I have done an implementation of this paper from CG&A for image reconstruction.

Original and a greyscale from CIE luminance

8x magnification - greyscale

8x scale using gimp

DDT method (8 passes using yms optimisation)

8x magnification - colour

8x scale using gimp

DDT method (8 passes using yms optimisation)

DDT method (3 passes using yms optimisation)

Photo from a recent shuttle mission

original photo

zoomed section original

4x magnification using gimp

DDT method (8 passes using yms optimisation

A simple example


My implementation

Gimp version

Another edge-directed algorithm on the same image

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