FPGA Based Approach for Impulse Noise Suppression using Adaptive Median Filter Architecture

Ayesha Nasreen, P Scholar, Abdul Wasay
unpublished
It is important to remove or minimize the degradations noises in valuable blurred color images. The traditional available filtering methodologies are applicable for fixed window dimensions only these are not applicable for varying scale images. In our project, we propose a new technique for digital image restoration, in this the noise free and noisy pixels are classified based on empirical multiple threshold values. Then the median filtering technique is applied. So, that noise free pixels are
more » ... etting preserved and only noisy pixels get restored. In this paper, an Adaptive median filter, called the Decision based filter (MDBUT) filter, is proposed to restore images corrupted by salt-pepper impulse noise. The filter is based on a detection-estimation strategy. The impulse detection algorithm is used before the filtering process, and therefore only the noise-corrupted pixels are replaced with the estimated central noise-free ordered mean value in the current filter window. The new impulse detector, which uses multiple thresholds with multiple neighborhood information of the signal in the filter window, is very precise, while avoiding an undue increase in computational complexity. For impulse noise suppression without smearing fine details and edges in the image, extensive experimental results demonstrate that our scheme performs significantly better than many existing, well-accepted decision-based methods. Simulation is done using Xilinx ISE software of XILINX platform studio where the implementations utilize on Spartan 3EDK FPGA board of XC3S200E device family.
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