Optical-digital correlator with increased dynamic range using spatially varying pixels exposure technique

In this work the application of the spatially varying pixels exposure technique for obtaining linear high dynamic range (HDR) images of correlation signals by Bayer-covered photo sensors is presented. Bayer colour filters array is considered as an array of attenuating filters in the quasimonochromatic light. The procedure of HDR images reconstruction using data from neighbour pixels and preliminary obtained correction coefficients is described. Experimental results of HDR registration of correlation signals are provided. It is shown that reconstructed HDR correlation signals are linear as normal signals are. The increase of dynamic range of signal’s registration from 58 dB up to 73 dB is obtained. Results on recognition of test objects with normal and HDR registration are discussed. The article is published in the original.