Guo-Shiang Lin

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A passive scheme is developed to achieve frame duplication detection for videos in the paper. The proposed scheme is a coarse-to-fine approach and composed of candidate clip selection, spatial correlation calculation, and frame duplication classification. To screen duplicated candidates in the temporal domain, the histogram difference of two adjacent frames(More)
1 Dept. of Computer Science and Information Engineering, Da-Yeh University, Chang-Hua, Taiwan, R.O.C. Address: 112 Shan-Jiau Rd., Da-Tsuen, Changhua County 515, Taiwan, R.O.C. Tel: 886-4-8511888 ext. 2405 Fax: 886-4-5811350 Email: 2 Dept. of Electrical Engineering, National Chung Cheng University, Chia-Yi, Taiwan, R.O.C. Address: 168,(More)
In this paper, the authors propose a watermarking scheme that embeds both image-dependent and fixed-part marks for dual protection (content authentication and copyright claim) of JPEG images. To achieve the goals of efficiency, imperceptibility, and robustness, a compressed-domain informed embedding algorithm, which incorporates the Lagrangian multiplier(More)
In this paper, we propose a passive-blind scheme for detecting forged images. The scheme leverages quantization table estimation to measure the inconsistency among images. To improve the accuracy of the estimation process, each AC DCT coefficient is first classified into a specific type; then the corresponding quantization step size is measured adaptively(More)
The shot change is the first step of video segmentation. Therefore, designing an efficient and low-complexity shot change detection becomes a significant issue. In this paper, we propose a simple and effective approach to detect abrupt shot changes based on interframe difference algorithm. Our approach can decrease false/miss caused by fast object motion(More)
In this paper, a prescription-based error concealment (PEC) method is proposed. PEC relies on pre-analyses of the concealment error image (CEI) for I-frames and the optimal error concealment scheme for P-frames at encoder side. CEI is used to enhance the image quality at decoder side after error concealment (by spatial interpolation or zero motion) of the(More)
A statistical feature-based scheme is proposed to identify the data hiding domain of an embedded signal in this research. Two phenomena are observed for images before and after data hiding. First, the gradient energy increases as the continuity of gray levels between adjacent pixels is disturbed by the embedded signal. Second, the statistical variance of(More)