Algoritmi steganografije v rastrskih slikah BMP

diplomsko delo

Igor Stanišovski (Author), Borut Žalik (Mentor), David Jesenko (Co-mentor)

Abstract

V diplomskem delu smo se ukvarjali z algoritmi steganografije v rastrskih slikah. Opisali in implementirali smo metodo najmanj pomembnega bita, histogramsko metodo, metodo cik-cak, robno metodo in metodo spremembe stopnje sivine. Merili smo količino podatkov, ki jih lahko skrijemo, ne da bi izgled slike opazno spremenili. Za primerjavo originalne in stegoslike smo uporabili metriki PSNR in SSIM. Ob upoštevanju količine podatkov in popačenosti slike je najboljša metoda najmanj pomembnega bita z dvema bitoma, kot najslabša metoda pa se je izkazala metoda najmanj pomembnega bita s štirimi biti.

Keywords

steganografija;metoda najmanj pomembnega bita;robna metoda;histogramska metoda;metoda cik-cak;metoda spremembe stopnje sivine;metrika SSIM;metrika PSNR;diplomske naloge;

Data

Language:	Slovenian
Year of publishing:	2021
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FERI - Faculty of Electrical Engineering and Computer Science
Publisher:	[I. Stanišovski]
UDC:	004.62:004.412(043.2)
COBISS:	87875075
Views:	191
Downloads:	23
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Steganographic algorithms in BMP raster images
Secondary abstract:	In this thesis, we considered steganographic algorithms in raster images. We described and implemented the following approaches: the least significant bit method, the histogram method, the zig-zag method, the edge-based method, and the grayscale method. We measured the amount of data to be embedded without noticeable distortion to the image. PSNR and SSIM metrics were used to compare the original and stego images. Considering the amount of data and an image distortion, the best method is the least significant bit with two bits, while the least significant bit method with four bits turned out as being the worst method.
Secondary keywords:	steganography;least significant bit method;edge-based method;histogram method;zig-zag method;grayscale method;SSIM metric;PSNR metric;
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za elektrotehniko, računalništvo in informatiko, Računalništvo in informacijske tehnologije
Pages:	VII, 37 f.
ID:	13235336