Envivio France

Tanguy Person

Thomas Guionnet

Jean Kypreos

Michael Ropert

A real time encoder with bit rate constraint, of the type including: a capture buffer memory storing frames waiting to be processed; an encoding module receiving frames issued from the capture buffer memory and delivering compressed frames; an intermediate buffer memory, storing the compressed frames issued from the encoding module; and an emission buffer memory, storing data packets, resulting from the division of the compressed frames issued from the intermediate buffer memory, and emitting, with a controlled bit rate, the data packets on a communication channel. The encoder includes a control module, which dynamically adjusts the maximum size of the capture buffer memory, permitting the maximum size of the capture buffer memory to be temporarily increased as long as the emission buffer memory is not empty.

Real time encoder with time and bit rate constraint, method, computer program product and corresponding storage means

Method and apparatus for detecting transitions in a video sequence, which include detecting an abrupt transition including, for each image Iincluded in said video sequence and with a processing time rank t&#x2212;2k: calculating a first distance D(I), between an image Iand a reference image for said image I, which precedes said image Iin the video sequence; calculating a second distance D(I), between an image Iand a reference image for said image I, which precedes said image Iin the video sequence; calculating a third distance D(I), between an image Iand a reference image for said image I, which precedes said image Iin the video sequence; calculating a criterion C' indicating whether said second distance D(I) is significantly greater than the largest of the first and third distances, D(I) and D(I); deciding, according to said criterion C&#x2032;, on the belonging of the image Ito an abrupt transition.

Method and device for detecting transitions in a video sequence, method and device for coding, computer program products and corresponding storage means

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Rennes, France

Tanguy Person