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