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1 October 1992 Low-cost automatic contrast enhancement for digital x rays
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Digital x-ray imaging of the chest has been introduced in an attempt to alleviate some of the limitations of conventional radiography. The digital techniques permit software processing of stored data to compensate for factors such as exposure variation, rib and bone interposition, and density of overlying tissue. However, the digital approach introduces its own set of limitations, principally involving spatial and intensity resolution, and dynamic range. For presently-available displays, an intensity range of 256 levels (8 bits) is the maximum practical dynamic range; however using present contrast enhancement methods this is inadequate for many diagnostic purposes. This paper investigates the comparative performance and the efficient implementation, using low-cost personal computers and digital signal processors, of existing and a new method of adaptive histogram equalization that facilitate the display of 12 bit or 16 bit digital x-rays on 8-bit displays. Results showing the quality of the various methods and the associated computational cost are included.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dimitris G. Manolakis, John A. Orr, and An-Loong Kok "Low-cost automatic contrast enhancement for digital x rays", Proc. SPIE 1705, Visual Information Processing, (1 October 1992);

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