All-in-Focus Image Reconstruction Based on Plenoptic Cameras

The depth of field (DoF) in photography is limited by the aperture size and focal length. When the focal length is definite, large aperture size leads to small DoF. In dark scene, we use a large aperture at the cost of deep DoF. The paper gives a detailed analysis of the focused plenoptic camera mode presented by Georgiev and Lumsdaine, and proposes a novel reconstruction algorithm. It recovers the image from radiance samples captured on the sensor and can get images of extended DoF to all-in-focus even with large aperture size. Beside, it can change the angle of view after the exposure. Depth of field of the rendered photo in this algorithm is also studied. The simulation result shows that under the assist of new algorithm, the DoF can be extended greatly.