In image processing pre-processing is used for preparing or improving performance of operations. In order to improve performance of extraction algorithms in Discrete Cosine Transform (DCT) based watermarking method, a new prefiltering method is proposed in this paper. Enhancement filters are applied to the watermarked image as pre-filtering before running watermark extraction algorithms in DCT ...

The mean-shift algorithm is an efficient technique for tracking 2D blobs through an image. Although the scale of the mean-shift kernel is a crucial parameter, there is presently no clean mechanism for choosing this scale or updating it while tracking blobs that are changing in size. In this paper, we adapt Lindeberg’s theory of feature scale selection based on local maxima of differential scale...

In this paper we propose an offline method for refining audio-to-score alignment at the note level in the context of orchestral recordings. State-of-the-art score alignment systems estimate note onsets with a low time resolution, and without detecting note offsets. For applications such as score-informed source separation we need a precise alignment at note level. Thus, we propose a novel metho...

This paper describes a new approach for tracking circular traffic signs from image sequences. As a part of traffic sign recognition system, the traffic sign tracking will improve the performance of the recognition. By tracking the signs, search space is reduced and misdetection caused by temporal occlusion could be avoided. We propose a new blob tracking called two-layer blob tracking to track ...

In this paper we present a sharpening operator for color images that is based on perceptual considerations about how human visual behaves for color scenes. Color contrast is an induction phenomenon of the visual system that varies the chromaticity of a color region depending on the color of its surround, provoking an enhanced perception of color scenes. This effect can be simulated by a sharpen...

Two-dimension gel electrophoresis (2-DE) is a proteomic technique that allows the analysis of protein profiles expressed in a given cell, tissue or biological system at a given time. The 2-DE images depict protein as spots of various intensities and sizes. Due to the presence of noise, the inhomogeneous background, and the overlap between the spots in 2-DE image, the protein spot detection is n...

Bladder cancer is reported to be the fifth leading cause of cancer deaths in the United States. Recent advances in medical imaging technologies, such as magnetic resonance (MR) imaging, make virtual cystoscopy a potential alternative with advantages as being a safe and non-invasive method for evaluation of the entire bladder and detection of abnormalities. To help reducing the interpretation ti...

State of the art methods for image matching, content-based retrieval and recognition use local features. Most of these still exploit only the luminance information for detection. The color saliency boosting algorithm has provided an efficient method to exploit the saliency of color edges based on information theory. However, during the design of this algorithm, some issues were not addressed in...

A system is presented which provides head tracking services that can be implemented into 3D games and simulations. This creates an enhanced illusion of depth based on the real world position of the user and gives the ability to look around the virtual world by physically turning your head. A webcam is used to capture images of a layout of three red dots attached to a hat worn by the user. These...

Electrophysiology procedures are commonly carried out under guidance of C-arm fluoroscopy, but precise localization of the surgical instruments within the patients anatomy is done using expensive electro-anatomic mapping systems • Potential Alternative: Optical catheter detection, tracking & 3D reconstruction in fluoroscopic X-ray images • State of the Art: i) Gaussian blob detectors[3,4] for d...