Down scaling of images

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G - Physics

06

F

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 2283779

Overfeed burner with controllable output for solid fuels, such as chips or coal, comprising a combustion chamber (2), downwardly delimited by a grate (3), a burner pipe (14) for unburned gases connected to the combustion chamber, and means for supplying primary and secondary air. Distinguishing features are that the grate (3) is horizontally rotatable and vertically movable for changing the volume of the combustion chamber (2), that a restrictable secondary air inlet (16) and a damper (13), which is equipped with a controllable secondary air inlet (15), are arranged in the passage (12) between the combustion chamber and the burner pipe, and a controllable fan (21) for feeding combustion air. A method of operation includes lowering the output by lowering the speed of the fan (21), then throttling the passage (12) between the combustion chamber and the burner pipe, reducing the supply of secondary air, reducing the rotation speed of the grate (3) and closing a damper (23) for over-fire air.

Dans un procédé et un appareil servant à calculer la transformée en cosinus discrets (TCD) seuls les coefficients de la TCD représentant la première moitié et la deuxième moitié d'une séquence de départ sont nécessaires pour obtenir la TCD de la totalité de la séquence de départ. Ce procédé et cet appareil sont par conséquent très utiles lorsque le calcul des TCD d'une certaine longueur est mis en oeuvre de façon matérielle et/ou logicielle, mais lorsque des TCD d'autres tailles sont désirées. Les domaines d'application sont par exemple le transcodage d'images fixes et le transcodage vidéo ainsi que le codage d'image dont l'échelle peut être réduire et/ou le codage vidéo.

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