Συντάχθηκε 12-10-2015 13:49
από Esthir Gelasaki
Email συντάκτη: egelasaki<στο>tuc.gr
Ενημερώθηκε:
-
Ιδιότητα: υπάλληλος.
ΠΟΛΥΤΕΧΝΕΙΟ ΚΡΗΤΗΣ
Σχολή Ηλεκτρονικών Μηχανικών και Μηχανικών Υπολογιστών
Πρόγραμμα Προπτυχιακών Σπουδών
ΠΑΡΟΥΣΙΑΣΗ ΔΙΠΛΩΜΑΤΙΚΗΣ ΕΡΓΑΣΙΑΣ
ΑΛΕΞΑΝΔΡΟΥ ΝΤΟΥΣΑΚΗ
με θέμα
Μέθοδος και σύστημα μέτρησης της υποθαλάσσιας ορατότητας.
Method and system for measuring underwater visibility.
Τρίτη 13 Οκτωβρίου 2015, 1:30μμ
Αίθουσα 137.Β73, Κτίριο Επιστημών, Πολυτεχνειούπολη
Εξεταστική Επιτροπή
Καθηγητής Κωσταντίνος Μπάλας (επιβλέπων)
Καθηγητής Κωσταντίνος Καλαϊτζάκης
Δρ. Ναθαναήλ Κορτσαλιουδάκης
Abstract
The golden standard for measuring the performance of an imaging system is Modulation Transfer Function (MTF). Every optical part of the imaging system has its own MTF contributing to the overall, as a measurement of sharpness. The two most common methods for obtaining the MTF from an image, Direct square wave analysis and Slanted edge analysis were performed in an experimental setup with the latter being the faster one in the image processing procedure. This thesis presents an innovative idea of measuring the optical properties of water using a custom made multispectral underwater imaging system based on this function. Obtaining pictures under the surface of the sea, water can be considered as part of the overall imaging system. Measuring and comparing the MTF underwater to the MTF of the imaging system on land can lead to valuable results about water interference in the degradation of underwater vision. In addition, MTF curves were measured over discrete wavelengths of the light spectrum from the violet to near infrared region in order to obtain data about the source of this degradation which is the absorption and scattering of light by water molecules and matter particles.
