izpis_h1_title_alt

Nekateri postopki za izboljšanje in poravnavanje podvodnih slik
GOLJAT, ROK (Author), Kovačič, Stanislav (Mentor) More about this mentor... This link opens in a new window

.pdfPDF - Presentation file, Download (12,01 MB)

Abstract
V pričujočem delu so bile preizkušene nekatere metode obdelav podvodnih slik, z namenom vizualne izboljšave in izgradnje panoramskih slik. Preizkušene so bile nekatere metode izboljšanja slik s preslikavo sivin, kot so gama preslikave, metoda ravnanja histogramov in metoda adaptivnega ravnanja histogramov. Preizkušene so bile tudi nekatere metode obnavljanja slik, kot so na primer ostrenje z megljenjem, slepa dekonvolucija in Wienerjevo filtriranje. Sledilo je iskanje značilk na podlagi SIFT algoritma in nato s pomočjo njih, še izračun ustreznih transformacijskih matrik, ki jih potrebujemo za poravnavo slik. Drugi del naloge je zajemal preizkušanje raznih metod izgradnje panoramskih slik, kot so metode lepljenja slik, izgradnja slike s pomočjo medianinega filtriranja kupčka poravnanih slik in metoda, kjer posamezne slikovne elemente prepišemo iz tiste slike v kupčku poravnanih slik, katere center je najbližji temu slikovnemu elementu. Celotna realizacija naloge je bila preizkušena in izvedena v programskem okolju MATLAB. Uspešnost izboljšanja in obnavljanja slik smo določili z očnim primerjanjem slik pred in po obdelavi. Med preizkušenimi metodami izboljšanja in obnavljanja slik sta se kot najbolj primerni izkazali metodi adaptivnega ravnanja histogramov in ostrenja z megljenjem. Med preizkušenimi metodami za izgradnjo panoramskih slik, pa je bila najbolj primerna zadnja izmed prej naštetih metod.

Language:Slovenian
Keywords:podvodno snemanje, izboljšava slik, restavracija slik, ravnanje histogramov, panoramske slike, značilke, geometrijske preslikave
Work type:Master's thesis/paper (mb22)
Organization:FE - Faculty of Electrical Engineering
Year:2015
Views:601
Downloads:141
Metadata:XML RDF-CHPDL DC-XML DC-RDF
 
Average score:(0 votes)
Your score:Voting is allowed only to logged in users.
:
Share: Bookmark and Share

Secondary language

Language:English
Title:Some methods for enhancement and registration of underwater images
Abstract:
The thesis addresses some known methods of underwater image processing with the goal of visualy improving images and creating a larger panoramic image. The first aim of the thesis is to use known and promising methods for image enhancement and image restoration and apply them to underwater video sequences of the sea floor. Image enhancement methods that were being tested were gamma correction, histogram equalization and adaptive histogram equalization. Image restoration methods that were being tested were unsharp masking, blind deconvolution and wiener filtering. The second aim of the thesis is to produce a panoramic image of a better quality than the individual images by geometric alignment of images in a time sequence and by combining overlapping images together. The first step was to match neighboring frames by extracting features using a SIFT algorithm and then using those feature pairs, to estimate geometric transformation matrices, that we need for alignment of frames. Tested methods for creating panoramic images were blending, median filtering and a method, that built a panoramic image by selecting pixels of those images, whose centers were closest to the location of that pixel. The whole thesis was realized and tested in MATLAB. We selected the most appropriate method of image enhancement and restoration by visually comparing images before and after processing. Of all the tested methods of image enhancement and restoration, adaptive histogram equalization and unsharp masking were picked as the most appropriate one. Of all the tested methods of panoramic image creation, the one that based on calculating distances was picked as the most appropriate one.

Keywords:underwater imaging, image enhancement, image restoration, histogram equalization, panoramic images, features, geometric transforms

Similar documents

Similar works from RUL:
Similar works from other Slovenian collections:

Comments

Leave comment

You have to log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back