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This study investigated a novel method of evaluating visually lossy images based on saccadic eye movements. In each trial, participants with normal vision were asked to indicate any visible changes in the image while their gaze positions were being monitored. The original image was replaced with compressed or blurred versions of the same image 150ms after the onset of each eye fixation, and the parameters...
In three-dimensional videos (3-DV) coding systems, depth maps are not used for viewing but for rendering virtual views. Therefore, the traditional rate distortion criterion (including distortion criterion, and Lagrangian multiplier) is not suitable for depth map coding. In order to design an effective rate distortion criterion for depth maps, the relationship between the distortion of synthesized...
In this paper, a robust blind watermarking scheme is proposed based on Non-Subsampled Contourlet Transform (NSCT) and Singular Value Decomposition (SVD). NSCT keeps the scale of the original image and has better performance than other wavelets in image denoising and enhancement applications. Thus, its coarse subband is more robust to common image processing attacks and suitable for embedding watermarks...
In this paper, a video watermarking scheme is proposed, which has high capacity and is robust against transcoding between MPEG2, MPEG4 and H.264. In the proposed scheme, the watermark is embedded into the DCT blocks and the frames in the same GOP are watermarked with the same watermark. During the embedding, the spatial relationship of DCT coefficient between an 8*8 block and its four 4*4 sub-blocks...
Video identification is extremely important in video browsing, database search and security. In this paper, we present a video hashing based on MDS (Multi-Dimensional Scaling) which is able to work under variable video transmission impairments and resistant to signal processing. In this method, each frame of the video is divided into blocks and compute its low and middle frequency DCT coefficients...
Quantization Index Modulation is an important class of watermark methods, which has been widely used in blind watermark applications. And it is well known that spread transform dither modulation (STDM), as an extension of QIM, has good performance in robustness to random noise and re-quantization. However, the quantization step sizes used in STDM are random numbers not taking the feature of the image...
Digital watermarking has been proposed as a solution to the problem of copyright protection of multimedia documents in networked environments. This paper implement tow algorithm schemes. First is the LSB (Least significant bit). In this scheme we can replace the least digit of digital image with watermarked information. Second, a discrete wavelet transform (DWT) based digital image watermarking blind...
In this paper we propose a novel invisible digital watermarking scheme based on singular value decomposition (SVD). In the proposed method, we first divide the image into 8x8 sub blocks, and then each block is decomposed by SVD. The second and third singular values of each block are exchanged if the watermark bit is 1, so the order of the SVs is not in the original descending order any more. This...
In this paper, a novel image watermarking scheme based on independent component analysis (ICA) is proposed. In the proposed scheme, the original image is sub-sampled firstly to obtain four sub-images, and the features of the original image are extracted by performing ICA to these sub-images, and then the feature, which has the largest variance, is selected out to be watermarked on its block DCT coefficients...
The number of medical images produced in cardiology and radiology department etc. is rising strongly. New challenges arise in efficient medical data management issues, such as information retrieval and security. A novel method of combining watermarking annotation with independent content feature (ICF) for medical image retrieval is proposed. ICF is extracted by independent component analysis (ICA)...
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