A Custom Image Convolution DSP with a Sustained Calculation Capacity of 1 GMAC/s and Low I/O Bandwidth

  • Authors:

  • Viktor öwall;Mats Torkelson;Peter Egelberg

  • Affiliations:

  • Department of Applied Electronics, Lund University, Box 118, 221 00 Lund, Sweden;Department of Applied Electronics, Lund University, Box 118, 221 00 Lund, Sweden;AgroVision AB, 223 70 Lund, Sweden

  • Venue:
  • Journal of VLSI Signal Processing Systems - Special issue on spatiotemporal signal processing with analog CNN visual microprocessors
  • Year:
  • 1999

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Abstract

A customized processor for real time image convolution hasbeen designed to increase the performance of an instrument forautomated cereal grain quality assessment. Image convolutionrequires an extensive amount of calculation capacity and acorresponding amount of data transfers, hard to achieve with standardprocessors in real time. Therefore, a tailored architecture with astreamlined dataflow has been developed with emphasis on a systemdesign perspective. The designed processor has a sustainedcalculation capacity of 1 GMAC/s and on-chip line buffers reducethe amount of external data transfers. Hence, the complexity of thedesigned processor has been increased to gain a lower complexity ofthe complete system. To achieve powerful and versatile filtering thesize of the programmable kernel functions have been maximized to15 × 15.