Color distribution functions of multilayer multispectral matrix photodetectors after interpolation

摘要

Subject of study. This study investigated patterns developed for color separation systems based on multilayer sensors to detect radiation in the visible and infrared spectral ranges. Three systems were considered where only half of the sensors comprised a layer sensitive to infrared radiation and a system where each sensor comprised an infrared radiation registration layer. The patterns consisted of various combinations of up to two red, green, blue, or infrared layers in one cell. Aim of study. The study aimed to determine the color distribution function during interpolation in the developed patterns for various combinations of layers. Method. Based on an algorithm for determining modulation transfer functions, the color distribution functions over the image were determined using the nearest neighbor interpolation method. Consequently, the functions obtained for the standard Bayer and developed multilayer patterns with the same cell parameters and having an arrangement similar to a checker-board pattern were compared. Main results. The obtained functions naturally exhibited an oscillatory character. The systems with frequently repeating layers of one part of the spectrum were the most stable. Furthermore, color distribution functions superior to those of Bayer patterns were obtained when the developed patterns were used in a checkerboard pattern for color interpolation using the nearest neighbor method. Moreover, the application of a different order in the pattern may result in poorer color distribution functions. Practical significance. Color distribution functions are useful when choosing a pattern for specific purposes (e.g., for better color resolution in the green part of the visible spectrum or infrared range. The development of multispectral patterns based on four sensors within a bilayer system inevitably results in a decrease in the distribution functions of certain colors. Thus, this should be considered in the production of such color separation systems. Moreover, the results of the study can be useful for specialists in the field of digital technology, matrix photodetectors, and image processing.(c) 2023 Optica Publishing Group