Stray Light (Flare) Documentation

Stray Light (Flare) Settings

Current Documentation

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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 | Normalization methods | Light 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

This page provides a list and description of the settings for Imatest stray light source analysis, as well as corresponding INI field-value pairs.

Page Contents

General Settings

Setting

Description

Options / Value type

[straylight] INI field

Memory Mode

How to prioritize memory use vs disk i/o during the analysis.

The default is low memory mode.

 Memory Mode Enumeration

memory_mode

Calculation Settings

Setting

Description

Options / Value type

[straylight] INI field

Calculation

The type of stray light calculation.

The default is Transmission.

Calculation Type Enumeration

calculation

Data Transform

The transform to apply to the metric image(s).

The default is linear (no data transform).

Data Transform Enumeration

data_transform

Dark Level

The dark level in digital numbers. 

The default is 0. If not known, assume 0.

Number (Greater than or equal to 0)

dark_level_dn

Clip To One

Enable to clip the image data to one (instead of zero).

The default is false (clip to zero). 

Note: this control only shows up in the GUI if the Calculation is Attenuation or one of the Logarithmic Data Transforms are used.

Boolean

clip_to_one

Analysis Channel Selection Options

Setting

Description

Options / Value type

[straylight] INI field

Analysis Channel(s)

The channel(s) to analyze.

The default is automatic.

Note: based on the option selected, additional inputs may be required.

Channel Presets Enumeration

channel_type

Luminance Channels

The standard to use for computing a luminance channel.

The default is IEC 61966-2-1.

Note: This option is used only if the Analysis channels are either Luminance or RGB + Luminance.

Luminance Channel Enumeration

channel_lum_type

RGB Order

The ordering of the RGB channels.

The default is RGB.

Note: This option is used only if the Analysis channels are either RGB or RGB + Luminance.

RGB Order Enum

channel_rgb_order

Statistics

The statistics to use.

The default is Mean.

Note: This option is used only if the Analysis channels is Statistics.

Channel Statitics Enumeration

channels_stats_type

Saturation Calculation Options

Setting

Description

Options / Value type

[straylight] INI field

Method

The method for calculating the saturation level.

Saturation Method Enumeration

saturation_method
Bit Depth

The user-provided saturation in bits.

Note: This option is only used if the saturation method is “Specify Bit Depth”.

 Number saturation_user_bit_depth
Value

The user-provided saturation in digital numbers.

Note: This option is only used if the saturation method is “Specify Value”.

 Number saturation_user_value

Normalization Options

Setting

Description

Options / Value type

[straylight] INI field

Normalization Method

The type of normalization to perform.

The default is None.

Note: based on the option selected, additional inputs may be required.

Normalization Method Enumeration

normalization

Level Normalization Options

The following options apply if the normalization method is Level. See the normalization page for a description of the Level normalization method. 

Setting

Description

Options / Value type

[straylight] INI field

Normalization Level

The normalization level in units of digital number (DNs).

The default is 1 (same as None normalization).

Number (greater than 0)

norm_level_value

Direct Reference Image Normalization Options

The following options apply if the normalization method is Direct Reference Image. See the normalization page for a description of the Direct Reference Image normalization method. 

Setting

Description

Options / Value type

[straylight] INI field

Image Filename

The fully-qualified path to the reference image.

Path to a valid image file

norm_refim_filename

Normalization Aggregation 

The methodology for aggregating the masked pixels into a normalization factor.

The default is Median.

Normalization Aggregation Enumeration

norm_refim_aggregation

ND Measurement Type

The type of neutral density (ND) measurement used for the reference image capture.

The default is None.

Neutral Density Measurement Enumeration

norm_refim_comp_nd_type

ND Density Value

The density of the neutral density filter(s) used for the reference image capture. Used if ND Measurement Type is set to ND Density.

The default is 0 (no ND filter used).

Number (greater than or equal to 0, less than or equal to 100)

norm_refim_comp_nd_density_value

ND Transmission Value

The transmission percentage [0-100] of the neutral density filter(s) used for the reference image capture. Used if ND Measurement Type is set to ND Transmission.

The default is 100 (no ND filter used).

Number (greater than 0, less than or equal to 100)

norm_refim_comp_nd_transmission_value

Integration Time Ratio

The ratio of the reference integration time to the analysis integration time (i.e., value for reference image divided by value for analysis image).

The default is 1 (test and reference images have the same integration time).

Number (greater than 0)

norm_refim_comp_int_time_ratio

Gain Ratio

The ratio of the reference gain to the analysis gain (i.e., value for reference image divided by value for analysis image).

The default is 1 (test and reference images have the same gain).

Number (greater than 0)

norm_refim_comp_gain_ratio

Light Level Ratio

The ratio of the reference light level to the analysis light level (i.e., value for reference image divided by value for analysis image).

The default is 1 (test and reference images have the same light level).

Number (greater than 0)

norm_refim_comp_light_level_ratio

 

Lambertian Reference Image Normalization Options

The following options apply if the normalization method is Lambertian Reference Image. See the normalization page for a description of the Lambertian Reference Image normalization method. 

Setting

Description

Options / Value type

[straylight] INI field

Image Filename

The fully-qualified path to the reference image.

Path to a valid image file

norm_lrefim_filename

Normalization Aggregation 

The methodology for aggregating the masked pixels into a normalization factor.

This setting can only be set in the INI.

The default is Median.

Normalization Aggregation Enumeration

norm_lrefim_aggregation
Light Measurement Type

The type of light measurements made.

The default is radiometric.

Note: The choice of this value impacts other measurement inputs.

 Light Measurement Type Enumeration
norm_lrefim_source_meas_type
Radiance from Lambertian Diffuser

The measured radiance from the Lambertian diffuser for the reference image.

Note: this option is only used if the Light Measurement Type is Radiometric.

 Number (greater than 0)
norm_lrefim_ref_radiance
Irradiance at the camera location

The measured irradiance at the camera location for the test image(s).

Note: this option is only used if the Light Measurement Type is Radiometric.

 Number (greater than 0)
norm_lrefim_irradiance
Luminance from Lambertian Diffuser

The measured luminance from the Lambertian diffuser for the reference image.

Note: this option is only used if the Light Measurement Type is Photometric.

 Number (greater than 0)
norm_lrefim_ref_luminance
Illuminance at the camera location

The measured illuminance at the camera location for the test image(s).

Note: this option is only used if the Light Measurement Type is Photometric.

 Number (greater than 0)
norm_lrefim_illuminance

Integration Time Ratio

The ratio of the reference integration time to the analysis integration time (i.e., value for reference image divided by value for analysis image).

The default is 1 (test and reference images have the same integration time).

Number (greater than 0)

norm_lrefim_comp_int_time_ratio

Gain Ratio

The ratio of the reference gain to the analysis gain (i.e., value for reference image divided by value for analysis image).

The default is 1 (test and reference images have the same gain).

Number (greater than 0)

norm_lrefim_comp_gain_ratio

Test Image Mask Options

Setting

Description

Options / Value type

[straylight] INI field

Mask Method

The methodology for masking out the light source in the image(s).

The default is None.

Note: based on the option selected, additional inputs may be required.

Mask Method Enumeration

mask_method

Test Image – Image Processing + Circle (Radius) Mask Options

The following options apply if the masking method is Image Processing + Circle (Radius). Note the Image Processing mask option also applies.

Setting

Description

Options / Value type

[straylight] INI field

Mask Radius

The radius in pixels for the mask.

The default is 10 (this is an arbitrary number and should be updated for each system under test).

Number (greater than 0)

mask_options_radius

Test Image – Image Processing Mask Options

The following options apply if the masking method is Image Processing + Circle (Radius) or Image Processing.

Setting

Description

Options / Value type

[straylight] INI field

Level Threshold Type

The type of threshold used for localizing the light source in the image.

 Level Threshold Type Enumeration

mask_improc_level_thresh_type

Level Threshold (Value)

The threshold above which is considered the image of the light source, in units of digital number (DN).

Number (greater than or equal to 0)

mask_improc_level_threshold

Level Threshold (Percent)

The threshold above which is considered the image of the light source, as a percentage of the maximum image value.

Number (between 0 and 100)

mask_improc_level_threshold_pct

Minimum Source Level

The minimum image value (digital number) that can be considered a direct image of the light source.

Number (greater than or equal to 0)

mask_improc_minimum_source_level

Image Close Radius

The radius of an image close morphology step. This helps to remove holes in the mask. Set to 0 to skip this step.

This setting can only be set in the INI. 

Number (greater than 0)

mask_improc_image_close_radius

Multiple CC Strategy

The strategy for how to deal with multiple connected components when computing the mask.

This setting can only be set in the INI. 

Multiple Connected Component Enumeration

mask_improc_multiple_cc_strategy

Mask Area Threshold

The minimum number of pixels that the direct image of the light source should be (minimum area in pixels for the mask).

Number (greater than 0)

mask_improc_mask_area_threshold

Reference Image Mask Options

Setting

Description

Options / Value type

[straylight] INI field

Mask Method

The methodology for masking out the light source in the reference image(s)

Mask Method Enumeration

refmask_method

Reference Image – Image Processing + Circle (Radius) Options

The following options apply if the masking method is Image Processing + Circle (Radius). Note the Image Processing mask option also applies.

Setting

Description

Options / Value type

[straylight] INI field

Mask Radius

The radius in pixels for the mask.

Number (greater than 0)

refmask_options_radius

Reference Image – Image Processing Mask Options

The following options apply if the masking method is Image Processing + Circle (Radius) or Image Processing.

Setting

Description

Options / Value type

[straylight] INI field

Level Threshold Type

The type of threshold used for localizing the light source in the image.

 Level Threshold Type Enumeration

refmask_improc_level_thresh_type

Level Threshold (Value)

The threshold above which is considered the image of the light source, in units of digital number (DN).

Number (greater than or equal to 0)

refmask_improc_level_threshold

Level Threshold (Percent)

The threshold above which is considered the image of the light source, as a percentage of the maximum image value.

Number (between 0 and 100)

refmask_improc_level_threshold_pct

Minimum Source Level

The minimum image value (digital number) that can be considered a direct image of the light source.

This setting can only be set in the INI. 

Double (greater than or equal to 0)

refmask_improc_minimum_source_level

Image Close Radius

The radius of an image close morphology step. This helps to remove holes in the mask. Set to 0 to skip this step.

This setting can only be set in the INI. 

Number (greater than 0)

refmask_improc_image_close_radius

Multiple CC Strategy

The strategy for how to deal with multiple connected components when computing the mask.

This setting can only be set in the INI. 

Multiple Connected Component Enumeration

refmask_improc_multiple_cc_strategy

Mask Area Threshold

The minimum number of pixels that the direct image of the light source should be (minimum area in pixels for the mask).

This setting can only be set in the INI. 

Number (greater than 0)

refmask_improc_mask_area_threshold

Other Calculation Settings

Setting

Description

Options / Value type

[straylight] INI field

Crop LRTB

The number of pixels to crop off the left, right, top, and bottom of the image.

Number (list of four values greater than or equal to 0)

crop_lrtb

Percentile Ranks

The percentile ranks [0-100] (e.g., 95 = 95th percentile) to calculate.

Number (list of values greater than 0, less than 100)

pctl_ranks100

Level Count Thresholds

The thresholds of stray light level for producing results that show the number of pixels worse than said threshold.

Number (list of values)

level_count_thresh

Level Count Calculation

The calculation (number of pixels, % of pixels in the image) to use for the level count results and plots.

Level Count Calculation Enumeration

count_type

Output Settings

Setting

Description

Options / Value type

[straylight] INI field

Save In Image Folder

Enable to save the result(s) in the same directory as the image file.

If a config file is used this will be the directory the config file is in, otherwise, the directory of the first image will be used.

Boolean

save_in_image_folder

Save Subfolder

The sub-folder of the image folder to save results in. If empty, this will be the same folder as the image.

Note: this is only used when save in image folder is enabled.

Note: inclusion of the following characters may result in failure to save .fits output files (metric images and masks): “(*:<>?[|

String
save_subfolder

Output Directory

The path to the save results to.

Note: this is only used when save in image folder is disabled.

Note: inclusion of the following characters may result in failure to save .fits output files (metric images and masks): “(*:<>?[|

String
custom_save_folder

Result Files

Setting

Description

Options / Value type

[straylight] INI field

Save Summary Results Files

The results files to save.

Result File Format Enumeration

result_files

Save Metric Image Files

Enable to save out a FITS file containing the metric image data for each image.

Boolean

save_metric_image

Save Mask Files

Enable to save out a FITS file containing the binary mask of the source for each image.

Boolean

save_mask

Mask Prefix

A string to be prepended to the mask file(s).

This setting can only be set in the INI. 

String

mask_prefix

Mask Postfix

A string to be appended to the mask file(s).

This setting can only be set in the INI. 

String

mask_postfix

Metric Image Prefix

A string to be prepended to the metric image file(s).

This setting can only be set in the INI. 

String

metric_image_prefix

Metric Image Postfix

A string to be appended to the metric image file(s)

This setting can only be set in the INI. 

String

metric_image_postfix

Level Plot

Note: level plots require two or more test images.

Setting

Description

Options / Value type

[straylight] INI field

Save/Display

How should level summary plot(s) be created?

Choose one or more options.

At least one is required to produce this plot.

Plot Creation Options Enumeration

level_plot_options_mode_options

Image Format(s)

The image formats to save the plot as.

Choose one or more options.

At least one is required to produce this plot.

Plot Save Type Enumeration

level_plot_options_mode_save_types

Groups

How to group the data within a plot. 

Choose one or more options.

At least one is required to produce this plot.

Plot Group Enumeration

level_plot_channel_grouping

Y Data

The data to plot on level summary plot(s).

Choose one or more options.

At least one is required to produce this plot.

Level Plot Data Enumeration

level_plot_include_named_data

Include Percentiles

Enable to include percentiles on the level summary plot(s).

Boolean

level_plot_include_pctls

Y-Axis Scale

The scaling of the y-axis of the plot.

Axis Scaling Enumeration

level_plot_y_axis_scale

Count plot

Note: count plots require two or more test images.

Setting

Description

Options / Value type

[straylight] INI field

Save/Display

How should level summary plot(s) be created?

Choose one or more options.

At least one is required to produce this plot.

Plot Creation Options Enumeration

count_plot_save_display

Channel Grouping

How to group the data within a plot. 

Choose one or more options.

At least one is required to produce this plot.

Plot Group Enumeration

count_plot_channel_grouping

Y Data

The data to plot on count summary plot(s).

Choose one or more options.

At least one is required to produce this plot.

Count Plot Data Enumeration

count_plot_include_named_data

Include Level Counts

Enable to include level counts on the count summary plot(s), corresponding to the value(s) entered for the Level Count Threshold option.

Boolean

count_plot_include_level_counts

Y-Axis Scale

The scaling of the y-axis of the plot.

Axis Scaling Enumeration

count_plot_options_y_axis_scale

Summary Videos

Colormapped Metric Video

Setting

Description

Options / Value type

[straylight] INI field

Video Formats

The formats to save the metric image video as. Note: MP4 is not available on Linux.

Video Save Format Enumeration

metric_video_video_formats

Image Formats:

The image formats to save each frame of the metric image video as.

Image Frame Format Enum

metric_video_image_formats

Video Frame Rate

The framerate in frames per second for the metric video.

Number (greater than 0, less than 40)

metric_video_frame_rate

Colormapped Image Transform

How to scale the data before making the summary metric plot(s).

Note this only applies if the Data Transform is linear.

Video Frame Scaling Enumeration

metric_video_linear_output_scale

Metric Image Histogram

Setting

Description

Options / Value type

[straylight] INI field

Video Formats

The formats to save the histogram image video as.

Note: MP4 is not available on Linux.

Video Save Format Enumeration

hist_video_video_formats

Image Formats

The image formats to save each frame of the histogram video as.

Image Frame Format Enum

hist_video_image_formats

Video Frame Rate

The framerate in frames per second for the histogram video.

Number (greater than 0, less than 40)

hist_video_frame_rate
Y-Max Type How to scale the maximum of the y-axis of histograms. Histogram Y-Max Enumeration
hist_video_ymax_type
Y-Max Value The user-provided maximum value for the y-axis of histograms. A first-order value for this value is the number of pixels in the image. Integer (greater than 0)
hist_video_ymax_value

Miscellaneous

Setting

Description

Options / Value type

[straylight] INI field

Frame-to-frame Scaling

How to scale the frames of the video relative to each other.

Video Frame Scaling Enumeration

frame_scaling

Video Output Scale

How to scale the data before making the video(s).

Data Scaling Enumeration 

video_output_scale
       
       
       

Enumerations

Channel Selection Enumerations

Channel Presets Enumeration

Description

The channels to analyze. 

Members

Name Description Value
Automatic

Automatically choose which channels to analyze based on the image data.

If a one channel image provided, it will be analyzed as Monochrome, otherwise Each Channel will be used.

Notes:

  • This can be used on images with any number of channels
 0
Each Channel

Analyze each channel.

Notes:

  • This can be used on images with any number of channels
  • Results will be labeled Channel 1, Channel 2, …
 1
RGB

Analyze a three-channel image as Red, Green, and Blue.

Notes:

  • This can only be used with three-channel image data
  • Results will be labeled Red, Green, Blue
 2
Monochrome

Analyze a one-channel image as monochrome.

Notes:

  • This can only be used with single-channel image data
 3
Statistics

Analyze the statistics (mean, meadian) of all provided channels.

Notes:

  • This can be used on images with any number of channels
  • Pre-24.2, this was mean.
 4
Luminance

Analyze the luminance channel computed from a three-channel image.

Notes:

  • This can only be used with three-channel image data
 5
RGB + Luminance

Analyze the Red, Green, and Blue plus the computed luminance channels.

Notes:

  • This can only be used with three-channel image data
 6

Luminance Channel Enumeration

Description

The standard to use for computing a luminance channel. 

Members

Name Description Value
IEC 61966-2-1

Use IEC 61966-2-1 weights (0.2126, 0.7152, 0.0722) to compute a luminance channel.

 1
ITU-R BT.601-7

Use ITU-R BT.601-7 weights (0.299, 0.587, 0.114) to compute a luminance channel. 

 2
ITU-R BT.709-6

Use ITU-R BT.709-6 weights (0.2126, 0.7152, 0.0722) to compute a luminance channel.

 3
ITU-R BT.2020-2

Use ITU-R BT.2020 (0.2627, 0.6780, 0.0593) weights to compute a luminance channel.

 4
MATLAB

Uses MATLAB’s rgb2gray to compute a luminance channel.

 6

RGB Order

Description

The ordering of the red, green, and blue data within an image

Members

Name Description Value
RGB
The image data is ordered red, green, blue.
 0
BGR
The image data is ordered blue, green, red.
 1

Channel Statistics

Description

The standard to use for computing a luminance channel. 

Members

Name Description Value
Mean

Analyze the mean of the provided channels.

 0
Median

Analyze the median of the provided channels.

 1

Single Choice Enumerations

For the following enumerations, choose one of the provided options.

Axis Scaling Enumeration

Description

How to scale the axis of a plot.

Members

Name Description Value
Linear

The axis uses a linear scale.

 0
Log

The axis uses a log scale.

 1

Calculation Type Enumeration

Description

The type of stray light calculation to perform.

Members

Name Description Value
Transmission

The calculation is the image divided by the normalization factor.

 0
Attenuation

The calculation is the normalization factor divided by the image.

Note: 0 is a valid digital number for image data. If choosing attenuation, any image with 0’s in it will get infinity for the calculated stray light. Summary statistics (e.g., mean, max) of data containing infinity become meaningless. Therefore it is recommended to enable Crop To One if this option is chosen.

 1

Data Transform Enumeration

Description

How to transform data.

Members

Name Description Value
Linear

Apply no transform to the data \(y=x\).

 0
Log 10

Apply a base-10 logarithm to the data \(y=log_{10}(x)\).

 1
dB Power

Convert the data to power decibels \(y=10\cdot log_{10}(x)\).

 2
dB Voltage

Convert the data to voltage decibels \(y=20\cdot log_{10}(x)\).

 3
Log 2

Apply a base-2 logarithm to the data \(y=log_{2}(x)\).

 4
Natural Log

Apply a natural logarithm to the data \(y=ln(x)\).

 5

Notes

Note: 0 is a valid digital number for image data. The log (any base) of zero is undefined, although computed to negative infinity. Summary statistics (e.g., mean, max) of data containing infinity become meaningless. Therefore it is recommended to enable Crop To One if any of the logarithmic data transform options is chosen.

Histogram Y-Max Type Enumeration

Description

How to set the maximum y-value in a histogram plot

Members

Name Description Value
Automatic

Automatically scale for each frame.

 1
User-defined

Use a constant, user-defined maximum value.

 2

 

Image Processing Masking Level Type Enumeration

Description

The type of threshold used for localizing the light source in the image.

Members

Name Description Value
Value

The threshold in digital numbers.

 0
Percentage of Max

The threshold is a percentage of the maximum value [0-100].

 1
Otsu’s Method

Use Otsu’s method to automatically determine a threshold. 

2

Image Processing Masking Mulitple Connected Component Enumeration

Description

The strategy for how to deal with multiple connected components when computing the mask.

Members

Name Description Value
Don’t Mask

If multiple CCs are found, assume the source is not in the image.

 1
Pick Biggest

Pick the largest of the connected components.

 2

Level Count Calculation Enumeration

Description

The calculation to make for count-based summary metrics.

Members

Name Description Value
Number of Pixels

The results will use the number of pixels in the image that match the criteria

 1
Percent of Pixels

The results will use the percent of pixels in the image that match the criteria.

 2

Light Measurement Type Enumeration

Description

The type (radiometric/photometric) of light level measurement that was made.

Members

Name Description Value
Radiometric

Radiometric light level measurements are made (e.g., radiance, irradiance).

 0
Photometric

Photometric light level measurements are made (e.g., luminance, illuminance).

 1

Mask Method Enumeration

Description

The methodology for masking out the light source in the image(s).

Members

Name Description Value
None

Don’t mask the source.

Note: this is not available for masking reference images.

 0
Image Processing

Use image processing to mask the source.

 10
Image Processing + Circle (Radius) Find the center via the first step of Image Processing masking and then use a circle to mask. The light source is first localized in the image via image processing-based methods. Then, a circle of a specified radius is placed at the center of the localized region and is used as the mask for the image 13

Memory Mode Enumeration

Description

How to prioritize memory or disk i/o during the stray light analysis.

Members

Name Description Value
High Memory

Keep everything in memory during the analysis.

Note: This is the pre-24.2 behavior.

 1
Low Memory

Keep limited information in memory during the analysis. Metric image outputs will be read back in as needed during the analysis.

Note: If saving color-mapped metric images and/or histograms, save metric images must be enabled.

Note: this is not available for trials.

 2

Normalization Aggregation Enumeration

Description

The methodology for aggregating the masked pixels into a normalization factor.

Members

Name Description Value
Mean

Use the mean inside the masked pixels as the base normalization factor.

 0
Median

Use the median inside the masked pixels as the base normalization factor.

 1
Total

Use the total (sum) inside the masked pixels as the base normalization factor.

 2

Normalization Method Enumeration

Description

The type of normalization to perform.

Members

Name Description Value
None

Perform no normalization. Results will be in digital numbers.

 0
Level Normalize with a user-provided source level in units of digital number (DN). Using this option requires the Level normalization settings. 1
Direct Reference Image Normalize by the level of the direct image of the source from a reference image. This normalization method corresponds to the Point Source Rejection Ratio (PSRR) or Extended Source Rejection Ratio (ESRR). Using this option requires the Direct Reference Image normalization settings. 3
Lambertian Reference Image Normalize by the level of an image of the source as viewed through a Lambertian diffuser. This normalization method corresponds to the Flare Attenuation method in IEEE-P2020 Pre-Release. Using this option requires the Lambertian Reference Image Normalization settings. 4

Neutral Density Measurement Enumeration

Description

The type of neutral density measurement used for the reference image capture.

Members

Name Description Value
None

No ND filter is used for the reference image.

 0
Density

ND filter(s) are used. The value is the total density of filters.

 1
Transmission ND filter(s) are used. The value is the total transmission as a percentage [0-100] of the filters. 2

Saturation Calculation Enumeration

Description

The saturation calculation method.

Members

Name Description Value
Container Max Use the maximum value of the container. 0
Image Max Use the maximum value of the image. 1
Image Max (Power of Two) Use the maximum value of the image, rounded up to 2N-1. 2
Image Max (Even Power of Two) Use the maximum value of the image, rounded up to 22N-1. 3
Specify Bit Depth Specify the saturation level in bits. 4
Specify Value Specify the saturation level in digital numbers. 5

Video Frame Scaling Enumeration

Description

How to scale the frames of a video relative to each other.

Members

Name Description Value
Global

All frames have the same scaling.

 0
Per-Subset

All frames of the same subset (channel) have the same scaling.

 1
Per-Image

Each frame of the video will have its own scale.

 2

Multiple Choice Enumerations

For the following enumerations, choose any of the provided options. The value in the INI is the sum of desired options.

Results File Type Enumeration

Description

The type(s) of summary results file to save.

Members

Name Description Value
JSON

Save a JSON-formated results file.

 1
CSV

Save a CSV-formatted results file.

 2
HDF5

Save an HDF5-formatted results file.

 4

Plot Creation Enumeration

Description

Select how to create (display, save) plot(s).

Members

Name Description Value
Save

Save plot(s) to disk.

 1
Display

Display plot(s) to screen.

 2

Plot Save Type Enumeration

Description

The image formats to save the plot as.

Members

Name Description Value

JPEG 24-bit (.jpg)

   1

PNG 24-bit (.png)

   2

TIFF 24-bit [compressed] (.tif)

 

4

TIFF 24-bit [not compressed] (.tif)

 

 8

BMP 8-bit [256 color, uses a fixed colormap] (.bmp)

This will be deprecated in a future release.

 16

HDF 24-bit (.hdf)

This will be deprecated in a future release.

 32

PBM 1-bit (.pbm)

This will be deprecated in a future release.

 64

PCX 24-bit color [three 8-bit planes] (.pcx)

This will be deprecated in a future release.

 128

PGM (.pgm)

This will be deprecated in a future release.

 256

PPM (.ppm)

This will be deprecated in a future release.

 512

Full page Portable Document Format [PDF] color (.pdf)

 

 1024

Encapsulated PostScript [EPS] Level 2 color (.eps)

 

 2048

SVG [scalable vector graphics] (.svg)

 

 4096

Full-page PostScript [PS] Level 2 color (.ps)

 

 8192
MATLAB Figure (.fig)

 

 16384

Deprecation Warning

Some options will be deprecated in a future Imatest release.

Plot Grouping Enumeration

Description

How to group the data within a plot. At least one is required to produce this plot.

Members

Name Description Value

All

 All channels will be in the same plot. 1
By Channel A separate plot will be made for each channel. 2

Level Plot Data Enumeration

Description

The data to plot on level summary plot(s).

Members

Name Description Value

Minimum

   1

Minimum (Non-0)

 Minimum of the non-0 data in the original image. 2

Maximum

 

4

Mean

 

 8

Median

 

 16

RMS

Root Mean Square

 32

Std. Dev.

Standard Deviation

 64

Count Plot Data Enumeration

Description

The data to plot on count summary plot(s).

Members

Name Description Value

Total Count

 The number/count of pixels in the region of interest (note: currently, only the total number of pixels in the image is available). 1

Source Count

 The number/count of pixels in the masked region (the light source object). 2

Saturation Count

 The number/count of pixels at or above the calculated saturation level. 4

Video Save Type Enumeration

Description

The formats to save a video as.

Members

Name Description Value

MP4

 Note: Not available on Linux 1

AVI

  

2

GIF

  

4

Image Frame Save Formats

Description

The image formats to save each frame of a video as.

Members

Name Description Value

PNG

   1

JPEG

   2

TIFF

   4

History

24.2 Changes

 

INI Syntax Updates

  • Arrays are now comma-separated and contained within square brackets
    • crop_lrtb
    • pctl_ranks100
    • level_count_thresh
    • plot_save_types
  • Strings are now contained within double quote
    • norm_refim_filename
    • norm_lrefim_filename

INI Key Updates

The following INI keys have been updated

Old INI Key New INI Key(s)
channels channel_type
count_per_plot_scaling count_plot_per_plot_scaling
count_plot_options_groups count_plot_channel_grouping
count_plot_options_include_level_counts count_plot_include_level_counts
count_plot_options_mode_options count_plot_save_display
count_plot_options_mode_save_types plot_save_type
count_plot_options_y_data count_plot_include_named_data
count_plot_yaxisscale count_plot_y_axis_scale
hist_video_opts_frame_rate hist_video_frame_rate
hist_video_opts_image_formats hist_video_image_formats
hist_video_opts_video_formats hist_video_video_formats
level_plot_options_groups level_plot_channel_grouping
level_plot_options_include_pctls level_plot_include_pctls
level_plot_options_mode_options level_save_display
level_plot_options_mode_save_types plot_save_type
level_plot_options_y_axis_scale level_plot_y_axis_scale
level_plot_options_y_data level_plot_include_named_data
lum_type channel_lum_type
metric_video_opts_frame_rate metric_video_frame_rate
metric_video_opts_image_formats metric_video_image_formats
metric_video_opts_video_formats metric_video_video_formats
output_dir save_in_image_folder, custom_save_folder, save_subfolder
pctl_ranks100 percentile_ranks100
plot_output_scale metric_video_linear_output_scale
result_files result_save_types
rgb_order channel_rgb_order

 

The following INI keys have been deprecated

  • mask_postfix
  • mask_prefix
  • metric_image_postfix
  • metric_image_prefix
  • metric_video_opts_basename
  • hist_video_opts_basename
  • video_prefix
  • video_postfix
  • video_output_scale

Plot Save Format Updates

Save Format Old INI Value New INI Value
<None> 0 []
JPEG 1 1
PNG 2 2
TIFF (uncompressed) 4 3
TIFF (compressed 8 4
BMP 16 Deprecated
HDF 32 Deprecated
PBM 64 Deprecated
PCX 128 Deprecated
PGM 256 Deprecated
PPM 512 Deprecated
PDF 1024 6
EPS 2048 7
SVG 4096 11
PS 8192 Deprecated
MATLAB FIG 16384 5

Python INI Migrator

To help with migrating the stray light portion of your INI to 24.2, a python migration utility is provided with Imatest 24.2.

The python code for imatest_straylight_24_2_ini_migrator comes already installed as a Python package in the Python interpreter that is included in the Imatest Master or IT installation (see <Imatest Master/IT root>/bin/python39). The relevant Python function has the following interface

def migrate_ini(filename: str) -> None

and can be invoked in this interpreter with 

from imatest_straylight_24_2_ini_migrator.imatest_straylight_24_2_ini_migrator.py import migrate_ini
migrate_ini("/some/folder/imatest-v2.ini")

In addition to the Python code, there is also a standalone executable (located at <Imatest Master/IT root>/bin/python39/bin for macOS and Linux and <Imatest Master/IT root>/bin/python39/Scriptsfor Windows) named imatest-straylight-24-2-ini-migrator. The application’s interface is as follows:

$ imatest-straylight-24-2-ini-migrator.exe --help
usage: imatest-straylight-24-2-ini-migrator [-h] filename
Migrate the stray light section of an Imatest INI file from 24.1 to 24.2.
positional arguments:
  filename The path to the INI file. The default INI location is `C:\Users\Ty\AppData\Roaming\Imatest\imatest-v2.ini`.
optional arguments:
  -h, --help show this help message and exit

, which can be invoked with a call such as

imatest-straylight-24-2-ini-migrator "/some/folder/imatest-v2.ini"