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For the weakness of the pixel-based stereo matching, setting segment as a processing element is more practical. This paper presents a new segment-based stereo matching method using edge dynamic programming (DP). Firstly, from the perspective of human stereo vision, the reference image is segmented by an object-oriented segmentation method, which simulates human perceptual process and fully takes shape,...
Most stereo matching algorithms are pixel-based. From the perspective of human stereo vision, setting segment as a processing element is more practical. A new fast stereo matching algorithm based on segmentation with ground control points (GCPs) is presented in this paper. Firstly, an object-oriented segmentation method is used to segment the reference image, which not only considers color characteristics,...
A new secure fragile watermarking algorithm for secure communication is proposed in this paper, the idea of cryptography- and the idea of side information are introduced into the security domain of watermarking system. The main idea of the algorithm can be listed as follow. Firstly, the original image is segmented into blocks and the watermark is segmented into subsections. Secondly, the embedded...
In many imaging applications, the continuous phase information of the measured signal is wrapped to a single period of 2pi, resulting in phase ambiguity. In this paper we consider the two-dimensional phase unwrapping problem and propose a maximum a posteriori (MAP) framework for estimating the true phase values based on the wrapped phase data. In particular, assuming a joint Gaussian prior on the...
Semi-fragile watermarking which is robust to given operations and fragile to conscious operations, is a useful authentication technique for digital media. In this paper, a novel semi-fragile image watermarking algorithm that accepts gradient sharpening is proposed. In the proposed algorithm, based on the theory of gradient sharpening, the watermark is embedded in the space domain by modifying the...
Semi-fragile watermarking technique which aims to discriminate malicious manipulations from admissible manipulations, is drawing many attentions in image authentication. In this paper, a novel semi-fragile image watermarking algorithm that accepts Laplacian sharpening is proposed. In the proposed algorithm, based on the theory of Laplacian sharpening, the watermark is embedded in the space domain...
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