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This paper presents an augmented reality gun application named AR-Ghost Hunter. AR-Ghost Hunter is an extension of the traditional first person game which adopts an innovative infrared marker system and portable computer to form a complete mobile AR system. In this system, players are able to fight with virtual ghost through special gun like devices in real environment. The basic issue of the system...
Recently, researches and developments in vehicle safety system has been intensively conducted. In the research field of intelligent transportation systems (ITS), various methods have been made to concern road signs, which can be automatically recognized by driver-support systems. Human characteristics are important factors of traffic accidents. However, research is only focused on the road signs,...
This paper presents a novel liver segmentation method based on the fast marching and graph cuts methods. The algorithm is composed of three main steps: first, rough edge of the liver is extracted from the CT image by fast marching method. Second, hard constrain of the foreground and background which is used for initial calculation of graph cut is obtained by mathematical morphology method. Third,...
In this paper, an algorithm is developed for anatomical structures segmentation based on CT head images. The segmented structure can be used for image guide surgery navigations. In our method, intensity rescaling, the threshold algorithm, region growing method, fast-marching method (FMM) and mathematical morphology are combined and used systematically. Due to the low contrast of the CT images, intensity...
In this paper, we propose a real-time and adaptive method for labeling and recognition of multiple infrared markers. A single-frame based iteration process is developed to obtain the suitable threshold. A sliding window is proposed to propagate the preliminary labels and to reduce the capacity of equivalent tables handling. The labeling and recognition are realized by merging the results of domains...
This paper presents a GPU-based real-time method to correct optical distortions in head-mounted displays (HMDs). The HMD to be corrected is a lightweight and wide field-of-view HMD system with free-form-surface (FFS) prism, in which the image distortion is not rectilinear and centrosymmetric. A special predistortion model is constructed to correct the distortion of the HMD. Although the distortion...
This paper studies the development of a real-time stereo vision system to position multiple infrared markers attached to a surgical instrument. A parallel pipeline algorithm in FPGA is developed to recognize the markers in both image planes and give each of them a unique label; the pipeline architecture includes smoothing filter, thresholding, connected component labeling, and centroid extraction...
The bar code images captured by camera phone have natural disadvantages in the complex environment, such as blur, low contrast, high brightness, etc. Therefore, it is difficult to decode the bar code successfully without preprocessing. Binarization plays an important role in image preprocessing. In this paper, we regarded time complexity and adaptability under the complex environment as a standard...
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