Digital Integrated Circuit For Extracting Features Out Of An Input Image Based On Cellular Neural Networks

摘要

Digital integrated circuit (IC) for extracting features out of input image is disclosed. The IC contains one or more identical cellular neural networks (CNN) processing engines operatively coupled to at least one I/O data bus. Each CNN processing engine includes a CNN processing block, a first set of memory buffers for storing imagery data and a second set of memory buffers for storing filter coefficients. CNN processing block is configured to simultaneously perform 3×3 convolutions at M×M pixel locations using received imagery data and corresponding filter coefficients. Imagery data represents a (M+2)-pixel by (M+2)-pixel region of the input image. CNN processing block further performs rectification and/or 2×2 pooling operations as directed. When two or more CNN processing engines are configured on the IC, CNN processing engines are connected to one another as a loop via a clock-skew circuit for cyclic data access. M is a positive integer.