Pattern processing system

• US 5,204,913 A
• Filed: 03/13/1992
• Issued: 04/20/1993
• Est. Priority Date: 09/16/1987
• Status: Expired due to Fees

• Current Assignee: JUKI Corporation
• Original Assignee: JUKI Corporation
• Inventors: Aida, Ken, Morooka, Hiroaki, Watanabe, Hirokazu
• Primary Examiner(s): Boudreau, Leo H.
• Application Number:
  US07/852,935
• Time in Patent Office: 403 Days
• Field of Search: 382/46, 382/48, 382/8, 382/44, 382/41, 364/470
• US Class Current: 382/111
• CPC Class Codes: A41H 3/007 Methods of drafting or marking-out patterns using computers computer-aided design G06F30/00
• CPC Class Codes: A41H 43/02 Handling garment parts or blanks, e.g. feeding, piling, separating or reversing
• CPC Class Codes: B26D 2005/002 Performing a pattern matching operation
• CPC Class Codes: B26D 5/007 Control means comprising cameras, vision or image processing systems
• CPC Class Codes: B26D 7/015 for sheet material or piles of sheets B26D7/018 and B26D7/02 take precedence
• CPC Class Codes: G05B 19/4083 Adapting programme, configuration
• CPC Class Codes: G06V 10/421 by analysing segments intersecting the pattern

Abstract

Disclosed is a pattern recognition apparatus in which a piece of cloth having a pattern is photographed by a camera, the resultant pixel data are stored in an image memory, the pixel data are sequentially read out along a plurality of predetermined angles, and the pattern is recognized on the basis of an addition value or a variance value in respect of the pixel data. Also provided is an apparatus for correcting the position of each piece of cloth on the basis of the result of the pattern recognition and for holding the corrected cloth in a piled state.

Claims

1. A pattern processing system comprising:

means for photographing an internal pattern inherent to at least a part of a piece of cloth having an outline, with the pattern located within the outline and comprising a plurality of spaced lines;

an image memory for storing image data obtained by said photographing means as digital pixel data indicative of luminance;

read address control means for sequentially designating addresses to read out said digital pixel data stored in said image memory from a read start address in the direction of a Y coordinate along each of a plurality of different reading angles; and

recognition means for sequentially reading out the digital pixel data for every reading angle in accordance with the address indicated by said read address control means and for detecting the existing position and angle of the lines of said pattern on the basis of a plurality of maximum and minimum values which represent the results of addition obtained by successively adding said digital pixel data read out from said image memory.

2. A pattern processing system comprising:

means for photographing an internal pattern inherent to at least a part of a piece of cloth having an outline, with the pattern located within the outline and comprising a plurality of spaced lines;

an image memory for storing image data obtained by said photographing means as digital pixel data indicative of luminance;

read address control means for sequentially designating addresses to read out said digital pixel data stored in said image memory from a read start address in the direction of a Y coordinate along each of a plurality of different reading angles; and

recognition means for sequentially reading out the digital pixel data for every reading angle in accordance with the addresses indicated by said read address control means, for successively adding said digital pixel data read out by the recognition means, for obtaining a variance for a mean value of a plurality of addition data at every angle which have been added together, and for detecting the existing position and the angle of said pattern on the basis of the maximum value of said variance.

3. A pattern processing system comprising:

means for photographing an internal pattern inherent to at least a part of a piece of cloth having a curved line pattern and an outline, with the pattern located within the outline and comprising a plurality of spaced lines;

an image memory for storing image data obtained by said photographing means as digital pixel data;

read address control means for sequentially designating addresses to read out said digital pixel data stored in said image memory from a read start address in the direction of a Y coordinate along each of different reading angles for every reading area derived by dividing said image memory into a plurality of reading areas at regular intervals in the direction of the Y coordinate; and

recognition means for detecting the existing position and the angle of said curved pattern on the basis of maximum and minimum values of a plurality of results of addition obtained by successively adding digital pixel data read out by sequentially reading out the digital pixel data for every one of said reading angles in accordance with the addresses indicated by said read address control means for every one of said reading areas or on the basis of a maximum value of a variance for a mean value of a plurality of additional data at every angle which are derived by said addition.

4. A pattern processing system comprising:

a mounting base on which roughly cut pieces of cloth are piled;

a pattern recognition section having means for photographing an internal pattern inherent to at least a part of a piece of cloth having an outline, with the pattern located within the outline and comprising a plurality of spaced lines;

an image memory for storing image data obtained by said photographing means as digital pixel data indicative of luminance, read address control means for sequentially designating addresses to read out said digital pixel data stored in said image memory from a read start address in the direction of a Y coordinate along each of a plurality of different reading angles, and recognition means for sequentially reading out the digital pixel data for every reading angle in accordance with the addresses indicated by said read address control means and for detecting the existing position and angle of said pattern on the basis of a plurality of maximum and minimum values as the results of addition obtained by successively adding said digital pixel data read out by said recognition means;

correcting means for moving the mounting base so as to correct the position of said piece of cloth such that the existing position and angle of said pattern recognized by said pattern recognition section are always set at the same position and angle for each of a plurality of said pieces of cloth; and

fixing and holding means for holding each of the pieces of cloth in a state in which the angle and position of the pattern have been corrected by said correcting means.

5. A pattern processing system comprising:

a mounting base on which roughly cut pieces of cloth are piled;

a pattern recognition section having means for photographing an internal pattern inherent to at least a part of a piece of cloth having an outline, with the pattern located within the outline and comprising a plurality of spaced lines;

an image memory for storing image data obtained by said photographing means as digital pixel data indicative of luminance, read address control means for sequentially designating addresses to read out said digital pixel data stored in said image memory from a read start address in the direction of a Y coordinate along each of a plurality of different reading angles, and recognition means for sequentially reading out the digital pixel data for every angle in accordance with the addresses indicated by said read address control means, for successively adding said digital pixel data read out by said recognition means, for obtaining a variance for a mean value of a plurality of addition data at every angle which have been added, and for detecting the existing position and the angle of said pattern on the basis of the maximum value of said variance;

correcting means for moving the mounting base so as to correct the position of said pieces of cloth such that the existing position and angle of said pattern recognized by said pattern recognition section are always set at the same position and angle for each of the pieces of cloth; and

fixing and holding means for holding each of the pieces of cloth in a state in which the angle and position of the pattern have been corrected by said correcting means.

6. A pattern processing system comprising:

a mounting base on which roughly cut pieces of cloth are piled;

a pattern recognition section having means for photographing an internal curved line pattern inherent to at least a part of a piece of cloth having an outline, with the pattern located within the outline and comprising a plurality of curved lines;

an image memory for storing image data obtained by said photographing means as digital pixel data indicative of luminance, read address control means for sequentially designating addresses to read out said digital pixel data stored in said image memory from a read start address in the direction of a Y coordinate along each of different reading angles for every reading area derived by dividing said image memory into a plurality of reading areas at regular intervals in the direction of the Y coordinate, and recognition means for detecting the existing position and the angle of said curved pattern on the basis of maximum and minimum values which represent the results of addition obtained by successively adding the digital pixel data which are read out by sequentially reading out the digital pixel data for every said reading angle in accordance with the addresses indicated by said read address control means for every said reading area;

correcting means for moving the mounting base so as to correct the position of said pieces of cloth such that the existing position and angle of said pattern recognized by said pattern recognizing section are always set at the same position and angle for each of the pieces of cloth; and

fixing and holding means for holding each of the pieces of cloth in a state in which the angle and position of the pattern have been corrected by said correcting means.

7. In an automated system for processing patterns inherent to at least part of a piece of cloth, a method of determining the position and angle of lines within the pattern, comprising:

producing an image of the pattern;

converting the produced image into a plurality of digital pixels, each digital pixel being indicative of the luminance of a corresponding portion of the produced image;

storing each of the digital pixels in a storage means;

reading from the storage means the digital pixels stored in the storage means from a read start address in the direction of a Y coordinate along each of a plurality of different reading angles; and

detecting the position and angle of the lines of the pattern on the basis of a plurality of results of addition obtained by successively adding the digital pixels read out from the storage means.

8. A method in accordance with claim 7 wherein the detecting step comprises:

calculating a sum of the digital pixels read from the storage means along each of the plurality of reading angles;

calculating a variance for each of the plurality of sums of digital pixels calculated in the preceding step; and

detecting the position and angle of the lines of the pattern on the basis of maximum value of variance.