Efficient down-scaling of dct compressed images

G - Physics – 06 – F

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G06F 17/14 (2006.01) G06T 3/40 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01)

Patent

CA 2336255

In a method and a device for calculation of the Discrete Cosine Transform (DCT) only the DCT coefficients representing the first half and the second half of an original sequence are required for obtaining the DCT for the entire original sequence. The device and the method are therefore very useful when calculations of DCTs of a certain length are supported by hardware and/or software, and when DCTs of other sizes are desired. Areas of application are for example still image and video transcoding, as well as scalable image and/or video coding and decoding.

Dans un procédé et un dispositif servant à calculer une transformation en cosinus discrets (DCT), seuls les coefficients de DCT représentant la première moitié et la deuxième moitié d'une séquence originale sont nécessaires pour obtenir la transformation en cosinus discrets pour la totalité de la séquence originale. Ce dispositif et ce procédé sont, par conséquent, très utiles quand des calculs de transformations en cosinus discrets d'une certaine longueur sont effectués par une machine et/ou un logiciel et quand on désire obtenir des transformations en cosinus discrets d'autres dimensions. Des domaines d'application consistent, par exemple, en transcodage d'images fixes et d'images vidéo, ainsi qu'en codage et décodage d'images et/ou de vidéo échelonnables.

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