diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..68bc17f9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,160 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
diff --git a/README_cn.md b/README_cn.md
index a2c7b520..a4cd08bf 100644
--- a/README_cn.md
+++ b/README_cn.md
@@ -166,6 +166,29 @@ WaterMark(..., processes=None)
 ```
 - `processes`: 整数，指定线程数。默认为 `None`, 表示使用全部线程。
 
+# 在内存中操作
+
+以下的 `bytes(...)` **仅作示意**，即需要传入 `bytes` 对象。
+
+嵌入图片：
+```python
+from blind_watermark import WaterMark
+
+bwm1 = WaterMark(password_wm=1, password_img=1)
+# 读取原始图
+bwm1.read_img(img=bytes(...))
+# 读取水印图
+bwm1.read_wm(bytes(...))
+# 嵌入
+bwm1.embed_bytes()
+```
+
+解水印：（注意设定水印形状 `wm_shape`）
+```python
+bwm1 = WaterMark(password_wm=1, password_img=1)
+# wm_shape 是必要的
+bwm1.extract(embed_img=bytes(...), wm_shape=(128, 128))
+```
 
 ## 相关项目
 
diff --git a/blind_watermark/blind_watermark.py b/blind_watermark/blind_watermark.py
index 1eff8056..bf04b697 100644
--- a/blind_watermark/blind_watermark.py
+++ b/blind_watermark/blind_watermark.py
@@ -1,7 +1,8 @@
 #!/usr/bin/env python3
 # coding=utf-8
-# @Time    : 2020/8/13
+# @Time    : 2023/04/01
 # @Author  : github.com/guofei9987
+# @Author  : github.com/jinzhijie
 import warnings
 
 import numpy as np
@@ -28,14 +29,23 @@ def read_img(self, filename=None, img=None):
             img = cv2.imread(filename, flags=cv2.IMREAD_UNCHANGED)
             assert img is not None, "image file '{filename}' not read".format(filename=filename)
 
+        if isinstance(img, bytes):
+            # 读取 bytes 对象
+            buf = np.frombuffer(img, np.uint8)
+            img = cv2.imdecode(buf, flags=cv2.IMREAD_UNCHANGED)
+
         self.bwm_core.read_img_arr(img=img)
         return img
 
     def read_wm(self, wm_content, mode='img'):
         assert mode in ('img', 'str', 'bit'), "mode in ('img','str','bit')"
         if mode == 'img':
-            wm = cv2.imread(filename=wm_content, flags=cv2.IMREAD_GRAYSCALE)
-            assert wm is not None, 'file "{filename}" not read'.format(filename=wm_content)
+            if isinstance(wm_content, bytes):
+                buf = np.frombuffer(wm_content, dtype=np.uint8)
+                wm = cv2.imdecode(buf, flags=cv2.IMREAD_GRAYSCALE)
+            else:
+                wm = cv2.imread(filename=wm_content, flags=cv2.IMREAD_GRAYSCALE)
+                assert wm is not None, 'file "{filename}" not read'.format(filename=wm_content)
 
             # 读入图片格式的水印，并转为一维 bit 格式，抛弃灰度级别
             self.wm_bit = wm.flatten() > 128
@@ -74,6 +84,10 @@ def embed(self, filename=None, compression_ratio=None):
                 cv2.imwrite(filename=filename, img=embed_img)
         return embed_img
 
+    def embed_bytes(self, ext='.png'):
+        embed_img = self.bwm_core.embed()
+        return cv2.imencode(ext, embed_img)[1]
+
     def extract_decrypt(self, wm_avg):
         wm_index = np.arange(self.wm_size)
         np.random.RandomState(self.password_wm).shuffle(wm_index)
@@ -86,6 +100,10 @@ def extract(self, filename=None, embed_img=None, wm_shape=None, out_wm_name=None
         if filename is not None:
             embed_img = cv2.imread(filename, flags=cv2.IMREAD_COLOR)
             assert embed_img is not None, "{filename} not read".format(filename=filename)
+        
+        if isinstance(embed_img, bytes):
+            buf = np.frombuffer(embed_img, dtype=np.uint8)
+            embed_img = cv2.imdecode(buf, flags=cv2.IMREAD_COLOR)
 
         self.wm_size = np.array(wm_shape).prod()
 
@@ -100,9 +118,10 @@ def extract(self, filename=None, embed_img=None, wm_shape=None, out_wm_name=None
         # 转化为指定格式：
         if mode == 'img':
             wm = 255 * wm.reshape(wm_shape[0], wm_shape[1])
-            cv2.imwrite(out_wm_name, wm)
+            if out_wm_name is not None:
+                cv2.imwrite(out_wm_name, wm)
         elif mode == 'str':
-            byte = ''.join((np.round(wm)).astype(np.int).astype(np.str))
+            byte = ''.join((np.round(wm)).astype(int).astype(str))
             wm = bytes.fromhex(hex(int(byte, base=2))[2:]).decode('utf-8', errors='replace')
 
         return wm