September 2, 2020


Quality control is an extremely crucial element of any production process. Compromises in quality control can cause expensive disruptions in manufacturing processes, and unnecessary losses.

Surface Defect Detection (SDD) is an essential function of quality control. The primary purpose of SDD is to prevent products containing surface defects such as cracks, smudges, broken points from reaching the customers. Results of SDD have an impact on design, manufacturing, process planning, and logistics. Until recently, SDD was conducted manually. Manual Defect detection has many disadvantages, namely:

  • Subjectivity
  • Variable standards
  • High costs in terms of man-hours
  • Subtle defects are undetectable.

The disadvantages prompted the need for the development of automated systems. Automated Surface Defect Detection systems using intelligent image processing overcome these disadvantages, allowing manufacturers to improve quality and customer satisfaction exponentially. Automated systems are not affected by fatigue, stress, and can carry out defect detection in an unbiased and objective manner.

How does SDD work?

Surface Defect Detection (SDD) ensures surface quality. Surface quality is vital for any OEM, as it can affect the appearance and functioning of a product. SDD is regularly used to detect defects on various surfaces such as biomedical systems, LCD screens, glass, ceramics, tile, metal/steel, and curved surfaces. Any dent, scratch, minute hole, the colour difference is considered as a defect. SDD uses the latest technology in machine vision techniques such as image processing, pattern recognition, artificial intelligence, and adaptive machine learning

According to an article by, the steps involved in SDD differ as per the tested surface. But on a macro level, the process looks as follows:

How can SDD help in Grading?

Let us understand what is grading. Grading is the process of dividing finished or unfinished products based on some pre-defined or market defined criteria. These criteria are based on shape and size, type, weight etc.

Grading delivers many advantages, namely:

  • Cost reduction: Adhering to set grading standards helps in producing identical goods or services.
  • Production Efficiency: Grades set an objective of sorts. A production line can be 'tuned up' for achieving a particular grade, thereby improving overall efficiency.
  • Better earnings: Higher the grade of product, better the profits – a universal fact. An OEM can implement an ambitious pricing policy when the cosmetic and other qualities of a product are independently certified.
  • Customer Satisfaction: Good grade means good quality. When products with good grades are manufactured and delivered consistently, there is an evident positive impact on customer satisfaction and confidence.
Good Quality- is the Keyword

Good quality product means Grade A product – a comparison which has become a mainstay in the consumers’ mind. Many industries as given below rely on Cosmetic Grading for business success.

  • Electronics
  • Refurbished products
  • Jewelry
  • Medical Equipment
  • Automobile parts
  • Aerospace and many more

It should be noted, the industries specified above rely heavily on perfection. A minuscule scratch or minute dent can result in loss of business, and worse still loss of reputation and hard-earned customer base. An unaffordable proposition!

SDD provides quantifiable data for setting up of grades. The grades can be further utilized to create baselines for production and quality purposes.

Imaging Technology in Grading

At Griffyn Robotech, we believe in the potential of high-end image processing backed by intelligent, self-learning machines. Our product DEEPSIGHT® is a vision inspection machine that can automatically detect, identify, analyze & grade cosmetic defects on the product surface, accurately and fast. DEEPSIGHTS’s key features are:

  • Fast and Accurate detection
  • Measurement and analysis of defects
  • Adaptive Deep Learning algorithms
  • Image Processing Based analysis
  • Scalable solution to suit product size & defect specifications

Griffyn Robotech focuses on developing intelligent machines for industries and organizations that do not wish to compromise on quality.

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