含噪声模糊图像的点扩展函数参数辨识

针对运动模糊和散焦模糊，提出了一种基于双谱的对含有噪声的模糊图像点扩展函数参数辨识的方法。首先计算出一幅标准测试图像经模糊后的双谱，之后通过曲线拟合出双谱中的统计特性与模糊尺度之间的函数关系，由此训练出的BP神经网络可以完成对其它含有噪声的模糊图像的点扩展函数的参数辨识。实验结果表明，本方法适用于含有噪声的一定模糊参数范围内的散焦模糊和运动模糊图像，在信噪比为25dB的情况下，辨别出模糊尺度的偏差不超过0.5个像素。

Parameter identification of point spread function in noisy and blur images

In consideration of the motion blur and defocus blur of images, a robust bispectrum-based method is proposed to estimate the blurred parameters in noisy images. Firstly, the bispectrum of a blurred standard test image is calculated. Then,the curve fitting is used to obtain the functional relationship between the statistical characteristics in bispectrum and the degraded parameters. Finally, the BP neural network trained by the above mentioned functional relations can identify the parameters in point spread ...