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This paper describes a novel approach to partially reconstructhigh-resolution 4D light fields from a stack of differently focused photographstaken with a fixed camera. First, a focus map is calculated from this stackusing a simple approach combining gradient detection and region expansion withgraph-cut. Then, this focus map is converted into a depth map thanks to thecalibration of the camera. We proceed after this with the tomographicreconstruction of the epipolar images by back-projecting the focused regions ofthe scene only. We call it masked back-projection. The angles ofback-projection are calculated from the depth map. Thanks to the high angularresolution we achieve by suitably exploiting the image content captured over alarge interval of focus distances, we are able to render puzzling perspectiveshifts although the original photographs were taken from a single fixed cameraat a fixed position.

Partial light field tomographic reconstruction from a fixed-camera focal stack