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.