Image decoding device, image coding device, methods thereof, programs thereof, integrated circuits thereof, and transcoding device

摘要

An image decoding device which increases decoding efficiency and can be easily implemented includes: a division unit dividing coded image data into first and second coded image data; a frame storage unit; first and second decoding units decoding, in parallel, the first and second coded image data; and an information storage unit. The first decoding unit decodes the first coded image data using second decoding result information stored in the information storage unit and stores, as first decoding result information, a part of information generated by the decoding into the information storage unit. The second decoding unit decodes the second coded image data using the first decoding result information stored in the information storage unit and stores, as the second decoding result information, a part of information generated by the decoding into the information storage unit.

主权项

1. An image decoding device that decodes coded image data including a coded picture having a plurality of block lines, each of the block lines having a plurality of blocks aligned in a row, the image decoding device comprising:
a first storage unit configured to store the coded image data; a division unit configured to divide the coded picture into first coded image data and second coded image data by assigning, at least for each of the block lines of the coded picture included in the coded image data, the block line as part of one of the first coded image data and the second coded image data; a second storage unit configured to store the first coded image data; a third storage unit configured to store the second coded image data; a frame storage unit; a first decoding unit and a second decoding unit configured to decode, in parallel, (i) a first block line from among the block lines included in the first coded image data and (ii) a second block line from among the block lines included in the second coded image data, respectively, and store the decoded first block line and the decoded second block line into the frame storage unit, the first block line decoded by the first decoding unit and the second block line decoded the second decoding unit being adjacent to each other in the picture; and an information storage unit configured to store first decoding result information and second decoding result information to be used in the decoding performed by the first and second decoding units, wherein the first decoding unit is configured to decode the first coded image data using the second decoding result information stored in the information storage unit and store, as the first decoding result information, a part of information generated as a result of the decoding into the information storage unit, the second decoding unit is configured to decode the second coded image data using the first decoding result information stored in the information storage unit and store, as the second decoding result information, a part of information generated as a result of the decoding into the information storage unit, and the first and second decoding result information stored in the information storage unit is generated as a result of decoding a picture that is currently being decoded by the first and second decoding units.