Acquisition Modes
Area-Scan Acquisition Modes
With area-scan cameras, This board supports the following MultiCam acquisition modes:
Snapshot
In the Snapshot mode, the frame grabber repeatedly acquires individual frames. Each frame is a still picture of the observed scene at a given instant.
The Snapshot mode is intended for asynchronously reset cameras, with external trigger. It is the most relevant mode for machine vision applications.
High Frame Rate
In the High Frame Rate —HFR— mode, the frame grabber repeatedly acquires individual frames from very fast cameras. Each frame is a still picture of the observed scene at a given instant. But, it may appear that the frame duration is too short to allow software interaction each time a frame is acquired. In the HFR mode, a number of frames are grouped in a single data set and are delivered to the host memory.
The HFR mode is intended for very fast asynchronously reset cameras, with external trigger.
Refer to the MultiCam Acquisition Principles application note for additional information about acquisition modes.
Line-Scan Acquisition Modes
With line-scan cameras, This board supports the following MultiCam acquisition modes:
Page
In the Page mode, the frame grabber repeatedly acquires a set of contiguous lines. This set of line is conventionally called a page. Each page represents a discrete object moving in front of the line-scan camera.
In the Page mode, an external trigger signaling the object arrival is supported.
Web
In the Web mode, the frame grabber capture an image of infinite length of material moving in front of the line-scan camera. The image is divided in successive sets of lines called pages. The pages are a practical division of data in separate buffers for the easier software processing. Thus, there is no gap between the pages.
Long Page
The Long Page mode is an extension of the Page mode used when the size of the objects is very large. In these cases, a single object cannot be practically contained in a single data buffer. Several pages are needed to record one single object.
This mode is also especially useful when the length of the captured object is not known in advance.
Refer to the MultiCam Acquisition Principles application note for additional information about acquisition modes.
MultiCam Parameters
- With an area-scan camera, the AcquisitionMode parameter can be set to VIDEO, SNAPSHOT or HFR.
- With an line-scan camera, the AcquisitionMode parameter can be set to PAGE, WEB or LONGPAGE.