画像取得#

This topic describes how to set up continuous image acquisition and offers advice on grab strategies.

Continuous Acquisition#

This sample illustrates how to set up continuous image acquisition using the LatestImageOnly grab strategy.

with pylon.InstantCamera(pylon.FirstFound) as camera:
    camera.StartGrabbing(pylon.GrabStrategy_LatestImageOnly)

    while camera.IsGrabbing():
        with camera.RetrieveResult(5000) as grab_result:
            if grab_result.GrabSucceeded():
                image = grab_result.Array

Grab Strategies#

Grab strategies define how images are handled in the internal buffer queue when the camera produces frames faster than the application consumes them.

In simple terms, they answer the question what should happen if new images arrive while the application is still processing older ones?

There are two common grab strategies:

LatestImageOnly:
- Only the newest image is kept.
- Older frames may be discarded.
OneByOne:
- All frames are queued and processed in order.
- No frames are dropped (unless buffers overflow).

The following points may help you to decide when to use which strategy:

Use LatestImageOnly for:
- Live display
- GUIs
- Low-latency systems
Use OneByOne for:
- Inspection systems
- 録画
- Deterministic processing

A detailed explanation of tradeoffs and internal behavior is provided in the Performance Optimization topic.

Mental Model#

Camera → [F1, F2, F3, F4]

LatestImageOnly:
                → Keep F4 only

OneByOne:
                → Process F1 → F2 → F3 → F4