Manish Kumar*, Sudhansu Kumar Mishra, Sumit Kumar Choubey, Sanjay Shankar Tripathy, Dilip Kumar Choubey and Dinesh Das Pages 329 - 339 ( 11 )
Background: The Gaussian and impulse noises corrupt the Computed Tomography (CT) images either individually or collectively, and the conventional fixed filters do not have the potential to suppress these noise.
Objectives: These spurious noises affect the inherent features of CT image awkwardly. Hence, to handle such a situation adaptive Cat Swarm Optimization based Functional Link Multilayer Perceptron (CSO-FLMLP) has been proposed in this paper to get rid of unwanted noise from the CT images.
Methods: Here, the nature-inspired CSO technique which is an optimization algorithm has been employed to assist in updating the weights of FLMLP network. In this work, the cost function considered for CSO is the error between noisy and contextual pixels of reference images which need to minimize. For examining the efficiency of CSO-FLMLP filter, it is compared with the other six competitive adaptive filters.
Results: The performance of proposed approach and other state-of-the-art filters are compared on the basis of performance metrics like the structural similarity index (SSIM), peak signal to noise ratio (PSNR), computational time and convergence rate. Supremacy of CSO-FLMLP among the considered adaptive filters is validated through Friedman statistical test.
Conclusion: The CSO-FLMLP adaptive filter could successfully re-move the dominant Gaussian, impulse or combination of both noises from the clinical CT images.
Adaptive filter, cat swarm optimization, neural network, nature inspired technique, medical image, noise.
Department of Electrical and Electronics Engineering, Birla Institute of Technology, Ranchi, Department of Electrical and Electronics Engineering, Birla Institute of Technology, Ranchi, Department of Electronic and Communication Engineering, Birla Institute of Technology, Ranchi, Department of Electronic and Communication Engineering, Birla Institute of Technology, Ranchi, Department of Computer Science and Engineering, National Institute of Technology, Patna, Department of Radiology, Medanta Hospital, Ranchi