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To improve comprehensive performance of denoising range images, an impulsive noise (IN) denoising method with variable windows is proposed in this paper. Founded on several discriminant criteria, the principles of dropout IN detection and outlier IN detection are provided. Subsequently, a nearest non-IN neighbors searching process and an Index Distance Weighted Mean filter is combined for IN denoising...
Existing dual image deblurring methods usually model blurred image pairs being taken from exactly the same viewpoint and restore a single clear image. This imposes a strong assumption that the latent clear images of both images must be completely identical. In contrast to this restricted scenario, we assume that the restored pair are different, but can be approximated by image warping due to small...
Wireless capsule endoscopy (WCE) is a new innovative solution for gastrointestinal disease detection. The image quality of WCE is not satisfactory for medical applications since some of them are dark and low-contrast. The WCE image enhancement is a challenge task, mainly because the diversity of the WCE images of different people and the need to preserve the local fine details of WCE images. Hence,...
Bullet mark comparison is one of the key techniques in the discovery of evidences in gun related cases. A bullet mark comparison method base on statistical method was presented in this paper. First the bullet marks data are gathered according to generally used equipment. Then set up frame for the bullet and analysis some kinds of error types existing in measurement. There are many coarse data that...
Most of the state-of-the-art algorithms of restoring single blurred image are sensitive to image noise and artifacts. Our idea is to learn an adaptive filter for blind deconvolution to remedy this problem. We use this auxiliary filter to progressively suppress image noise in early stage of kernel estimation, leading to a robust kernel estimation algorithm. Our approach can naturally handle image noise...
An adaptive inverse beamforming and CLEAN image processing method (IBF-CLEAN) was put forward to cancel tow ship noise. The tow ship noise is a wideband, spatially wide distributing noise with high intensity. It is the primary interference for towed line array. Inverse beamforming (IBF) can be used to cancel such directional noise. Iterative use of IBF can eliminate the reflection paths of the tow...
The algorithm of the dynamic range control (DRC) was applied in the research of the audio directional system. According to the feature of audio directional system, the implementation of the static curve was modified, and the model of DRC based on simulink was built. The calculation results demonstrate that DRC is an effective optimal method to enhance the main sound and reduce the noise in the audio...
A fully integrated variable gain amplifier circuit is reported in this paper. The amplifier is based on an integrating topology allowing the gain to be controlled by the timing of a clock signal. The recording of physiological signals such as the electroneurogram (ENG) or electromyogram (EMG) is a targeted application. Therefore, low-noise performance and low power consumption are important. Simulated...
This paper addresses the problem of detecting the edge pixels in the grey-level image which based on the maximum fuzzy 2-partition entropy principle. To divide the edge pixels from the image, we use the direction information measures of pixels as the edge characteristic index, and then an entropy function is used to justify if the information of an image is mostly retained after thresholding. In addition,...
The perceptual pre-weighting and post-weighting Multimode Tree Coder is low delay and low complexity. Since the tandem connection of different codecs in voice calls is common today, it is also important to assess any loss in end-to-end speech quality caused by asynchronous tandem coding. We evaluate the tandeming performance of our Multimode Tree Coder when tandemed with itself, with G.727, and with...
In this paper, a two-pass filter is proposed for removing impulse noise to improve image quality. Due to the fact that the edge is more obvious and detected easily, such characteristics of different edges are used to judge whether the pixel is on an edge. Then, the pixels are not on the edges will be filtered by median filter, and further, the other pixels will be detected to preserve original information...
Image filtering is an important problem in image processing. Many algorithms such as adaptive filter, total variation method in this field are efficient and practical. In this paper, the local homogeneity method is employed which result in the homogeneity image (H-image). The high and low values of the H-image correspond to possible region boundaries and region interiors respectively. Finally, an...
In this paper an efficient copyright protection watermarking algorithm is proposed. By embedding orthogonal vector into the wavelet-tree structure of the host image, we get the watermarked image. At the same time human vision system is considered to get perceptual results. We design an elaborate function for blind watermarking scheme. This function can dynamically determine the embedding position...
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