stSoftware uses the Lucene API to provide the document indexing for searching. The functionality of the Lucene core API is extended with the Lucene Image Retrieval (LIRE) API. When an image file is uploaded/changed in the cloud file manager automatic LIRE indexing on the image is performed and stored as a searchable attribute of the image file.
The system allows for searches of images with exact or similar image content based on the LIRE index. All documents (including images) have a SHA1 checksum performed on storage. High performance searches of exact match for any file within the system can be done.