Pythonista Text OCR example.

ocr.py

import photos
import objc_util

VNImageRequestHandler = objc_util.ObjCClass('VNImageRequestHandler')
VNRecognizeTextRequest = objc_util.ObjCClass('VNRecognizeTextRequest')

def text_ocr(asset):
  img_data = objc_util.ns(asset.get_image_data().getvalue())

  with objc_util.autoreleasepool():
    req = VNRecognizeTextRequest.alloc().init().autorelease()
    # print(req.supportedRecognitionLanguagesAndReturnError_(None))
    req.setRecognitionLanguages_(['zh-Hans'])
    req.setRecognitionLevel_(0)

    handler = VNImageRequestHandler.alloc().initWithData_options_(img_data, None).autorelease()
    success = handler.performRequests_error_([req], None)
    if success:
        for result in req.results():
          print(result.text())

def main():
    all_assets = photos.get_assets()
    asset = photos.pick_asset(assets=all_assets)
    if asset is None:
        return
    text_ocr(asset)
    
if __name__ == '__main__':
    main()