Fast Realistic Refocusing for Sparse Light Fields

Chao-Tsung Huang1, Jui Chin2, Hong-Hui Chen2, Yu-Wen Wang1, Liang-Gee Chen2

1 National Tsing Hua University, Department of Electrical Engineering
2 National Taiwan University, Graduate Institute of Electronics Engineering




Digital refocusing for sparsely sampled light fields results in aliasing effect. For realistic quality, previous works performed anti-aliasing by applying time-consuming view interpolation for a heuristic number of novel views. In this paper, we study this problem by first performing a spectral analysis to give an analytical rule for the novel view number, which saves 34% of views compared to the intuitional choice. Then we propose a fast refocusing algorithm using a view interpolation method which is about 30x faster than VSRS-1D-Fast. Experimental results show the effectiveness of our approach in terms of speed and quality. For showing realistic refocusing, a light-field wafer-level-optics array is implemented, and its refocused images are compared to pictures captured by a real camera.


"Fast Realistic Refocusing for Sparse Light Fields," Proc. ICASSP, 2015. [preprint, 5.5MB]


Experimental Refocusing Results

Move mouse on the refocused images to activate GIF animation for viewing dynamic refocusing effect

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  Tsukuba Disparity Map



 Truck Disparity Map



  Knight Disparity Map

Potato [dataset] (captured by DragonFly)

  Potato Disparity Map

Car [dataset] (captured by DragonFly)

  Car Disparity Map



DragonFly: Wafer-level-optics array camera



More DragonFly Dataset

WordsOnGlass [dataset] (captured by DragonFly)


Grate [dataset] (captured by DragonFly)


Flower [dataset] (captured by DragonFly)


Bicycle [dataset] (captured by DragonFly)


PrunusMume [dataset] (captured by DragonFly)

Full aperture (A=2)


Full aperture (A=1)



This work was supported by the Ministry of Science and Technology, Taiwan, R.O.C. under Grant no. MOST 103-2218-E-007-008-MY3. The authors thank Himax Technologies, Inc., for providing wafer-level optics.


Last update on Feb 12, 2015