Spatial general autoregressive model-based image interpolation accommodates arbitrary scale factors.This paper proposed a novel image interpolation algorithm with an arbitrary upscaling factor based on the spatial general autoregressive model. 
Spatial general autoregressive model-based image interpolation accommodates arbitrary scale factors
Spatial general autoregressive model-based image interpolation accommodates arbitrary scale factors.This paper proposed a novel image interpolation algorithm with an arbitrary upscaling factor based on the spatial general autoregressive model.  First, to accommodate arbitrary scale factors, a non-integer mapping method was modulated into the spatial general autoregressive model, which was employed to model the piecewise stationary pattern with a higher description capacity than autoregressive models.  A gradient angle guided extension method was utilized to extend the spatial general autoregressive model, and more pixels in the neighborhood were included to estimate the parameters of the spatial general autoregressive model. 
the spatial general autoregressive model