Super-resolution image synthesis using the physical pixel arrangementofalight field camera
Kazuki Ohashi, Keita Takahashi, Mehrdad Panahpour Tehrani, Toshiaki Fujii · 2015
We propose a method for super-resolution image synthesis that accurately handles the physical pixel arrangement of a light field (plenoptic) camera. We use a Lytro camera to obtain 4D light field data (a set of multi-viewpoint images) through a micro-lens array. The light field data are multiplexed on a single image sensor, and thus, the data is first de-multiplexed into a set of multi-viewpoint (sub-aperture) images. However, the de-multiplexing process usually involves interpolation of the original data such as demosaicing for a color filter array and pixel resampling for the non-square micro-lens arrangement. During this interpolation, some information is added or lost to/from the original data. In contrast, our method can preserve the originally captured data as they are, and directly use them for the super-resolution image synthesis, where the super-resolved image and the corresponding depth map are alternatively refined. We experimentally demonstrate that our method can achieve higher image quality than that with a standard Light Field Toolbox.