Immersed Apertures

Depth from Moving Apertures

Two new focus measure operators for Shape From Focus to estimate the three-dimensional shape of a surface are proposed in this paper. The images are formed by a camera using moving apertures. The well-focused image pixels are identified by frequency analysis or matching with the all-focused image of the scene. Frequency analysis involves the usage of classical focus measure operators and summin...

Waveguiding in nanoscale metallic apertures.

We study the optical properties of subwavelength metallic waveguides made of nanoscale apertures in a metal. We develop analytical expressions for the fundamental optical modes in apertures. The results are in excellent agreement with finite element calculations. This model provides a physical understanding of the role of non-perfect metallic walls, and of the shape and size of the apertures. T...

Computed spectroscopy using segmented apertures

A novel technique for imaging spectroscopy is introduced. The technique makes use of an optical imaging system with a segmented aperture and intensity detector array on the imaging plane. The point spread function (PSF) of such a system can be adjusted by modifying the path lengths from the subapertures to the image plane, and the shape of the resulting point spread function will vary as a func...

Simulated Programmable Apertures with Lytro

This paper presents a simulation method using the commercial light field camera Lytro, which allows simulation of various aperture shapes and noise characteristics. A modified shift-and-add algorithm is used to implement aperture shape simulation. Two example use cases, special bokeh effects generation and multiplexed light field acquisition analysis, are given to demonstrate the system. Compar...

Photography with Color-Coded Apertures