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Airborne Light Detection And Ranging (LIDAR) provides accurate height information for objects on the earth, which makes LIDAR become more and more popular in terrain and land surveying. In particular, LIDAR data offer vital and significant features for land-cover classification which is an important task in many application domains. In this paper, an unsupervised approach based on an improved fuzzy...
Traditional level-set-based methods of tracking contours suffered from occlusion and fusion. In this paper, the proposed method introduces dynamic incident detection to find and handle occlusion and fusion. Color histogram of the hue component in HSV color space is used to identify the objects re-entering after occlusion. On the other hand, object features including the size and the motion pattern...
Wetland ecosystems have complex habitat characteristics due to the wetland existing between lands and water bodies, however, satellite remote sensing images have normally mixed pixels because of their spectral characteristics of the riverine surface feature, and it is very difficult to extract the specific information of aquatic ecosystems. Hence satellite remote sensing images are hardly to match...
We present here a prototype of an algorithm for vehicle speed estimation. Different from previous approaches, our algorithm requires no road markers and fewer manual calibrations. Based on specific projection rules, we find a relation between the in-camera coordinate and the real world coordinate. A non-linear regression is employed to estimate the model parameters. This model enables us to estimate...
In order to improve the precision and real-time character of the traditional video-based traffic detector, a novel vehicle detection system based on line scan camera is developed. In this system, the vertical view images of vehicles are captured by two line scan cameras which are mounted on the pole's arm over the roadway; The distance between two cameras is 2 meters along the road. The vehicle's...
In the water conservancy and hydropower engineering, it is very important for the lectotype design of hydraulic turbine to exactly acquire the mathematic description of the engineering curve in order to get the vectorization of all operating mode parameter. We presented a data compression algorithm based on the non-uniform cubic B-spline fitting for ordered data points obtained by the vectorization...
Moving object detection is a very important step in video surveillance. And frame difference algorithms are suitable for these applications. First of all, an automatic threshold calculation method was proposed according to statistic information to obtain moving pixels of video frames. Then moving regions can be formed by morphological operations. At last, the nearest distance of two regions was proposed...
This paper presents a splicing method which is based on the edge detection of SUSAN and artificial fish-swarm algorithm, which solved splicing method about the pictures of seldom characters. Firstly, the images are detected edge by SUSAN algorithm. Secondly, it is removed noise according to the morphological method, and it is blocked by edge. Lastly it obtains the extreme points by artificial fish-swarm...
In this paper, a robust algorithm of digital image watermarking based on discrete wavelet transform is introduced. It adds binary image watermark into gray image and the host image is required for detecting. The algorithm have two characteristics: (1) It is adapted to various gray images owing to using the mean value of selected coefficients. (2) Arnold transform pretreatment eliminates spatial correlation...
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