Browsing by Subject "image enhancement"

Now showing 1 - 7 of 7

Access status: Open Access ,
Algorytm pseudokolorowania obrazów medycznych
(2005) Ciecholewski, Marcin
W pracy zaprezentowano algorytm umożliwiający pseudokolorowanie obrazów szarych, jak również przedstawiono rezultaty uzyskane dla określonych zdjęć medycznych. Zaproponowano technikę polegającą na konwersji bitmap o kolorze szarym z jednowymiarowej przestrzeni barw do przestrzeni trójwymiarowej. Zastosowana metoda umożliwia wyodrębnienie szczegółów obrazu w postaci kolorów, niewidocznych w czarno-białych obrazach medycznych, i w efekcie ułatwia ich analizę. W artykule przedstawiono też określone modele barw, stosowane w grafice komputerowej i wykorzystane podczas realizacji algorytmu.
Access status: Restricted ,
Analiza wybranych metod integracji obrazów satelitarnych
(Data obrony: 2011-07-15) Rumanek, Anna
Wydział Geologii, Geofizyki i Ochrony Środowiska
Presented thesis described issues for merging lower-resolution spectral data (Landsat) with panchromatic images of higher resolution (IRS). It discussed the theory about satellite images, methods of fusion and an attempt to assess merged images. Then, five methods of merging satellite data have been tested: IHS, HPF, CN, Brovey’a, WMK. To assess the interpretability of information and thematic distortion of combined pictures, statistic methods, ‘result diagram’ and visual interpretation were applied.
Access status: Open Access ,
Aspekty metodyczne integracji danych teledetekcyjnych w oparciu o metodę IHS i jej modyfikacje
(Wydawnictwa AGH, 2006) Mularz, Stanisław; Pirowski, Tomasz
Effective monitoring of urban and industrial agglomerations requires possessing image information of a great degree of accuracy. It is a necessary condition to capture the objects of relatively small size and reproduce structural and textural features characteristic for different elements of urban environment. Such a requirement is fulfilled by high-resolution satellite images, however receiving data is expensive and spectral registration limited to four channels (IKONOS, QuickBird) or only and exclusively to panchromatic channel (EROS, IRS 1C/D), which limits the interpretation and classification of information and makes particularly difficult sensing and valuation of urban green areas. On the other hand, a relatively cheap, multi-spectral system of Landsat TM is characterized by too low spatial resolution for this type of studies. The article presents the idea of integrating satellite images Landsat ETM+ (30 m) with panchromatic image IRS 1C (5.8 m). Properly done integration of this sort of data leads into getting remote sensing materials of rich spatial and spectral information. In the studies - as a initial method of integration IHS standard was accepted. From the analyses earlier carried out by the authors in the area of KWB Bełchatów it can be stated that this method has great interpretation values, despite introducing high deformations into synthetic images. The studies carried out by authors go towards the limitation of this disadvantage by proposing the modifications of the standard. The obtained results were compared to standard IHS method and other classical methods of integration such as PCA, HPF, CN. To assess the content and the distribution of information and the degree of spectral deformation of combined pictures, statistic methods and visual interpretation were applied.
Access status: Open Access ,
Kalibracja systemu wizyjnego z kamerą CCD na potrzeby wysokotemperaturowych pomiarów właściwości powierzchniowych
(Wydawnictwa AGH, 2007) Fabijańska, Anna; Sankowski, Dominik
This paper presents a technique for calibration of CCD camera system for digital image quantitative analysis applications. Especially high temperature measurements of surface properties are considered. The calibration process is focused on correction of these defects that arise from CCD chip imperfections and can influence on accuracy of object shape projection.
Access status: Metadata only ,
Rozszerzony model logarytmicznego przetwarzania obrazów
(Wydawnictwa AGH, 2011) Vorobel, Roman; Stobińska, Magdalena
The analysis of the Jourlin-Pinoli model for logarithmic image processing is shown. Extended model using new universal algebra for logarithmic image processing is build. This method is based on the new universal algebra with extended operations of addition and multiplication by scalar. The results of such operation are real numbers, which can be not only positive but also negative. New method for images enhancement with affine transforms is proposed. The studies are illustrated by computational examples.
Access status: Open Access ,
Two-pass median filter for impulse noise removal
(Wydawnictwa AGH, 2009) Fabijańska, Anna
In this paper the new approach to impulse noise removal is introduced. Described algorithm involves modification of median filtration mechanism. However, in opposition to traditional approach only pixels corrupted by noise are filtered. Results of applying introduced method to exemplary images are presented and compared with results achieved with traditional approaches. Moreover, the performance of the method is analyzed. Factors influencing efficiency of noise removal using proposed algorithm are deliberated.
Access status: Open Access ,
Wykorzystanie kontrastu stosowanego w nieostrym maskowaniu
(Wydawnictwa AGH, 2006) Vorobel, Roman; Stobińska, Magdalena
The paper presents analysis of methods for image quality enhancement for increasing distinguish ability of the details. Methods for unsharp masking are emphasized. It is shown, that the relative local contrast can be the base for construction of unsharp masking methods. Optimization of Iow frequency image component transformation is proposed and discussed. Advisability of proposed solutions in the examples is verified.