Method and apparatus for measuring lengths on an article
AssigneeDe Montfort University
InventorLeonard Norton-Wayne
Life of this patent
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Abstract
A method and apparatus measure lengths on an article such as a garment by arranging the article in a field of view of an imaging device, e.g. a video camera forming a pixel image in an x-y array, identifying measurement points on the pixel image in terms of x and y coordinates of the array and evaluating actual lengths between identified measurement points by carrying out for example in a computer appropriate Pythagorean calculations based on the the coordinates and modified to correct for scale and system distortions. Measurement points can be identified by marking the article. The method and apparatus are of use for example in the measurement of shrinkage.
Claims22
A method for measuring lengths on a flexible textile article with the aid of data processing means including a digital computer, comprising the steps of
- (a) arranging the article flat on a table for measurement in a field of view of an imaging device which forms a pixel image in an x-y array,
- (b) forming by said imaging device a pixel image of the so-arranged article,
- (c) identifying measurement points on said pixel image in terms of x and y coordinates of said array,
- (d) using said digital computer for applying correction algorithms to the x and y coordinates thus identified to yield new x and y coordinates corrected for scale and system distortions, and
- (e) further using said digital computer for evaluating actual lengths between identified measurement points on said article by carrying out appropriate Pythagorean calculations based on said new, corrected x and y coordinates.
A method for measuring lengths on a flexible article which can be laid flat, said method comprising the steps of
- (a) arranging the article for measurement on a table in a field of view of an imaging device which forms a pixel image in an x-y array,
- (b) with the table backlit forming by said imaging device a pixel image of the so arranged article,
- (c) identifying measurement points by marking the article on said pixel image in terms of x and y coordinates of said array,
- (d) applying correction algorithms to the x and y coordinates thus identified to yield new x and y coordinates corrected for scale and system distortions, and
- (e) evaluating actual lengths between identified measurement points on said article by carrying out appropriate Pythagorean calculations based on said new, corrected x and y coordinates.
Dependencies are inferred from the claim text.