Systems and methods for operating a thermodynamic engine are disclosed. The method includes detecting character regions including at least one character in an input image, converting the input image into a binary image, discriminating the characters from a non-character, re-classifying the character region including a number of characters equal to or less than a threshold into a non-character region, and outputting only the characters present in the character region. % organotrialkoxysilane of formula Hx\u2014R2\u2014Si\u20143, wherein R1 and R2 are alkyl groups or intermediate aromatic groups, R3 is an aryl group, the three substituents R3 cannot be the same and x is 0-2; a layer of said mixture is deposited on the substrate; the mixture is dried in order to evaporate the solvent; the aggregate thus obtained is heated to a temperature of 70-170\xb0 C. Aggregation of bi-directional inter-digital transducer, U-type 3 dB MSC, pair of zebra-wave-guides with different quantity of isolated fingers and IDT-wave-guide represents a partially-unidirectional-combined-IDT, that may be utilized for a miniaturized low loss SAW filter design.