About

hOCR is a format for representing OCR output, including layout information, character confidences, bounding boxes, and style information. It embeds this information invisibly in standard HTML. By building on standard HTML, it automatically inherits well-defined support for most scripts, languages, and common layout options. Furthermore, unlike previous OCR formats, the recognized text and OCR-related information co-exist in the same file and survives editing and manipulation. hOCR markup is independent of the presentation.

There is a Public Specification for the hOCR Format.

Available Programs

Included command line programs:

hocr-check -- check the hOCR file for errors
hocr-combine -- combine pages in multiple hOCR files into a single document
hocr-eval -- compute number of segmentation and OCR errors
hocr-eval-geom -- compute over, under, and mis-segmentations
hocr-eval-lines -- compute OCR errors of hOCR output relative to text ground truth
hocr-split -- split an hOCR file into individual pages
hocr-merge-dc -- merge Dublin Core meta data into the hOCR HTML header

See the CommandLine Wiki page for more information.

Planned Programs

hocr-merge-text -- merges groundtruth text into hOCR output (linewise or unaligned)

Possible Programs

hocr-eval-pagenos -- determine accuracy of logical page number labels
hocr-generate-cuts -- given an hocr file and a binary image, generate reasonable cuts
hocr-generate-xboxes -- given an hocr file containing cuts and a binary image, generate bounding boxes
hocr-as-no-html -- remove all HTML markup from an hOCR file
hocr-as-absolute-html -- generate HTML with absolute positioning from hOCR output
hocr-as-xytable -- generate an XY-table layout from hOCR output
hocr-as-simple-html -- generate simple, logically marked up from hOCR output

Planned Converters

Please let us know if you want to help with these.

unz2hocr -- UNLV zone file to hOCR converter
icdar2hocr -- convert ICDAR competition format to hOCR
xdoc2hocr -- convert XDOC format to hOCR
dafs2hocr -- convert DAFS to hOCR
djvu2hocr -- convert DjVu XML to hOCR
lura2hocr -- convert Luratech Abbyy XML to hOCR