Generic multispectral demosaicking based on directional interpolation

Abstract

The low-cost snapshot multispectral spectral imaging systems with multispectral filter array (MSFA) require generic MSFA demosaicking methods to generate the multispectral image (MSI) with a variable number of spectral bands depending on the applications. Most of the existing MSFA demosaicking methods are either non-generic or perform inadequately. This paper presents a new generic MSFA demosaicking method based on the directional weighted interpolation. Our proposed method calculates the four directional estimates around the location of the unknown pixel and combines them in a weighted manner using the local edge magnitude in the corresponding directions to estimate the missing pixel values. Experimental results confirm that the proposed demosaicking method provides improvement, compared to the state-of-the-art generic demosaicking methods in terms of both subjective and objective evaluations on the two benchmark MSI datasets.