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Image measuring method of fabric crease recovery angle

A technology of image measurement and recovery angle, which is used in measurement devices, material analysis by optical means, instruments, etc., can solve the problems of manual reading interference, low stability of laser angle measurement results, and difficulty in accurately measuring the wrinkle recovery angle of fabrics.

Inactive Publication Date: 2017-08-18
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, manual readings are easily disturbed by human factors, the stability of laser angle measurement results is low, and the measurement range is limited to between 5° and 175°
Especially when the sample is bent, the existing methods are difficult to accurately measure the wrinkle recovery angle of the fabric

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Image measuring method of fabric crease recovery angle
  • Image measuring method of fabric crease recovery angle
  • Image measuring method of fabric crease recovery angle

Examples

Experimental program
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Embodiment Construction

[0019] Refer to the specific steps for the processing of measuring the return angle based on the image measurement method figure 1 . The main method is to calculate the mutual information value between the rotated image and the next frame image by rotating the previous frame image. When the wings achieve a good match, the angle through which the rotated image turns represents the difference between the original two frame images' restored angles.

[0020] Images acquired by the dynamic test system for fabric crease recovery performance (refer to figure 2 ) as an example, the image size is 1280 pixels × 960 pixels, and the midpoint of the free wing in the last row of the image is defined as the center of rotation, because the distance between this point and the crease line is relatively short, and it has no effect on the detection of the recovery angle.

[0021] In order to determine the position of the center point, the free wing must be clearly separated from the background...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention discloses an image measuring method of a fabric crease recovery angle. The method comprises the following steps: carrying out binaryzation processing on acquired fabric crease recovery images, so that test samples are segmented from a background; reconstructing the obtained binary images, so that a test sample crease position in the images is located in the center of the images, and the sizes of the reconstructed images are specified as squares; rotating the reconstructed image of a previous frame of image in a video sequence according to specified angle step size, and calculating interaction information between the rotated image and the reconstructed image of a next frame of image by adopting an image registration method, wherein a rotation angle of the previous frame of image corresponding to a peak value of the interaction information is a recovery angle differential value of the two frames of images, and a crease recovery angle of each frame of image is the sum of the rotation angles of all images ahead of the image in the same video sequence relative to the last frame of image.

Description

technical field [0001] The invention relates to the field of fabric quality testing methods, in particular to a testing method for fabric wrinkle recovery performance. Background technique [0002] Fabric wrinkle recovery performance is one of the important indicators to evaluate the usability of fabrics, which affects the shape retention and service life of fabrics. The current standards for evaluating the wrinkle recovery performance of fabrics mainly include ISO 2313-1972, AATCC66-2008 and GB / T3819-1997. The sample is folded after being pressurized by a weight, and the angle formed by the two wings of the sample after free release for a specified time is evaluated. performance. [0003] At present, in the field of textile quality assessment, the angle data at the 5th minute of the recovery process is obtained through manual reading or laser angle measurement. However, manual readings are easily disturbed by human factors, the stability of laser angle measurement results...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84
CPCG01N21/84G01N2021/8444
Inventor 王蕾潘如如高卫东
Owner JIANGNAN UNIV