This blog post explores key parameters that influence signal processing in Charge-Coupled Device (CCD) cameras, focusing on Gain and Offset.

Gain Control

Gain amplifies the CCD’s output signal, manually or automatically adjusting its strength. Higher gain levels enhance image contrast but can introduce noise if overused.

  • Function: Amplification of the raw signal from the CCD sensor.
  • Adjustment Modes:
    • Manual control for precise customization.
    • Automatic adjustment based on predefined settings.

Offset Adjustment

Offset adds a fixed value to the CCD’s output, uniformly increasing all pixel gray levels. This parameter allows manual or automatic tuning to enhance image brightness without altering contrast.

  • Function: Brightness enhancement by shifting the baseline signal level.
  • Adjustment Modes:
    • Manual override for targeted adjustments.
    • Automatic calibration based on system parameters.

Auto Exposure and Exposure Reference

Auto Exposure automates exposure time and gain management, while the Exposure Reference guides this process. The system compares the average gray value of the current image with the reference to adjust exposure settings accordingly.

  • Function: Dynamic adjustment of exposure for optimal image quality.
  • Mechanism:
    • Continuously monitors mean gray values against the reference.
    • Automatically adjusts both exposure time and gain when discrepancies exist.

This series continues in Part 2, covering additional critical parameters.

Last Updated: 2025-09-05 02:06:18