Proc. SPIE. 5667, Color Imaging X: Processing, Hardcopy, and Applications
KEYWORDS: Microelectromechanical systems, Digital signal processing, Image processing, Scanners, Printing, Data processing, Signal processing, Algorithm development, Digital electronics, Data integration
This paper describes a high-performance scalable SIMD digital signal processor (DSP) developed for multifunctional printer systems. The proposed DSP supports a variable number of datapaths to cover a wide range of performance and maintains a RISC-like pipeline structure. Many special instructions suitable for image processing algorithms are included in the DSP. Various quad/dual instructions are supported to pack four data of byte length or two data of half-word length into one word length form. To process image data that have various bit-lengths, the proposed DSP is able to perform bit-field extraction/insertion before and after ALU operations. The DSP supports up to 4 extraction/insertion patterns at the same time, and one of them can be specified in the related instruction. Conditional instructions are supported to deal with complex relative conditions efficiently. In addition, an intelligent DMA block is integrated to align data in the course of data reading, because the alignment function can be implemented with a little hardware. Experimental results on typical image processing algorithms show that the proposed SIMD DSP is two times effective in performance compared to a commercial high-end DSP.