TECHNICAL COLUMN / Imaging

Line scan or area scan — what to define first

Capture an area at once or build an image line by line. Choose a camera around the target, feature size and process.

Imaging
Line scan synchronizes with motion; area scan captures a region. Both require suitable sampling and exposure.
Line scan synchronizes with motion; area scan captures a region. Both require suitable sampling and exposure.Concept diagram · not a measured result

Camera type is an early decision in an imaging setup. Choose by suitability for the target and process, rather than assuming one type is better.

Area-scan cameras

Read the dedicated area-scan article for principles and lighting considerations.

Area scan captures a rectangular region in one image. It suits stationary parts, manually repositioned samples and early evaluation. Resolution depends on sensor characteristics, pixel count and field of view. For moving targets, consider exposure and blur.

Line-scan cameras

See the line-scan article for motion synchronization and illumination.

Line scan captures a single line at a time. Movement of the target or camera stacks those lines into an image. It suits continuous surfaces and fine features when the required sampling, lens, lighting and motion are achieved.

Transport, acquisition and lighting must be coordinated. A stationary prototype test may not reproduce the appearance under actual motion. Lighting should cover the capture line appropriately.

Define conditions in this order

  1. Feature size and how the target moves
  2. Capture area and allowable acquisition time
  3. Required light and whether the lighting can provide it

OptTech hybrid lighting is designed for line cameras. If you are starting with area scan, defining the imaging conditions helps us discuss a suitable camera setup. Provide target images and a brief process outline for a technical consultation.

Comparison checklist

Item What to confirm
Target motion Stationary or moving during acquisition
Field of view Overall target size and the smallest feature
Imaging conditions Acquisition time, positioning variation and depth of field
Installation Available space, motion synchronization and lighting placement

Camera type alone does not establish detection capability. See hybrid lighting and our imaging setup service.

← All technical articles

TECHNOLOGY NOTES

Related technical articles

All technical articles