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Proceedings Paper

Real-Time Distortion Correction Of Digital X-Ray II/TV Systems: An Application Example
Author(s): P. Haaker; E. Klotz; R. Koppe; R. Linde
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Paper Abstract

In X-ray image intensifier (II)/TV-camera systems geometric distortions occur, e.g. due to the curved input screen of the II. For methods which are based on a pixelwise comparison of images, e.g. digital angiotomosynthesis, an accurate correction of these geometric distortions is absolutely necessary. For the application of tomosynthesis to coronary angiography the correction in addition has to be done in real-time, because the recon-struction of the three dimensional structure of the blood vessels has to be done while the patient is undergoing catheterization. This paper describes a digital correction unit which allows a large variety of geome-tric distortions to be corrected. It consists of an input memory for storing the distorted image, an output memory for storing the corrected image and a special address memory which will serve as an address table during the correction step. For each element of the output image the location of the corresponding element of the distorted input image is determined in a preprocessing step and stored in the address memory. The actual correction of an image is then done while the image is copied from the input into the output memory. In this way 512x512 images can be corrected in real-time by a 32-bit 68020-based micro-processor system.

Paper Details

Date Published: 2 March 1989
PDF: 6 pages
Proc. SPIE 1027, Image Processing II, (2 March 1989); doi: 10.1117/12.950292
Show Author Affiliations
P. Haaker, Philips GmbH Forschungslahoratorium Hamburg (FRG)
E. Klotz, Philips GmbH Forschungslahoratorium Hamburg (FRG)
R. Koppe, Philips GmbH Forschungslahoratorium Hamburg (FRG)
R. Linde, Philips GmbH Forschungslahoratorium Hamburg (FRG)

Published in SPIE Proceedings Vol. 1027:
Image Processing II
Peter J.S. Hutzler; Andre J. Oosterlinck, Editor(s)

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