Frame Counter - Basler GIGE VISION ace acA640-100gm/gc Manual

Chunk Features

11.3 Frame Counter

The Frame Counter feature numbers frames sequentially as they are acquired. When the feature
is enabled, a chunk is added to each frame containing the value of the counter.
The frame counter is a 32 bit value. The counter starts at 0 and increments by 1 for each acquired
frame. The counter counts up to 4294967295 unless it is reset before (see below). After reaching
the maximum value, the counter will reset to 0 and then continue counting.
Be aware that if the camera is acquiring frames continuously and continuous capture is stopped,
several numbers in the counting sequence may be skipped. This happens due to the internal image
buffering scheme used in the camera.
To enable the frame counter chunk:
Use the Chunk Selector to select the Frame Counter chunk.
Use the Chunk Enable parameter to set the value of the chunk to true.
Once the frame counter chunk is enabled, the camera will add a frame counter chunk to each
acquired image.
To retrieve data from a chunk appended to an image that has been received by your PC, you must
first run the image and its appended chunks through the chunk parser included in the pylon API.
Once the chunk parser has been used, you can retrieve the frame counter information by doing the
following:
Read the value of the Chunk Frame Counter parameter.
You can set the Chunk Selector and Chunk Enable parameter value from within your application
software by using the pylon API. You can also run the parser and retrieve the chunk data. The
following code snippets illustrate using the API to activate the chunk mode, enable the frame
counter chunk, run the parser, and retrieve the frame counter chunk data:
// make chunk mode active and enable Frame Counter chunk
Camera.ChunkModeActive.SetValue( true );
Camera.ChunkSelector.SetValue( ChunkSelector_Framecounter );
Camera.ChunkEnable.SetValue( true );
// retrieve date from the chunk
IChunkParser &ChunkParser = *Camera.CreateChunkParser();
GrabResult Result;
StreamGrabber.RetrieveResult( Result );
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Note
The chunk mode must be active before you can enable the frame counter
feature or any of the other chunk feature. Making the chunk mode inactive
disables all chunk features.
Basler ace