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Stray light (flare) documentation pages

Introduction: Intro to stray light testing and normalized stray lightOutputs from Imatest stray light analysis | History

Background: Examples of stray lightRoot Causes | Test overview | Test factors | Test ConsiderationsGlossary

Calculations: Metric image | Normalization methodsLight source mask methods | Summary Metrics | Analysis Channels | Saturation

Instructions: High-level Imatest analysis instructions (Master and IT) | Computing normalized stray light with Imatest | Motorized Gimbal instructions

Settings: Settings list and INI keys/values | Standards and Recommendations | Configuration file input

Page Contents

This page provides definitions for stray light terminology.

Definitions

TermDefinitionNotes
Direct PathThe designed path for light to go through the optics.This is not stray light as without this path, it would be impossible to form an image.

See also: Stray Light Path(s)
FlareAny light that reaches the detector (i.e., the image sensor) other than through the designed optical path.
  • Synonym: Stray Light
  • Definition from IEEE-P2020
Stray LightAny light that reaches the detector (i.e., the image sensor) other than through the designed optical path.
  • Synonym: Flare
  • Definition from IEEE-P2020
Stray Light Path(s)The non-design path(s) light takes through the optics to produce stray light.See also: Direct Path

Acronyms

AbbreviationDefinitionDescription
DUTDevice Under TestThe camera that is being tested.
ESRRExtended Source Rejection RatioA stray light metric where the image data is normalized by the expected signal from an on-axis light point source.
FITSFlexible Image Transport SystemA file format for storing multi-demensional data.
More info.
GSFGlare Spread FunctionA lens only stray light metric. Defined in ISO 9358:1994.
HDF5Hierarchical Data Format 5A file format for storing and organizing large amounts of data.
More info.
PSRRPoint Source Rejection RatioA stray light metric where the image data is normalized by the expected signal from an on-axis light point source.
PSTPoint Source TransmissionA stray light metric that normalizes radiometrically calibrated data by the irradiance at the front of the DUT.