Ajit Singh

US Patent:

53092376, May 3, 1994

Filed:

Mar 31, 1992

Appl. No.:

7/861414

Inventors:

Ajit Singh - Plainsboro NJ

Assignee:

Siemens Corporate Research, Inc. - Princeton NJ

International Classification:

H04N 5213

US Classification:

348607

Abstract:

The present invention apparatus and method uses a recursive filter to estimate the instantaneous intensity and temporal rate of change in intensity for object points in consecutive images of an image-sequence. The estimates of the intensity and its temporal rate of change are updated for each new image in the image sequence. The amount of smoothing introduced by the recursive filter is dependant upon the estimates computed for the intensity and temporal rate of change. As such, the recursive filter corrects the image sequence in accordance with each new set of estimates. Since motion in an image-sequence is implicit in the rate of change of intensity, the recursive filter is able to achieve motion compensated enhancements.

US Patent:

55706983, Nov 5, 1996

Filed:

Jun 2, 1995

Appl. No.:

8/459148

Inventors:

Cheng-Chung Liang - Lawrenceville NJ
Ming Fang - Cranbury NJ
Ajit Singh - Plainsboro NJ

Assignee:

Siemens Corporate Research, Inc. - Princeton NJ

International Classification:

A61B 1300

US Classification:

128745

Abstract:

A system for monitoring eyes of an individual includes a human interface for obtaining images of the individual and for providing feedback to the individual and a processor for analyzing the images. The processor transforms an image sequence into a one dimensional signal by extracting relevant features from the images. Analysis of the signal generated then occurs to detect sleepiness. Transformation of the image sequence includes eye localization, eye tracking and eye motion signal generation. The system takes advantage of the relatively high horizontal-contrast density of the eye region to determine eye positions in a greyscale image of a human face.

US Patent:

55704042, Oct 29, 1996

Filed:

Sep 30, 1994

Appl. No.:

8/315524

Inventors:

Cheng-Chung Liang - Lawrenceville NJ
Ajit Singh - Plainsboro NJ
Ming-Yee Chiu - Princeton Junction NJ
Jay Ezrielev - Jersey City NJ
Richard Fisler - Kendall Park NJ
Dietmar Hentschel - Little Silver NJ

Assignee:

Siemens Corporate Research - Princeton NJ

International Classification:

A61B 603

US Classification:

378 8

Abstract:

A method for automatically editing a plurality of CT image slices to provide a three dimensional view of a selected object located within a patient's body comprises providing at least one slab of CT image slices produced by CT scanning system and computing a top MIP image of the slab. An undesirable object is automatically removed from the top MIP image by first detecting all the pixels having illuminating intensity values which represent the undesirable object. Then all the pixels of the object to be removed are set to a substantially zero illuminating intensity value in order to remove the object from the top MIP image of the slab. After the undesirable object is removed from the top MIP image, the edits made thereto are applied to each CT image slice in the slab. The present invention also includes apparatus for performing a 3D reconstruction of CT angiographic images to visualize a selected object located within a patient's body. The apparatus comprises an x-ray tube for projecting energy into a layer of interest in the patient's body and a detector for detecting changes in the projected energy as it exits the layer of interest.