VLSI Architecture Exploration of Guided Image Filtering for 1080P@60Hz Video Processing
Abstract: Guided image filtering (GIF) is a promising edge-preserving filtering technique that has been applied in a variety of applications. Nevertheless, an efficient very-large-scale integration (VLSI) architecture design of GIF is still very challenging for the real-time processing of full-high definition videos. Previously proposed architectures are somewhat inefficient in terms of either on-chip memory usage or off-chip memory bandwidth. This paper aims to improve the balance between on-chip memory usage and off-chip memory bandwidth through architecture exploration. Three critical architectural tradeoffs in the VLSI design of GIF are explored, and two efficient VLSI architectures, namely sequential line-based and parallel line-based architectures, are proposed. Experimental results demonstrate that the proposed VLSI design only consumes 34.1-K logic gates, 25.4-KB on-chip memories, and 373-MB/s off-chip memory bandwidth while achieving a real-time video processing of 1080P@60Hz at the maximum clock frequency of 297-MHz. Moreover, the proposed VLSI circuits are fully pipelined and synchronized to the pixel clock of output video, so can be seamlessly integrated into diverse real-time video processing systems.
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