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Conventional secret message passing methods embed a message in the cover-text, so the receiver must use stego-text to extract the message content. In contrast, this paper proposes a new paradigm in which the receiver does not necessarily require stego-text to retrieve the message content. Under the proposed approach, the sender can produce keys without modifying the cover-image, and the intended recipient...
Multiple description video coding (MDC) is one of the techniques used to reduce the detrimental effects caused by transmission over error-prone networks. This paper presents a hybrid MDC method which segments the video along spatial and temporal dimensions, and provides efficient estimation methods for missing description reconstruction. The experimental results confirm the improved error resilience...
In this paper, the code transformation algorithms between the fixed binary linear quadtree scheme (FBLQ)and the constant bit-length linear quadtree scheme(CBLQ) are proposed. There exists no code transformation algorithm between FBLQ and CBLQ. To solve this problem that when one receives a FBLQ or CBLQ code and does not have the corresponding decoding program, with our new code transformation algorithms...
In this paper, a new adaptive image compression scheme based on JPEG was proposed to improve the image quality of the JPEG baseline sequential image compression codec. In this scheme, the Hough transformation technique is employed as an edge-oriented classifier to categorize image blocks into four classes. Different types of image blocks are processed by different quantization and encoding ways for...
In this paper, a watermarking-based image authentication scheme used to verify the contents of transmission grayscale images is proposed. In this scheme, the watermark of one given image is generated from both frequency domain and spatial domain. First, the number of encoding stages of each DWT coefficient during the multi-stage encoding is taken as frequency watermark. Second, the mean values of...
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