Method for compressing the dynamic range of digital projection r

Details Method for compressing the dynamic range of digital projection r Method for compressing the dynamic range of digital projection r

1997-11-04

2000-05-30

Tran, Phuoc

Image analysis

Image enhancement or restoration

Image filter

382263, 382264, 382130, G06K 940

Patent

active

060699795

ABSTRACT:
A method for compressing the dynamic range of a digital radiographic image comprising the steps of: providing an original digital radiographic image; processing the original digital radiographic image with an unsharp masking technique to produce a low frequency digital radiographic image having low frequency components; subtracting the low frequency digital radiographic image from the original digital radiographic image to produce a high frequency digital radiographic image; multiplying the low frequency image by a first gain factor and the high frequency image by a second gain factor to produce respective modified low and high frequency images; combining the modified low and high frequency images with a mid-range image to produce an output digital image; and passing the output digital image through a look-up table to render an image with code values that represent optical density of a printed or displayed rendering of the image.

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patent: 5461655 (1995-10-01), Vuylsteke et al.
patent: 5774599 (1998-06-01), Muka et al.
patent: 5805721 (1998-09-01), Vuylsteke et al.
Sezan et al., "Automatic Anatomically Selective Image Enhancement in Digital Chest Radiography," IEEE Transactions on Medical Imaging, vol. 8, No. 2, Jun. 1989.

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