Method and a device for reducing image noises

Details Method and a device for reducing image noises Method and a device for reducing image noises

2006-02-23

2009-06-30

Bella, Matthew C (Department: 2624)

Image analysis

Image enhancement or restoration

C342S196000, C386S349000, C386S349000, C386S349000

Reexamination Certificate

active

07555169

ABSTRACT:
An image noise reduction method in frequency domain is provided, comprising selecting a first image and applying a Fourier transform thereon to acquire a first frequency spectrum, wherein each pixel of the first frequency spectrum has a real part X and a imaginary part Y, calculating a first energy of each pixel and a first mean energy of all first energies of the pixels, calculating a first mean value and a first standard deviation of the real part of the pixels, calculating a second mean value and a second standard deviation of the imaginary part of the pixels, determining a first and a second predetermined values, when the first energy exceeds the first mean energy, the first and second predetermined value are replaced with X and Y, and when the first energy does not exceed the first mean energy, X and the Y are reserved.

REFERENCES:
patent: 2006/0222192 (2006-10-01), Matthey
patent: 2007/0242884 (2007-10-01), Dugan et al.

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