Correction of Field Curved Images by the Polynomial Approximation of the Inverse Filtering Function
用多项式近似逆滤波函数实现场曲修正

When an optical transfer function is known,the inverse filtering function can be determined and used for image recovery. If the inverse filtering function is continuous, it can actually be represented as a Taylor polynomial. Hence the recovery of images may be approximately realized in spatial domain by the linear combination of the image and its derivatives rather than by the complex deconvolution. It is considerable for the image recovery of the spatially variant system, such as the correction of field curved images, as the spatial variance only reflects in the coefficients of the linear combination. The recovery equations are derived and the processing results are presented.