Edge dedection application with FPGA based Sobel operator

Abstract

Özetçe-Genel bir yaklaşımla sayısal görüntü verilerinin analizi olarak tanımlanabilen görüntü işleme, birçok adımdan oluşmaktadır. Bunlardan biri olan kenar belirleme, farklı operatörler kullanılarak gerçekleştirilebilmektedir. Temel bir kenar belirleme operatörü olan Sobel operatörü, yüksek gürültü seviyelerinde daha az bozulma özelliğinden dolayı tercih edilmektedir. Bu çalışmada, Sobel operatörü ile kenar belirleme işlemi, donanım tabanlı olarak FPGA üzerinde gerçekleştirilmiştir. Sistem tasarımı için IEEE 754-1985 kayan noktalı sayı standardı ve VHDL donanım tanımlama dili kullanılmıştır. Çalışma frekansı 160 MHz olarak tasarlanan sistemde Xilinx Virtex-6 FPGA çipi kullanılmıştır. Sistemin başarım ölçütü için donanım istatistikleri değerlendirilmiştir. Anahtar Kelimeler -FPGA; sayısal görüntü işleme; kenar belirleme; Sobel operatörü; VHDL.Abstract-Image processing can be defined as analysis of the images consists of the several steps. The edge detection process that is one of these steps can be performed using a variety of operators. Sobel edge detection operator, is a basic operator, is preferred to use with high noisy images because its corruption is insensible on images. The proposed work presents an edge detection algorithm using Sobel operator based on FPGA architecture. Proposed system is designed using IEEE 754-1985 floating-point standard and VHDL hardware description language. Design is synthesized for Xilinx Virtex-6 FPGA chip with 160 MHz operating frequency. The performance is decreed according chip statistics.

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