20.500.12556/DKUM-79720 Algoritmi steganografije v rastrskih slikah BMP diplomsko delo Steganographic algorithms in BMP raster images 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. 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. steganografija metoda najmanj pomembnega bita robna metoda histogramska metoda metoda cik-cak metoda spremembe stopnje sivine metrika SSIM metrika PSNR steganography least significant bit method edge-based method histogram method zig-zag method grayscale method SSIM metric PSNR metric true true false [I. Stanišovski] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2021-08-13 14:24:18 2021-10-18 07:31:39 2022-08-09 21:57:29 0000-00-00 00:00:00 2021 0 Maribor 0 Maribor VII, 37 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 004.62:004.412(043.2) 87875075 UN_Stanisovski_Igor_2021.pdf UN_Stanisovski_Igor_2021.pdf 1 86FCBA33F50451199887918527BCB537 9df89e4a3fbcd960e882b0906ffc6ae88ac4077bb8884469c2a0dbbf55fd2856 46ecf27b-fe85-11eb-a0e2-00155d581298 20.500.12556/dkum/9372cd3d-3850-4e1f-9d05-e1e11a76ed80 https://dk.um.si/Dokument.php?lang=slv&id=151740 Fakulteta za elektrotehniko, računalništvo in informatiko 0 0 0