> For the complete documentation index, see [llms.txt](https://docs.facephi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.facephi.com/docs.facephi-en/sdks/backend-sdk/selphid/release_notes/6.16.0_releasenotes.md).

# 6.16.0

This version includes an improved facial extraction engine, which solves the problem of calculating the biometric pattern in some previously cropped images. A couple of new versions of the Docker containerized services (Dockerized) have also been added.

### Added

* New C++ rest-api services.
  * `selphid-sdk-rest-api:gpu`. With GPU support in the liveness check engine.
  * `selphid-sdk-rest-api:liveness_1st`. With the experimental liveness check engine.
* New C++ rest-api endpoint `GET:/config` to obtain the service and SDK configuration.

### Improved

* New facial extraction engine that solves the problem of calculating the biometric pattern in cropped images.
* New error values added to `SelphIDIdentifier::EnrollWithExtractionResult()` and `SelphIDIdentifier::EnrollWithFacialTemplate()`.
  * `GALLERY_ID_NOT_EXISTS -1`.
  * `TEMPLATE_ID_ALREADY_EXISTS -2`.
  * `TEMPLATE_ID_EMPTY -3`.

### Changed

* The internal minimum interocular distance (IOD) has been reduced from `30px` to `20px`.