Anti-noise Sobel Edge Detection Algorithm and Its Hardware-accelerated Design
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Aiming at the application requirement of real-time edge detection in image sequences,an anti-noise Sobel edge detection algorithm is proposed,and its hardware-accelerated design is developed.The algorithm structure is optimized by replacing two-dimensional median filter with separate median filter and improving the computation of the magnitude and orientation of the gradient.Several measures such as improving the hardware architecture of separate median filter,storing the temporary data to avoid computing repeatedly and calculating the magnitude and orientation of the gradient in parallel are taken to improve the real-time performance and reduce the hardware resources cost.Simulation results of ModeSim and the synthesis report of ISE illuminate that the hardware-accelerated can accclerate the speed and reduce the hardware resources consumption.The proposed algorithm performs better in noise immunity and edge detection performance.