1999 Fiscal Year Final Research Report Summary
Video encoding processor LSI for multimedia
| Project/Area Number |
10650343
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
電子デバイス・機器工学
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| Research Institution | Chuo University |
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Principal Investigator |
ENOMOTO Tadayoshi CHUO UNIVERSITY, 理工学部, 教授 (10245988)
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| Project Period (FY) |
1998 – 1999
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| Keywords | MPEG-2 / motion-estimation / PSNR / full-search algorithm / breaking-off-search / CMOS process / power dissipation / modified breaking-off-search / Video signal processor |
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| Research Abstract |
For fast MPEG-2 encoding, a fast motion-estimation (ME) algorithm, called the "breaking-off-search (BOS)" algorithm, was developed in 1998. The number of computations is drastically reduced by introducing computational constraints in a conventional fun-search (FS) algorithm. By improving the BOS algorithm, "modified breaking-off-search (MBOS)" was also developed in 1999. The MBOS algorithm with threshold values, which are adaptively assigned, can increase processing speed by a factor of 3.4. It can not only keep the same visual quality as that of the FS method, but can sometimes achieve a higher PSNR than FS. The MBOS algorithm can eliminate serious degradations of picture quality and speed associated with BOS due to the presence of scene changes. Furthermore, a drastic speed improvement substantially reduces the power dissipation of the ME array. A 40.5-MHz, 2.5-V, ME test chip using the MBOS method was fabricated by using the 0.6-μm CMOS process. The measured power dissipation was reduced to 410 mW, which is about 1/14 that of the ME-array using FS.
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