Image Engineering camSPECS User Manual page 19

Setup
spectral sensitivity
camSPECS spectral sensitivity measurements of 30+
units representative of production variation
camera
database
The method is comprised of two parts, as illustrated above, assuming the use of camSPECS software v4.2,
camSPECS monochromator, iQ-LED software v3.3, and an iQ-LEDV2-based instrument:
Setup is a do-once operation wherein a set of camera modules of a given make and model are selected that
represent production variation. Each module is measured with a monochromator (such as camSPECS, as
described in the previous section) to determine spectral sensitivity. This process is repeated for each module
in the set resulting in a spectral sensitivity camera database that characterizes the statistics of spectral
variation of the given make and model. Setup is performed for each make and model of the camera module
resulting in a unique spectral sensitivity camera database for each make and model of a camera module.
Setup best practices are comprised of the following steps Spectral Sensitivity Database Creation, iQ-LED
Settings, and Verification.
Spectral Sensitivity Database Creation:
1. Select 43 camera modules that are representative of the expected production variation.
2. Select one of the camera modules to optimize the exposure of the camSPECS filter plate, allowing for
adequate headroom. Capture a black frame with these settings.
3. Select 43 camera modules and make captures with these settings of the camSPECS filter plate.
4. Select 40 of the 43 camera modules. The remaining three modules will be used later for Verification.
Create the representative spectral sensitivity database by loading the black frame and all 40 captures of
the camSPECS filter plate in the Images section of the Spectral sensitivity (camSPECS) module. After
selecting Start, each module's spectral sensitivity will be displayed and should be inspected for expected
behavior. Once all 40 modules have been processed, the new representative spectral sensitivity
database is written to Program Files > Image Engineering > camSPECS > lib.
Image Engineering
Production
iQ- LED device
spectral data
~ weekly recalibration
iQ-LED
calibration data
spectral sensitivity
estimation
Production units
RGB data
captured images
7-22 images per
sample
Wavelength [nm]
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