Find documents with or without image descriptor

If you do not have indexed image descriptor for your complete collection but only for a portion, you want to cope with this situation. pixolution flow automatically creates dedicated fields for storing visual information.

Using these fields in a filter query (this example assumes pixolution.fieldname.prefix=pxl_), you can

  1. identify documents which have an image descriptor:
&q=*:*&fq=(pxl_textspace_n:1 OR pxl_textspace_n:0)
  1. identify documents without an image descriptor:
&q=*:*&fq=-(pxl_textspace_n:1 OR pxl_textspace_n:0)

Doing so, you can either index the image descriptors for the missing documents or perform a faster visual search.