Recent studies of transform image enhancement

Sabzali Aghagolzadeh; Okan K. Ersoy

doi:10.1117/12.59450

1 June 1992 Recent studies of transform image enhancement

Sabzali Aghagolzadeh, Okan K. Ersoy

Proceedings Volume 1652, Medical Imaging VI: Image Processing; (1992) https://doi.org/10.1117/12.59450
Event: Medical Imaging VI, 1992, Newport Beach, CA, United States

Abstract

Blockwise transform image enhancement techniques are discussed. It is shown that the best transforms for transform image coding, namely, the scrambled real discrete Fourier transform, the discrete cosine transform, and the discrete cosine-III transform, are also the best for image enhancement. Three techniques of enhancement discussed in detail are alpha- rooting, modified unsharp masking, and filtering motivated by the human visual system response (HVS). With proper modifications, it is observed that unsharp masking and HVS- motivated filtering without nonlinearities are basically equivalent. Block effects are completely removed by using an overlap-save technique in addition to the best transform.

Citation Download Citation

Sabzali Aghagolzadeh and Okan K. Ersoy "Recent studies of transform image enhancement", Proc. SPIE 1652, Medical Imaging VI: Image Processing, (1 June 1992); https://doi.org/10.1117/12.59450

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