Ornament surface area rapid detection method and system based on image analysis technique

An image analysis and detection method technology, applied in measuring devices, instruments, and optical devices, etc., can solve the problems of low precision, poor accuracy, and high cost, and achieve a faster detection process, reduced workload, and high accuracy. Effect

Inactive Publication Date: 2015-05-06
ELECTROMECHANICAL PRODS DETECTING TECH CENT OF SHANGHAI ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] The detection of nickel release needs to calculate the surface area of ​​the sample soaked, and the usual method of measuring the soaked surface area is to divide the sample into several regular parts and add them up after manual measurement. The disadvantage of this method is that the surface area of ​​the sample is irregular. There are difficulties. The second is that manual measurement is time-consuming and labor-intensive, and the accuracy is poor, especially when the result of nickel release is on the verge of passing or failing.
However, the above methods have disadvantages: the moiré fringe method cannot automatically determine the fringe peak value and fringe series when the computer automatically processes it, nor can it automatically identify the surface concavity and convexity of the object. It is suitable for the measurement of the curved surface of the object, but the measurement accuracy is not high enough; Stereo camera measurement is in line with human visual characteristics, but it is difficult to measure concave surfaces, and the accuracy is not high, so there are few applications; infrared measurement equipment is not widely used, and is mostly used for scientific and educational research
The optical path system of the 3D camera has a complex structure, bulky size, and high cost, making it difficult to popularize and apply in the field of mass consumption
The laser measurement method has high precision and is an ideal measurement method, but the laser measurement equipment is quite expensive, and equipment maintenance and operation require considerable manpower and material resources. The later point cloud processing is complicated and the efficiency is low; 3D technology currently mainly uses Active detection (such as TC2), using structured light scanning to obtain object point cloud information to reconstruct 3D shape, has the disadvantages of low efficiency, high cost and limited size, which is not conducive to 3D reconstruction of small objects

Method used

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  • Ornament surface area rapid detection method and system based on image analysis technique
  • Ornament surface area rapid detection method and system based on image analysis technique
  • Ornament surface area rapid detection method and system based on image analysis technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] This embodiment selects the Creaform 3D Scan portable scanner, which has an accuracy of 0.1 mm and a measurement speed of 550,000 times / s. It can quickly and accurately reproduce the three-dimensional information of the object. It has the characteristics of lifelikeness and reproducibility. It can eliminate the shortcomings of traditional structured light imaging such as limited physical size, complicated acquisition, and high cost.

[0096] In order to illustrate the accuracy of the present invention's calculation, select a ring with a regular shape (such as Figure 6a and Figure 6b Shown) sample, utilize the present invention and traditional manual area measurement method to measure and calculate respectively, test data is compared.

[0097] Table 1: Manually measured ring size data (unit: mm)

[0098] diameter

width

16

3

[0099] According to the data in Table 1, the immersion area of ​​the ring sample is calculated as:

[0100] S...

Embodiment 2

[0109] In this embodiment, the surface area of ​​the more complicated necklace sample is detected, and the same calculation process as in Example 1 is adopted. The physical figure of the necklace sample is as follows Figure 7 shown.

[0110] Table 2: Manually measured life-size data (unit: mm)

[0111] necklace length

Necklace body width

buckle diameter

buckle thickness

nameplate length

Nameplate width

40

1

5

1

5

3

[0112] Necklace samples are more complicated than ring samples, and need to be decomposed to calculate the area. According to the shape of the necklace sample, it is roughly divided into three parts: the necklace body, which is approximately rectangular; the buckle, which is approximately circular; the nameplate, which is approximately rectangular. According to the manual test data in Table 2, we get:

[0113] 1. Necklace body area:

[0114] S 1 =2×(40×1)=80mm 2

[0115] 2. Buckle area:

[011...

Embodiment 3

[0125] In this embodiment, badge samples are selected, and the calculation process is the same as that in Example 1. Since the shape of the badge is irregular and the front surface has protrusions, the method of calculating the area by manual division is not only time-consuming and laborious, but also difficult to obtain accurate data. Using the present invention to measure and calculate the surface area, first use the Creaform 3D Scan portable scanner to align the simulated ornament. After a comprehensive scan, the effect after three-dimensional reconstruction is as follows: Figure 8a to Figure 8c shown.

[0126] Utilize the area calculation module of the present invention to measure and calculate the surface area, and the automatic calculation obtains that the surface area is 1,364.57 millimeters 2 , took 1 minute and 45 seconds, and successfully realized the 3D reconstruction and automatic calculation of the surface area of ​​complex shape ornaments.

[0127] In this exam...

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Abstract

The invention provides an ornament surface area rapid detection method based on an image analysis technique. The method includes the following steps: step A, scanning an ornament and collecting three-dimensional point cloud coordinate system information of the ornament; step B, forming a three-dimensional model through appearance reconstruction of the three-dimensional point cloud coordinate system of the ornament; step C, conducting gridding on the three-dimensional model; and step D, calculating and accumulating the area of each grid and obtaining the surface area of the ornament. Compare with hand computation, the ornament surface area rapid detection method is convenient and rapid in the whole detection process, high in accuracy, and capable of greatly reducing the detection workload and fastening the detection process for the ornament whose detection structure is relatively complicated.

Description

technical field [0001] The invention relates to a detection method for the surface area of ​​an article, in particular to a fast detection method and a detection system for the surface area of ​​a simulated ornament based on image analysis technology. Background technique [0002] Simulation jewelry, also called simulation jewelry, refers to the base material made of various metals other than gold, silver, palladium, platinum, rhodium and other precious metals and alloys (whether or not plated or containing precious metals, whether or not inlaid with gemstones or semi-precious stones) Ornaments are mainly various trinkets for personal decoration made of base metal, plastic, glass, resin and other materials. Due to the low price and exquisite design of imitation jewelry, with the change of people's aesthetic and consumption concepts, it has been favored by more and more urban beauties in recent years. However, due to its simple process, low market entry barriers, and lack of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/28
Inventor 卫碧文杨荣静望秀丽朱军王荣武徐平华
Owner ELECTROMECHANICAL PRODS DETECTING TECH CENT OF SHANGHAI ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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