Enhancement of digital images for electronic displays

Details Enhancement of digital images for electronic displays Enhancement of digital images for electronic displays

1991-12-18

1999-05-18

Kelley, Christopher S.

Image analysis

Image transformation or preprocessing

Changing the image coordinates

358429, 358451, G06K9/32

Patent

active

059058200

ABSTRACT:
A method and apparatus for enhancing an image for a display, first digitizes the image to produce a map of the image, this map containing pixels having 2.sup.n grey levels where n is the number of bits per pixel. The map of the image is then downsampled to produce a downsampled map of the image. Thresholding is then performed on the downsampled map of the image to reduce the number of bits per pixel from n bits to m bits to produce a thresholded downsampled map of the image, where m is less than n. The number of bits per pixel is restored from m bits to p bits, where p is greater than m, to produce a restored thresholded downsampled map of the image. The restored thresholded downsampled map of the image can be downsampled again to produce an image map suitable for display on a low to moderate cost display, such as a CRT, with grey scale capability. The displayed image has an enhanced appearance, since it is high fidelity with respect to the original.

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patent: 5138672 (1992-08-01), Hirabayashi et al.
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