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“Digital” or “numeric”?
Which of the two adjectives “digital” and “numeric,” both often used as nouns, should we use? Do they really mean the same thing? Their respective supporters are at loggerheads.
Draw me a picture!
"What is an image?" The answer to this seemingly straightforward question is far from obvious.
Different color systems
We live surrounded by color images. But what exactly are these colors? How are they defined, broken down, or reconstructed? Different representations are used in different contexts, the best known being RGB and CMYK.
The color of quarks
Matter is discrete: it consists of molecules, themselves made up of atoms, each containing a nucleus of positrons and neutrons surrounded by a cloud of electrons. All are regarded as "elementary particles"… yet there are dozens of them! How can such diversity be explained at the very foundations of matter?
An Emmy Award for Nantes University!
Patrick Le Callet, a faculty member and researcher at Nantes University's Laboratoire des sciences du numérique in Loire-Atlantique, has just been honored, through his university, with a Technology and Engineering Emmy Award from the US National Academy of Television Arts and Sciences.
The expanding uses of photogrammetry
Photogrammetry encompasses all the techniques that use parallax to produce digital three-dimensional models of objects from images taken from different viewpoints.
Deep fingerprint detection using 3D imaging
Who hasn't seen an action-film character use a severed finger to pass through a biometric security gate? With deep fingerprint detection, that is no longer possible!
An image as a matrix
When we speak of an "image," we need to know what kind of object we are dealing with: how is the image represented, what do we want to do with it, and what medium is it intended for? Mathematics lies at the heart of these questions. Here is a brief overview of the basic concepts involved.
Digital watermarks
No doubt your Internet searches have turned up images you liked but could not use because they were overlaid with a translucent image credit.
Steganography
For millennia, the most extraordinary tricks have been used to transmit hidden messages.
Vectors and matrices
Rectangular arrays of numbers can be added and multiplied. That is when they become matrices.