Calfa Vision
A web based annotation tool
for

Online, collaborative and free

Create your project —

Invite collaborators —

Annotate your documents —

Export the data

Free features

Collaborative with unlimited users

Share your annotation project with other users, or invite your co-workers to participate

Automated line detection

The tool detects the text lines in your document automatically. You just have to type the text manually

Semantic segmentation

We offer some generic models you can apply to analyse and identify automatically the structure of the document (main text, marginalia, footnote...)

Statistics dashboard

Find indocators to help you set up your objectives and manage your project in the dashboard

Keep control over your data

Only you and you co-workers can access the data you create and the documents you upload. At the end of your project, you can export and delete everything with one click.

A large variety of formats

Input: images in JPG/PNG/TIF, pageXML, HTML, IIIF link, Mask GT.
Export formats: pageXML, Alto, Mask GT, raw text, pair image line + text.

For both text directionalities

Annotation projects can be set up for LTR or RTL languages. Optimized and tested with oriental languages such as Arabic, Armenian etc.

Go further in realizing your OCR/HTR project

Train your custom text recognition model by using the data you created in Calfa Vision with the Research Plan

Free

Calfa Vision

Transcribe your documents

Export your data

Free features included

No support

Annotation only

Research plan

Calfa Vision
+ custom OCR model