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ocrd(-aemon)

self-hostable ocr api for macos

Install

git clone https://github.com/evanwashere/ocrd.git

Build

swift run -c release swift build -c release

Recommendations

  • comment or configure proxy in Sources/ocrd/api.swift:118
  • add trusted domains to domains list in Sources/ocrd/api.swift:105
  • example proxy setup – wireproxy + dedicated ip/server for untrusted domains traffic

Command Line Usage

ocrd -h

Usage: ocrd <command>

Commands:
  routes Displays all registered routes.
   serve Begins serving the app over HTTP.

ocrd serve

Usage: ocrd serve [--hostname,-H] [--port,-p] [--bind,-b] [--unix-socket] 

Begins serving the app over HTTP.

Options:
     hostname Set the hostname the server will run on.
         port Set the port the server will run on.
         bind Convenience for setting hostname and port together.
  unix-socket Set the path for the unix domain socket file the server will bind to.

API docs

GET / -> "ok"

health check endpoint

GET /revisions -> str[]

lists ocr engine revisions

GET /image-types -> str[]

lists image types supported by api

GET /languages -> str[]

lists languages supported by the ocr engine

POST / -> Result

do ocr on a single image

body:

  • json <- ImageSource
  • bytes <- raw image bytes

query params (optional):

  • words <- str[]
  • revision <- string
  • languages <- str[]
  • autocorrect <- bool
  • mode <- fast | accurate
  • detect_language <- bool

detailed description of each parameter can be found in Apple API Docs

POST /batch -> Result[]

body:

  • json <- ImageSource[]

query params (optional):

  • words <- str[]
  • revision <- string
  • languages <- str[]
  • autocorrect <- bool
  • mode <- fast | accurate
  • detect_language <- bool

detailed description of each parameter can be found in Apple API Docs

API Types

ImageSource

type ImageSource =
  { url: string; }
  | { base64: string; }
  | { bytes: number[]; }

Result

type Result = Ok | Err;

type Err = {
  error: bool;
  reason: string;
}

type Ok = {
  width: number;
  height: number;
  content: string;
  observations: TextObservation[];
}

type TextObservation = {
  box: Box;
  content: string;
  confidence: number;
}

type Box = {
  x: number;
  y: number;
  width: number;
  height: number;
}

License

Apache 2.0 © Evan