Stray light (flare) documentation pages
Introduction: Intro to stray light testing and normalized stray light | Outputs from Imatest stray light analysis | History
Background: Examples of stray light | Root Causes | Test overview | Test factors | Test Considerations | Glossary
Calculations: Metric image calculations | Normalization methods | Light source mask methods | Summary Metrics | Analysis Channels
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
23.2
Standards
- Adds support for IEEE-P2020 Pre-Release Flare Attenuation
Normalization
- Adds Lambertian Diffuser Normalization for IEEE-P2020 Pre-Release Flare Attenuation
Calculations
- Adds the ability to select the analysis channel(s)
- Adds the ability to select a transformation (log, dB, etc.) of the stray light data
- Adds the ability to subtract off a dark level
- Adds the minimum measurable stray light to the result files
- Adds the ability to express count plots/metrics in terms of percent of pixels
- Adds improved visual separation of masked pixels in color-mapped metric images
Nomenclature
- Renames “Reference Image” Normalization to “Direct Reference Image“
- Renames “Two Pass Circle Radius” Masking to “Image Processing + Circle (Radius)“
Miscellaneous
- Adds the ability to reload settings from the INI
Future Changes
- Some line plot image formats will be removed in future releases
23.1
Light Source Masking
- Separates masking settings for the reference image and test images
- Adds the ability to use the Image Processing masking method
- Adds the ability to use no masking (test images only)
- Adds minimum stray light level threshold to Image Processing-based source masking to improve masking when the source is out of the FOV
- Adds the ability to use Otsu’s method to determine the light source threshold for Image Processing masking
Normalization
- Adds normalization with user-provided level
- Adds integration time, light level, and gain compensation factors for the Reference Image normalization
Analysis
- Adds count results: number of pixels with stray light worse than user-provided thresholds
Nomenclature
- Renames “On-Axis” normalization to “Reference Image“
- Renames calculation methods:
- Normal → Transmission
- Reciprocal → Attenuation
Results
- Adds tabs (extra commas) in CSV outputs to delineate sections
22.2
- Initial stray light offering