Limitations

The PISA package has various in-built limitations (buffer sizes etc.), This section details them; if they cause real problems then contact the supporter of this package.

• PISAFIND
  • The number of fragments per image (i.e. connected pixel groups) is limited to 200. Hence blends of objects cannot fragment into more than 200 pieces.
  • The number of pixels per image allowed during surface modelling is 10000.
  • The length of the first side of input image cannot be more than 10240 pixels.
  • The input data is processed using an HDS type of _WORD so the input data range must lie within the bounds -32768 to +32767, although PISAFIND itself only processes positive data up to the value 32766. This limitation is fundamental.
  • There are no other known restrictions. Input NDFs are now accessed via file mapping. There is no restriction on the number of detected objects.
• PISAFIT
  • As in PISAFIND the length of first side of the input image has to be less than 10240 pixels.
  • The input data is processed using an HDS type of _WORD so the input data range must lie within the bounds -32768 to +32767.
• PISAMATCH
  • The maximum number of input records is 10000.
• PISAKNN
  • The maximum number of input records is 10000.