The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 1991
Filed:
Feb. 05, 1991
Gary L Engle, Fair Oaks, CA (US);
Loredan Biomedical, Inc., Davis, CA (US);
Abstract
A video motion analysis system wherein a camera converts an image of a body having illuminated markers placed thereon into a plurality of image frames. Each image frame comprises a plurality of image lines, and each image line comprises a plurality of pixels. An image preprocessor receives the plurality of image lines and detects the occurrence of each marker in each image line. This is done by comparing each pixel amplitude value to a threshold value and indicating when the pixel amplitude value exceeds the threshold value. When a pixel amplitude value exceeds the threshold value, an offset value representing the difference between the pixel amplitude value and the threshold value is added to a running total of amplitude values for the detected marker. Similarly, the offset value is used to calculate the moment value for each pixel in each marker based on the position of the pixel in the scan line. The calculated moment value is added to a running total of moment values for the detected marker. The amplitude and moment sums for each series of pixels for each marker in each image line are passed to a signal processor which groups the amplitude and moment sums for each marker together. The grouped values are used to calculate a centroid value for each marker. Centroid calculation is performed in real time and the resulting values are provided to a master CPU for further processing.