High-resolution cameras, such as those featuring 25 megapixels, offer increased field of view and/or throughput. However, these advantages are only truly realized in inspection and metrology applications where images must be uniform with linear pixel response. To address deviations like fixed pattern noise (FPN), photoresponse non-uniformity (PRNU), or shading, cameras employ Active Sensor Control (ASC)—an automated correction method that ensures consistent image quality.

In ultra-high-resolution systems, the impact of these defects becomes more pronounced. ASC is not merely a factory calibration process for identifying defective pixels; it dynamically corrects issues during operation by mapping problematic pixels to their nearest neighbors. This advanced technique preserves metrology information and enhances accuracy in optical measurement applications where pixel reliability is critical.

For instance, a 25-megapixel CMOS camera can have up to 10,000 defective pixels. When ASC is enabled, defect reduction can be as significant as tenfold. The primary goal of ASC is to maintain image integrity under demanding conditions, such as varying temperatures or changing lighting scenarios.

Here are some system scenarios where ASC delivers exceptional benefits:

  • Temperature fluctuations: ASC maintains usable images over a broader temperature range with minimal recalibration time.
  • Camera timing adjustments: When switching integration times, multiple calibration datasets can be stored and accessed via serial commands for seamless performance changes.
  • Multiple lenses: ASC supports rapid global flat-field calibration to compensate for lens-specific variations during multi-lens operations.
  • Light wavelength shifts: Different spectral conditions require ASC to adapt quickly to maintain image quality across wavelengths.
  • Brightfield linearity optimization: If a camera exhibits sufficient dark behavior but lacks the required brightfield linearity, ASC can incorporate specific calibrations to enhance accuracy.

By maximizing usable pixels even in challenging environments, Active Sensor Control unlocks the full potential of high-resolution cameras for metrology and inspection applications.

For further details on how ASC integrates with 25-megapixel systems or its testing procedures, explore our related blog posts:

  • “25 Megapixel CMOS Cameras for Metrology and Inspection Applications with Active Sensor Control”
  • “See the Image Quality Improvements on Vita 5k 25 Megapixel Sapphire Cameras with Active Sensor Control”

Last Updated: 2025-09-04 19:37:37