Face Hallucination is a super-resolution technique to obtain high-resolution facial images by taking low-resolution facial images as input. In this paper problem of face hallucination has been approached by using sparse Representation. The image has to be subdivided into different segments so that image pixel information can be retrieved easily from each segment. Each small patch of the image h...

In this paper a method for digitally recording four quarter-reference-waveholograms (by CCD) in a Mach-Zehnder interferometer setup, and reconstructing the object wave-front by numerical method is presented. The terms of direct transmission, auto-correlation and conjugate wave in the four wave reconstruction are cancelled out and only one original object wave is left after overlapping. Reconstr...

Abstract Single pixel imaging as an alternative to traditional methods, has attracted extensive attention in various research fields. Metasurfaces with subwavelength unit cells and compact footprint can be used a substitute for optical elements. In this work, we propose single scheme based on metasurface composed of photon sieves, where spatial modulation is realized through shifting. Spatial m...

BACKGROUND Gibbs ringing has been shown as a possible source of dark rim artifacts in myocardial perfusion studies. This type of artifact is usually described as transient, lasting a few heart beats, and localised in random segments of the myocardial wall. Dark rim artifacts are known to be unpredictably variable. This article aims to illustrate that a sub-pixel shift, i.e. a small displacement...

Moiré Interferometry (MI) theoretically can provide real-time full strain field measurements in dynamic environment. So it’s extensively used in reliability analysis of electronic packaging. Due to the nature of specimen preparations procedure, the optical noise is usually too strong so that an accurate phase-based information processing is not possible. In this paper, a 164 nm/pixel spatial re...

The complexity of physical verification increases rapidly with fast shrinking technology nodes. Considering only design rule checking (DRC) constraints or lithography models cannot capture the side effects in fabrication process well. Thus, it is desirable to consider a more general problem various types hotspots. In this paper, we apply machine learning which based on pixel-based feature extra...

Single-pixel detecting is suitable for wavefront reconstruction in some special wavelengths where array detectors are immature or even unavailable and/or under low light conditions. However, most of the demonstrations generally realized by multi-step phase-shifting interferometry with a liquid crystal spatial modulator (LC-SLM) that has slow modulation speed, which limits thus restricting pract...

Mutual information between diffusion-weighted and T2-weighted images, used for eddy-current distortion correction in diffusion tensor imaging, is generally estimated using linear interpolation and partial volume methods. These methods compromise the values of the mutual information, thus providing reduced accuracy in eddy-current distortion correction parameters. To avoid these artifacts, we de...

In recent years, lensfree on-chip microscopy has developed into a promising and powerful computational optical technique that allows for wide-field, high-throughput microscopic imaging without using any lenses. However, due to the limited pixel size of state-of-the-art image sensors, lens-free generally suffers from low resolution, which is far enough meet current demand high-resolution microsc...