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Method for Encoding Multiple Symbols on Stoppers

IP.com Disclosure Number: IPCOM000241595D
Publication Date: 2015-May-14
Document File: 4 page(s) / 194K

Publishing Venue

The IP.com Prior Art Database

Abstract

It is desired to identify the type of container drug product by laser etching a symbol on the rubber stopper which is part of the container. Use of alphanumeric symbols to encode the information is problematic since available symbols introduced can cause cross confusion with the prior symbols used. 2D Matrix printed on the rubber stoppers is the preferred method at present. A method of encoding that is designed to be quickly readable by machine vision could still be needed, in the event factors prevent the use of 2D Matrix symbols. A symbol similar to a 2d matrix is possible by using a scheme wherein 2 octal digits will be binary encoded on a static field.

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Method for Encoding Multiple Symbols on Stoppers

Background

It is desired to identify the type of container drug product by laser etching a symbol on the rubber stopper which is part of the container.  Use of alphanumeric symbols to encode the information is problematic since available symbols introduced can cause cross confusion with the prior symbols used.  2D Matrix printed on the rubber stoppers is the preferred method at present.  A method of encoding that is designed to be quickly readable by machine vision could still be needed, in the event factors prevent the use of 2D Matrix symbols.

Human readability of symbols is not as important since the symbols are not visible in the final assembly on the stopper; however, human decoding of the symbols may be required in the event of complaint resolution.

A symbol similar to a 2d matrix is possible by using a scheme wherein 2 octal digits will be binary encoded on a static field.

Static Field

The static field will be similar to the following image of Fig. 1.  The static field will be searched out in the image to learn the rotation and size of the symbol.  It is important that the static field be a shape that cannot appear in any symbol.

Fig. 1 Static Field Image

Encoding

The 2 octal digits will be encoded as ‘legs’ extending from the static field.  The number encoded in Fig. 2 is 21 decimal, or 25 octal.

Fig. 2 Encoding for 25 octal

The encoding scheme is diagrammed in the image of Fig. 3.  This shows the way a symbol for 21 decimal will be encoded as its equivalent 25 octal.  This involves binary encoding of the digits ‘2’ as most significant digit, and ‘5’ as least significant digit.

Fig. 3 Encoding scheme for 25 octal

So to decode the symbol, the first step is to find the Static Bar pattern.  This pattern will enable the vision system to locate and scale the symbol.  Also finding the Static Bar will allow regions to be placed to use simple line finding tools to process...