Settings
This page describes the OGI settings.
Brightness: Adjusts the brightness of the images. Higher values result in a lighter image.
Min: 0 Max: 255 Default: 128
Contrast: Adjusts image contrast. Higher values result in more contrast.
Min: 0 Max: 255 Default: 128
Sharpen: Adjusts the edge sharpening filter to bring out edges within an image. Higher values increase the sharpening effect.
Min: 0 Max: 15 Default: 0
Denoise: This averages the image over time with image-to-image registration to dampen possible disruptive visual effects such as heat shimmer, scintillation, and turbulence.
Min: 0 Max: 255 Default: 0
AGC ROI: Adjusts the region of interest (ROI) when performing automatic gain corrections. This percentage controls the percentage of the frame used for AGC. The default performs AGC on the entire frame.
Min: 0 Max: 100 Default: 100
Manual AGC: This option freezes the current AGC settings.
Options:
On
Off
Default: Off
Gas Detection: This setting controls gas enhancement mode (GEM), which enhances and colorizes gas detectable by the OGI sensor.
Options:
On
Off
Default: Off
Stabilization Mode: Enables digital stabilization.
Options:
On
Off
Default: Off
Enhancement Mode: Two different contrast enhancement modes are available: CLAHE and LAP. Once an enhancement mode is selected, additional settings can be configured to configure it. Contrast Limited Adaptive Histogram Equalization (CLAHE) brings out hard-to-see (low contrast) features in the video, including those with brighter and darker areas.
Local Area Processing (LAP) brings out hard-to-see (low-contrast) features. LAP emphasizes differences from the local image average to provide an increased amount of detail in low-contrast areas of a video or image. The algorithm makes details visible in underexposed or overexposed portions of the image.
Strength:
In CLAHE, the Strength parameter controls the contrast limit. A larger value allows the algorithm to map a larger contrast but can also tend to bring out more noise.
In LAP, the Strength parameter controls the kernel size used in the processing. A larger value provides more enhancement. Values are between 0 (minimal enhancement) and 18 (maximum enhancement). For LAP mode, there are no additional enhancement benefits after 18.
Min: 0 Max: 128 Default: 0
Alpha Blend: This allows mixing (alpha blending) the output of the enhancement algorithm with the input to the Enhance Stage. This allows a user to soften the effects of the contrast enhancement stage. Higher values blend more of the enhanced image, while lower values use less of it.
Min: 0 Max: 1.0 Default: 0.8
NUC Table: The OGI has two NUC tables that provide optimum performance for different scene temperature ranges. You may switch between them anytime using the NUC Table radio buttons in WIND Viewer. A shorter integration time is recommended in the overlapping range of 25°C – 40°C (where either table is applicable).
Options:
Table 0
Table 1
Default: Table 1
0
10 - 40 °C
20 ms
1
25 - 55 °C
10 ms
FFC: The Ventus OGI offers a 1-point FFC (flat field offset correction) using an internal shutter and two 2-point NUC (gain) tables. An FFC should be performed to remove spatial noise and non-uniformities, which may develop as the camera and optics reach a stable operating temperature. Select Run to execute an FFC.
Color Palette: Various false-color palettes may be applied to the video.
Options:
Default: None
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