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

摘要

An image decoding device for increasing decoding efficiency and reducing the number of memory accesses includes a division unit dividing a picture into first and second coded image data; and first and second decoding units decoding, in parallel, the first and second coded image data and storing decoding results into a frame storage unit. The first and second decoding units decode the first and second coded image data using second and first decoding result information, respectively, and store the resulting first and second decoding result information into an information storage unit. When decoding a target macroblock, each of the first and second decoding units performs image processing on the corresponding second or first decoding result information indicating part of the decoded macroblock included in the macroblock line adjacent to the macroblock line including the target macroblock, and the target macroblock.

主权项

1. An image decoding device that decodes coded image data including a coded picture having a plurality of first elements each of which has a plurality of second elements aligned in a row, the image decoding device comprising:
a division unit configured to divide the picture into first coded image data and second coded image data by assigning, at least for each of the first elements included in the picture, the first element as a part of one of the first coded image data and the second coded image data; and a first decoding unit and a second decoding unit configured to decode, in parallel, the first element included in the first coded image data and the first element included in the second coded image data, respectively, and store the decoded first elements into a frame storage unit, the first elements decoded by the first decoding unit and the second decoding unit being adjacent to each other in a same picture, wherein the first decoding unit is configured to: decode the first coded image data using second decoding result information stored in an information storage unit and store, as first decoding result information, a part of information generated as a result of the decoding into the information storage unit; and when decoding a target second element included in the first coded image data, perform image processing on the second decoding result information and the target second element and store at least a part of each of the image-processed target second element and the image-processed second decoding result information into the frame storage unit, the second decoding result information indicating at least a part of another second element that has been decoded by the second decoding unit and is included in another first element adjacent to the first element including the target second element, and the second decoding unit is configure 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 when decoding a target second element included in the second coded image data, perform image processing on the first decoding result information and the target second element and store at least a part of each of the image-processed target second element and the image-processed first decoding result information into the frame storage unit, the first decoding result information indicating at least a part of another second element that has been decoded by the first decoding unit and is included in another first element adjacent to the first element including the target second element.