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VLSI Implementation of Edge Detector and Vector Quantizer for Very Low Bitrate Video Encoding
Miyanohana, Koji,Fujita, Gen,Onoye, Takao,Shirakawa, Isao 대한전자공학회 1996 APCCAS:Asia Pacific Conference on Circuits And Sys Vol.1 No.1
A VLSI video encoder core is implemented dedicatedly for a very low bitrate coding, with the main theme focused on an edge detector and a vector quantizer. A new mechanism is devised so as to seek horizontal and vertical edges simultaneously, which can achieve a high throughput for the edge detector. A new scheme is also introduced into the PE (Processing Element) array so as to be shared by the vector quantizer and the motion estimator. Owing to these sophisticated concepts, specific functional macrocells have been implemented for the edge detector and vector quantizer in the total area of 55.3㎟ by a 0.6㎛ triple-metal CMOS technology.
Improvement in Bottom Detection for Hydroacoustic Assessment of Demersal Fish
Hwang, Doo Jin,Iida, Kohji,Takao, Yoshimi,Miyanohana, Yoichi,Sawada, Kouichi,Okumura, Tsuyoshi 한국수산자원학회 1998 한국수산자원학회지 Vol.1 No.1
Due to the importance of bottom detection method for defining an integration layer with the bottom as a reference basis, some theoretical elements which form bottom echoes during acoustic survey of demersal fish were considered. A stable bottom detection method based on maximum voltage difference, which was not influenced by variable levels and waveform transformation. The method has been shown to be effective using in-situ bottom echo waveforms and computer simulation data. A comparison between near-bottom SV profiles acquired in Funka Bay, Hokkaido, of Japan and the East China Sea, with the threshold method and maximum differential voltage method, shows that the SV obtained with the maximum differential voltage method is 46 dB higher than those with threshold method within 2m from the bottom.