Hitachi Information & Telecommunication Engineering, Ltd.

Yoshimasa Kashihara

Hironori Komi

Yusuke Yatabe

Kyohei Unno

Toshikazu Yanagihara

Hiroshi Kojima

Mitsuhiro Okada

Yuusuke Yatabe

Kazunori Saito

Yoshiyuki Motoba

Toshiaki Hori

The present invention makes moving-image coding and decoding with low power consumption possible even when a Context-based Adaptive Binary Arithmetic Coding (CABAC) process is used. A preprocess for coding an image is executed for each macro block (MB), the MB information that is the result of the process is written into a storage unit in the order in which the MBs were processed, and the MB information stored in the storage unit is read out in order of raster and the MBs are coded. When the coded image is decoded, the MBs constituting the coded image are decoded in order of raster, the MB information that is the result of the decoded process is stored in the storage unit, and a decoded information readout process that is a post-process for decoding the image is executed in the order in which the MBs were processed.

Moving image coding device, moving image decoding device, moving image coding method, and moving image decoding method

An image compression/decompression device achieving increased utilization efficiency of the memory bandwidth in the access to the memory used for the compression/decompression operation while maintaining ill effect on the images at a low level is realized. The image compression/decompression device comprises a data conversion unit which reduces the data access rate when original images (as input images at the time of performing the compression) and reference images (used for performing the interframe prediction) are stored in the memory by accessing the memory. The access to the memory is performed in an address sequence (order) that differs between data write and data read. This makes it possible to increase the utilization efficiency of the memory bandwidth, and further to reduce the capacity of the buffer memory used for the data read.

Video image compression/decompression device

An image encoding apparatus is provided which realizes an encoding process at a high bit rate without degradation in image quality at boundary parts within a picture. The image encoding apparatusincludes: a plurality of entropy encoding sectionsandfor generating bit streams by entropy-encoding intermediate data generated from syntax elements of image data; and an encoding control sectionfor supplying the intermediate data to any of the entropy encoding sections. The encoding control sectiondetermines the entropy encoding section that performs an entropy encoding process by a frame in accordance with the processing status of each of the entropy encoding sections.

Image encoding apparatus

Growing community of inventors

Yokohama, Japan

Yoshimasa Kashihara