Showing papers on "Histogram equalization published in 1974"
01 Dec 1974
TL;DR: Two enhancement techniques developed and optimized for contrast enhancement are Local Area Brightness and Gain Control (LABGC) and Local Area Histogram Equalization (LAHE).
Abstract: : The major objective of this research program was to develop and evaluate three techniques for the real-time enhancement of sensor displays in the airborne cockpit environment. Two enhancement techniques developed and optimized for contrast enhancement are Local Area Brightness and Gain Control (LABGC) and Local Area Histogram Equalization (LAHE). Haar Transform Crispening (HTC) is another technique that was developed and optimized during this program. HTC may be used to sharpen edges in an image which are blurred due to misfocused optics or MTF roll-off. An evaluation of the enhancement techniques includes subjective evaluations for specific operator tasks and a comparison of mechanization complexities. Photographs of original and enhanced images are included.
60 citations
TL;DR: In this article, two-dimensional Fourier filtering, intensity thresholding, and histogram equalization techniques are compared and analyzed for digitized solar X-ray photography, and possible applications of these digital techniques to solar photography interpretation are suggested.
Abstract: Digital enhancement techniques are applied to digitized solar X-ray photography. Two-dimensional Fourier filtering, intensity thresholding, and histogram equalization techniques are described, and their effects on the X-ray image are compared and analyzed. Possible applications of these digital techniques to solar photography interpretation are suggested.