Patent ID: 7228001
Filing Date: 2007-06-05
Classification: H04N

Abstract:
1. A processor-implemented image coding method for dividing a frame image into blocks of a specific size and coding image data for each of the blocks to form a coded image that is configured to be decoded and then displayed by a device, the method comprising: a transform step of preparing image data that is a coded object by performing a predetermined data transform operation for respective images of the blocks in the frame image; and a coding step of subjecting the image data to variable-length coding by arithmetic coding using a predetermined probability table and of generating coded data having a hierarchy structure composed of a slice layer made of a plurality of the blocks, and a frame layer which is made of one or a plurality of the slice layers and corresponds to the frame image, wherein in the coding step, the presence of initialization of the probability table is set for the slice layer, a flag indicating the set presence of the initialization is added to a header of a predetermined layer of the coded data including the slice layer, and the probability table is initialized when the initialization is set to be present, and said coded image is configured to be transmitted to the device for seubsequent decoding and displaying.