Image synthesis using the modulation transfer characteristic of a thermal imaging optoelectronic system in order to evaluate the resolution


Аuthors

Krasnov A. M.1*, Shashkov S. N.2, Rumyantsev A. V.3

1. Closed Joint Stock Company «Technological Park of Cosmonautics «LINKOS»», Moscow, Shcherbinka, Russia
2. State Research Institute of aviation systems, Moscow, Russia
3. Сenter (control of integrated safety and security) the MoD RF , Moscow, Russia

*e-mail: a_krasnov@inbox.ru

Abstract

The definition of the modulation transfer characteristic is considered, the electro-optical system parameters determining the resolution are also analyzed: the angular size of the image blur spot, the instantaneous (elementary) field of view, the angular size of the detector, the dot scattering function, and the relationship between them is shown. 
The modulation transfers characteristic of the thermal imaging electro-optical system and its components are calculated based on the results obtained at the laboratory testing stage, as well as a comparison of the components of the laboratory and calculated (theoretical) modulation transfer characteristic. Then, the content of the synthesis of images of objects using linear filtering in the frequency and spatial domains is disclosed, taking into account the modulation transfer characteristic and the dot scattering function. 
The basic idea of filtering in the spatial domain is to define the filter, and in the frequency domain, the transfer function of the filter. If, depending on the characteristics of the filter (transfer function), the high-frequency components weaken, and the low-frequency components remain relatively unchanged, then a filter with such characteristics is called a low-frequency filter. The result of low-frequency filtering is blurring (smoothing) of the image, and vice versa, the result of high-frequency filtering is an increase in image sharpness, that is, low frequencies are attenuated, leaving the high frequencies of the Fourier transform relatively unchanged. An example of image synthesis for the objective assessment of image sharpness through the use of histograms is considered. 
The relevance of this material is due to the need for an objective tool for assessing the resolution of optoelectronic systems, excluding subjective opinion due to the human factor. In conclusion, the place of synthesis of images of objects using modulation transfer characteristic in the digital model of the combined vision system is determined.

Keywords:

modulation transfer characteristic, linear filtering in the frequency (spatial) domain, synthesis of images of objects, thermal imaging electro-optical system

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