a base layer; and

a plurality of optical layers deposited on the base layer selected from two or more materials, each material having a refractive index that is different from the other materials of the two or more materials, wherein no consecutively deposited optical layers have the same refractive index, each of the plurality of optical layers having a thickness chosen based on a random number within a predetermined range,

wherein an optical non-uniformity in one direction is introduced by a manufacturing method for each pixel, defined as a unit area on the hyperspectral filter array,

wherein the hyperspectral array is divided into a plurality of pixels and the optical non-uniformity is permanently formed in the hyperspectral filter array as plastic deformation resulting in a random formation for each pixel thus resulting in a different spectral response due to a different layered structure for each pixel,

wherein transmission spectra from each pixel having the different layered structure, and wherein a pairwise comparison of transmission spectra of any two pixels has an average correlation coefficient less than 0.2.