Compressed domain video text overlay for multimedia...

H - Electricity – 04 – N

Patent

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H04N 5/272 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/52 (2006.01)

Patent

CA 2200121

Novel techniques for overlaying a message onto a video image in the compressed domain. The video image is represented as a compressed, digitized video bit stream. The message is digitized and compressed to form a coded message. The coded message is combined with the compressed, digitized video bit stream to generate an output video bit stream representing the video image with a message overlay. The message may consist of text, alphanumeric characters, numbers, status indicators, symbols, and/or icons.

L'invention est constituée par des méthodes nouvelles de superposition de messages sur des images vidéo comprimées. L'image vidéo est représentée sous la forme d'une chaîne binaire vidéo numérique comprimée. On numérise le message et on le comprime afin de former un message codé. Ce message codé est combiné à la chaîne binaire vidéo numérique comprimée pour donner une chaîne binaire vidéo représentant l'image vidéo avec le message superposé. Le message peut être constitué d'un texte, de caractères alphanumériques, de nombres, d'indicateurs de situation, de symboles et/ou d'icônes.

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