Quantum noise is typical of images obtained with a small amount of photons and X-ray fluoroscopy is an example of the type. Indeed, to keep the doses of radiation to acceptable levels for the patient and, at the same time, to allow prolonged screening, the number of X photons is drastically reduced giving rise to a remarkable quantum noise on the images. For various applications it is necessary...

An algorithm is presented which extracts features from a time series of Flash LADAR images without a-priori knowledge of the surrounding environment. Flash LADAR utilizes laser ranging to acquire 3D information in the object space, which may be utilized to reconstruct the sensor environment. The extracted features are tested to identify motion artifacts and separate entities into static and non...

This work presents a new algorithm (nonuniform intensity correction; NIC) for correction of intensity inhomogeneities in T1-weighted magnetic resonance (MR) images. The bias field and a bias-free image are obtained through an iterative process that uses brain tissue segmentation. The algorithm was validated by means of realistic phantom images and a set of 24 real images. The first evaluation p...

OBJECTIVE Morphing is an image processing technology that transforms one image into another by generating a series of intermediate synthetic images. The ability to perform morphing, once restricted to high-end graphics workstations, is now widely available for desktop computers. We investigated the potential use of morphing for displaying radiographic images. MATERIALS AND METHODS Morphing wa...

We report replacement of one side of a static illumination, dual sided, thin-sheet laser imaging microscope (TSLIM) with an intensity modulated laser scanner in order to implement structured illumination (SI) and HiLo image demodulation techniques for background rejection. The new system is equipped with one static and one scanned light-sheet and is called a scanning thin-sheet laser imaging mi...

This paper gives a review of the methods that we have developed over the last few years to register 2D/3D images and image sequences. Initially, we will introduce a feature-based method, which will be followed up by a summary of the intensity-based methods. Then we will present some applications of our methods using biomedical images with more automated image analysis tasks. The main applicatio...

Facial mimicry is the spontaneous response to others' facial expressions by mirroring or matching the interaction partner. Recent evidence suggested that mimicry may not be only an automatic reaction but could be dependent on many factors, including social context, type of task in which the participant is engaged, or stimulus properties (dynamic vs static presentation). In the present study, we...

Hybrid images are static pictures with two interpretations that change depending on the image’s viewing distance or size. The phenomenon of hybrid images arises from the multiscale processing of images in the human visual system. By taking into account perceptual grouping mechanisms, one can build compelling hybrid images with two different stable interpretations: one that appears when the imag...

OBJECTIVE The aim of this study is to prove if dynamic HASTE (half-Fourier acquisition single-shot turbo spin-echo) sequences can be used in the diagnosis of internal derangement disorders of temporomandibular joint (TMJ) as an alternative to static proton density (PD) weighted/turbo spin echo (TSE) T2-weighted sequences which are considered up to now as the gold standard in the evaluation of T...