A circular Dammann grating in the front focal plane of a lens is used to generate an annular beam in the back focal plane to code an object by two-dimensional scanning. The coded image of the object is decoded digitally by convolving it with the same annular beam used to code the object. Simple inverse filtering is subsequently used to improve the contrast of the decoded image.

This paper presents a new fast discrete focal stack transform that can be used in the 3D depth recovery problem using a single image of a scene from a plenoptic camera. A plenoptic camera uses a microlens array between the lens of the camera and the image sensor to measure the radiance and direction of all the light rays in a scene. The microlens array creates many small images taken from sligh...

New methods are needed to rapidly identify malaria parasites in blood smears. The coupling of a Focal Plane Array (FPA) infrared microscope system to a synchrotron light source at IRENI enables rapid molecular imaging at high spatial resolution. The technique, in combination with hyper-spectral processing, enables imaging and diagnosis of early stage malaria parasites at the single cell level i...

Real-time image processing requires high computational and I/O throughputs obtained by use of optoelectronic system solutions. A novel architecture that uses focal-plane optoelectronic-area I/O with a fine-grain, low-memory, single-instruction-multiple-data (SIMD) processor array is presented as an efficient computational solution for real-time hyperspectral image processing. The architecture i...

Context. Micrometeoroid or space debris impacts have been observed in the focal planes of the XMM-Newton and Swift-XRT (X-ray Telescope) X-ray observatories. These impacts have resulted in damage to, and in one case the failure of, focal-plane Charge-Coupled Device (CCDs) detectors. Aims. We aim to quantify the future risks of focal-plane impacts in present and future X-ray observatories. Metho...

In a classical metasurface-based holographic display system, clear reconstruction image can be obtained only in the back-focal-plane of lens. However, when receiving plane deviates from focal plane, reconstructed suffers degradations that limit quality images. Hence, we propose novel to realize clearly continuous imaging within specified position range by superimposing meta-axilens phase. It ef...

We explore an interferometric beam shaping technique that considers the coaxial superposition of two Gaussian beams. This technique is traditionally implemented in a Mach-Zehnder interferometer; however, to avoid phase shift drift due to vibrations and thermal effects we employ amplitude and phase modulation with a spatial light modulator (SLM) to achieve the beam shaping. We consider two Gauss...

60 | VOL.10 NO.1 | JANUARY 2013 | nature methods fluorescence microscopy using beam splitters to image up to four focal planes on separate cameras3. This method provides excellent light efficiency and a large lateral field of view corresponding to the entire surface area of the camera chip. However, refocusing by translating the camera away from the nominal focal plane induces spherical aberrat...

Monolithic integration of photodetectors, analogto-digital converters, digital processing, and data storage can improve the performance, efficiency, and cost of next-generation portable image products. These components can combine into a single processing element that can be tiled to form a pixel-level focal plane processor array. This paper describes a method to design an efficient focal plane...

Infrared (IR) sensor technology is critical to all phases of ballistic missile defense. Traditionally, material systems such as indium antimonide (InSb), platinum silicide (PtSi), mercury cadmium telluride (MCT), and arsenic doped silicon (Si: As) have dominated IR detection. Improvement in surveillance sensors and interceptor seekers requires large, highly uniform, and multicolor (or multispec...