TesseractOCR Wrapper (v2.0)

About this version

• Submitter: keighrim
• Submission Time: 2025-07-02T02:52:55+00:00
• Prebuilt Container Image: ghcr.io/clamsproject/app-tesseractocr-wrapper:v2.0

• Release Notes

  Updated to Tesseract5, and output MMIF format matches other TR apps

About this app (See raw metadata.json)

This tool applies Tesseract OCR to a video or image and generates text boxes and OCR results. Currenly only support English language.

• App ID: http://apps.clams.ai/tesseract/v2.0
• App License: Apache 2.0
• Source Repository: https://github.com/clamsproject/app-tesseractocr-wrapper (source tree of the submitted version)
• Analyzer Version: tesseract5.3
• Analyzer License: Apache 2.0

Inputs

(Note: “*” as a property value means that the property is required but can be any value.)

• http://mmif.clams.ai/vocabulary/VideoDocument/v1 (required) (of any properties)

• http://mmif.clams.ai/vocabulary/TimeFrame/v5 (required)

  • representatives = “?”

  The Time frame annotation that represents the video segment to be processed. When representatives property is present, the app will process videos still frames at the underlying time point annotations that are referred to by the representatives property. Otherwise, the app will process the middle frame of the video segment.

Configurable Parameters

(Note: Multivalued means the parameter can have one or more values.)

• tfLabel: optional, defaults to []

  • Type: string
  • Multivalued: True

  The label of the TimeFrame annotation to be processed. By default ([]), all TimeFrame annotations will be processed, regardless of their label property values.

• pretty: optional, defaults to false

  • Type: boolean
  • Multivalued: False
  • Choices: false, true

  The JSON body of the HTTP response will be re-formatted with 2-space indentation

• runningTime: optional, defaults to false

  • Type: boolean
  • Multivalued: False
  • Choices: false, true

  The running time of the app will be recorded in the view metadata

• hwFetch: optional, defaults to false

  • Type: boolean
  • Multivalued: False
  • Choices: false, true

  The hardware information (architecture, GPU and vRAM) will be recorded in the view metadata

Outputs

(Note: “*” as a property value means that the property is required but can be any value.)

(Note: Not all output annotations are always generated.)

• http://mmif.clams.ai/vocabulary/TextDocument/v1
  • @lang = “en”

  Fully serialized text content of the recognized text in the input images. Serialization isdone by concatenating text values of Paragraph annotations with two newline characters.

• http://vocab.lappsgrid.org/Token
  • text = “*”
  • word = “*”

  Translation of the recognized tesseract “words” in the input images. token properties store the string values of the recognized text. The duplication is for keepingbackward compatibility and consistency with Paragraph and Sentence annotations.

• http://vocab.lappsgrid.org/Sentence
  • text = “*”

  Translation of the recognized tesseract “lines” in the input images. sentence property from LAPPS vocab stores the string value of space-joined words.

• http://vocab.lappsgrid.org/Paragraph
  • text = “*”

  Translation of the recognized tesseract “blocks” in the input images. paragraph property from LAPPS vocab stores the string value of newline-joined sentences.

• http://mmif.clams.ai/vocabulary/Alignment/v1 (of any properties)

  Alignments between 1) TimePoint <-> TextDocument, 2) TimePoint <-> Token/Sentence/Paragraph, 3) BoundingBox <-> Token/Sentence/Paragraph

• http://mmif.clams.ai/vocabulary/BoundingBox/v4
  • label = “text”

  Bounding boxes of the detected text regions in the input images. No corresponding box for the entire image (TextDocument) region