Image processing device, decoding method, intra-frame decoder, method of decoding intra-frame and intra-frame encoder

摘要

Adopted is a decoder, in which on condition that a prediction block shown by vector information extracted from a data stream, and a decode-target block have an overlap where respective pixels overlay each other, pixel information of an already-decoded portion at a distance of an integer multiple of a vector provided by the vector information from the overlap is made a prediction signal instead of the overlap, and the prediction signal is added to difference image data taken from the data stream to generate reproduction image data. The decoder is adopted for an intra-frame decoder, a local decoder of an encoder, and the like. According to a fundamental rule concerning a repetitive pattern of an image, a pixel at a distance of an integer multiple is a like pixel, and therefore the process of decoding can be performed efficiently.

主权项

1. An image processing device comprising:
a decoder receiving intra-frame prediction direction from an encoder using directional intra-frame prediction decoding, wherein, on condition that a prediction block, generated by vector information extracted from a data stream provided by the encoder, and a decode-target block have an overlap region, the overlap region containing pixels of the prediction block and pixels of the decode-target block, the decoder uses as a prediction signal pixel information of an already-decoded portion located at a distance from the overlap region, the distance being that of an integer multiple of a size of a first vector, the first vector indicating a relative position from a pixel of the decode-target block to a corresponding pixel of the prediction block and being provided by the vector information, and adds the prediction signal to difference image data taken from the data stream to generate reproduction image data of the decode-target block,
wherein the prediction block, the decode-target block, and the overlap region are located in the same image frame, and the prediction block is used by the decoder to predict the decode-target block, andwherein the pixel information of said already-decoded portion is used as replacement of the pixel information of the overlap portion of the prediction block as part of the prediction signal.