Patent · US Expired

Process and apparatus for automatically determining the modulation transfer function of focal plane array cameras

US6876443B2 · kind B2 · utility

2Cited by

5References

5Claims

0Family size

Assignee

LFK-LENKFLUGKOERPERSYSTEME GMBH · DE

Inventors

Jochen Barth · Oberschleißheim, DE
Michael Assel · Kissing, DE
Yvonne Polin · Weil der Stadt, DE

Key dates

Filing date	Oct 31, 2002
Grant date	Apr 5, 2005
Priority date	—
Expiry date	Aug 20, 2023

Classification

Technology area (CPC G)Physics
CPC primaryG01M11/0292
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

In a process for automatically determining the modulation transfer function (MTF) of a focal plane array (FPA) cameras, a test grid is used to generate a beat whose amplitude corresponds to that of the grid image to be measured, without the sampling MTF. (The image of the test grid has a spatial frequency in the detector plane that is detuned with respect to the Nyquist frequency of the detector array. The test grid covers a range of at least half a beat period, and then, regardless of the actual phase position, the modulation amplitude is determined therefrom. Comparative MTF measurements are thereby permitted without the influence of the sampling effect of an FPA, and particularly the MTF measurement in real time suitable for the application to moving images.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.