How it works

  • The pixel array is divided into two interleaved sets of rows:
    • Even lines (rows 0, 2, 4, …)
    • Odd lines (rows 1, 3, 5, …)
  • The sensor’s timing and control circuits allow independent exposure control for each set.
  • As a result, two images with different exposures are captured within a single frame readout:
    • One image composed of even lines (short or long exposure)
    • One image composed of odd lines (opposite exposure)

Why it’s useful

  1. High Dynamic Range (HDR)
    • Captures bright and dark details simultaneously by combining the short-exposure and long-exposure data.
  2. Motion Analysis
    • Alternating exposure settings can help analyze moving objects at different light levels or speeds.
  3. Specialized Scientific Imaging
    • Enables capturing two “modes” of data in a single frame for faster acquisition.

Advantages

  • No frame-to-frame delay — both exposures are captured in the same frame time.
  • Reduced motion artifacts compared to taking two separate frames with different exposures.
  • Higher temporal resolution for dual-exposure data capture.

Limitations

  • Vertical resolution per exposure is halved (since each exposure uses only half the lines).
  • Requires post-processing to reconstruct two full-resolution images.
  • Not ideal for scenes with fine horizontal detail if reconstruction is needed.

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