Defocus map estimation from a single image using principal components

Light is a mixture of multiple spectral components. An image is a response of the scene with respect to these spectra. Principal components are more compact representation of the data compared to any other representations. Hence accuracy of the estimated defocus parameter is higher in principal component representation than any other customary used representations. In this paper, we present comparison between principal component representation and customary gray scale representation for depth map creation. The presented results shows that the depth maps obtained using principal component are smoother than depth maps obtained using gray scale representation. Besides that, the noise estimation using principal components is much more accurate than using Wiener strategy.