Trying to use Mono16

Answered

Nathaniel Weger

• August 14, 2023 18:22

Hello! I'm trying to convert an image from my Blackfly S USB3 to a numpy array in Python. However, because my exposure is so low, the values of this array are usually only in the range of 0 to 7 out of 256 (for 8 bit values). I'd like more granularity in these values, so I'm trying to use 16 bit instead of 8. But when I try to use the PixelFormat_Mono16 instead of Mono8 in "image_converted = processor.Convert(image_result, PySpin.PixelFormat_Mono16)" in the acquisition.py example file, I get a lot of issues. Can somebody please help me resolve this, or point me to somebody who can? Thanks! - Nate

1

• Official comment

  

  TDY_Ifeanyi

  Community team

  • August 16, 2023 10:02

  

  

  Hi Nathaniel,

  You could reference ImageFormatControl.py example code for more details of how to set pixel format to mono12p/packed:

   node_pixel_format = PySpin.CEnumerationPtr(nodemap.GetNode('PixelFormat'))
          if PySpin.IsReadable(node_pixel_format) and PySpin.IsWritable(node_pixel_format):

              # Retrieve the desired entry node from the enumeration node
              node_pixel_format_mono12p = PySpin.CEnumEntryPtr(node_pixel_format.GetEntryByName('Mono12p'))
              if PySpin.IsReadable(node_pixel_format_mono12p):

                  # Retrieve the integer value from the entry node
                  pixel_format_mono12p = node_pixel_format_mono12p.GetValue()

                  # Set integer as new value for enumeration node
                  node_pixel_format.SetIntValue(pixel_format_mono12p)

  However, 12-bit is packed pixel format and require to unpack before retrieving numpy array. With our sdk, user could unpack to 16-bit without affecting the actual resolution:

  image_converted = processor.Convert(image_result_in_12bit_packed, PySpin.PixelFormat_Mono16)

  Please let me know if this information answered your question.

  Regards,

  Ifeanyi
• 

  TDY_Ifeanyi

  Community team

  • August 15, 2023 11:18

  

  

  Hello Nathaniel,

  If I understood very well, it seems you are trying to convert 8-bit pixel format to 16-bit format. Our sdk does not support such image processing and enlargement.

  One approach is to set image pixel format to 16-bit and retrieve numpy array of grabbed image directly. Another approach is to set pixel format to 12-bit packed, unpack the raw image to 16-bit using 'processor.Convert', and then retrieve numpy array of resultant image. 

  I hope the provided information help to resolve this issue.

  Regards,

  Ifeanyi

   

   

  0
• 

  Nathaniel Weger

  • August 15, 2023 16:23

  Hello Ifeanyi,

  Thanks for your response! It looks like the camera only goes up to 12 bits, so that's my goal I guess. But yes, I would really like to directly retrieve a numpy array of the image in 12 bit (I never need it to be in 8-bit), but I am not sure how to do this. Is there an extra line I need to add to make sure that the image is in Mono12?

  Thanks,

  Nate

  0

Please sign in to leave a comment.