Patent ID: 6690488
Filing Date: 2004-02-10
Classification: H04N

Abstract:
A method of estimating spatial frequency response (SFR) of a digital image acquisition system or device from the images that the system or device produces from input of an original scene, the estimating method comprising the following steps:gathering, from the acquired image or images, data related to the SFR of the digital image acquisition system or device; computing, from said gathered data, a collection of one or more SFR estimates which describe said gathered data, said computing step comprising: grouping the gathered data into one or more data groups; comparing each of said data groups with the response to an ideal (noise-free) signal passed through one or more predetermined system models; selecting a system model for each of said data groups that best corresponds with each of said data groups; and computing an SFR estimate from said selected system model for each of said data groups; and generating, from said collection of SFR estimates and said gathered data, a single overall estimate of the SFR of the digital image acquisition system or device.