Jaime Meneses

• PhD
• Industrial University of Santander

En este artículo se presenta una estrategia que permite determinar de forma simultánea la posición y orientación de un objeto en el plano. El método consiste en analizar un sistema de franjas radiales adherido al objeto y por medio de procesamiento digital de imágenes determinar su fase. Este proceso requiere determinar con precisión subpixel las c...

The conventional reading of the skin prick test (SPT) for diagnosing allergies is prone to inter- and intra-observer variations. Drawing the contours of the skin wheals from the SPT and scanning them for computer processing is cumbersome. However, 3D scanning technology promises the best results in terms of accuracy, fast acquisition, and processin...

In fringe projection profilometry, the lens distortion of a commercial projector may introduce larger error when testing large objects and can become one of the major error sources. In this paper, a calibration method for a fringe projection system is adapted in order to remove the influence of projector lens distortion without the need to calibrat...

The main problem in the double-frequency algorithms is the sensitivity to noise, it is amplified when the ratio between the high frequency and the low one is large. Different proposals have been published with the intention of reducing the impact of noise. One of the most effective is the Hyun and Zhang’s algorithm which include geometric constrain...

The phase retrieval process is mainly affected by local shadows, irregular surface brightness and fringe discontinuities. To overcome these problems, image-processing strategies are carried out such as binary masks, interpolation techniques, and filtering. Similarly, many unwrapping algorithms have been developed to handle phase unwrapping errors i...

The calibration methods most used in fringe projection profilometry are based on models of least squares adjustment and stereo vision techniques. However, the geometric distortions of the projector and camera lenses introduce imprecision in certain regions of the 3D reconstruction. In this paper, we perform a comparative study between the second or...

Promovido por la actual Sociedad Red Colombiana de Óptica, el Encuentro Nacional de Óptica (ENO) ha sido una actividad periódica desde su primera versión realizada en el año 1987 en la ciudad de Medellín. En el año 2006, la Red Colombiana de Óptica amplió la cobertura de promoción, fomento y fortalecimiento de la óptica y sus aplicaciones al invita...

We study the influence of geometric distortions of the camera and projector lenses on 3D reconstruction quality for fringe projection profilometry. Experimental results on real objects and their 3D models show the accuracy is improved.

This works presents a new CASSI setup to capture the depth and spectral information of a scene using structured light and compressive sensing. The traditional sensor in structured light acquisition is replaced by a CASSI camera.

This paper presents a three-dimensional reconstruction strategy (3DR) specialized in the digital reconstruction of Human Skulls. The strategy is based on the fringe projection technique, which has important advantages over other 3DR techniques such as versatility, flexibility, resolution and precision. The equipment required is a digital camera, a...

A deformed fringe pattern was placed in the projector in order to compensate geometric distortion of projector lens. A lineal phase-height relationship was obtained and results show a reduction of 35% of residual errors.

Corneal topography is a computerized diagnostic tool that creates a three-dimensional map of the surface of the cornea. Corneal topography provides tools needed to know the morphology, optics, power distribution and radii of the anterior surface of the cornea. This is of great help for multiple fields of optometry and ophthalmology: contact lens fi...

Un alto porcentaje de cirugías de Reconstrucción de Ligamento Cruzado Anterior son fallidas debido al mal posicionamiento de los túneles tibial y femoral. Para esto se diseñó un sistema, basado en la estructura Optitrack-Motive, que, usando Realidad Aumentada, apoya el proceso de perforación de los túneles realizando el seguimiento de marcadores pa...

A method to extract 3D information using a white light interferometer without using PZT is presented. Instead a positioning system that uses the phase sensitivity of a target periodic is employed. The image treatment realized on the periodic target permits to calculate the relative distance between Mirau objective and object surface. Topographic re...

The FPT provides 3D reconstructions with a large number of points. However, the algorithms presented here reduced the point cloud using analysing of curvatures of topography and further characterize the areas with particular curvatures.

Using a Microsoft Kinect sensor a 3D reconstruction of the human torso in real-time is obtained, further was performed an meteorological analysis where an estimate of the error in reconstruction has been achieved.

In order to get measures with a high accurate, three-dimensional reconstruction systems are implemented in industrial, medical, and investigative fields. To obtain high accurate is necessary to carry out an appropriate calibration procedure. In fringe projection profilometry, this procedure allows obtaining a relation between absolute phase and thr...

Three-dimensional shape measurement is a subject that consistently produces high scientific interest and provides information for medical, industrial and investigative applications, among others. In this paper, it is proposed to implement a three-dimensional (3D) reconstruction system for applications in superficial inspection of non-metallic pipes...

A three-dimensional topographic reconstruction system of the forge pattern surfaces through laser triangulation has been purposely designed and evaluated. With this work, the results of the topographic study of the forge pattern subjected to ion implantation and/or coated with Ti/TiN layer are being presented. Further, the system permits not only t...

Traditionally, ultrasonic ranging sensors emit pulse trains. The distance traveled by the received signal is calculated from its delay with respect to the emitted signal. There are different strategies to encode the signal in order to determine the delay. In this paper we present a method for encoding amplitude that encodes the amplitude of a signa...

Con el método de Zhang para la calibración de una cámara, se propone un método con el cual sea posible realizar la estimación de parámetros intrínse- cos de la cámara, basado en el cálculo de la fase de un patrón de puntos codificado. El método propuesto requiere un patrón pseudo periódico de puntos negros equiespaciados que matemáticamente se pued...

Although the cerebral networks involved in sensory perception are of general interest in neuroscience, registration of the effects of olfactory stimulation, especially in a magnetic resonance imaging (MRI) environment, presents particular problems and constraints. This article presents details of a reliable and portable system for olfactory stimula...

Inspired by Zhang's method on camera calibration, a phase based approach to the estimation of features points is proposed. The proposed method requires a pseudo periodic pattern of equispaced black dots that mathematically can be represented by two orthogonal fringe systems. Due to regular distribution, control point positions are obtained with sub...

This paper shows a strategy based on digital image processing to determine 3D displacement of an object in a calibrated space of a stereo vision system. An artificial target with alternating white and black fringes located on the periphery of a truncated cone defines a conical target, when attached to object surface allows determine its trajectory....

En este artículo se presenta una estrategia que permite determinar de forma simultánea la posición y orientación de un objeto en el plano. El método consiste en analizar un sistema de franjas radiales adherido al objeto y por medio de procesamiento digital de imágenes determinar su fase. Este proceso requiere determinar con precisión subpixel las c...

In the podiatry field, many of the foot dysfunctions are mainly generated due to: Congenital malformations, accidents or misuse of footwear. For the treatment or prevention of foot disorders, the podiatrist diagnoses prosthesis or specific adapted footwear, according to the real dimension of foot. Therefore, it is necessary to acquire 3D informatio...

The Confocal Laser Scanning Microscopy (CLSM) has been widely used in the semiconductor industry and biomedicine because of its depth discrimination capability. Subsequent to this technique has been developed in recent years Chromatic Confocal Microscopy. This method retains the same principle of confocal and offers the added advantage of removing...

In this paper we propose a hand-held 3D laser scanner composed of an optical head device to extract 3D local surface information and a stereo vision system with subvoxel precision to measure the position and orientation of the 3D optical head. The optical head is manually scanned over the surface object by the operator. The orientation and position...

A method used to digitally extend the depth of field of an imaging system consists to move the object of study along the optical axis of the system and different images will contain different areas that are sharp; those images are stored and processed digitally to obtain a fused image, in that image will be sharp all regions of the object. The impl...

We present a method for the visual measurement of the 3D position and orientation of a moving target. Three dimensional sensing is based on stereo vision while high resolution results from a pseudo-periodic pattern (PPP) fixed onto the target. The PPP is suited for optimizing image processing that is based on phase computations. We describe experim...

Se diseñó y construyó un dispositivo óptico para la reconstrucción tridimensional de objetos con simetría cilíndrica, utilizando la técnica de triangulación láser; con una aplicación directa en Balística Interior. En el método de triangulación láser una línea láser se proyecta sobre la superficie del objeto de estudio y a partir de la deformación d...

En este trabajo se implementa un método que permite medir con alta precisión, la posición, el desplazamiento y la orientación en el plano de un objeto móvil. Se fija una mira de referencia al objeto de estudio y se localiza en la escena por medio de un sistema de visión estático con resolución subpixel, en el plano perpendicular al eje óptico (in-p...

In this work, a miniaturized probe of chromatic confocal microscopy to measure the optical thickness and topography of tissues is presented. The experimental model is based on the principle of focus multiplexing by wavelength encoding due to a phase Fresnel lens. The device is composed of a point polychromatic illumination system, a wavelength–heig...

The chromatic confocal methods are attractive for various applications, such as imaging of biological samples and semiconductor materials. In this paper a chromatic confocal method to measure the topography, the refractive index and optical thickness of tissues is develop. The experimental model is based on the longitudinal chromatic aberration pro...

One way to extend depth of field of any optical system is to take several images with different focus positions and combine them into a single composite image, which contains all regions fully focused. The challenge then becomes to select from each image the pixels that are in focus. We describe a new focus measure based on the shapelet decompositi...

The confocal scanning technique is attractive in various microscopic imaging applications because of its capabilities for superior resolution, rejection of scattered light and depth discrimination. This method drew special interest in applications such as imaging biological samples and semiconductor materials, in which high definition in both trans...

En este trabajo se implemento un sistema de medida de la topografía de objetos en configuración axial. Este se compone de dos lentes, y brazos de sensado con funcionamiento confocal. El objeto es colocado muy cerca del plano focal de la primera lente, a la salida de la segunda lente el haz es dividido en dos caminos. Un fotodetector es colocado ant...

En este trabajo se evalúa la Longitudinal Point Spread Function (LPSF) de microscopio confocal cromático, el cual funciona bajo un multiplexado focal generado por una lente difractiva de fresnel. El sistema utiliza como fuente de iluminación supercontínuos generados mediante efectos no lineales en fibra óptica monomodo estándar. El análisis espectr...

El reconocimiento de rostros usando correlación tridimensional (3D) discreta, es una técnica de gran alcance en tareas biométricas del reconocimiento. En este trabajo un procedimiento que usa la información de la gama que captura un sistema de la reconstrucción 3D se propone. La superfi-cie de la cara es 3D-scanned y dispuesto en un correlativo ars...

We present a robust algorithm of phase unwrapping that was designed for use on phase images with high noise content. We proceed with the algorithm by first identifying regions with continuous phase values placed between fringe boundaries in an image and then phase shifting the regions with respect to one another by multiples of 2π to unwrap the pha...

An analysis of the axial resolution of a chromatic dispersion confocal microscopy is presented. The system is based on the principle of focus multiplexing by wavelength encoding due to a phase Fresnel lens. The axial resolution is related with the measure of the FWHM value of every spectral response.

Taking into account the need to characterize the foot in its dimensions with the objective to prevent and correct deformities, an optical system that allows its D reconstruction using the laser triangulation principle was created. Parameters are measured on the digitalized 3D image that is obtained of the foot.

The chromatic confocal method to measure the refractive index and thickness of membranes is developed. The method is based on the longitudinal chromatic aberration produced by a diffractive element. The identification of the maximal spectral components coming from the membranes are used for measuring its thickness or its refractive index.

In this work the Gray code method for numerical D reconstruction of complicated objects was implemented. Based on structured projection, the Gray code method projects in different binary patterns. Grouping this sequence, this sequence of patterns allow to describe 2n different directions of projection, where each direction corresponds to a word in...

In the industrial application field, the presence of blisters in coated steel is an important quality factor of the protection coating applied on the surface. In this work, an optical system of three-dimensional reconstruction for the detection quantitative evaluation of blisters in polymer coated steel was implemented. The implemented optical syst...

In this paper a confocal profilometer using longitudinal chromatic aberration is presented. The system uses a novel polychromatic illumination source generated by means of non-linear effects in a standard single-mode optical fibre. A wavelength?height codification is realized using the chromatic aberration of a Fresnel lens. The height decoding is...

Se describe un sistema dedicado al análisis micro-topográfico de una superficie, basado en la técnica de triangulación láser. La resolución es de orden del micrómetro y el campo de observación es 9 mm2. Se discuten y presentan resultados experimentales

A method for the verification of handwritten signatures based on the three-dimensional correlation is proposed. The input images to the algorithms of 3D correlation are those range images obtained from the 3D information formed by the signature path. An optic system based on the laser triangulation method, allows the extracting of 3D information. T...

In the present work an optical system of three-dimensional reconstruction for the quantitative analysis of corrosion in metallic structures is implement ed. The main objective of our system consists of detection and evaluation of superficial topographic changes caused by the corrosion. The superficial changes are quantitatively obtained from the 3D...

A method for the verification of handwritten signatures based on the three-dimensional correlation is proposed. The input images to the algorithms of 3D correlation are those range images obtained from the 3D information formed by the signature path. An optic system based on the laser triangulation method, allows the extracting of 3D information. T...

Our aim is to describe a method for detecting small deformations from a three-dimensional (3D) shape of large lateral dimensions. For this purpose the measurement method is based on the simultaneous utilization of several 3D optical systems and the phase-shifting technique. In this way, the following problems appear: optical distortion due to the l...

The 3D information of an object increases the discrimination ability of a pattern recognition system. A new digital procedure based on the correlation between range images is described. The results of synthesis of a 3D phase-only filter are presented. A range image represents a topography of a free-form surface in a 3D scene. All the possible 3D co...

This communication introduces the Optics and Signal Processing Group from Universidad Industrial de Santander at Bucaramanga, Colombia. First, a brief description of how the group was formed, its strategic importance and also some of its more important achievements are presented. Then, the main scientific domains where the group carries out its res...

RESUMEN En este trabajo se implementa la técnica de código de grises para la reconstrucción 3D de objetos con dimensiones máximas en el rango de milímetros a metros; como una alternativa de solución a la reconstrucción de objetos discontinuos. Esta técnica consiste en la proyección de patrones binarios bidimensionales que al agruparse definen espac...

Recibido 22 de Oct. 2007; Aceptado 3 de Mar. 2008; Publicado en línea 15 de Abr. 2008 Resumen En este trabajo se desarrolla un método para medir el índice de refracción y el espesor de tejidos. El modelo experimental se basa en la aberración cromática longitudinal producida por un elemento difractivo. El disposi-tivo está compuesto por un sistema d...

Resumen En la actualidad existen diversos sistemas ópticos para el análisis de superficies a partir de reconstrucciones 3D del objeto. Las técnicas intereferométricas ofrecen resoluciones axiales adecuadas para el análisis de objetos de algunas micras de altura. La interferometría con luz monocromática presenta inconvenientes en objetos que poseen...

Con el fin de realizar un análisis experimental de la evolución de la topografía de un cuerpo es importante calcular la forma tridimensional de la superficie en cualquier instante a partir un sistema coordenado global-fijo. En este trabajo se plantea un alternativa que permite reconstruir la forma 3D del cuerpo a partir de un sistema coordenado glo...

El uso de proyección de franjas para obtener la topografía de un cuerpo es una técnica que ha sido ampliamente utilizada en aplicaciones industriales y médicas. Franjas paralelas son proyectadas sobre la superficie del objeto a estudiar, ya sea con un sistema convencional de proyección utilizando una red de paso constante o utilizando patrones de i...