Correlation-based deblurring leveraging multispectral chromatic aberration in color and near-infrared joint acquisition
Joint acquisition of color and near-infrared (NIR) images is of growing interest due to various applications that make use of the additional spectral information. An obstacle to this acquisition is the wavelength-dependent blurring caused by the chromatic aberration of optical lenses. When one of the spectral channels, for example the green channel, is in focus on the sensor plane, the images of the other channels, especially NIR, are blurred. This paper presents a study of spectral-spatial correlations between color and NIR channels and proposes a method to correct for chromatic aberrations. The algorithm we introduce leverages axial chromatic aberration to deblur the NIR image when the color image is in focus. The proposed technique improves image sharpness by 48.8% on average compared to state-of-the-art results. Moreover, our method generates an NIR image that has a larger depth-of-field compared to an NIR image originally captured in focus.