Objective characterization of image acutance

Salaheddin G. Elkadiki; Rangaraj M. Rangayyan

doi:10.1117/12.171744

1 April 1994 Objective characterization of image acutance

Salaheddin G. Elkadiki, Rangaraj M. Rangayyan

Proceedings Volume 2166, Medical Imaging 1994: Image Perception; (1994) https://doi.org/10.1117/12.171744
Event: Medical Imaging 1994, 1994, Newport Beach, CA, United States

Abstract

Acutance refers to the sharpness and thus the perceptibility of features in an image. Currently available methods for characterization of perceptibility of image features are either highly subjective or statistical. There is a need for a purely objective measure to characterize the perceptibility of image features. This paper proposes a measure of acutance based on gray-level variations across the boundary of an object. An algorithm to calculate the acutance based on region growing and a derivative measure across region boundaries has been designed and implemented. After testing the algorithm on various images, it is shown that this measure can accurately reflect changes in the appearance of objects due to blurring and sharpening. Using this technique, it is possible to quantify the level of enhancement in a digital image by calculating the acutance before and after the enhancement operation.

Citation Download Citation

Salaheddin G. Elkadiki and Rangaraj M. Rangayyan "Objective characterization of image acutance", Proc. SPIE 2166, Medical Imaging 1994: Image Perception, (1 April 1994); https://doi.org/10.1117/12.171744

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