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# https://learn.microsoft.com/en-us/windows/powertoys/text-extractor#how-to-query-for-ocr-language-packs
import platform
if platform.system() == 'Windows' and platform.version() >= '10.0.10240.0':
try:
from winsdk.windows.media.ocr import OcrEngine
from winsdk.windows.globalization import Language
from winsdk.windows.storage.streams import DataWriter
from winsdk.windows.graphics.imaging import SoftwareBitmap, BitmapPixelFormat
import numpy as np
import cv2, asyncio
from typing import List
from .base import register_OCR, OCRBase, LOGGER, TextBlock
def get_supported_language_packs():
return list(OcrEngine.available_recognizer_languages)
def ocr(byte, width, height, lang='en'):
writer = DataWriter()
writer.write_bytes(byte)
sb = SoftwareBitmap.create_copy_from_buffer(writer.detach_buffer(), BitmapPixelFormat.RGBA8, width, height)
return OcrEngine.try_create_from_language(Language(lang)).recognize_async(sb)
async def coroutine(awaitable):
return await awaitable
winocr_available_recognizer_languages = get_supported_language_packs()
if len(winocr_available_recognizer_languages) > 0:
class WindowsOCR:
lang = winocr_available_recognizer_languages[0].language_tag
def __call__(self, img: np.ndarray) -> str:
img = cv2.cvtColor(img, cv2.COLOR_RGB2RGBA)
w, h = img.shape[1], img.shape[0]
return asyncio.run(coroutine(ocr(img.tobytes(), w, h, self.lang))).text
languages_display_name = [lang.display_name for lang in winocr_available_recognizer_languages]
languages_tag = [lang.language_tag for lang in winocr_available_recognizer_languages]
@register_OCR('windows_ocr')
class OCRWindows(OCRBase):
params = {
'language': {
'type':'selector',
'options': languages_display_name,
'value': languages_display_name[0],
}
}
language = languages_display_name[0]
def __init__(self, **params) -> None:
super().__init__(**params)
self.engine = WindowsOCR()
self.engine.lang = self.get_engine_lang()
def get_engine_lang(self) -> str:
language = self.params['language']['value']
tag_name = languages_tag[languages_display_name.index(language)]
return tag_name
def ocr_img(self, img: np.ndarray) -> str:
self.engine(img)
def _ocr_blk_list(self, img: np.ndarray, blk_list: List[TextBlock], *args, **kwargs) -> None:
im_h, im_w = img.shape[:2]
for blk in blk_list:
x1, y1, x2, y2 = blk.xyxy
if y2 < im_h and x2 < im_w and \
x1 > 0 and y1 > 0 and x1 < x2 and y1 < y2:
blk.text = self.engine(img[y1:y2, x1:x2])
else:
self.logger.warning('invalid textbbox to target img')
blk.text = ['']
def updateParam(self, param_key: str, param_content):
super().updateParam(param_key, param_content)
self.engine.lang = self.get_engine_lang()
else:
LOGGER.warning(f'No supported language packs found for windows, Windows OCR will be unavailable.')
except Exception as e:
LOGGER.error(f'Failed to initialize windows OCR:')
LOGGER.error(e)
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