Image Processing and Concentric Ellipse Fitting to Estimate the Ellipticity of Steel Coils

نویسندگان

  • Daniel C. H. Schleicher
  • Bernhard G. Zagar
  • Yung-Sheng Chen
چکیده

In this chapter a particular image processing problem existing in quality assurance for steel industry is addressed. Since the quality standards in steel industry are ever increasing, even steel industry starts to use machine vision systems to monitor their product quality. In case of steel coils a particular figure of merit in quality is the roundness (ellipticity) or lack thereof of the coil. The mathematical correct measure of the roundness is the eccentricity , with the major semi axis a and the minor semi axis b. But the fastest way for the

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

The 3D position recognition of multiple coils using ellipse fitting with probabilistic edge detection with stereo cameras

The development of unmanned crane is an important issue of Factory Automation in steel industry. This paper focus on unmanned crane for picking up coils on a trailer although positions and diameters of coils is not fixed. In order to pick up those coils, unmanned crane should know exact 3D coil position. Therefore, in order to find out exact 3D coil’s centers, this paper propose the system that...

متن کامل

Direct Ellipse Fitting and Measuring Based on Shape Boundaries

Measuring ellipticity is an important area of computer vision systems. Most existing ellipticity measures are area based and cannot be easily applied to point sets such as extracted edges from real world images. We are interested in ellipse fitting and ellipticity measures which rely exclusively on shape boundary points which are practical in computer vision. They should also be calculated very...

متن کامل

Ellipse Fitting Using Orthogonal Hyperbolae and Stirling's Oval

Two methods for approximating the normal distance to an ellipse using a) its orthogonal hyperbolae, and b) Stirling’s oval are described. Analysis with a set of quantitative set of measures shows that the former provides an accurate approximation with little irregularities or biases. Its suitability is evaluated by comparing several approximations as error of fit functions and applying them to ...

متن کامل

Non-uniformity of Clinical Head, Head and Neck, and Body Coils in Magnetic Resonance Imaging (MRI)

Introduction Signal intensity uniformity in a magnetic resonance (MR) image indicates how well the MR imaging (MRI) system represents an object. One of the major sources of image non-uniformity in high-field MRI scanners is inhomogeneity of radio-frequency coil. The aim of this study was to investigate non-uniformity in head, head and neck, and body coils and compare the obtained results to det...

متن کامل

Impedance Measurements using Analog to Digital Converters and Ellipse Fitting Signal Processing Algorithms

In this paper, the measurement of impedances using analog to digital converters and ellipse fitting signal processing algorithms is described. The robustness of this new method makes it specially suited for low frequency impedance measurements (up to 1 MHz) in portable DSP based instruments. Previous methods relied on sine-fitting algorithms to estimate the sine parameters together with the sig...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2012