Materials of journals of ITMO University: research in the field of image processing and computer modeling

In this digest we have collected interesting articles published in the last 2 years in the journals of the ITMO University. All materials are in the public domain and cover topics related to image processing (from lens calculations to automatic image correction) and computer modeling of various processes: starting from the operation of an LED lamp and ending with modeling the behavior of an induction lag sensor on a deep-water vessel.

Pascal / Flickr / PD

Image processing:

"Analysis of the features of the choice of the original optical scheme for the calculation of non-display optical systems" (2016)

Scientists investigate the differences between imaging (form an image of an object) and non-imaging (transmit and redistribute energy in space) optical systems and, in particular, study the properties, characteristics and approaches to the design of non-imaging optical systems (NOS). The results of the study may find applications in the development of NOS (illuminators, concentrators, etc.) and will be useful to engineers who specialize in the development or operation of NOS.

“Investigation of the influence of birefringence on the image quality of photolithographic systems with partially coherent lighting” (2016)

The researchers analyze the state of birefringence, which can occur in the process of creating blanks of optical glass and (when creating optics with high resolution) degrades the image quality. The authors propose a new algorithm for calculating the formation of images - the results can be used in the development of photolithographic lenses.

"Segmentation of unfocused areas on 2d images of surfaces using textural features" (2015)

The authors of the study are studying the issue of improving the process of obtaining images of industrial facilities and, in particular, are working on the task of automatically removing areas from the images that are “out of focus”. To solve this problem, the researchers propose to use focal texture features — they are usually used in the automatic focusing systems of microscopes and cameras.

“The afocal compensator for aberrations” (2015)

The purpose of the study is to develop an afocal compensator for aberrations, which would correct one or several aberrations without affecting the correction of others. This problem is relevant when calculating the mirror objectives or microscope objectives. The paper proposes a scheme for such a compensator and provides an example of the calculation of a two-lens lens with an afocal compensator.

"Automatic quality control of continuous dough kneading in a complex-mechanized line using computer image processing" (2014)

Computer image processing can be used to solve non-trivial tasks - for example, in the food industry. The authors propose to use it to create an automatic tracking system for quality control during baking and describe the mathematical model of the operation of such a system.

Previous and subsequent noise filtering in image recovery algorithms (2014)

Researchers study the problem of eliminating noise in blurred and / or defocused images and determine the most effective noise filtering procedure (before or after eliminating blurring / defocusing) by conducting an experimental test to obtain quantitative estimates of the image recovery error.

“Image conversion in mosaic uncooled microbolometer receivers of the infrared and terahertz ranges up to 3072 × 576 or more” (2014)

Uncooled matrix microbolometer receivers of infrared and terahertz radiation are used in tracking systems, monitoring and surveillance in the civil and military industries. The task of researchers is to increase the format of the photodetector matrix and reduce the size of photosensitive elements in this matrix. As a solution, the researchers propose to implement a mosaic photodetector, the design and technological principles of creation of which are described in the article.

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Computer modelling:

"Mathematical and computer simulation of the automatic control system of hydrostatic bearing" (2016)

The authors solve the problem of improving the integrated studies of the influence of thermal processes on the dynamic characteristics of hydrostatic bearings using the MATLAB & Simulink software package.

“Computer simulation by the Brownian method of local mobility in dendrimers with asymmetric branching” (2016)

Dendrimers are a class of branched polymer macromolecules having a regular tree structure. Dendrimers have stable structural characteristics, so they are used as standards in various types of spectroscopy. The authors use computer modeling techniques to study the properties and characteristics of these macromolecules.

“Computer simulation of the strength characteristics of the induction lag sensor” (2016)

Researchers analyze the problems of insufficient strength sensor induction lag. Lag is used to measure the speed of ships - however, in the case of deep-sea apparatuses, which are submerged to a depth of 6 km, the outboard equipment is overloaded - therefore, increased equipment is required for the strength of the equipment (including the lag construction, which the work is dedicated to). The authors propose design and technological solutions that enhance the performance of this type of lag.

"Modeling of condensation and evaporation in the channel of the regenerative heat exchanger" (2016)

The authors are exploring promising areas for improving ventilation and air conditioning systems and, in particular, are considering the issue of using the thermal potential of exhaust air (air conditioning and ventilation schemes with regenerative heat exchangers). Researchers have proposed one of the possible approaches to the thermal calculation of such systems.

"Computer model of the output fiber error of the optical fiber gyroscope under external influences" (2015)

Researchers are studying fiber optic gyroscopes (FOG) and offering a computer model to evaluate the response of the FOG sensitivity sensor to both external thermal and mechanical effects (shock or vibration).

"Formation of a gradient temperature field in the process of spark plasma sintering of thermoelectrics" (2015)

The authors consider the properties of thermoelectric converters operating under conditions of significant temperature differences, and thermoelectric materials with varying functional bulk properties. In order to assess the effectiveness of the spark plasma sintering process of thermoelectrics, researchers conduct computer simulations in the COMSOL Multiphysics software package and analyze the results obtained.

"Algorithm of three-level modeling of a multi-parameter technical system" (2015)
“Model of forecasting the state of a multiparameter technical system” (2015)

The authors of these two articles consider approaches to the implementation of multi-level computer modeling. The articles present the results of the development of a generalized algorithm for a three-level simulation of a multiparameter technical system and the construction of its analytical model with varying degrees of detail based on experimental data.

"The use of spatial light modulators for the formation of laser beams with a spiral phase distribution" (2015)

Laser radiation is widely used for the manipulation of microparticles in biology, medicine and other fields. The functionality of laser manipulators can be significantly enhanced with spiral laser beams. Traditionally, spiral beams are obtained using static masks that specify the amplitude and phase distribution of the beam. The paper proposes a modernized method using two liquid-crystal spatial light modulators, which separately form the amplitude and phase distribution of the laser beam.

"Computer simulation of LED lamps" (2014)

The authors present a computer model of the LED luminaire, created on the basis of the technical parameters of a separate LED, as well as design features and energy characteristics of the light device. In the article, the researchers cite the results of a comparative analysis of the lighting parameters of the computer model and the corresponding values ​​obtained experimentally.