Oct 13

Researchers Develop Geometric Calibration Method for MLA-based Light Field Cameras using Line Features in RAW Images

^Researchers Develop Geometric Calibration Method for MLA-based Light Field Cameras using Line Features in RAW Images (picture: Bok et al. 2014) Calibration is an important part of light field photography: Image processing and image quality can be significantly improved when the physical properties of the camera are known. More specifically, geometric information about the microlenses in a microlens-array-based light field camera can help create more precise depth maps with fewer errors.

Yunsu Bok and colleagues from the Korean Advanced Institute of Science and Technology (KAIST) have devised a new method for geometric calibration which – in contrast to conventional methods – does not rely on processing sub-aperture images. Instead, they extract line features and compute a light field camera’s geometric parameters directly from RAW images. Continue reading

Jan 28

LightField Software to Process your DIY LightField pictures (Part 1)

So you’ve built your own LightField Camera? Taken your first LightField pictures? What’s next?
The next step is finding software that will allow you to process the captured LightField information. There are countless factors in which LightField setups can differ, so unfortunately processing your pictures is not just a matter of click and refocus. There is some software available, though, that will help you work with your very own LightField photographs.

Part one of our feature on “LightField Software” will focus (pun intended) on tools made public by the Stanford Computer Graphics Lab.

LFDisplay – Real-Time LightField Viewer

LFDisplay - Real-Time LightField Viewer Originally developed for , LFDisplay will also work with LightField pictures taken with other setups (including a DIY LightField camera). The Open-Source tool for Mac and Windows provides the following LightField features

  • software refocus: two refocus sliders (coarse and fine) for adjustment along the virtual z-axis
  • synthetic aperture controls: pinhole, full and custom aperture
  • virtual [tag]3D tilting via click & drag

Continue reading