Analysis of Block Matching Algorithms for the application of image mosaicing to online surface inspection of steel products

Rodríguez-Jiménez, Silvia; Álvarez, Ignacio; Garcia, R.; Marina, Jorge

doi:10.1109/ist.2010.5548491

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…Since the prototype is designed on a line of light projection technique, a vector of a line-profile is obtained in a single step which makes a rapid acquisition of the entire line. A robust prototype assembly with a fast algorithm was built as these are among the criteria for online production devices (Rodríguez-Jiménez et al 2010). …”

Section: Ontop Prototypementioning

confidence: 99%

“…There are a few online devices available which are designed to detect mainly a surface fault as this is also important (Rodríguez-Jiménez et al 2010). There are also some devices which measure surface roughness within a short range of wavelengths and thus there was a requirement for an online device that can comprehensively measure and analyze the surface topography within a wide range of wavelength.…”

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confidence: 99%

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Online surface roughness characterization of paper and paperboard using a line of light triangulation technique

Alam¹,

Manuilskiy

Thim

et al. 2012

Nordic Pulp &Amp; Paper Research Journal

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SUMMARY:Within both the paper and paperboard industries, real time monitoring and measurement of surface roughness of a paper moving at high velocities is an important and challenging area of research. The uniform surface, for an entire production, can be effectively achieved by monitoring and controlling the paper surface roughness, in real time during the manufacturing steps. Presently the majority of paper industries rely on traditional laboratory profilometers. The obvious limitations of lab profilometers are that these are slow, do not measure the quality of entire reels but rather deal with only a few small pieces of samples taken from the end of the reels and it is difficult to make any possible correction in the production lines without knowing the online roughness data. To eradicate the disadvantages associated with conventional measurements, an online prototype instrument has been developed that measures the surface roughness during the manufacturing steps, and is based on a line of light triangulation technique. The prototype technique will be of assistance in ensuring tight process control in order to maintain both a better and a uniform quality throughout the entire production. It measures the whole reel, meter by meter, in traditional units of roughness and is also capable of characterizing the topography in a wide range of wavelength spectra. The article presents the online analyses results obtained from the developed prototype. The real time measurements, in a paperboard pilot mill, have successfully characterized and distinguished 16 different grades of newspaper and paperboard reels including reels which have the same family of quality grades and materials.

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Section: Ontop Prototypementioning

confidence: 99%

mentioning

confidence: 99%

Online surface roughness characterization of paper and paperboard using a line of light triangulation technique

Alam¹,

Manuilskiy

Thim

et al. 2012

Nordic Pulp &Amp; Paper Research Journal

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“…Recently, a small number of online devices have been developed but, with limited features, the majority of these are only designed to detect surface defects [15]. Scientists and researchers are endeavoring to develop new online techniques and are designing new sensors [16], [17] based on the non-contact principle, for example, light scattering, diffractions, interferometric, confocal microscopy, and laser triangulation [5], [12], [18], [19].…”

Section: Introductionmentioning

confidence: 99%

Real Time Surface Measurement Technique in a Wide Range of Wavelengths Spectrum

et al. 2014

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Real time surface topography measurement in the paper and paperboard industries is a challenging research field. The existing online techniques measure only a small area of paper surface and estimate topographical irregularities in a narrow scale as a single predictor. Considering the limitations and complications in measuring the surface at high speed, a laser line triangulation technique is explored to measure surface topography in a wide scale. The developed technique is new for the paper and paperboard application that scans a line onto the paper-web surface up to 210 mm in length in the cross machine direction. The combination of a narrow laser linewidth imaging, a subpixel resolution, and the selection of a unique measurement location has made it possible to measure roughness and simultaneously characterize paper surface topography from 0.1 to 30 mm spatial wavelength. This spatial range covers wide scale surface properties such as roughness, cockling, and waviness. The technique clearly distinguishes and characterizes the surface of newspaper, and lightweight coated, coated, and uncoated paperboard in real time during the paper manufacturing process. The system temporal noise for the average roughness is estimated as 37 dB. The signal to noise ratio found is from 5.4 to 8.1 in the short spatial wavelength up to 1 mm, whereas it is more than 75 in the long spatial wavelength from 5 to 10 mm.Index Terms-Optical online surface topography, narrow laser linewidth imaging, laser line triangulation, surface measurements techniques, paper and paperboard topography.

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