Device for scanning an X-ray image

Image analysis – Image enhancement or restoration – Image filter

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382264, 358464, 358463, H04N 1409

Patent

active

060582200

ABSTRACT:
A device for scanning an X-ray image where a previously locally uniformly charged photoconductor (1) is discharged in dependence on the local intensity, utilizing several electrometer probes which are arranged in a row and which line-wise scan the charge pattern of the photoconductor (1) which is successively displaced in the scanning direction, extending perpendicular to the line direction, the probes supplying, for each pixel, an image value which corresponds to a discharge at the relevant pixel. In order to eliminate streaky artefacts, the image values are applied to an analog-to-digital converter (5), the converted values being stored in an image memory (6), there being provided a signal processor (7) which subjects the image values of neighboring pixels in an image line to a low-pass filter function and which subjects the image values of pixels neighboring one another in the scanning direction to a high-pass filter function.

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IEEE International Conference on Acoustics, Speech, and Signal Processing, Proceedings, Mar. 26-29, 1985 pp. 684-687, Tao et al.

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