Wenjun Tan

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In this paper, we address the problem of dynamic hand gesture recognition from unaided video sequences. We present a novel approach based on motion trajectories of hands and hand shapes of the key frames. Firstly, the hand area is segmented by active skin color model. Then the hand motion trajectories are extracted with dynamic time warping(DTW) algorithm(More)
The increasingly wide range of applications of robot in production and living makes robots education imperative. In this paper, the "fire-fighting robots" is designed and implemented as a demonstration of robot technology education system using LEGO components. It shows the robot technology and popularizes robot related knowledge and provides a new platform(More)
Shape representation is a very important issue in computer vision and pattern recognition. This paper presents a novel shape representation algorithm based on equilateral polygonal approximation. Firstly, the problem and definition of equilateral polygonal approximation are presented in this paper. Then a new equilateral polygonal approximation method based(More)
Aim at the faults of the traditional background difference method based on Bayes Rule when detects motion hand gestures, such as the existence of interference regions, slow computing speed and so on. A method of dynamic hand gesture detection based on local background updates and skin color model is proposed in this paper. The skin color region in a single(More)
Scene classification is an important application field of multimedia information technology, whereas how to extract features from image is one of the key technologies in scene classification and recognition. A new method of extracting features is presented in this paper, it extracts features through gray level-gradient co-occurrence matrix in the(More)
In this paper, a novel fully automatic method of extraction of lung parenchyma is presented. Combining the iterative gray-level thresholds selection and the pulmonary regions extraction with error detection in 2D image, seed points and threshold are fast determined. In consequence, the pulmonary airspace is detected with 3D region growing method. Two steps(More)
The hand gesture is the most common and natural way for human daily interaction. In this paper, we propose a novel approach to hand extraction based on active skin color model. The skin color model is first built by the non-linear transformation in YCbCr color space. Then the obtained model is applied to hand segmentation. Hand feature is extracted by(More)
For hippocampus of MRI demonstrating the low contrast, low signal to noise ratio(SNR), boundary discrete, intensity in homogeneities features, this paper proposed an improved level set model that based on regional and edge information. Refer to the intensity in homogeneities image, the global image information of external energy item is joined, to optimize(More)
The robotic technology is one of the hottest topic. With the increasingly wide range of applications in people¿s daily life, popularizing knowledge of robotic technology has become an important content of popular science. This paper researches autonomous navigation, visual identification, man-machine interaction and so on. According this, the robotic(More)