Browsing by Author "Lan, YJ"

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Three-dimensional PAC video codec for wireless data transmission
(2000-12-01)
Wen, KA
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Chen, AY
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Lan, YJ
;
Lin, JL
;
Lin, CH
A newly derived algorithm called three-dimensional polynomial approximation coding (3DPAC) is being utilized in the applications of wireless video transmission. After combining the spatial and temporal domain, the video data is organized in a cube form, which has the features of processing parallelism and great compression ratio. Such a very low bit-rate video codec is able to support the wireless data transmission with a bit rate lower than 9.6 kbits/s, The system architecture will be presented and an experimental demonstration is also shown. For a video sequence of 176 x 144 frame size, PSNR up to 35 dB maybe obtained under 6.5 kbits/s transmission rate.
Three-dimensional regression polynomial coding for video transmission
(1998)
Lan, YJ
;
Chen, AY
;
Lin, JL
;
Wen, KA
;
電子工程學系及電子研究所
Video processing always needs excessive computation which may cause large computing time and thus demands for heavy computing power, it also needs large storage resources and high bandwidth communication channel. Hence, the major objective of video signal processing is to reduce the amount of data computation and use the limited resource bandwidth to handle it. Regression Polynomial Coding (RPC) is a new compression method based on polynomial coefficients which shapes out the waveform of the block. The computation mechanism employed greatly reduce the computation with serial but not parallel processing, and it is proved that RPC is effective and suitable in low bit rate applications in the environment with limited bandwidth. With the aid of variable length coding to gain more compression, RPC would be a great technique for wireless communications.