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

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 | Configuration file input

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