Search results for "Images"

Roadmap on digital holography [Invited]

2021

This Roadmap article on digital holography provides an overview of a vast array of research activities in the field of digital holography. The paper consists of a series of 25 sections from the prominent experts in digital holography presenting various aspects of the field on sensing, 3D imaging and displays, virtual and augmented reality, microscopy, cell identification, tomography, label-free live cell imaging, and other applications. Each section represents the vision of its author to describe the significant progress, potential impact, important developments, and challenging issues in the field of digital holography.

Interfaces and Environments

2011

HEp-2 Cell Classification with heterogeneous classes-processes based on K-Nearest Neighbours

2014

We present a scheme for the feature extraction and classification of the fluorescence staining patterns of HEp-2 cells in IIF images. We propose a set of complementary processes specific to each class of patterns to search. Our set of processes consists of preprocessing,features extraction and classification. The choice of methods, features and parameters was performed automatically, using the Mean Class Accuracy (MCA) as a figure of merit. We extract a large number (108) of features able to fully characterize the staining pattern of HEp-2 cells. We propose a classification approach based on two steps: the first step follows the one-against-all(OAA) scheme, while the second step follows the…

Questioning the Images of Atrocity: An Introduction

2015

The images of atrocity, either analog or digital, are always the trace of an encounter between the gaze of a photographer or a cameraman and a human being suffering from the painful effects of man-made violence. The archive images resulting from such an encounter raise some inevitable questions: who took them and for what purpose? Is it possible to retrace the process that led to these shots? What do they hide behind what the eye can see? Owing to their defective nature and the changes they have endured throughout history, these images strongly contribute to shape collective memory by becoming real sites of memory for ethnic or national communities. Therefore, the archive of human pain, enc…

Icono(bio)logia dei simulacri

2014

Investigating mathematics teacher identity development: A theoretical consideration

2015

International audience; The paper discusses a theoretical framework for investigating the process of becoming a mathematics teacher, based on the need to better understand how mathematics and teaching combine in developing mathematics teacher identities. Identity is understood as a function of participation in and at the boundaries of various communities of practice, during university teacher education and at school. In order to reveal possible relationships between developing teacher identities and the discipline of mathematics, teachers' changing concept images of mathematics are embedded within the definition of identity.

Development and evaluation of image-series for portion size estimation in dietary assessment among adults

2021

AbstractPortion size images are advantageous in dietary assessment. The aim of the present study was to develop and validate new culturally specific image-series for portion size estimation to be used in a new Norwegian version of a British web-based dietary assessment tool (myfood24). Twenty-three image-series of different foods, each containing seven portion size images, were created and validated in a group of adults (n41, 58 % female) aged 19–44 (median 23), out of which 63 % had higher (tertiary) education. The participants compared 46 portions of pre-weighed foods to the portion size images (1886 comparisons in total). Portion size estimations were either classified as correct, adjace…

Digital Image Processing in the Analysis of Astrometric Plates

1991

AbstractIn this paper, we display an improvement to our process of semi-automatic measuring of astrometric plates, in which the photometric sensor is substituted by a CCD system of image getting and digitalization. The advantages of this method are analyzed taking into account the possibilities of the image analysis in the space and frequency domain.

A Color Image Database for Haze Model and Dehazing Methods Evaluation

2016

International audience; One of the major issues related to dehazing methods (single or multiple image based) evaluation is the absence of the haze-free image (ground-truth). This is also a problem when it concerns the validation of Koschmieder model or its subsequent dehazing methods. To overcome this problem, we created a database called CHIC (Color Hazy Image for Comparison), consisting of two scenes in controlled environment. In addition to the haze-free image, we provide 9 images of different fog densities. Moreover, for each scene, we provide a number of parameters such as local scene depth, distance from the camera of known objects such as Macbeth Color Checkers, their radiance, and t…

Ghost Detection and Removal for High Dynamic Range Images: Recent Advances

2012

23 pages; International audience; High dynamic range (HDR) image generation and display technologies are becoming increasingly popular in various applications. A standard and commonly used approach to obtain an HDR image is the multiple exposures fusion technique which consists of combining multiple images of the same scene with varying exposure times. However, if the scene is not static during the sequence acquisition, moving objects manifest themselves as ghosting artefacts in the final HDR image. Detecting and removing ghosting artefacts is an important issue for automatically generating HDR images of dynamic scenes. The aim of this paper is to provide an up-to-date review of the recentl…