Bamboo strip defect on-line detection method based on machine vision

A technology of machine vision and detection method, which is applied in the field of visual detection, can solve problems such as the inability to automatically detect bamboo strips, and achieve the effect of solving misjudgment and missed detection

Inactive Publication Date: 2008-12-10
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiency that the existing technology cannot automatically detect the defects of bamboo strips, the present invention provides an onlin

Method used

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  • Bamboo strip defect on-line detection method based on machine vision
  • Bamboo strip defect on-line detection method based on machine vision
  • Bamboo strip defect on-line detection method based on machine vision

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Embodiment Construction

[0036] The width of the bamboo strips detected by the present invention is 14mm-25mm, the thickness is 6mm-10mm, and the length is 0.9m-2.6m. The bamboo strips are narrow and long workpieces. The light source is used to irradiate the four surfaces of the bamboo strips along the length direction vertically. In the acquired bamboo strip images, the triangular strip defect is manifested as the two border lines of the bamboo strips have a large angle; Compared with the normal area on the surface of the bamboo strip, the green area of ​​the bamboo has a darker brightness, a smaller gray value, and a larger area; the parallelogram defect area and the oblique cut defect area appear in the image as the shadow area on the side of the bamboo strip. Compared with the normal area on the surface of bamboo strips, the brightness is darker, the gray value is smaller, and the area is larger; for smaller moth-eaten holes, cracks and cracks, it is a slender feature with a smaller defect area, but t...

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Abstract

The invention discloses a bamboo strip defect online detection method based on machine vision. A camera is used for photographing the four surfaces of a bamboo strip continuously along the length direction of the bamboo strip to obtain the gray images of the surfaces of the bamboo strip. The image treatment is implemented on every captured frame of digital images and whether defects exist on the small section of the bamboo strip in the frame of the images is judged according to the bamboo strip defect detection method. If the small section of the bamboo strip in the frame of the images is provided with detects, the whole bamboo strip is considered to be provided with detects and simultaneously an instruction of the existing defects is sent to a sorting mechanism. If small sections of the bamboo strip in all frames of the images of the whole bamboo strip are provided with no detects, the bamboo strip is considered to be provided no detects. Simultaneously, an instruction with no detects is sent to the sorting mechanism. The method can implement the online detection on the defects of bamboos with different color shades and simultaneously detect the four surfaces along the length direction of the bamboo strip.

Description

Technical field [0001] The invention belongs to the field of visual inspection, in particular to a non-contact inspection method for bamboo strip defects. Background technique [0002] There are 39 genera and more than 500 kinds of bamboo in my country, with a distribution area of ​​more than 5 million hectares. Bamboo resources are rich and strong in regeneration ability, so it is more and more widely used. Generally, after 5-10 years of afforestation, bamboo can be cut and used every year. However, due to geographical environment, climate, humidity and other reasons, some bamboos will rot from the roots during the growth process, and they will grow insects; if they are not stored properly after being cut down, they will become moldy and cracks; and they will be cracked during bamboo processing. Defects such as oblique cutting and over-cutting occur, so defects such as rot, cavities, mold, cracks, and oblique cutting will appear on the bamboo strips. The bamboo product productio...

Claims

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Application Information

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IPC IPC(8): G01N21/88
Inventor 秦现生贺峰刘琼蔡勇宋昕宫养飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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