Three-Dimensional Discrete Wavelet Transform (DWT) Based On Unary Arithmetic

This paper presents a three-dimensional discrete wavelet transform (DWT) for image processing based on unary arithmetic. The upper layer on-chip camera provides the input to the lower 3D-DWT processor layer utilizing Through Silicon Via (TSV) interconnections technology for data and signal transfers. Stacking of chips allow for low power operation since the inter-chip drivers are no longer necessary. For the same performance, the silicon area for 3D is smaller than the equivalent 2D architecture. The unary arithmetic has the potential for lowering the computational power as the results of significantly lower signal transitions than the corresponding binary operation. The proposed 3DDWT architecture combined with CMOS image sensor (CIS) based on unary processing can compress high definition images at lower power consumption, providing higher performance than the corresponding 2D-DWT and binary processing.