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Method for detecting surface defects of speaker cone

A defect detection, loudspeaker technology, applied in the direction of optical testing defects/defects, etc.

Active Publication Date: 2015-02-18
HANGZHOU DIANZI UNIV
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  • Method for detecting surface defects of speaker cone
  • Method for detecting surface defects of speaker cone
  • Method for detecting surface defects of speaker cone

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[0038] Below in conjunction with accompanying drawing, the present invention will be further described, and the present invention comprises the following steps:

[0039] Step (1) collects the surface image of the speaker cone, and segments the annular region to be detected;

[0040] The collected paper cone image F (size M×N), such as Figure 1a As shown, due to the specific requirements of the follow-up process, only the annular area of ​​the paper cone needs to be tested (such as Figure 1b shown), so it is necessary to segment the collected original image to obtain the area of ​​the circular paper cone to be detected:

[0041] (a) Perform threshold η on the collected paper cone image according to the formula 1 Segment to get the foreground cone area:

[0042] F ( i , j ) = 0 , ifF ...

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Abstract

The invention relates to a method for detecting surface defects of a speaker cone. The method comprises the following steps: acquiring a surface image of the speaker cone, and segmenting a to-be-detected annular area; performing gradient detection on the to-be-detected annular area; and finally, performing consistency detection on the to-be-detected area. By utilizing the non-contact digital image detection technology, the defect detection efficiency of the speaker cone is improved, the method can be used for automatically detecting the surface appearance defects of the speaker cone, the product quality can be further improved, the production cost is reduced, and the method has important practical engineering significances.

Description

technical field [0001] The invention belongs to the field of machine vision, and in particular relates to a surface defect detection method of a loudspeaker paper cone. Background technique [0002] In the speaker, the voice coil will vibrate strongly in the magnetic field after the audio signal is connected. The voice coil is fixed on the paper cone, and the vibration of the voice coil drives the vibration of the paper cone at the same time. sound. In the process of manufacturing paper cones, surface defects such as cone pulp marks, cone pulp blocks, cone sawdust, and cone white spots will appear on the surface of the paper cone due to the process, which will affect the appearance and use effect of the paper cone. In the actual industrial production process, due to the limitation of technical conditions, the surface defect detection of the paper cone still remains at the level of manual visual inspection, the labor intensity of the workers is high, and the production effic...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/95
Inventor 杨宇翔高明煜何志伟吴占雄黄继业曾毓
Owner HANGZHOU DIANZI UNIV
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