Metrological Evaluation of the Demosaicking Effect on Colour Digital Image Correlation with Application in Monitoring of Paintings

Παπανικολάου, Αθανασία; Garbat, Piotr; Kujawińska, Małgorzata

doi:10.3390/s22197359

Cited by 3 publications

(3 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To achieve this, multiple imaging modalities have been selected to be combined into a relatively low-cost device that can be used in situ. The modalities selected for the multimodal system described in this work are SL, 3D colour DIC (cDIC) [16] and multispectral imaging. Using the selected modalities, we can monitor in situ and in a non-destructive way the:…”

Section: Motivationmentioning

confidence: 99%

“…3D DIC is a method essentially tracking the position of unique intensity pattern across subsequent images, though correlation criteria, for the calculation of displacements and strains. To optimize the result for natural texture objects, we followed the approach described in [16] by generating merged displacement and strain maps from the individual colour channels based on the optimum correlation for each pixel. The structured light method is achieved by capturing images of the object under varying illumination patterns projected onto the object.…”

Section: Experimental Apparatusmentioning

confidence: 99%

See 1 more Smart Citation

Multimodal Measurement of Parchment Using a Custom 3D Scanner

Papanikolaou,

George,

Sole

et al. 2023

archiving

View full text Add to dashboard Cite

A multimodal optomechatronics system is presented for measuring and monitoring change in cultural heritage objects exposed to environmental condition fluctuations or conservation treatments. It combines structured light, 3D colour digital image correlation and multispectral imaging, delivering information about an object's 3D shape, displacements, strains and reflectivity. The high functionality and applicability of the system are presented with the example of historical parchment subjected to changes in relative humidity.

show abstract

Section: Motivationmentioning

confidence: 99%

Section: Experimental Apparatusmentioning

confidence: 99%

Multimodal Measurement of Parchment Using a Custom 3D Scanner

Papanikolaou,

George,

Sole

et al. 2023

archiving

View full text Add to dashboard Cite

show abstract

“…Due to the popularity of color cameras, the method of measuring deformation and shape based on color speckle images has received enough attention and has even been applied to high-temperature deformation [ 7 ], the topography of a liquid interface [ 8 ], and monitoring of painting [ 9 ]. In fact, researchers are interested in the rich information contained in the color image.…”

Section: Introductionmentioning

confidence: 99%

Digital Image Correlation with a Prism Camera and Its Application in Complex Deformation Measurement

Qian

Yong-qing

et al. 2023

Sensors

View full text Add to dashboard Cite

Given the low accuracy of the traditional digital image correlation (DIC) method in complex deformation measurement, a color DIC method is proposed using a prism camera. Compared to the Bayer camera, the Prism camera can capture color images with three channels of real information. In this paper, a prism camera is used to collect color images. Relying on the rich information of three channels, the classic gray image matching algorithm is improved based on the color speckle image. Considering the change of light intensity of three channels before and after deformation, the matching algorithm merging subsets on three channels of a color image is deduced, including integer-pixel matching, sub-pixel matching, and initial value estimation of light intensity. The advantage of this method in measuring nonlinear deformation is verified by numerical simulation. Finally, it is applied to the cylinder compression experiment. This method can also be combined with stereo vision to measure complex shapes by projecting color speckle patterns.

show abstract

The Effect of Varying the Light Spectrum of a Scene on the Localisation of Photogrammetric Features

Burdziakowski

2024

Remote Sensing

View full text Add to dashboard Cite

In modern digital photogrammetry, an image is usually registered via a digital matrix with an array of colour filters. From the registration of the image until feature points are detected on the image, the image is subjected to a series of calculations, i.e., demosaicing and conversion to greyscale, among others. These algorithms respond differently to the varying light spectrum of the scene, which consequently results in the feature location changing. In this study, the effect of scene illumination on the localisation of a feature in an image is presented. The demosaicing and greyscale conversion algorithms that produce the largest and smallest deviation of the feature from the reference point were assessed. Twelve different illumination settings from polychromatic light to monochromatic light were developed and performed, and five different demosaicing algorithms and five different methods of converting a colour image to greyscale were analysed. A total of 300 different cases were examined. As the study shows, the lowest deviation in the polychromatic light domain was achieved for light with a colour temperature of 5600 K and 5000 K, while in the monochromatic light domain, it was achieved for light with a green colour. Demosaicing methods have a significant effect on the localisation of a feature, and so the smallest feature deviation was achieved for smooth hue-type demosaicing, while for greyscale conversion, it was achieved for the mean type. Demosaicing and greyscale conversion methods for monochrome light had no effect. The article discusses the problem and concludes with recommendations and suggestions in the area of illuminating the scene with artificial light and the application of the algorithms, in order to achieve the highest accuracy using photogrammetric methods.

show abstract

Metrological Evaluation of the Demosaicking Effect on Colour Digital Image Correlation with Application in Monitoring of Paintings

Cited by 3 publications

References 26 publications

Multimodal Measurement of Parchment Using a Custom 3D Scanner

Multimodal Measurement of Parchment Using a Custom 3D Scanner

Digital Image Correlation with a Prism Camera and Its Application in Complex Deformation Measurement

The Effect of Varying the Light Spectrum of a Scene on the Localisation of Photogrammetric Features

Contact Info

Product

Resources

About