Crc Checksum - Basler GIGE VISION ace acA640-100gm/gc Manual

Area scan cameras

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Chunk Features

11.7 CRC Checksum

The CRC (Cyclic Redundancy Check) Checksum feature adds a chunk to each acquired image

containing a CRC checksum calculated using the Z-modem method. As shown in Figure 6-2, the

checksum is calculated using all of the image data and all of the appended chunks except for the

checksum itself. The CRC chunk is always the last chunk appended to the image data.

(including any required padding)

Fig. 65: CRC Checksum

To enable the CRC checksum chunk:

Use the Chunk Selector to select the CRC chunk.

Use the Chunk Enable parameter to set the value of the chunk to true.

Once the CRC chunk is enabled, the camera will add a CRC chunk to each acquired image.

To retrieve CRC information 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 CRC information. Note that

the CRC information provided by the chunk parser is not the CRC checksum itself. Rather it is a

true/false result. When the image and appended chunks pass through the parser, the parser

calculates a CRC checksum based on the received image and chunk information. It then compares

the calculated CRC checksum with the CRC checksum contained in the CRC checksum chunk. If

the two match, the result will indicate that the image data is OK. If the two do not match, the result

will indicate that the image is corrupted.

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 time stamp

chunk, run the parser, and retrieve the frame counter chunk data:

// Make chunk mode active and enable CRC chunk

Camera.ChunkModeActive.SetValue( true );

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CRC checksum is calculated on this data

Image Data

Note

The chunk mode must be active before you can enable the CRC feature or any

of the other chunk feature. Making the chunk mode inactive disables all chunk

features.

Chunk X

Chunk Y

Data

Chunk

CRC

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Crc Checksum - Basler GIGE VISION ace acA640-100gm/gc Manual

11.7 CRC Checksum

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