Method for prediction coding using scalable video codec

A method for prediction coding using scalable video codec, the method comprising:

• setting a target layer of an image, by a server, based on information about a device, if a service of the image is requested by the device;
• performing, by a server, a chrominance space conversion on an image signal of a base layer of the image using a chrominance space conversion equation preset in a scalable video codec selectively according to whether the chrominance space conversion is required in inter-layer prediction coding between the base layer and the target layer;
• and
• performing, by a server, the inter-layer prediction coding through an additional signal conversion based on necessary any one of spatial scalability, chroma-format scalability and bit-depth scalability wherein the chrominance space conversion equation is the following equation,
• (
• Y
• ⁢
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• 1
• Y
• ⁢
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• 2
• Y
• ⁢
• ⁢
• 3
• )
• =
• (
• K
• 1
• K
• 2
• K
• 3
• K
• 4
• K
• 5
• K
• 6
• K
• 7
• K
• 8
• K
• 9
• )
• ×
• (
• X
• ⁢
• ⁢
• 1
• -
• a
• 1
• X
• ⁢
• ⁢
• 2
• -
• a
• 2
• X
• ⁢
• ⁢
• 3
• -
• a
• 3
• )
• where the (Y1, Y2, Y3) is a chrominance space and (X1, X2, X3) is another chrominance space,
• wherein the K1 to K9 and a1 to a3 coefficients are integer coefficients to which image parameter coefficients of a Video Usability Information (VUI) of a Sequence Parameter Set (SPS) or a Picture Parameter Set (PPS) in an information area of a video stream of the base layer are integerized.