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1. (WO2018128896) IMAGE NOISE REDUCTION USING SPECTRAL TRANSFORMS

Pub. No.:    WO/2018/128896    International Application No.:    PCT/US2017/068596
Publication Date: Fri Jul 13 01:59:59 CEST 2018 International Filing Date: Thu Dec 28 00:59:59 CET 2017
IPC: G06T 5/00
G06T 5/10
G06T 5/50
H04N 5/357
Applicants: FLIR SYSTEMS, INC.
Inventors: HOGASTEN, Nicholas
Title: IMAGE NOISE REDUCTION USING SPECTRAL TRANSFORMS
Abstract:
Various techniques are provided for reducing noise in captured image frames. In one example, a method includes determining row values for image frames comprising scene information and noise information. The method also includes performing first spectral transforms in a first domain on corresponding subsets of the row values to determine first spectral coefficients. The method also includes performing second spectral transforms in a second domain on corresponding subsets of the first spectral coefficients to determine second spectral coefficients. The method also includes selectively adjusting the second spectral coefficients. The method also includes determining row correction terms based on the adjusted second spectral coefficients to reduce the noise information of the image frames. Additional methods and systems are also provided.