Patent ID: 6526177
Filing Date: 2003-02-25
Classification: H04N

Abstract:
A data coding method comprising:identifying a video object from source video data, coding the video object in a base layer and an enhancement layer, the base layer containing a complete but coarse representation of the video object and the enhancement layer containing supplementary information regarding the video object coded with respect to the base layer representation, transferring data of the enhancement layer to a channel according to a syntax that comprises: No. ofSyntaxBitsVideo Object Layer( ){â€ƒvideo_object_layer_start_code28â€ƒlayer_id4â€ƒscalability|â€ƒif (scalability){â€ƒâ€ƒref_layer_id4â€ƒâ€ƒref_layer_sampling_direc1â€ƒâ€ƒhor_sampling_factor_n5â€ƒâ€ƒhor_sampling_factor_m5â€ƒâ€ƒvert_sampling_factor_n5â€ƒâ€ƒvert_sampling_factor_m5}}â€ƒwherein: video_object_layer_start_code is a code that indicates an onset of a video object layer; layer_id is a code that uniquely identifies the video object layer; scalability is a 1-bit flag that indicates whether scalability is used for coding of the video object layer; ref_layer_id is a code that uniquely identifies a decoded layer to be used as a reference for predictions made in the enhancement layer; ref_layer_sampling_direc is a 1-bit flag whose value, when â€œ0,â€  indicates that the decoded layer specified by ref_layer_id has the same or lower resolution as the layer being coded and, when â€œ1,â€  indicates that the resolution of the decoded layer is higher than the resolution of layer being coded resolution; hor_sampling_factor_n, hor_sampling_factor m are 5bit quantities in range 1 to 31 whose ratio hor_sampling_factor_n/hor_sampling_factor_m indicates resampling needed in horizontal direction; vert_sampling_factor_n, vert_samplingâ€”factor_m are 5bit quantities in range of 1 to 31 whose ratio vert_sampling_factor-n/vert_sampling_factor_m indicates resampling needed in vertical direction.