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Photo-response non-uniformity (PRNU) noise has been recognized as a unique fingerprint of digital cameras. However, how to extract precise PRNU noise from a given image is a main challenge. Previous literatures assume PRNU noise is a white Gaussian noise (WGN) and extracted by an additive denoising filter (ADF). However, experiments have demonstrated that the PRNU noise is a multiplicative noise....
Depth map estimation is one of the important research areas in image processing. This paper proposes an improved depth map estimation approach from a video stream of cartoon. It is based on the motion detection. Most depth map estimation approaches based on motion detection usually have two disadvantages. One is that the depth values of the same object have big differences. The other is time-consuming...
Using distance geometry concepts and distance geometry constraints, this paper proposes a new abundance estimation method for hyperspectral unmixing, which improves current hyperspectral unmixing algorithms in several aspects. Firstly, considering the geometric structure of dataset by the distance geometry constraint, the optimal result with least geometric deformation can be obtained. Secondly, the...
Fingerprint ridge distance is a very useful parameter in AFIS (automatic fingerprint identification system), it can be used for fingerprint enhancement, identification or classification. In this paper, a new ridge distance estimation method based on the ridge search is presented. Firstly, we use the IPL(initial points line) to select the initial-points line. Then, we follow ridges with the search...
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