Gradual video sequence transition detecting method for video coder/decoder, involves calculating criteria indicating if one distance is greater than another distance and making decision on image belongingness to transition based on criteria

摘要

#CMT# #/CMT# The method involves calculating a distance (C1) between an image (I(t-k)) and a mean image (Im) resulting from a mean calculation between an image (It) and an image (I(t-2k)). Another distance (C2) is calculated between the images (I(t-k), It) or between the images (I(t-k), I(t-2k)). A criteria (C) indicating if the distance (C2) is greater than the distance (C1) is calculated. A decision about the belongingness of the image (I(t-k)) to a gradual transition is made according to the criteria. #CMT# : #/CMT# Independent claims are also included for the following: (1) a video sequence coding method comprising transition detection phase (2) a computer program product comprising program code instructions for executing a transition detection method (3) a computer program product comprising program code instructions for executing a coding method (4) a storage unit storing a set of instructions executable by a computer for implementing a transition detection method (5) a storage unit storing a set of instructions executable by a computer for implementing a coding method (6) a video sequence transition detection device (7) a coding device comprising a video sequence transition detection device. #CMT#USE : #/CMT# Used in the field of video coder/decoder conforming to MPEG-4advanced video coding standard, for detecting gradual transition in a video sequence in applications such as automatic indexing of the video content by cutting of the sequence into scenes. #CMT#ADVANTAGE : #/CMT# The calculation of the criteria and the decision about the belongingness of the image permit to detect gradual transition in the video sequence in a simple and reliable manner. The method avoids the need to wait till the end of the gradual transition for deciding if the image belongs to the gradual transition or not, thus minimizing the processing delay so as to be compatible with real time applications. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows an analysis module of a coding device `(Drawing contains non-English language text)` It : Image.