diff --git a/docs/en/installation/python.md b/docs/en/installation/python.md
index 17213b5..d349105 100644
--- a/docs/en/installation/python.md
+++ b/docs/en/installation/python.md
@@ -2,9 +2,12 @@
 
 <!-- TOC -->
 
-- [Requirements](#requirements)
-- [Prepare environment](#prepare-environment)
-- [Install XRPrimer(python)](#install-xrprimerpython)
+- [Installation (Python)](#installation-python)
+  - [Requirements](#requirements)
+  - [Prepare environment](#prepare-environment)
+  - [Install XRPrimer (python)](#install-xrprimer-python)
+    - [Install with pip](#install-with-pip)
+    - [Install by compiling from source](#install-by-compiling-from-source)
 
 <!-- TOC -->
 
@@ -52,7 +55,17 @@ pip install conan==1.51.1
 conan remote add openxrlab http://conan.openxrlab.org.cn/artifactory/api/conan/openxrlab
 ```
 
-d. Install PyTorch and MMCV
+d. Install Opencv
+
+```shell
+pip install opencv-python
+
+# or install opencv in headless mode
+pip install opencv-python-headless
+```
+
+
+e. Install PyTorch and MMCV
 
 Install PyTorch and torchvision following [official instructions](https://pytorch.org/).
 
diff --git a/python/xrprimer/utils/ffmpeg_utils.py b/python/xrprimer/utils/ffmpeg_utils.py
index 4a6343f..106f236 100644
--- a/python/xrprimer/utils/ffmpeg_utils.py
+++ b/python/xrprimer/utils/ffmpeg_utils.py
@@ -8,7 +8,6 @@
 from pathlib import Path
 from typing import Any, Tuple, Union
 
-import cv2
 import numpy as np
 
 from .log_utils import get_logger
@@ -484,6 +483,8 @@ def images_to_array_opencv(
     Returns:
         np.ndarray: shape will be (f * h * w * 3).
     """
+    import cv2
+
     check_path(
         input_path=input_folder,
         allowed_existence=[Existence.DirectoryExistNotEmpty],
diff --git a/requirements/runtime.txt b/requirements/runtime.txt
index 6bad103..24ce15a 100644
--- a/requirements/runtime.txt
+++ b/requirements/runtime.txt
@@ -1,2 +1 @@
 numpy
-scipy
diff --git a/requirements/synbody.txt b/requirements/synbody.txt
index 418a4da..5bb8559 100644
--- a/requirements/synbody.txt
+++ b/requirements/synbody.txt
@@ -1,3 +1,4 @@
 imath
 numpy
 openexr
+scipy
diff --git a/version.txt b/version.txt
index 4a5642a..0836732 100644
--- a/version.txt
+++ b/version.txt
@@ -1,3 +1,3 @@
 XRPRIMER_VERSION_MAJOR 0
 XRPRIMER_VERSION_MINOR 7
-XRPRIMER_VERSION_PATCH 0
+XRPRIMER_VERSION_PATCH 1