Hitachi Information & Telecommunication Engineering, Ltd.

Toshikazu Yanagihara

Hironori Komi

Yusuke Yatabe

Kyohei Unno

Yoshimasa Kashihara

Hiroshi Kojima

Mitsuhiro Okada

Yoshiyuki Motoba

Toshiaki Hori

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

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Yokohama, Japan

Toshikazu Yanagihara