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System and method for measuring leather area based on digital image method

A digital image and leather technology, which is applied in the system field of measuring leather area based on the digital image method, can solve the problems of inconvenient industrial use, high cost, and low measurement accuracy, and achieve the advantages of easy industrial use, low cost, and high measurement accuracy Effect

Inactive Publication Date: 2009-04-08
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the smaller the unit area is divided, the more difficult it is. In fact, it is difficult to achieve the ideal accuracy.
The instrument has high cost, low measurement accuracy, relative error ≥ 3%, and complex operation. Before measurement, the instrument needs to be calibrated multiple times with a standard plate, and continuous measurement is not possible, which is not convenient for industrial use.

Method used

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  • System and method for measuring leather area based on digital image method
  • System and method for measuring leather area based on digital image method
  • System and method for measuring leather area based on digital image method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for measuring leather area based on a digital image method, comprising the steps of:

[0031] The first step is to select a known area S=1135mm 2 For a round object, use the system to calibrate and measure it, and take the average value of 5 measurements to get its pixel number M=19452, and then use the formula ε=S / M to calculate the pixel equivalent of the system ε=0.058348755911988mm 2 / pixel.

[0032] The second step is to use a pair of image acquisition equipment lenses with an area of ​​1620mm 2 The leather to be tested is imaged, and the acquired image is input into the computer 4 through the CCD camera 2 and the image acquisition card 3 to obtain the image of the leather to be tested.

[0033] The third step is to use the median filter in the image processing software algorithm to denoise the obtained image in the computer to reduce the image noise.

[0034] The fourth step is to use an iterative method to select an optimal threshold, and set the gray...

Embodiment 2

[0039] A method for measuring leather area based on a digital image method, comprising the steps of:

[0040] The first step is to select a known area S=1135mm 2 For a round object, use the system to calibrate and measure it, and take the average value of 5 measurements to get its pixel number M=19452, and then use the formula ε=S / M to calculate the pixel equivalent of the system ε=0.058348755911988mm 2 / pixel.

[0041] The second step is to use a pair of image acquisition equipment lenses with an area of ​​2730mm 2 The leather to be tested is imaged, and the acquired image is input into the computer 4 through the CCD camera 2 and the image acquisition card 3 to obtain the image of the leather to be tested.

[0042] The third step is to use the median filter in the image processing software algorithm to denoise the obtained image in the computer to reduce the image noise.

[0043] The fourth step is to use an iterative method to select an optimal threshold, and set the gray...

Embodiment 3

[0048] A method for measuring leather area based on a digital image method, comprising the steps of:

[0049] The first step is to select a known area S=1135mm 2 For a round object, use the system to calibrate and measure it, and take the average value of 5 measurements to get its pixel number M=19452, and then use the formula ε=S / M to calculate the pixel equivalent of the system ε=0.058348755911988mm 2 / pixel.

[0050] The second step is to use a pair of image acquisition equipment lenses with an area of ​​1315mm 2 The leather to be tested is imaged, and the acquired image is input into the computer 4 through the CCD camera 2 and the image acquisition card 3 to obtain the image of the leather to be tested.

[0051] The third step is to use the median filter in the image processing software algorithm to denoise the obtained image in the computer to reduce the image noise.

[0052] The fourth step is to use an iterative method to select an optimal threshold, and set the gray...

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Abstract

The invention provides a leather area measuring system and a method based on a digital image method, which comprises a CCD video camera connected with an image acquisition device lens, the CCD video camera is connected with an image collection card and a computer; the measurement steps comprise: first, calibrating the system to gain the system pixel equivalent Epsilon, and the practical dimension represented by unit pixel, second, obtaining the gray image of the leather to be measured, third, denoising the gray image, fourth, converting the gray image to a binary image using an iterative threshold method, and separating the object from the background area, fifth, denoising the image for a second time, sixth, processing a leather image by a vector analysis method, and obtaining the edge outline and the pixel number of the object area, and seventh, calculating the leather area to be measured. The invention has the advantages of low cost, non-contact, high measuring precision, and convenient industrial use.

Description

technical field [0001] The invention belongs to the technical field of leather area measurement, in particular to a system and method for measuring leather area based on a digital image method. Background technique [0002] In the process of leather product preparation, leather is priced by area. If there is no fast and accurate area measuring instrument and equipment, large errors will occur in the process of leather product preparation. In leather trading, it will also lead to a certain degree of economic loss. [0003] At present, the leather measuring machine is widely used to measure the area of ​​leather. This instrument is composed of a photoelectric conversion circuit and a series of integrated circuits. Its measurement principle is to differentiate the leather and then accumulate the summation. That is to say, the leather is divided into unit areas of equal size, and then the presence or absence of leather is converted into the level of "1" or "0" by using a photoe...

Claims

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Application Information

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IPC IPC(8): G01B11/28G06T7/00
Inventor 党宏社洪英宋晋国
Owner SHAANXI UNIV OF SCI & TECH
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