Hsien-Wen Tseng

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For some applications such as satellite and medical images, reversible data hiding is the best solution to provide copyright protection or authentication. Being reversible, the decoder can extract the hidden data and recover the original image without distortion. In this paper, a reversible data hiding scheme based on prediction error expansion is proposed.(More)
Many coding standards, such as JPEG, H.261, H.263, MPEG-1, MPEG-2, use variable length codes (VLC) as their entropy coding strategy. However, VLC have a big drawback when transmitting over a noisy channel. This drawback is an error propagation problem. For this reason, reversible variable length codes (RVLC) have been used to enhance the error resilient(More)
The JPEG image is the most popular file format in relation to digital images. However, up to the present time, there seems to have been very few data hiding techniques taking the JPEG image into account. In this paper, we shall propose a novel high capacity data hiding method based on JPEG. The proposed method employs a capacity table to estimate the number(More)
In this paper, a novel steganographic method based on JPEG is proposed. We take advantage of the quantization error resulting from processing the JPEG-compressed image with two different scaling factors. One of the scaling factors is used to control the bit rate of the stego-image while the other is used to guarantee the quality of the stego-image. Our(More)
In this paper, a very low bit rate image compression scheme is proposed. This scheme is a hybrid method that combines the good energy-compaction property of DCT with the high compression ratio of VQ-based coding. We start by transforming image block from spatial domain to frequency domain using DCT. In order to increase the compression ratio while(More)
The pixel-value differencing (PVD) scheme uses the difference value between two consecutive pixels in a block to determine how many secret bits should be embedded. There are two types of the quantization range table in Wu and Tasi’s method. The first was based on selecting the range widths of [8, 8, 16, 32, 64, 128], to provide large capacity. The second(More)
This paper proposes a simple data hiding technique for binary images. The binary cover image is partitioned into equal-sized, non-overlapping blocks and the watermark will be embedded into blocks by flipping pixels. The weight mechanism is also proposed to find the most suitable flip pixel in the block. In order to improve the visual quality of the stego(More)