Basler Camera User Manual

Features AW00123402000
250 Basler ace USB 3.0
8.17.4 Retrieving Data Chunks
When the chunk mode is active and data chunks are enabled, the selected data chunks are
appended to each acquired image when the image is transferred to the host PC (see Section 8.17.1
on page 242), creating a set of chunks.
The set of chunks includes chunk 1 with the image data ("image data payload") and related
supplementary data (chunk ID and length of the image data payload), followed by the selected data
chunks, each one consisting of the chunk payload and supplementary data.
The PayloadSize parameter value for the device (i.e. for the camera) indicates the calculated
maximum size ("maximum buffer size") that can be expected to occur for a set of chunks. The
calculated maximum size is derived from the current camera parameter settings (ROI size, pixel
format, selected data chunks, etc.).
The actual size of a set of chunks as received by the PC ("grab result") can be read form the
PayloadSize value for the grab result. The actual size will be equal to or smaller than the
calculated maximum size.
A set of chunks (chunks one through N) is illustrated in Figure 97. The example assumes that the
CRC Checksum chunk was enabled.
Fig. 97: Example of a Set of Chunks Related to One Image Acquisition
Make sure all camera parameters are set as desired before reading the
PayloadSize parameter value.
Chunk
1
(Image data payload)
Chunk
1
(ID)
Chunk
N
CRC
Chunk
1
(Length)
...
Chunk
2
(Length)
Chunk
N
(Length)
Chunk
N
(ID)
Chunk
2
(ID)
Chunk
2
(Payload)
32 bit
32 bit
32 bit
32 bit
32 bit
32 bitLength
Length
Length
Chunk 1
Chunk 2
Chunk N
Actual payload size of the grab result

Basler Camera Specifications

General

Category	Security Camera
Brand	Basler
Resolution	Varies by model
Sensor Type	CMOS
Frame Rate	Varies by model
Dimensions	Varies by model
Weight	Varies by model
Interface	GigE, USB 3.0
Lens Mount	C-Mount, CS-Mount