For intelligent transportation surveillance, a novel background model based on Mart wavelet kernel and a background subtraction technique based on binary discrete wavelet transforms were introduced. The background mod...For intelligent transportation surveillance, a novel background model based on Mart wavelet kernel and a background subtraction technique based on binary discrete wavelet transforms were introduced. The background model kept a sample of intensity values for each pixel in the image and used this sample to estimate the probability density function of the pixel intensity. The density function was estimated using a new Marr wavelet kernel density estimation technique. Since this approach was quite general, the model could approximate any distribution for the pixel intensity without any assumptions about the underlying distribution shape. The background and current frame were transformed in the binary discrete wavelet domain, and background subtraction was performed in each sub-band. After obtaining the foreground, shadow was eliminated by an edge detection method. Experimental results show that the proposed method produces good results with much lower computational complexity and effectively extracts the moving objects with accuracy ratio higher than 90%, indicating that the proposed method is an effective algorithm for intelligent transportation system.展开更多
针对船舶横摇运动时序的小样本、非线性、随机性等特点,提出了一种改进支持向量机(improved support vectormachine,ISVM),采用鲁棒损失函数和小波核函数可以有效压制横摇时序的多种噪音和奇异点,具有良好的鲁棒性及泛化能力;引入单松...针对船舶横摇运动时序的小样本、非线性、随机性等特点,提出了一种改进支持向量机(improved support vectormachine,ISVM),采用鲁棒损失函数和小波核函数可以有效压制横摇时序的多种噪音和奇异点,具有良好的鲁棒性及泛化能力;引入单松弛变量使得ISVM具有更简洁的对偶问题及约减的寻优范围,减小了算法运行的时间.建立基于ISVM的船舶横摇运动姿态实时预报模型,对某船横摇运动姿态进行了预报,仿真结果表明该模型是行之有效的.展开更多
基金Project(60772080) supported by the National Natural Science Foundation of ChinaProject(3240120) supported by Tianjin Subway Safety System, Honeywell Limited, China
文摘For intelligent transportation surveillance, a novel background model based on Mart wavelet kernel and a background subtraction technique based on binary discrete wavelet transforms were introduced. The background model kept a sample of intensity values for each pixel in the image and used this sample to estimate the probability density function of the pixel intensity. The density function was estimated using a new Marr wavelet kernel density estimation technique. Since this approach was quite general, the model could approximate any distribution for the pixel intensity without any assumptions about the underlying distribution shape. The background and current frame were transformed in the binary discrete wavelet domain, and background subtraction was performed in each sub-band. After obtaining the foreground, shadow was eliminated by an edge detection method. Experimental results show that the proposed method produces good results with much lower computational complexity and effectively extracts the moving objects with accuracy ratio higher than 90%, indicating that the proposed method is an effective algorithm for intelligent transportation system.
文摘针对船舶横摇运动时序的小样本、非线性、随机性等特点,提出了一种改进支持向量机(improved support vectormachine,ISVM),采用鲁棒损失函数和小波核函数可以有效压制横摇时序的多种噪音和奇异点,具有良好的鲁棒性及泛化能力;引入单松弛变量使得ISVM具有更简洁的对偶问题及约减的寻优范围,减小了算法运行的时间.建立基于ISVM的船舶横摇运动姿态实时预报模型,对某船横摇运动姿态进行了预报,仿真结果表明该模型是行之有效的.
