Enhanced RL-IBD algorithm for image restoration

摘要

The performance of high-resolution imaging with large optical instruments is severely limited by atmospheric turbulence. Image deconvolution such as iterative blind deconvolution (IBD) and Richardson-Lucy (RL) deconvolution are required. The IBD method involves the imposition of constraints such as conservation of energy, positivity, and finite support, with known size, alternately on the image and the PSF in the spatial and Fourier domains, until convergence. The iterative RL solution converges to the maximum likelihood solution for Poisson statistics in the data. Properties of the RL algorithm which make it well-suited for IBD are energy conservation and the sustenance of nonnegativity. So, RL was incorporated into the IBD framework. In this paper, an enhanced Richardson-Lucy-based iterative blind deconvolution (ERL-IBD) algorithm is proposed to restore the blurred images due to atmospheric turbulence. The ERL-IBD incorporates dynamic PSF support estimation, bandwidth constraint of optical system, and the asymmetry factor update. The experimental results demonstrate that the ERL-IBD algorithm works better than IBD algorithm in deconvolution of the blurred-turbulence image.