Ákos Antal

Projection method of resolving ambiguities by determining the order of colors in moiré fringes.

From the scientific literature there are some well-known methods used to resolve the arising problem of ambiguities in moiré patterns. The main disadvantage of these methods is that for image processing one must use several patterns. It means that it is impossible to work with dynamic objects in a real-time operation mode. We present a projection method to resolve ambiguities by determining the order of colors in moiré patterns. This method is based on the application of color rulings to gratings in a projection moiré technique.

Scoliosis testing features on the basis of electronically generated moire patterns

The Dept. of Mechatronics, Optics and Information Engineering, within the project team, had built an electronic moire equipment primarily visualising and diagnosing of scoliosis. The device generates a computerized moire phenomenon, which can be viewed by an appropriate display. The applicability of the system was tested from statistical point of view based on moire patterns created by the prototype device particularly the characteristics of the scoliosis.

Spineline detection with image evaluation

In case of screening and tracking conditions of patients [20] with spinal deformities it is very important to develop an examination method that does not load patinets’ body with harmful radiation. This method is based on the moiré effect. Pictures were taken from patients’ back and information could be obtained about the back’s condition. A computer algorithm is under development that can produce the sagittal line of the spine from moiré images. This program is being tested with Scheuermann disease patients. Keywords—computer algorithm; spinal curve; detection; moiré

Computerized evaluation of digital orthopedic moiré pictures

By the superimposition of two similar periodic structures translated, or rotated relative to each other, a new structure arises with longer periods. This one is called Moiré pattern and it consists of the Moiré fringes. Moiré imaging (used mostly in spinal deformities) is non-contact, fast, and its harmful radiation does not load patients and can be repeated any number of times. For detecting the spinals shape, a software has been implemented in LabVIEW programming environment with several image processing method. The shape of the spine could be sufficiently reproduced using this program. Screening can be established without X-Ray images, which is much faster and healthier for patients. Keywords— Moiré method, LabVIEW algorithm, image evaluation, orthopaedics

Effects of Ocular Optical Aberrations on Non-overlapped Image Filtering

Recent results in retinal research have shown that ganglion cell receptive fields cover the mammalian retina in a mosaic arrangement, with insignificant amounts of overlap in the central fovea. This finding implies that from the informatics point of view there is a major conceptual gap between traditional and widely accepted, convolution based image filtering algorithms, and the way visual information is processed by the retina in the eye. The use of traditional filters with non-overlapping operator architectures leads to considerable information losses between centers of filter kernels. This paper introduces a novel model of the eye-retina system that fills the conceptual gap of information processing between the retina and the overlapping (convolution based) architectures used by todays widely adapted algorithms. The proposed computational model takes into consideration data convergence, as well as the dynamic and optical properties of the eye lens. Based on the evaluation of the model, three hypotheses are formulated on the role of the optical precision of the eye-lens and involuntary eye accommodation dynamics.

Computer Aided Color-encoded Moiré Contouring

Moire topography technique is widely used for automatic inspection systems and machine vision. The problem common for all Moire methods is extraction information about surface ambiguities. Many solutions were worked up to solve the hill and valley problem. Mostly proposed methods required moving hardware and/or complicated analyzing process. In this paper we present a new computer aided color-encoded Moire contouring technique, that simple, cheap and quickly solves the problem of ambiguities in Moire patterns. Our method is based on application of color-encoded gratings

Unique interferometer experiment for controlling the theory of relativity

Although modern theoretical physics states that the velocity of light does not add to the velocity of the light source, and so according to Einsteins theory the velocity of light is independent of the coordinate system, from time to time scientists try to disprove this axiom. We tried to build the most accurate experimental setup according to our technology.