Extending the Universal Quality Index to assess N-image fusion in optical microscopy

Filippo Piccinini, A. Tesei, W. Zoli, Ludovico Carozza, D. Pollini, Alessandro Bevilacqua

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The depth of focus is a constraint of all the light microscopes, being not possible to acquire a single, completely in-focus, image of 3D objects characterized by a wide depth dimension. Since the seventies, many methods have been proposed to extend the microscope’s depth of focus. However, it is difficult to define which method yields the best result because there is not a tested metric and a validated approach to compare them using a set of images lacking of a reference ground truth. Typically, the Universal Quality Index (UQI) is used to evaluate output’s quality in image processing, but it requires a reference ground truth. Some UQI extensions were proposed to evaluate the output of fusion methods without a ground truth, but no exhaustive analysis was proposed to prove their equivalence, in terms of evaluation performance, to the standard UQI. In this work, first we prove that the output of the UQI extensions proposed is different from the UQI’s one, then we provide and validate a new approach to evaluate extended depth of focus methods, such as the UQI would do, but without requiring a reference ground truth.
Original languageEnglish
Title of host publicationProceedings of the 7th IEEE International Workshop on Biosignal Interpretation (IEEE BSI2012)
Number of pages4
Publication statusPublished - 2012
Event7th International Workshop on Biosignal Interpretation - Como, Italy
Duration: 2 Jul 2012 → …


Conference7th International Workshop on Biosignal Interpretation
Abbreviated titleBSI 2012
Period2/07/12 → …


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