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Published in: Quantum Information Processing 3/2024

01-03-2024

A novel approach to threshold quantum images by using unsharp measurements

Authors: Ayan Barui, Mayukha Pal, Prasanta K. Panigrahi

Published in: Quantum Information Processing | Issue 3/2024

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Abstract

We propose a hybrid quantum approach to threshold and binarize a grayscale image through unsharp measurements (UM) relying on image histogram. Generally, the histograms are characterized by multiple overlapping normal distributions corresponding to objects, or image features with small but significant overlaps, making it challenging to establish suitable thresholds. The proposed methodology uses peaks of the overlapping Gaussians and the distance between neighboring local minima as the variance, based on which the UM parameters are chosen, that maps the normal distribution into a localized delta function. To demonstrate its efficacy, subsequent implementation is done on noisy quantum environments in Qiskit. This process is iteratively repeated for a multimodal histogram to obtain more thresholds, which are then applied to various life-like pictures to get high-contrast images, resulting in comparable peak signal-to-noise ratio and structural similarity index measure values. The obtained thresholds are used to binarize a grayscale image by using novel enhanced quantum image representation integrated with a threshold encoder and an efficient quantum comparator (QC) that depicts the whole binarized picture. This approach significantly reduces the complexity of the proposed QC and of the whole algorithm when compared to earlier models.

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Metadata
Title
A novel approach to threshold quantum images by using unsharp measurements
Authors
Ayan Barui
Mayukha Pal
Prasanta K. Panigrahi
Publication date
01-03-2024
Publisher
Springer US
Published in
Quantum Information Processing / Issue 3/2024
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-024-04282-4

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