Josep Pladellorens

• Polytechnic University of Catalonia

We presented a method of measure of the rugosity based in the analysis of the texture of the speckle's pattern. We used GLCM to extract the rugosity. Our experimental results correlates appropriately with autocorrelation function.

Roughness of a paper surface is particularly important in paper and board destined to be printed. Surfaces are often coated and the amount of coating and method of application used depends on the roughness of the base paper. We present a method to measure the roughness of paper based on the analysis of speckle contrast pattern on the surface. Image...

57 Resumen: Sistema y procedimiento para la medida de la rugosidad de una muestra de papel mediante el análisis del patrón de textura del speckle. Sistema para la medida de la rugosidad de una muestra (2) de papel, que con un láser (1) y un expansor del haz (11) en ángulo y distancia determinada respecto a la muestra (3), una cámara (3) digital en...

A means of facilitating the transfer of Optical inspection methods knowledge and skills from academic institutions and their research partners into Panama optics and optical research groups is described. The process involves the creation of an Integrated Knowledge Group Research (IKGR), a partnership led by Polytechnic University of Panama with the...

We present a new method of measure of the roughness based on the analysis of the texture of speckle pattern on the surface. Images of speckle pattern over the surface are captured by means of a simple configuration using a laser, beam expander, and a camera charge coupled device (CCD). Using the properties of the normalized covariance function that...

We present a new method of measure of the roughness based on the analysis of the texture of speckle pattern on the surface. Images of speckle pattern over the surface are captured by means of a simple configuration using a laser, beam expander, and a camera charge coupled device (CCD). Using the properties of the normalized covariance function that...

We present a method of measure of the roughness of the paper based on the analysis of a speckle pattern on the surface. Images of speckle over the surface of paper are captured by means of a simple configuration using a laser, beam expander, and a camera charge-coupled device (CCD). Then we use the normalized covariance function of the fields, leav...

Paper surface roughness is an important consideration in paper and board destined for printing. The amount of coating and method of application depend on the roughness of the base paper. We present a method to measure the roughness of the paper based on analysis of speckle pattern on the surface. Images are captured by means of a simple configurati...

Roughness of paper surface is an important parameter in paper manufacturing. Surface roughness measurement is one of the central measurement problems in paper industry. Surfaces are often coated and the amount of coating and method of application used depends on the roughness of the base paper [1], [2]. At the moment, air leak methods are standardi...

We present a method of measure of the roughness of the paper based in the analysis of speckle pattern on the surface. Images are captured by means of a simple configuration using a laser, beam expander and a camera CCD. Then, we apply digital image processing using the gray level co-occurrence matrix (GLCM) that has a descriptor that may be related...

Roughness of a paper surface is particularly important in paper and board destined to be printed. Surfaces are often coated and the amount of coating and method of application used depends on the roughness of the base paper. We present a method of measure of the roughness of the paper based in the analysis of speckle pattern on the surface. Images...

In this work, we present a new and fast easy-to-use device that allows the measurement of color and the detection of spots on the human skin. The developed device is highly practical for relatively untrained operators and uses inexpensive consumer equipment, such as a CCD color camera, a light source composed of LEDs and a laptop. The knowledge of...

Projecte presentat al 1r Premi a la Qualitat de la Gestió Universitària, convocat pel Consell Social de la UPC

A device has been designed for off-line optical paper inspection and quality control of stripes and holes in the cigarette paper. Hardware description is first presented including main paper characteristics to be measured. Typical paper stripe and holes structures are then discussed with image processing and analysis considerations to discriminate...

A device has been designed based on the diffraction that will permit to analyze in an objective and quick form, the quality of ophthalmic lenses. This device situated in the line of production will improve the process of fabrication. The device is based on the phenomenon of the diffraction that takes place in the defects when impacting the light of...

The traditional paper surface characterisation methods, for example based on air-stream leakage (Bendtsen, Parker print surf), are facing severe limitations. These traditional methods are better suited as indicators of erroneous production than for grading paper samples with respect to his print quality potential. It has been acknowledged that this...

Formation is the measure of variations due to non-uniform fibre distribution in a sheet of paper. Paper formation is one of the most important properties of paper and is still difficult to measure. A method for determining this property has been developed. This method, based on light transmission image analysis, uses features of the power spectrum...

The paper formation is one of the most important properties of the paper but remains a difficult property to determine. A method for determining this property has been developed. This method based on light transmission image analysis uses the power spectra of the Fourier transform to analyze the floc distribution. The method has been tested for var...

Paper formation is an important quality parameter, but it has been difficult to measure satisfactorily. A fast, convenient, quantitative measurement is important for automatic inspection of sheet formation. A new index of formation was developed using an image analysis method based on wavelet theory. It provides a multi-resolution analysis that is...

A method of image analysis is proposed for detection of local defects in materials with periodic regular texture. A general improvement and enlargement of vision system capabilities for versatility, full automa-tism, computational efficiency, and robustness in their application to the industrial inspection of periodic textured materials is pursued....

The quality of gammagraphic images is improved by using a Wiener filter. In the case of left ventricular images, we show that the use of a Wiener filter as a preprocessing of the image improves the calculation of left ventricular volumes. By using a computer generated left ventricle and images of a phantom we verify that the calculated volume is cl...

The aim of this study is to investigate the use of mathematical morphology for the determination of left ventricular contours in scintigraphic images using multigated radionuclide angiography. We have developed a completely automatic method that first restores the image with a Wiener filter, then finds the region where the left ventricle is contain...

The usefulness of unidimensional functions calculated from the power spectrum to determine the relative orientation between two analogous images is discussed. The results of the calculation obtained by the correlation of these unidimensional functions are compared with those obtained by two-dimensional angular correlation in order to test the preci...