The invention discloses a filter array, which comprises the following steps: leading the image which is filtered by the filter array CFA to execute DFT, from which a 2-dimensional spectrum id provided, the spectrum makes a periodic repetition on the 2-dimensional space and lead the cycle normalized as (T, T); in an arbitrary circle of the spectrum, comprises a luminance spectrum and at least two chromatic aberration spectrums, wherein the distanced to each center of luminance spectrums are not less than T/2; if all the centers of the spectrums are on the same line, the distance between the center of luminance spectrum and the line is not equal to T/2; if the center coordinate of luminance spectrum is: (x, y), and then existing at least one center coordinate of the chromatic aberration spectrum is none of (x+-T/2, y) or (x, y +-T/2) or (x +-T/2, y +-T/2). The invention correspondingly discloses a method for obtaining a CAF from a frequency field angle and a method for solving inlay of frequency filed reconstruction, adopting the proposal of the invention, can obtain a high quality reconstruction image.