Image Compression and Encryption Using Discrete Fractional Cosine Transform
نویسندگان
چکیده
,PDJH SURFHVVLQJ PRVW IUHTXHQWO\ XVHV WKH WUDQVIRUPV OLNH 'LVFUHWH &RVLQH 7UDQVIRUP RU )RXULHU WUDQVIRUP IRU LPDJH FRPSUHVVLRQ 7KLV LQYROYHV WKH FRQYHUVLRQ RI WKH VRXUFH VLJQDO WR IUHTXHQF\ FRPSRQHQW 7KH DSSOLFDWLRQ RI )UDFWLRQDO YHUVLRQ RI FRVLQH WUDQVIRUP FDOOHG 'LVFUHWH )UDFWLRQDO &RVLQH 7UDQVIRUP WR LPDJH FRPSUHVVLRQ LV IDLUO\ QHZ ')5&7 VKDUHV PDQ\ XVHIXO SURSHUWLHV RI UHJXODU '&7 LW KDV IUHH SDUDPHWHU LWV IUDFWLRQ :KHQ LW LV ZH JHW FRVLQH PRGXODWHG YHUVLRQ RI LQSXW VLJQDO :KHQ LW LV XQLW\ ZH JHW FRQYHQWLRQDO '&7 $V WKH IUDFWLRQ FKDQJHV IURP WR ZH JHW GLIIHUHQW IRUPV RI VLJQDO ZKLFK LQWHUSRODWH EHWZHHQ FRVLQH PRGXODWHG IRUP RI VLJQDO LWV '&7 VLJQDO UHSUHVHQWDWLRQ 'XH WR LWV IUHH SDUDPHWHU LWV D '5)&7 PD\ ILQG LWV SODFH LQ PDQ\ DSSOLFDWLRQV OLNH LPDJH HQFU\SWLRQ LPDJH FRPSUHVVLRQ ZKHUH '&7 LV IRXQG WR EH XVHIXO '5)&7 SURYLGHV ORZ 0HDQ 6TXDUH (UURU KLJK 3HDN 6LJQDO 1RLVH 5DWLR DV FRPSDUH WR '&7 IRU LPDJH FRPSUHVVLRQ $QRWKHU NH\ DGYDQWDJH RI '5)&7 LV WKDW LW LV XVHG IRU LPDJH HQFU\SWLRQ XVLQJ UDQGRP SKDVH PDVNLQJ 7KLV WHFKQLTXH SURYLGHV PRUH VHFXUH LPDJH HQFU\SWLRQ ORZ YDOXH RI 0HDQ 6TXDUH (UURU ZLWK WKH DGGLWLRQ RI H[WUD GHJUHH RI NH\V SURYLGHG E\ WKH IUDFWLRQV RI '5)&7
منابع مشابه
High Security Multiple-image Encryption using Discrete Cosine Transform and Discrete Multiple-Parameter Fractional Fourier Transform
—A multiple-image encryption scheme is proposed by using discrete cosine transform and discrete multiple-parameter fractional Fourier transform (DMPFRFT). Each image is performed by discrete cosine transform and filtering procedure and then multiplexed into a complex signal. After operated by a pixel scrambling, the complex signal is multiplied by random phase mask, and then encrypted into one...
متن کاملSingle-Channel Color Image Encryption Using the Reality-Preserving Fractional Discrete Cosine Transform in YCbCr Space
A novel single-channel color image encryption algorithm is proposed, which utilizes the reality-preserving fractional discrete cosine transform in YCbCr space. The color image to be encrypted is decomposed into Y, Cb, and Cr components, which are then separately transformed by Discrete Cosine Transform (DCT). The resulting three spectra sequences, obtained by zig-zag scanning the spectra matric...
متن کاملA Robust Watermarking Approach using DCT-DWT
This paper presents a robust watermarking technique for color and grayscale image. The proposed method involves many techniques to conform a secure and robust watermarking. In the proposed technique the watermark is embedded in 3 level of DWT (Discrete Wavelet Transform) and before embedding the watermark image is passed through chaotic encryption process for its security, other important thing...
متن کاملEnhanced System for image's compression and encryption by addition of biometric characteristics
In case of transmission of fast and protected information, it is important to carry out two operations distinctly. The first, is an operation of encryption, which aims to modify the compressed information to make them unreadable to whoever does not have the necessary authorization to see them (in this paper, we propose give this authorization by using a fingerprint image). The second is an oper...
متن کاملA Modified Digital Image Watermarking Scheme Based on Nonnegative Matrix Factorization
This paper presents a modified digital image watermarking method based on nonnegative matrix factorization. Firstly, host image is factorized to the product of three nonnegative matrices. Then, the centric matrix is transferred to discrete cosine transform domain. Watermark is embedded in low frequency band of this matrix and next, the reverse of the transform is computed. Finally, watermarked ...
متن کاملImage encryption schemes for JPEG and GIF formats based on 3D baker with compound chaotic sequence generator
This paper proposed several methods to transplant the compound chaotic image encryption scheme with permutation based on 3D baker into image formats as Joint Photographic Experts Group (JPEG) and Graphics Interchange Format (GIF). The new method averts the lossy Discrete Cosine Transform and quantization and can encrypt and decrypt JPEG images lossless. Our proposed method for GIF keeps the pro...
متن کامل