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Low-power motion vector estimation using iterative search block-matching methods and a high-speed non-destructive CMOS image sensor

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4 Author(s)
Kawahito, Shoji ; Res. Inst. of Electron., Shizuoka Univ., Hamamatsu, Japan ; Handoko, D. ; Tadokoro, Y. ; Matsuzawa, A.

In this paper, motion vector (MV) estimation methods with high-speed intermediate pictures for low-power video compression are proposed. The intermediate pictures are obtained by a special type of CMOS image sensor. An adaptive iterative-search block matching is proposed to obtain precise MVs of video-rate pictures from high-speed intermediate pictures with the reduced computational complexity. The sensor captures high-speed intermediate pictures without destructing signal charge and video-rate pictures with full signal accumulation time. The proposed active pixel sensor using bidirectional multiple charge transfer is useful for the nondestructive intermediate imaging with a reduced fixed pattern noise. The image sensor chip has been implemented by using 0.35-μm CMOS technology. It operates with 3.3 V and captures 480 frames/s high-speed nondestructive intermediate pictures and 30 frame/s fully accumulated video-rate pictures. The proposed adaptive iterative-search block matching has a comparable precision to a full search block matching with reduction of computational complexity by a factor of about 1/13, on average. It also reduces the data-loading rate from the memory by a factor of about 1/4.

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Circuits and Systems for Video Technology, IEEE Transactions on  (Volume:12 ,  Issue: 12 )