基于MATLAB的数字散斑条纹图滤波比较

The compassion of filters for digital speckle fringe pattern based on MATLAB

数字散斑照相术提取的数字散斑条纹图存在信噪比低、强度弱的特点,因此需要对图像进行滤波除噪。为了比较不同的滤波方法对散斑条纹图的除噪效果,笔者在MATLAB中采用中值滤波、巴特沃斯低通滤波、指数低通滤波以及同态滤波对提取的条纹图进行处理并就处理结果做出了分析比较。实验结果表明,以上方法都能从噪声中提取信号,其中中值滤波除噪效果最好。

The speckle fringe pattern from the digital speckle photography have the features of low signal-to-noise ratio, and weak intensity, so they need for filtering noise.In order to compare the effect of different filtering methods, we use the median filter, butterworthlow-pass filter, index of low pass filter and homomorphic fdter to remove the noise and comparison of the results.＇Fhe results show that all of these methods can extract weak signal from noise, and the median filter can eliminate the noise more effectively.