1 June 1992 Recent studies of transform image enhancement
Author Affiliations +
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.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sabzali Aghagolzadeh, Sabzali Aghagolzadeh, Okan K. Ersoy, Okan K. Ersoy, } "Recent studies of transform image enhancement", Proc. SPIE 1652, Medical Imaging VI: Image Processing, (1 June 1992); doi: 10.1117/12.59450; https://doi.org/10.1117/12.59450


Compression of digital chest x-rays
Proceedings of SPIE (June 30 1990)
RGB color enhancement using homomorphic filtering
Proceedings of SPIE (March 22 1995)
An improved algorithm of mask image dodging for aerial image
Proceedings of SPIE (November 23 2011)
Local contrast enhancement
Proceedings of SPIE (January 28 2007)

Back to Top