéo qui sont séparées par la taille d'un créneau temporel donné, chacune desdites valeurs étant le rapport d'une valeur de dissimilarité nette, et d'une valeur de dissimilarité cumulée. Dans l'une des exécutions on applique une première condition de seuil (110) pour identifier les pics des données FDM pouvant correspondre à des transitions entre les plans d'une séquence vidéo. On applique ensuite une deuxième condition de seuil (116) aux données FDM voisines des pics détectés pour identifier les trames se trouvant au début et à la fin de la transition. La première condition de seuil détermine si les valeurs FDM tombent en deçà d'un deuxième seuil donné. Les mesures nettes et cumulées des dissimilarités peuvent se baser sur les histogrammes des deux trames. L'invention s'avère efficace pour la détection des transitions progressives entre plans telles que les effets de volet, les fondus et les fondus enchaînés, ainsi que celle des transitions abruptes telles que les coupures.

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