Histogram Uniformization for Digital Image Encryption

Author

Lima, Juliano B. ; De Souza, Ricardo M Campello

Author_Institution

Dept. of Math., Fed. Univ. of Pernambuco, Recife, Brazil

fYear

2012

fDate

22-25 Aug. 2012

Firstpage

55

Lastpage

62

Abstract

In this paper, histogram uniformization of digital images by means of the finite field cosine transform (FFCT) is examined. The approach consists in dividing the image into blocks and applying the FFCT, in a recursive manner, to each block. Simulations of the procedure show that the histogram of the transformed image exhibits a uniform shape and its pixels have low correlation with their neighbors. This result is achieved due to the modular arithmetic used in the application of the FFCT to the image blocks. The suitability of the proposed technique in the context of image encryption is discussed.

Keywords

cryptography; image processing; transforms; FFCT; digital image encryption; finite field cosine transform; histogram uniformization; image blocks; image division; image pixels; modular arithmetic; Correlation; Digital images; Encryption; Equations; Histograms; Measurement; Transforms; finite field cosine transform; histogram uniformization; image encryption;

fLanguage

English

Publisher

ieee

Conference_Titel

Graphics, Patterns and Images (SIBGRAPI), 2012 25th SIBGRAPI Conference on

Conference_Location

Ouro Preto

ISSN

1530-1834

Print_ISBN

978-1-4673-2802-9

Type

conf

DOI

10.1109/SIBGRAPI.2012.17

Filename

6382739