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How is the vision extra information stored in the png file

Hello everybody.

 

I have a short question regarding to the saving of the vision extra information like the overlay informationen, pattern matching information and the calibration information in a PNG-file with the 'IMAQ write file 2'. How is the extra vision informationen stored within the png-file? I already found out that all the extra information is stored via the chunk 'niEi' in compressed form (https://forums.ni.com/t5/Machine-Vision/How-to-extract-Overlay-data-from-png-file/td-p/1256544) but how is the data structured after decompression? The background of my question is that we would like to read the calibration information outside from LabVIEW with Python capabilities. Thanks for every hint. 🙂

 

Best regards

Falk

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