A novel design of N-bit approximate comparator for image processing applications

Purpose This paper aims to implement a novel design of approximate comparator which can be suitable for image processing applications. Design/methodology/approach Here, the N-bit approximate comparator is implemented by taking reference of N as 2-, 4- and 8-bit. The design analyses the fractional change in error to bit in several bit formats. The final implementation of approximate comparator design application compares the structural similarity index, colour test and extraction of an image to the results. Findings The novel approximate comparator was designed using 2-, 4- and 8-bit to explore N-bit comparator expressions. The implementation, computations, evaluation of errors, applications and the design constraints were executed using Python and Synopsys, respectively. The computations, evaluation of errors, applications and the design constraints were executed using Python and Synopsys, respectively. Originality/value This paper presents the N-bit accurate and approximate comparator which is novel over the existing design of comparators.