Feat: Add C++ demo for Palm Detection (#282)

* add cpp demo for palm detection

* add all anchor points

* remove HandDetector class

* refactor code

models/palm_detection_mediapipe/CMakeLists.txt

@@ -0,0 +1,11 @@
+cmake_minimum_required(VERSION 3.24.0)
+project(opencv_zoo_qrcode_wechatqrcode)
+
+set(OPENCV_VERSION "4.10.0")
+set(OPENCV_INSTALLATION_PATH "" CACHE PATH "Where to look for OpenCV installation")
+
+# Find OpenCV
+find_package(OpenCV ${OPENCV_VERSION} REQUIRED HINTS ${OPENCV_INSTALLATION_PATH})
+
+add_executable(demo demo.cpp)
+target_link_libraries(demo ${OpenCV_LIBS})

models/palm_detection_mediapipe/README.md

@@ -13,6 +13,8 @@ SSD Anchors are generated from [GenMediaPipePalmDectionSSDAnchors](https://githu
 
 ## Demo
 
+### Python
+
 Run the following commands to try the demo:
 
 ```bash
@@ -25,6 +27,23 @@ python demo.py -i /path/to/image -v
 python demo.py --help
 ```
 
+### C++
+
+Install latest OpenCV (with opencv_contrib) and CMake >= 3.24.0 to get started with:
+
+```shell
+# A typical and default installation path of OpenCV is /usr/local
+cmake -B build -D OPENCV_INSTALLATION_PATH=/path/to/opencv/installation .
+cmake --build build
+
+# detect on camera input
+./build/demo
+# detect on an image
+./build/demo -i=/path/to/image -v
+# get help messages
+./build/demo -h
+```
+
 ### Example outputs
 
 ![webcam demo](./example_outputs/mppalmdet_demo.gif)