# opencv_example

**Repository Path**: hanlt/opencv_example

## Basic Information

- **Project Name**: opencv_example
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: public
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 1
- **Forks**: 0
- **Created**: 2024-11-19
- **Last Updated**: 2024-11-20

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

## 构建

1. 从源码编译OpenCV
```
$ git clone https://github.com/opencv/opencv.git
$ cmake -G Ninja -S opencv -B opencv/build -DCMAKE_INSTALL_PREFIX=opencv/build/install
$ ninja -C opencv/build install
```

2. 从源码编译Google Benchmark

```
$ git clone https://github.com/google/benchmark.git
$ cmake -G Ninja -S benchmark -DCMAKE_BUILD_TYPE=Release -B benchmark/build -DBENCHMARK_DOWNLOAD_DEPENDENCIES=ON
$ ninja -C benchmark/build
```

3. 编译本项目
```
$ git clone https://gitee.com/hanlt/opencv_example.git
$ cmake -G Ninja -S opencv_example -DCMAKE_BUILD_TYPE=Release -B opencv_example/build -DOpenCV_DIR=<opencv/build/install/lib/cmake/opencv4> -Dbenchmark_DIR=<benchmark/build>
$ ninja -C opencv_example/build
```

## 测试

可执行程序位于 `opencv_example/build`目录中：

- contours 边缘检测
- gary 灰度化
- qrcode 二维码检测
- remap 仿射变换
- smooth 高斯模糊

示例：
```
$ cd opencv_example

$ ./build/smooth

----------------------------------------------------------
Benchmark                Time             CPU   Iterations
----------------------------------------------------------
GaussianBlur           178 ms          154 ms            4
BM_imread             72.1 ms         72.1 ms           10
BM_GaussianBlur       48.3 ms         39.8 ms           19
BM_imwrite            34.7 ms         34.5 ms           21
```
分别表示GaussianBlur的总执行时间以及imread、GaussianBlur核心运算和imwrite的执行时间