Determination of the relative visibility thresholds for basis functions of the Frazier-Jawerth transform

John B. Zimmerman; Rosalie J. Hagge; Karin M. Hartzell

doi:10.1117/12.18864

1 July 1990 Determination of the relative visibility thresholds for basis functions of the Frazier-Jawerth transform

John B. Zimmerman, Rosalie J. Hagge, Karin M. Hartzell

Proceedings Volume 1232, Medical Imaging IV: Image Capture and Display; (1990) https://doi.org/10.1117/12.18864
Event: Medical Imaging '90, 1990, Newport Beach, CA, United States

Abstract

A new method for spatial-frequency analysis, the Frazier-Javierth transform (FJT), has recently been introduced which allows the simultaneous encoding of image properties in both the space and frequency domains. This technique appears to have applicability to the problem of image data compression, in a way similar to the Fourier transform or discrete cosine transform. A necessary step in the development of an FJT compression algorithm is to produce a method for appropriately quantizing the FiT coefficients. The current work undertakes the measurement of the thresholds for the visual detection of the FJT basis functions. These results will be used in the development of a psychovisually-based quantizer. The thresholds were determined by the use of psychovisual observer experiments. It is shown that the detectability of the basis functions is in accord with current knowledge of the spatial frequency sensitivity of the human visual system. However, these results are not predictable from simple psychovisual models, and because of the frequency domain behavior of the FJT, the measured values must be corrected before they can be used in a quantizer. The corrected values imply that the FJT quantizer may not match the properties of ordinary images as well as the psychovisual quantizers used for such methods as the discrete cosine transform.

Citation Download Citation

John B. Zimmerman, Rosalie J. Hagge, and Karin M. Hartzell "Determination of the relative visibility thresholds for basis functions of the Frazier-Jawerth transform", Proc. SPIE 1232, Medical Imaging IV: Image Capture and Display, (1 July 1990); https://doi.org/10.1117/12.18864

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