migrating from DUGallery

I have a large photo database system (DUgallery) that I would like to migrate to Gallery2.

I need some help getting started. I'm comfortable writing some code to import to Gallery2, but I'm not very familiar with what Gallery2 would need as far as data to properly import. The pictures are all stored in a directory. I'm running in embedded mode and the link table has the ids that match the userids in the existing photo database.

My structure is:
PIC_ID
PIC_TYPE (category)
PIC_NAME
PIC_IMAGE
PIC_HEIGHT
PIC_WIDTH
PIC_VIEW
PIC_DATED
PIC_APPROVED
PIC_DESCRIPTION
PIC_ADDEDBY (userid)

Please advise on experience, best approach, and if there is something similar I can modify for my use.

Thanks for your help in advance!