build(python): make OpenCV headless by default with optional GUI support (issue #737)

python/pyproject.toml

@@ -45,6 +45,7 @@ rapidocr = "rapidocr.main:main"
 
 [project.optional-dependencies]
 rtl = ["python-bidi>=0.4.2,<1.0"]
+opencv-python = ["opencv-python>=4.5.1.48"]
 
 [tool.setuptools]
 include-package-data = true

python/requirements.txt

@@ -1,5 +1,5 @@
 pyclipper>=1.2.0
-opencv_python>=4.5.1.48
+opencv-python-headless>=4.5.1.48
 numpy>=1.19.5,<3.0.0
 six>=1.15.0
 Shapely>=1.7.1,!=2.0.4  # python3.12 2.0.4 bug
@@ -8,4 +8,4 @@ Pillow
 tqdm
 omegaconf!=2.2.1 # https://github.com/omry/omegaconf/issues/934
 requests
-colorlog
+colorlog