Topography and reflectance analysis of paper surfaces using a photometric stereo method

Hansson, Peter; Johansson, Per-Åke

doi:10.1117/1.1287261

Cited by 25 publications

(15 citation statements)

References 8 publications

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“…Hansson and Johansson presented a two-light PS method in (Hansson and Johansson, 2000). The imaging was modeled as…”

Section: Reconstruction Methodsmentioning

confidence: 99%

“…In the second experiment, paper surfaces were reconstructed from gradient fields calculated using photometric stereo. The OTF and SNR functions for Hansson, and Symmetric methods were as Hansson proposed in (Hansson and Johansson, 2000). The paper surface images for photometric stereo were acquired using a CCD camera with a resolution of 2048 x 2048 pixels with 12 bits per pixel.…”

Section: Application Examplementioning

confidence: 99%

“…They evaluated several surface description models, but did not reconstruct surfaces with or without noise. Recently Hansson (Hansson and Johansson, 2000) has studied two-light photometric stereo in paper surface reconstruction. Based on Hansson's work, Kuparinen extended the Hansson's two light method to four-light photometric stereo using Symmetrical binary weights in (Kuparinen et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Measurement Noise in Photometric Stereo Based Surface Reconstruction

Kuparinen

Kyrki

Toivanen

2008

Proceedings of the Third International Conference on Computer Vision Theory and Applications

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In this paper, we present a noise reduction method for photometric stereo based surface reconstruction of surfaces with high frequency height variation. Such surfaces are important for many industrial settings, for example, in paper and textile manufacturing. The paper presents the derivation of the effect of white image noise to gradient fields. Based on the derivation, a denoising approach of the gradient fields using the Wiener filter is proposed. Several known surface reconstruction methods with and without the proposed denoising approach are evaluated experimentally, with respect to the effect of the noise, and the boundary conditions of the reconstruction. The experimental results validate that the proposed approach improves the surface reconstruction on surfaces with high frequency height variation.

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“…Hansson and Johansson presented a two-light PS method in (Hansson and Johansson, 2000). The imaging was modeled as…”

Section: Reconstruction Methodsmentioning

confidence: 99%

Section: Application Examplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Measurement Noise in Photometric Stereo Based Surface Reconstruction

Kuparinen

Kyrki

Toivanen

2008

Proceedings of the Third International Conference on Computer Vision Theory and Applications

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“…The selected areas have been imaged with a camerabased device that applies the photometric stereo principles described in [16]. It is based on photographic imaging with slanting illumination, and it provides both reflectance and surface topography maps of the paper sample.…”

Section: Data Acquisitionmentioning

confidence: 99%

Relating halftone dot quality to paper surface topography

Kumpulainen

Mettänen

Lauri

et al. 2010

Neural Comput & Applic

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Most printed material is produced by printing halftone dot patterns. One of the key issues that determine the attainable print quality is the structure of the paper surface, but the relation is non-deterministic in nature. We examine the halftone print quality and study the statistical dependence between the defects in printed dots and the topography measurement of the unprinted paper. The work concerns SC paper samples printed by an IGT gravure test printer. We have small-scale 2D measurements of the unprinted paper surface topography and the reflectance of the print result. The measurements before and after printing are aligned with subpixel resolution, and individual printed dots are detected. First, the quality of the printed dots is studied using Self Organizing Map and clustering and the properties of the corresponding areas in the unprinted topography are examined. The printed dots are divided into high and low print quality. Features from the unprinted paper surface topography are then used to classify the corresponding paper areas using Support Vector Machine classification. The results show that the topography of the paper can explain some of the print defects. However, there are many other factors that affect the print quality, and the topography alone is not adequate to predict the print quality.

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“…Photometric stereo has also been applied to the analysis 2 EURASIP Journal on Advances in Signal Processing and description of surface structures in [11][12][13][14]. It has also been applied to the problems of machine inspections [15] and identification of machined surfaces [16]. In [17], graph cuts minimization technique has been used for estimation of the surface normals using photometric stereo.…”

Section: Introductionmentioning

confidence: 99%

A Practical Approach for Simultaneous Estimation of Light Source Position, Scene Structure, and Blind Restoration Using Photometric Observations

Sharma

Joshi

2008

EURASIP J. Adv. Signal Process.

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Given blurred observations of a stationary scene captured using a static camera but with different and unknown light source positions, we estimate the light source positions and scene structure (surface gradients) and perform blind image restoration. The images are restored using the estimated light source positions, surface gradients, and albedo. The surface of the object is assumed to be Lambertian. We first propose a simple approach to obtain a rough estimate of the light source position from a single image using the shading information which does not use any calibration or initialization. We model the prior information for the scene structure as a separate Markov random field (MRF) with discontinuity preservation, and the blur function is modeled as Gaussian. A proper regularization approach is then used to estimate the light source position, scene structure, and blur parameter. The optimization is carried out using the graph cuts approach. The advantage of the proposed approach is that its time complexity is much less as compared to other approaches that use global optimization techniques such as simulated annealing. Reducing the time complexity is crucial in many of the practical vision problems. Results of experimentation on both synthetic and real images are presented.

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Topography and reflectance analysis of paper surfaces using a photometric stereo method

Cited by 25 publications

References 8 publications

Measurement Noise in Photometric Stereo Based Surface Reconstruction

Measurement Noise in Photometric Stereo Based Surface Reconstruction

Relating halftone dot quality to paper surface topography

A Practical Approach for Simultaneous Estimation of Light Source Position, Scene Structure, and Blind Restoration Using Photometric Observations

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