Sergii V. Pavlov

New method to control color intensity for antialiasing

The paper suggests a twelve-angle pixel model for anti-aliasing purposes. Additional evaluation functions had been used to identify the intensity of pixel color. The functions can be calculated independently. For the realization of anti-aliasing on hardware a structure of a device is suggested.

Bio-inspired approach to multistage image processing

Multistage integration of visual information in the brain allows people to respond quickly to most significant stimuli while preserving the ability to recognize small details in the image. Implementation of this principle in technical systems can lead to more efficient processing procedures. The multistage approach to image processing, described in this paper, comprises main types of cortical multistage convergence. One of these types occurs within each visual pathway and the other between the pathways. This approach maps input images into a flexible hierarchy which reflects the complexity of the image data. The procedures of temporal image decomposition and hierarchy formation are described in mathematical terms. The multistage system highlights spatial regularities, which are passed through a number of transformational levels to generate a coded representation of the image which encapsulates, in a computer manner, structure on different hierarchical levels in the image. At each processing stage a single output result is computed to allow a very quick response from the system. The result is represented as an activity pattern, which can be compared with previously computed patterns on the basis of the closest match.

Method of anti-aliasing with the use of the new pixel model

The paper proposes additional evaluation functions to mark the segment area that cuts straight line to determine the intensity of the color pixel. For anti-aliasing purposes a twelve-angle pixel model is suggested. Additional evaluation functions are used to identify the pixel color intensity. These functions can be calculated independently. A structure of a device is proposed for hardware implementation of anti-aliasing.

Methods and fiber optics spectrometry system for control of photosensitizer in tissue during photodynamic therapy

Photodynamic cancer therapy is used as an alternative or in combination with conventional treatments. PDT involves three key components: a photosensitizer, a light source and tissue oxygen. The combination of these three components leads to the chemical destruction of any tissues which have either selectively taken up the photosensitizer or have been locally exposed to light. In our research we used Charge-coupled device (CCD) spectrometers to measure intensity of the fluorescence signal. Devices allow receiving and processing signal in a CCD structure at a wide range of wavelengths. We have established a system for measuring the fluorescence of tumor tissue. These results are important for determining the dose of laser radiation and optimal time for laser action without damaging healthy tumor.

Diagnostic efficiency of Mueller-matrix polarization reconstruction system of the phase structure of liver tissue

The application field of using the Mueller-matrix polarizing reconstruction system of phase structure of biological layer for optical-anisotropic parameters differentiation of histological sections of healthy and rat’s liver with hepatitis were investigated. Comparison of system informativity with known systems on indexes of sensitivity, specificity and balanced accuracy were performed.

Methods of processing biomedical image of retinal macular region of the eye

In this paper we report a new method for determination of macular area of the retina obtained by optical coherent tomography (OCT). A novel program of image processing was developed for this purpose. The improved efficiency of proposed tools and it accuracy in the determination of the parameters in the macular area was checked by comparison of results with the standard procedure of processing of the biomedical images of this class. All calculation were obtained from the retina tomograms by using coherent optical topographic scanner STRATUS OCT 3000

Adaptive determination of diffusive and specular components of colors for rendering of face images of persons at planning of plastic operations

Формування складових кольору зображень ділянок обличчя є складною обчислювальною задачею, оскільки для кожного піксела поверхні необхідно обчислити інтенсивність кольору, для чого необхідно визначити одиничні векторів до джерела світла та нормалі до поверхні. Тому актуальною задачею є спрощення процедури зафарбовування без втрати реалістичності кінцевого зображення. Запропоновано для зафарбовування використовувати адаптивно поліноми другого та третього степенів залежно від кривизни поверхні. Для поліному третього степеня отримано апроксимаційну формулу для визначення дифузної та спекулярної складових кольору. Запропоновано апаратні засоби для визначення коефіцієнтів та апроксимаційного поліному

Offsetting and blending with perturbation functions

Transformations of geometric objects are described for offsetting. This paper presents the real-time synthesis of highquality images – a method of defining free forms without approximating them with polygons or patches, issues of using perturbation functions for real-time animation of the surfaces of three-dimensional objects. The method for visualizing functionally defined objects adapted for graphics processing units is proposed, as well as methods of transforming the describing function are implemented for geometric operations, such as deformation, displacement, morphology operation, also for nonhomeomorphic objects.

Principles of fast count in modified Fibonacci numerical system

The theoretical aspects of count in the modified Fibonacci numerical system are proposed in the article. It allows constructing of high-speed Fibonacci counters where the hardware costs are comparatively small and increase proportionally at code length growth. Fibonacci transformations of codes are described that play the role of carryings and borrowings at increment and reverse count. The admissible forms of codes for specifying the initial states of counters are explored.

Precision measurement of coordinates of power center of extended laser path images

Authors have worked out a nonstationary signal analysis method on an example of research of laser lines. This method disclosed relationship between signal approximation coefficients and geometry signal characterizations (for instance, energy center, moment of inertia). Examples, which is demonstrating an application of this method for exact coordinate determination problem in laser line at displacement compensation in laser imaging are present.