Image analysis – Histogram processing – For setting a threshold
Patent
1981-06-30
1984-02-07
Krass, Errol A.
Image analysis
Histogram processing
For setting a threshold
358105, 364414, 382 6, H04N 532, G06F 1542
Patent
active
044307497
ABSTRACT:
The method and apparatus furnish difference images from a video signal which contains a sequence of images that are obtained from a patient under examination. First a first of the images contained in the video signal is recorded in a first storage device. Thereby a so-called primary mask is formed. Then, a subsequent second of the images contained in the video signal is recorded in a second storage device. Subsequently, a third of these images is recorded in a third storage device. From here on, images contained in the video signal following the third image are recorded alternatingly in the second and the third storage device. At a certain point of time, a signal for starting data acquisition is provided. Simultaneously or thereafter, a so-called secondary mask is selected. The secondary mask is an image completely recorded in the second or third storage device shortly prior to the generation of the data acquisition signal. This secondary mask is subtracted from those images contained in the video signal which appear after the data acquisition signal has been generated. Thereby the afore-mentioned difference images are formed for display.
REFERENCES:
patent: 3894181 (1975-07-01), Mistretta et al.
patent: 4002910 (1977-01-01), LeMay
patent: 4217641 (1980-08-01), Naparstek
patent: 4323973 (1982-04-01), Greenfield
patent: 4335427 (1982-06-01), Hunt et al.
patent: 4355331 (1982-10-01), Georges et al.
Krass Errol A.
Milde Jr. Karl F.
Siemens Gammasonics Inc.
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