Coloured and Gray Scale Image Steganography using Block Level DWT DCT Transformation

Abstract

Piracy is a big threat to the original contents. This multi-model approach interleaves some frequency domain watermarking strategies to counteract shortcomings of one strategy by the advantages of other. The original image is divided into spatially disjoint blocks. Watermarking is a way of embedding a mark that hides information in a multimedia carrier. Major issues in Image watermarking are to increase the robustness visual attacks. Image The Proposed algorithm presents Hybrid Discrete wavelet transform and Discrete cosine transform based watermarking technique to obtain increased imperceptibility and robustness compared to DWT based watermarking technique. The idea of inserting embedding image in combined transform is based on fact that joint transform eliminates drawback of each other and secret information is hidden in High frequency area which signify the noise in image and characteristics of image is not changed.

A Good Performance OTP Encryption Image based on DCT-DWT Steganography

“…In this study, DC coefficients of DCT transform and LL subband on DWT transformation were chosen as the place of embedding of message image. Based on the results comparable with the studies [13], [14], and [24], the proposed method suggests that the PSNR score is higher than the previous three studies.…”

“…This result is a perfect extraction result. In this study also performed comparisons with studies conducted by [13], [14], and [24]. In the study [13] and [14] used a combination of DCT and DWT transformations, while in the study [24] only used DCT transformation.…”

“…Research conducted by [13] and [14] both use two transformations ie DWT and DCT. In the study [14] additionally Arnold's transformation to improve the security of the message image.…”

“…Another advantage is that DCT is used as the standard transformation of JPEG and DWT as the standard transformation of JPEG 2000 [10]. In other studies [11][12][13][14] evidenced by the merging of these two transformations in a steganographic scheme can be further optimized.…”

Watermarking Medical Image Menggunakan Discrete Wavelet Transform Berbasis Kompresi Run Length Encode

“…Salah satu pendekatan solusi untuk identifikasi data citra medis adalah watermarking, definisi dari watermarking yaitu teknik menyembunyikan data ke dalam konten multimedia seperti gambar, video atau audio dimana citra terwatermarked dapat diekstrak. Pada penelitian lainnya digital watermarking digunakan untuk meningkatkan keamanan citra medis, kerahasiaan dan integritas [3]- [6]. Dilihat dari data yang berupa citra maka dapat diprediksi kebutuhan memori data lebih besar jika dibandingkan dengan data berupa teks, umumnya gambar disimpan dengan format joint photographic expert group (JPEG) atau bitmap (BMP) format.…”