一种基于小波包变换和中值滤波的球团矿图像去噪方法

在球团矿粒度在线检测系统中，球团图像采集过程的干扰噪声主要是脉冲噪声和白噪声。中值滤波对脉冲噪声有较好的滤波效果，对于白噪声降噪效果较差；小波包技术可以很好的消除白噪声，但对脉冲噪声滤波效果不理想。提出了一种将小波包变换和中值滤波相结合的球团矿图像去噪方法。实验表明，这种综合方法具有良好的消噪效果，满足球团矿图像后续更高层次处理的要求。

Image-denoising method based on wavelet packet transform and median filter

In the system of the online measuring of pellets diameters, the disturbed noises during the process of collecting pellets images are mainly impulse noise and white noise, The median filter may eliminate impulse noise but not white noise; the technology of wavelet pucket can primarily eliminate the white noise but not impulse noise. An image denosing method which combine wavelet packet transform with median filter used in the system of the online measuring of pellets diameters was presented. The experiment results show that the method is effective on denoising and satisfying with the requirement of pellets images in the following high level treatment.