guglshirts.blogg.se - Fisheye paint defect

#FISHEYE PAINT DEFECT FULL#
#FISHEYE PAINT DEFECT SERIES#

This approach is independent of surface characteristics or shape and also works well in dirty environments. The measurement accuracy is in the order of nanometers and is considered as a gold standard for surface finish measurement. Contact-based profilometry, such as stylus profilometer, scanning tunnelling microscopy, scanning force microscopy, coordinate measuring machine (CMM), etc., is a high-resolution method. Profilometry approaches can be generally divided into contact and non-contact methods. Profilometry is a widely used approach for characterization, reconstruction and inspection of such surfaces. However, defect detection and surface profiling of a specular surface remains a challenging problem due to the reflective nature of the surface. In recent years, vision-based surface inspection systems have found a burst of application in areas such as defect detection in aluminium sheets, locomotive rail tracks, liquid crystal displays (LCDs), plastic objects, sphere parts, agricultural food produce, fabric and textile industry etc.

Each type of defect varies in shape and size, and experienced inspectors even miss some defects.

Designing a proper lighting environment for such a system is a challenging task due to high reflection coefficient of the test surface.

The visibility characteristic of the defect depends on the external lighting conditions.

The part being inspected vary in curvature, size, shape and material, with different specular characteristics.

The inspection process must fit within the existing production cycle time.

The vibrations induced from this motion makes profiling the surface harder.

Parts are in motion while they are inspected on the production line.

#FISHEYE PAINT DEFECT SERIES#

There are a series of challenges that impact the development of an inspection system for this task, including: This extended version includes expended testing and analysis. This paper presents a system for inspecting automotive painted semi-specular exterior body parts and is an extension of work originally presented in 15th Conference on Computer and Robot Vision (CRV 2018). As a result, overall productivity and quality are diminished. Further, the defect judgement is very subjective, which results in inconsistencies. It is a costly and a labour intensive job which requires multiple inspection lines for high volume yield. This inspection process is usually carried out by human inspectors.

#FISHEYE PAINT DEFECT FULL#

As such, it is essential to perform a full inspection of every part. Defects may induce during any of these processes, which results in part rejection or rework, causing loss of revenue. This process consists of three main steps: moulding, cleaning, and painting. These outer body parts are made by Thermoplastic PolyOlefin (TPO) injection moulding process. Example of these parts includes front and back bumper covers, side fenders, and other exterior parts which are normally manufactured and painted to specific colour before being shipped to another plant for assembly. In the automotive industry, vehicles are usually assembled from parts shipped by various original equipment manufacturers (OEM) to the assembly plant. Quality control is a crucial factor in manufacturing industry as it affects customer satisfaction, reduces production cost and increases profitability.