101 lines
3.7 KiB
Python
101 lines
3.7 KiB
Python
"""
|
||
本地 OCR 工具
|
||
- OCR引擎: rapidocr-onnxruntime (~1s/次, 中英文准确率高, 带bbox)
|
||
- 坑(rapid): result[i][2] conf 是 str 不是 float
|
||
- 坑(rapid): 无文字时 result 返回 None 而非空列表
|
||
- 坑: enhance 放大+高对比度处理，对清晰文字有害，默认关闭
|
||
- 坑(远程桌面): ImageGrab/mss 在 RDP 断开后截图全黑，用 ocr_window(hwnd) 代替
|
||
"""
|
||
import re
|
||
from PIL import ImageGrab, Image, ImageEnhance
|
||
|
||
_LANG = 'zh-Hans-CN'
|
||
_rapid_engine = None
|
||
|
||
def _get_rapid():
|
||
global _rapid_engine
|
||
if _rapid_engine is None:
|
||
from rapidocr_onnxruntime import RapidOCR
|
||
_rapid_engine = RapidOCR()
|
||
return _rapid_engine
|
||
|
||
def _preprocess(img, scale=3, contrast=3.0):
|
||
img = ImageEnhance.Contrast(img).enhance(contrast)
|
||
img = img.resize((img.width * scale, img.height * scale))
|
||
return img
|
||
|
||
def _strip_cjk_spaces(t):
|
||
return re.sub(r'(?<=[\u4e00-\u9fff])\s+(?=[\u4e00-\u9fff])', '', t)
|
||
|
||
def _ocr_rapid(img):
|
||
import numpy as np
|
||
engine = _get_rapid()
|
||
arr = np.array(img)
|
||
result, elapse = engine(arr)
|
||
if not result:
|
||
return {'text': '', 'lines': [], 'details': []}
|
||
lines = [r[1] for r in result]
|
||
details = [{'bbox': r[0], 'text': r[1], 'conf': float(r[2])} for r in result]
|
||
text = _strip_cjk_spaces('\n'.join(lines))
|
||
return {'text': text, 'lines': [_strip_cjk_spaces(l) for l in lines], 'details': details}
|
||
|
||
def ocr_image(image_input, lang=_LANG, enhance=False, engine=None):
|
||
"""
|
||
对 PIL Image 做 OCR
|
||
:param image_input: PIL Image 对象 或 文件路径(str)
|
||
:param lang: 保留参数，当前未使用
|
||
:param enhance: 预处理
|
||
:param engine: 保留参数，当前仅支持 rapid/None
|
||
:return: dict {'text': 全文, 'lines': [行文本], 'details': [bbox+conf]}
|
||
"""
|
||
if isinstance(image_input, str):
|
||
image_input = Image.open(image_input)
|
||
if enhance:
|
||
image_input = _preprocess(image_input)
|
||
if engine not in (None, 'rapid'):
|
||
raise ValueError("Only rapid OCR is supported")
|
||
return _ocr_rapid(image_input)
|
||
|
||
def ocr_screen(bbox=None, lang=_LANG, enhance=False, engine=None):
|
||
"""
|
||
截取屏幕区域并 OCR
|
||
:param bbox: (x1, y1, x2, y2) 像素坐标，None=全屏
|
||
:return: dict {'text': 全文, 'lines': [行文本], 'details': [bbox+conf](仅rapid)}
|
||
"""
|
||
img = ImageGrab.grab(bbox=bbox)
|
||
return ocr_image(img, lang, enhance, engine)
|
||
|
||
def ocr_window(hwnd, lang=_LANG, enhance=False, engine=None):
|
||
"""
|
||
截取窗口并 OCR (使用 PrintWindow API，支持远程桌面断开场景)
|
||
:param hwnd: 窗口句柄(int)
|
||
:return: dict {'text': 全文, 'lines': [行文本], 'details': [bbox+conf](仅rapid)}
|
||
"""
|
||
import win32gui, win32ui
|
||
from ctypes import windll
|
||
l, t, r, b = win32gui.GetWindowRect(hwnd)
|
||
w, h = r - l, b - t
|
||
hwndDC = win32gui.GetWindowDC(hwnd)
|
||
mfcDC = win32ui.CreateDCFromHandle(hwndDC)
|
||
saveDC = mfcDC.CreateCompatibleDC()
|
||
saveBitMap = win32ui.CreateBitmap()
|
||
saveBitMap.CreateCompatibleBitmap(mfcDC, w, h)
|
||
saveDC.SelectObject(saveBitMap)
|
||
windll.user32.PrintWindow(hwnd, saveDC.GetSafeHdc(), 3)
|
||
bmpinfo = saveBitMap.GetInfo()
|
||
bmpstr = saveBitMap.GetBitmapBits(True)
|
||
img = Image.frombuffer('RGB', (bmpinfo['bmWidth'], bmpinfo['bmHeight']), bmpstr, 'raw', 'BGRX', 0, 1)
|
||
win32gui.DeleteObject(saveBitMap.GetHandle())
|
||
saveDC.DeleteDC()
|
||
mfcDC.DeleteDC()
|
||
win32gui.ReleaseDC(hwnd, hwndDC)
|
||
return ocr_image(img, lang, enhance, engine)
|
||
|
||
if __name__ == "__main__":
|
||
r = ocr_screen((0, 0, 400, 100))
|
||
print(f"识别结果: {r['text']}")
|
||
for line in r['lines']:
|
||
print(f" 行: {line}")
|
||
if 'details' in r:
|
||
for d in r['details']:
|
||
print(f" [{d['conf']:.3f}] {d['text']}") |