The resolution parameter of CCD is the factor which limits the spatial resolution of optoelectronic system. The using of high-resolution CCD is not always possible, especially for measurements in IR wavelength (1350nm) band. The purpose of given work is increasing the spatial resolution of the newly introduced Medianfield method which is focused on beam profile measurements for fiber-chip coupling systems by means of processing low-resolution images sequences. The results of numeric experiments show that the given image restoration method makes it possible the super-resolution restoration of images for possible transmission of information about high spatial frequencies, through diffraction limited optical system. Theoretical assessment allows to predict required conditions for this transmission. Results of experiments for super-resolution images which differ by sub-pixel shift show possibility of theoretical prediction optimal parameters for image (signal) restoration (required number of processed images, point spread function and etc.)
The method of transmission of information about high spatial frequencies of optical object on low frequencies is developed. The method is based on a statistically optimal solution of the Fredholm's integral equation of the first kind, which describes the general process of formation of signals and images. The given solution allows to use transmission of several images of the same object, which differ by conditions of formation (the kind of illumination, modulation, etc.), through limited channel capacity of system. The method is mathematically justified and suitable for processing linearly generated images registered by optoelectronics system on the basis of a focal-plane array. Here we introduce the quantitative information-theoretical performance evaluation of optoelectronics system as the minimum probability estimation of restoration error to exceed of specified value. Its values depend on the geometrical shape and spectral photosensitivity of pixels, fill factor of focal-plane array and point spread function of system. For several optoelectronics systems of image registration of the same object this performance depends on the point spread function of each system. Given information performance allows to optimize the theoretical determination of requirements of images formation for transmission. Numerous simulations and physical experiments that confirm the possibility of transmission of information about high spatial frequencies are carried out. The experiments show that our method makes possible the super-resolution restoration of images, which are heavy blurred by light scattering and the diffraction limits of optical system.